From 22a0392f668d18784ce6b1b0bd6d65216ced2eea Mon Sep 17 00:00:00 2001
From: Yan Wong <yan.wong@bdi.ox.ac.uk>
Date: Fri, 6 Jun 2025 14:27:19 +0100
Subject: [PATCH] Add an edge ID

Only 3 lines in drawing.py, and a single test.

The rest of the churn is the pre-saved SVGs, sorry
---
 python/CHANGELOG.rst                          |   3 +
 python/tests/data/svg/internal_sample_ts.svg  |  84 +++++++-------
 python/tests/data/svg/tree.svg                |  12 +-
 python/tests/data/svg/tree_both_axes.svg      |  12 +-
 python/tests/data/svg/tree_muts.svg           |  14 +--
 python/tests/data/svg/tree_muts_all_edge.svg  |  14 +--
 python/tests/data/svg/tree_poly.svg           |  82 ++++++-------
 python/tests/data/svg/tree_poly_tracked.svg   |  30 ++---
 .../data/svg/tree_poly_tracked_collapse.svg   |  24 ++--
 .../tests/data/svg/tree_simple_collapsed.svg  |  12 +-
 python/tests/data/svg/tree_subtree.svg        |  12 +-
 .../data/svg/tree_subtrees_with_collapsed.svg |  36 +++---
 python/tests/data/svg/tree_timed_muts.svg     |  14 +--
 python/tests/data/svg/tree_x_axis.svg         |  14 +--
 python/tests/data/svg/tree_y_axis_rank.svg    |  14 +--
 python/tests/data/svg/ts.svg                  |  70 ++++++------
 python/tests/data/svg/ts_max_trees.svg        | 100 ++++++++--------
 .../tests/data/svg/ts_max_trees_treewise.svg  | 100 ++++++++--------
 python/tests/data/svg/ts_multiroot.svg        | 108 +++++++++---------
 python/tests/data/svg/ts_mut_highlight.svg    |  70 ++++++------
 python/tests/data/svg/ts_mut_times.svg        |  70 ++++++------
 .../tests/data/svg/ts_mut_times_logscale.svg  |  70 ++++++------
 python/tests/data/svg/ts_mut_times_titles.svg |  70 ++++++------
 .../tests/data/svg/ts_mutations_no_edges.svg  |  20 ++--
 .../data/svg/ts_mutations_timed_no_edges.svg  |  20 ++--
 python/tests/data/svg/ts_no_axes.svg          |  70 ++++++------
 python/tests/data/svg/ts_plain.svg            |  70 ++++++------
 python/tests/data/svg/ts_plain_no_xlab.svg    |  70 ++++++------
 python/tests/data/svg/ts_plain_y.svg          |  70 ++++++------
 python/tests/data/svg/ts_rank.svg             |  70 ++++++------
 python/tests/data/svg/ts_title.svg            |  70 ++++++------
 python/tests/data/svg/ts_x_lim.svg            |  42 +++----
 python/tests/data/svg/ts_xlabel.svg           |  70 ++++++------
 python/tests/data/svg/ts_y_axis.svg           |  70 ++++++------
 python/tests/data/svg/ts_y_axis_log.svg       |  70 ++++++------
 python/tests/data/svg/ts_y_axis_regular.svg   |  70 ++++++------
 python/tests/test_drawing.py                  |  23 ++--
 python/tskit/drawing.py                       |   6 +-
 38 files changed, 930 insertions(+), 916 deletions(-)

diff --git a/python/CHANGELOG.rst b/python/CHANGELOG.rst
index f59ae5e9c5..9fc257c9d9 100644
--- a/python/CHANGELOG.rst
+++ b/python/CHANGELOG.rst
@@ -7,6 +7,9 @@
 - ``TreeSequence.map_to_vcf_model`` now also returns the transformed positions and
   contig length. (:user:`benjeffery`, :pr:`3174`, :issue:`3173`)
 
+- ``draw_svg()`` methods now associate tree branches with edge IDs
+  (:user:`hyanwong`, :pr:`3193`, :issue:`557`)
+
 **Bugfixes**
 
 - Fix bug in ``TreeSequence.pair_coalescence_counts`` when ``span_normalise=True``
diff --git a/python/tests/data/svg/internal_sample_ts.svg b/python/tests/data/svg/internal_sample_ts.svg
index 58e9185b17..6ede5185bd 100644
--- a/python/tests/data/svg/internal_sample_ts.svg
+++ b/python/tests/data/svg/internal_sample_ts.svg
@@ -102,31 +102,31 @@
 					<g class="c2 m0 m1 node n9 root s0" transform="translate(70.6667 22.3778)">
 						<g class="a9 c2 node n4" transform="translate(-25.3333 97.7739)">
 							<g class="a4 leaf node n0" transform="translate(-12.6667 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H 12.6667"/>
+								<path class="edge e0" d="M 0 0 V -1.24828 H 12.6667"/>
 								<circle class="sym" cx="0" cy="0" r="3"/>
 								<text class="lab" transform="translate(0 11)">0</text>
 							</g>
 							<g class="a4 leaf node n1" transform="translate(12.6667 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H -12.6667"/>
+								<path class="edge e1" d="M 0 0 V -1.24828 H -12.6667"/>
 								<circle class="sym" cx="0" cy="0" r="3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
-							<path class="edge" d="M 0 0 V -97.7739 H 25.3333"/>
+							<path class="edge e12" d="M 0 0 V -97.7739 H 25.3333"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab lft" transform="translate(-3 -7)">4</text>
 						</g>
 						<g class="a9 c2 m2 node n5 s0" transform="translate(25.3333 86.9138)">
 							<g class="a5 leaf node n2 sample" transform="translate(-12.6667 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H 12.6667"/>
+								<path class="edge e2" d="M 0 0 V -12.1084 H 12.6667"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">2</text>
 							</g>
 							<g class="a5 leaf node n3 sample" transform="translate(12.6667 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H -12.6667"/>
+								<path class="edge e3" d="M 0 0 V -12.1084 H -12.6667"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">3</text>
 							</g>
-							<path class="edge" d="M 0 0 V -86.9138 H -25.3333"/>
+							<path class="edge e13" d="M 0 0 V -86.9138 H -25.3333"/>
 							<g class="mut m2 s0 unknown_time" transform="translate(0 -43.4569)">
 								<line x1="0" x2="0" y1="0" y2="43.4569"/>
 								<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -135,7 +135,7 @@
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab rgt" transform="translate(3 -7)">5</text>
 						</g>
-						<path class="edge" d="M 0 0 V -12.3778 H 0"/>
+						<path class="edge root" d="M 0 0 V -12.3778 H 0"/>
 						<g class="mut m0 s0 unknown_time" transform="translate(0 -8.25185)">
 							<line x1="0" x2="0" y1="0" y2="8.25185"/>
 							<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -150,12 +150,12 @@
 						<text class="lab rgt" transform="translate(3 -7)">9</text>
 					</g>
 					<g class="leaf node n7 root sample" transform="translate(134 63.504)">
-						<path class="edge" d="M 0 0 V -12.3778 H 0"/>
+						<path class="edge root" d="M 0 0 V -12.3778 H 0"/>
 						<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 						<text class="lab" transform="translate(0 11)">7</text>
 					</g>
 					<g class="leaf node n8 root sample" transform="translate(159.333 49.7389)">
-						<path class="edge" d="M 0 0 V -12.3778 H 0"/>
+						<path class="edge root" d="M 0 0 V -12.3778 H 0"/>
 						<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 						<text class="lab" transform="translate(0 11)">8</text>
 					</g>
@@ -166,16 +166,16 @@
 					<g class="c2 m5 node n7 root s2 sample" transform="translate(80.8 63.504)">
 						<g class="a7 c2 m3 m4 node n4 s1" transform="translate(-30.4 56.6478)">
 							<g class="a4 leaf node n0" transform="translate(-15.2 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H 15.2"/>
+								<path class="edge e0" d="M 0 0 V -1.24828 H 15.2"/>
 								<circle class="sym" cx="0" cy="0" r="3"/>
 								<text class="lab" transform="translate(0 11)">0</text>
 							</g>
 							<g class="a4 leaf node n1" transform="translate(15.2 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H -15.2"/>
+								<path class="edge e1" d="M 0 0 V -1.24828 H -15.2"/>
 								<circle class="sym" cx="0" cy="0" r="3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
-							<path class="edge" d="M 0 0 V -56.6478 H 30.4"/>
+							<path class="edge e6" d="M 0 0 V -56.6478 H 30.4"/>
 							<g class="mut m3 s1 unknown_time" transform="translate(0 -37.7652)">
 								<line x1="0" x2="0" y1="0" y2="37.7652"/>
 								<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -191,12 +191,12 @@
 						</g>
 						<g class="a7 c2 node n5" transform="translate(30.4 45.7876)">
 							<g class="a5 leaf node n2 sample" transform="translate(-15.2 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H 15.2"/>
+								<path class="edge e2" d="M 0 0 V -12.1084 H 15.2"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">2</text>
 							</g>
 							<g class="a5 leaf m6 node n3 s2 sample" transform="translate(15.2 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H -15.2"/>
+								<path class="edge e3" d="M 0 0 V -12.1084 H -15.2"/>
 								<g class="mut m6 s2 unknown_time" transform="translate(0 -6.05422)">
 									<line x1="0" x2="0" y1="0" y2="6.05422"/>
 									<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -205,11 +205,11 @@
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">3</text>
 							</g>
-							<path class="edge" d="M 0 0 V -45.7876 H -30.4"/>
+							<path class="edge e8" d="M 0 0 V -45.7876 H -30.4"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab rgt" transform="translate(3 -7)">5</text>
 						</g>
-						<path class="edge" d="M 0 0 V -12.3778 H 0"/>
+						<path class="edge root" d="M 0 0 V -12.3778 H 0"/>
 						<g class="mut m5 s2 unknown_time" transform="translate(0 -6.18889)">
 							<line x1="0" x2="0" y1="0" y2="6.18889"/>
 							<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -219,7 +219,7 @@
 						<text class="lab rgt" transform="translate(3 -7)">7</text>
 					</g>
 					<g class="leaf node n8 root sample" transform="translate(156.8 49.7389)">
-						<path class="edge" d="M 0 0 V -12.3778 H 0"/>
+						<path class="edge root" d="M 0 0 V -12.3778 H 0"/>
 						<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 						<text class="lab" transform="translate(0 11)">8</text>
 					</g>
@@ -230,45 +230,45 @@
 					<g class="c2 node n6 root" transform="translate(70.6667 102.321)">
 						<g class="a6 c2 node n4" transform="translate(-25.3333 17.8305)">
 							<g class="a4 leaf node n0" transform="translate(-12.6667 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H 12.6667"/>
+								<path class="edge e0" d="M 0 0 V -1.24828 H 12.6667"/>
 								<circle class="sym" cx="0" cy="0" r="3"/>
 								<text class="lab" transform="translate(0 11)">0</text>
 							</g>
 							<g class="a4 leaf node n1" transform="translate(12.6667 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H -12.6667"/>
+								<path class="edge e1" d="M 0 0 V -1.24828 H -12.6667"/>
 								<circle class="sym" cx="0" cy="0" r="3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
-							<path class="edge" d="M 0 0 V -17.8305 H 25.3333"/>
+							<path class="edge e4" d="M 0 0 V -17.8305 H 25.3333"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab lft" transform="translate(-3 -7)">4</text>
 						</g>
 						<g class="a6 c2 node n5" transform="translate(25.3333 6.97033)">
 							<g class="a5 leaf node n2 sample" transform="translate(-12.6667 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H 12.6667"/>
+								<path class="edge e2" d="M 0 0 V -12.1084 H 12.6667"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">2</text>
 							</g>
 							<g class="a5 leaf node n3 sample" transform="translate(12.6667 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H -12.6667"/>
+								<path class="edge e3" d="M 0 0 V -12.1084 H -12.6667"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">3</text>
 							</g>
-							<path class="edge" d="M 0 0 V -6.97033 H -25.3333"/>
+							<path class="edge e5" d="M 0 0 V -6.97033 H -25.3333"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab rgt" transform="translate(3 -7)">5</text>
 						</g>
-						<path class="edge" d="M 0 0 V -12.3778 H 0"/>
+						<path class="edge root" d="M 0 0 V -12.3778 H 0"/>
 						<circle class="sym" cx="0" cy="0" r="3"/>
 						<text class="lab rgt" transform="translate(3 -7)">6</text>
 					</g>
 					<g class="leaf node n7 root sample" transform="translate(134 63.504)">
-						<path class="edge" d="M 0 0 V -12.3778 H 0"/>
+						<path class="edge root" d="M 0 0 V -12.3778 H 0"/>
 						<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 						<text class="lab" transform="translate(0 11)">7</text>
 					</g>
 					<g class="leaf node n8 root sample" transform="translate(159.333 49.7389)">
-						<path class="edge" d="M 0 0 V -12.3778 H 0"/>
+						<path class="edge root" d="M 0 0 V -12.3778 H 0"/>
 						<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 						<text class="lab" transform="translate(0 11)">8</text>
 					</g>
@@ -279,27 +279,27 @@
 					<g class="c2 node n7 root sample" transform="translate(80.8 63.504)">
 						<g class="a7 c2 node n4" transform="translate(-30.4 56.6478)">
 							<g class="a4 leaf node n0" transform="translate(-15.2 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H 15.2"/>
+								<path class="edge e0" d="M 0 0 V -1.24828 H 15.2"/>
 								<circle class="sym" cx="0" cy="0" r="3"/>
 								<text class="lab" transform="translate(0 11)">0</text>
 							</g>
 							<g class="a4 leaf node n1" transform="translate(15.2 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H -15.2"/>
+								<path class="edge e1" d="M 0 0 V -1.24828 H -15.2"/>
 								<circle class="sym" cx="0" cy="0" r="3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
-							<path class="edge" d="M 0 0 V -56.6478 H 30.4"/>
+							<path class="edge e7" d="M 0 0 V -56.6478 H 30.4"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab lft" transform="translate(-3 -7)">4</text>
 						</g>
 						<g class="a7 c2 node n5" transform="translate(30.4 45.7876)">
 							<g class="a5 leaf node n2 sample" transform="translate(-15.2 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H 15.2"/>
+								<path class="edge e2" d="M 0 0 V -12.1084 H 15.2"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">2</text>
 							</g>
 							<g class="a5 leaf m7 node n3 s4 sample" transform="translate(15.2 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H -15.2"/>
+								<path class="edge e3" d="M 0 0 V -12.1084 H -15.2"/>
 								<g class="mut m7 s4 unknown_time" transform="translate(0 -6.05422)">
 									<line x1="0" x2="0" y1="0" y2="6.05422"/>
 									<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -308,16 +308,16 @@
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">3</text>
 							</g>
-							<path class="edge" d="M 0 0 V -45.7876 H -30.4"/>
+							<path class="edge e9" d="M 0 0 V -45.7876 H -30.4"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab rgt" transform="translate(3 -7)">5</text>
 						</g>
-						<path class="edge" d="M 0 0 V -12.3778 H 0"/>
+						<path class="edge root" d="M 0 0 V -12.3778 H 0"/>
 						<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 						<text class="lab rgt" transform="translate(3 -7)">7</text>
 					</g>
 					<g class="leaf node n8 root sample" transform="translate(156.8 49.7389)">
-						<path class="edge" d="M 0 0 V -12.3778 H 0"/>
+						<path class="edge root" d="M 0 0 V -12.3778 H 0"/>
 						<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 						<text class="lab" transform="translate(0 11)">8</text>
 					</g>
@@ -328,40 +328,40 @@
 					<g class="c2 node n8 root sample" transform="translate(80.8 49.7389)">
 						<g class="a8 c2 node n4" transform="translate(-30.4 70.4129)">
 							<g class="a4 leaf node n0" transform="translate(-15.2 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H 15.2"/>
+								<path class="edge e0" d="M 0 0 V -1.24828 H 15.2"/>
 								<circle class="sym" cx="0" cy="0" r="3"/>
 								<text class="lab" transform="translate(0 11)">0</text>
 							</g>
 							<g class="a4 leaf node n1" transform="translate(15.2 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H -15.2"/>
+								<path class="edge e1" d="M 0 0 V -1.24828 H -15.2"/>
 								<circle class="sym" cx="0" cy="0" r="3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
-							<path class="edge" d="M 0 0 V -70.4129 H 30.4"/>
+							<path class="edge e10" d="M 0 0 V -70.4129 H 30.4"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab lft" transform="translate(-3 -7)">4</text>
 						</g>
 						<g class="a8 c2 node n5" transform="translate(30.4 59.5527)">
 							<g class="a5 leaf node n2 sample" transform="translate(-15.2 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H 15.2"/>
+								<path class="edge e2" d="M 0 0 V -12.1084 H 15.2"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">2</text>
 							</g>
 							<g class="a5 leaf node n3 sample" transform="translate(15.2 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H -15.2"/>
+								<path class="edge e3" d="M 0 0 V -12.1084 H -15.2"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">3</text>
 							</g>
-							<path class="edge" d="M 0 0 V -59.5527 H -30.4"/>
+							<path class="edge e11" d="M 0 0 V -59.5527 H -30.4"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab rgt" transform="translate(3 -7)">5</text>
 						</g>
-						<path class="edge" d="M 0 0 V -12.3778 H 0"/>
+						<path class="edge root" d="M 0 0 V -12.3778 H 0"/>
 						<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 						<text class="lab rgt" transform="translate(3 -7)">8</text>
 					</g>
 					<g class="leaf node n7 root sample" transform="translate(156.8 63.504)">
-						<path class="edge" d="M 0 0 V -12.3778 H 0"/>
+						<path class="edge root" d="M 0 0 V -12.3778 H 0"/>
 						<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 						<text class="lab" transform="translate(0 11)">7</text>
 					</g>
diff --git a/python/tests/data/svg/tree.svg b/python/tests/data/svg/tree.svg
index 1eae56aa85..e79f418018 100644
--- a/python/tests/data/svg/tree.svg
+++ b/python/tests/data/svg/tree.svg
@@ -8,31 +8,31 @@
 			<g class="c2 node n8 p0 root" transform="translate(100 26.8)">
 				<g class="a8 c2 node n4 p0" transform="translate(-40 138.937)">
 					<g class="a4 leaf node n0 p0 sample" transform="translate(-20 2.46307)">
-						<path class="edge" d="M 0 0 V -2.46307 H 20"/>
+						<path class="edge e0" d="M 0 0 V -2.46307 H 20"/>
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+						<path class="edge e1" d="M 0 0 V -2.46307 H -20"/>
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 					<g class="a5 leaf node n2 p0 sample" transform="translate(-20 23.8921)">
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+						<path class="edge e2" d="M 0 0 V -23.8921 H 20"/>
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+						<path class="edge e3" d="M 0 0 V -23.8921 H -20"/>
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-					<path class="edge" d="M 0 0 V -117.508 H -40"/>
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diff --git a/python/tests/data/svg/tree_both_axes.svg b/python/tests/data/svg/tree_both_axes.svg
index 863bdf09b8..d53912372f 100644
--- a/python/tests/data/svg/tree_both_axes.svg
+++ b/python/tests/data/svg/tree_both_axes.svg
@@ -62,31 +62,31 @@
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 					<g class="a4 leaf node n0 p0 sample" transform="translate(-15.4 1.82204)">
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+						<path class="edge e0" d="M 0 0 V -1.82204 H 15.4"/>
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 					<g class="a4 leaf node n1 p0 sample" transform="translate(15.4 1.82204)">
-						<path class="edge" d="M 0 0 V -1.82204 H -15.4"/>
+						<path class="edge e1" d="M 0 0 V -1.82204 H -15.4"/>
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 						<text class="lab" transform="translate(0 11)">1</text>
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-					<path class="edge" d="M 0 0 V -102.778 H 30.8"/>
+					<path class="edge e10" d="M 0 0 V -102.778 H 30.8"/>
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 					<g class="a5 leaf node n2 p0 sample" transform="translate(-15.4 17.6741)">
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+						<path class="edge e2" d="M 0 0 V -17.6741 H 15.4"/>
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+						<path class="edge e3" d="M 0 0 V -17.6741 H -15.4"/>
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-					<path class="edge" d="M 0 0 V -86.9259 H -30.8"/>
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diff --git a/python/tests/data/svg/tree_muts.svg b/python/tests/data/svg/tree_muts.svg
index 1651e84776..4c927ade8a 100644
--- a/python/tests/data/svg/tree_muts.svg
+++ b/python/tests/data/svg/tree_muts.svg
@@ -8,31 +8,31 @@
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 					<g class="a4 leaf node n0 p0 sample" transform="translate(-20 1.77269)">
-						<path class="edge" d="M 0 0 V -1.77269 H 20"/>
+						<path class="edge e0" d="M 0 0 V -1.77269 H 20"/>
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 					<g class="a4 leaf node n1 p0 sample" transform="translate(20 1.77269)">
-						<path class="edge" d="M 0 0 V -1.77269 H -20"/>
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 						<text class="lab" transform="translate(0 11)">1</text>
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-					<path class="edge" d="M 0 0 V -138.85 H 40"/>
+					<path class="edge e12" d="M 0 0 V -138.85 H 40"/>
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 					<g class="a5 leaf node n2 p0 sample" transform="translate(-20 17.1953)">
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 					<g class="a5 leaf node n3 p0 sample" transform="translate(20 17.1953)">
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 						<text class="lab" transform="translate(0 11)">3</text>
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-					<path class="edge" d="M 0 0 V -123.427 H -40"/>
+					<path class="edge e13" d="M 0 0 V -123.427 H -40"/>
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@@ -41,7 +41,7 @@
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 					<text class="lab rgt" transform="translate(3 -7)">5</text>
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-				<path class="edge" d="M 0 0 V -17.5778 H 0"/>
+				<path class="edge root" d="M 0 0 V -17.5778 H 0"/>
 				<g class="mut m0 s0 unknown_time" transform="translate(0 -11.7185)">
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diff --git a/python/tests/data/svg/tree_muts_all_edge.svg b/python/tests/data/svg/tree_muts_all_edge.svg
index a45bc96e7b..f80df52443 100644
--- a/python/tests/data/svg/tree_muts_all_edge.svg
+++ b/python/tests/data/svg/tree_muts_all_edge.svg
@@ -60,16 +60,16 @@
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 					<g class="a4 leaf node n0 p0 sample" transform="translate(-32.5 5.83766)">
-						<path class="edge" d="M 0 0 V -5.83766 H 32.5"/>
+						<path class="edge e0" d="M 0 0 V -5.83766 H 32.5"/>
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 					<g class="a4 leaf node n1 p0 sample" transform="translate(32.5 5.83766)">
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-					<path class="edge" d="M 0 0 V -264.918 H 65"/>
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@@ -85,12 +85,12 @@
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 					<g class="a5 leaf node n2 p0 sample" transform="translate(-32.5 56.6261)">
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+						<path class="edge e2" d="M 0 0 V -56.6261 H 32.5"/>
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@@ -104,11 +104,11 @@
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+				<path class="edge root" d="M 0 0 V -33.8444 H 0"/>
 				<g class="mut m5 s2 unknown_time" transform="translate(0 -16.9222)">
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diff --git a/python/tests/data/svg/tree_poly.svg b/python/tests/data/svg/tree_poly.svg
index f1997c8b5b..af2eefd717 100644
--- a/python/tests/data/svg/tree_poly.svg
+++ b/python/tests/data/svg/tree_poly.svg
@@ -8,206 +8,206 @@
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+						<path class="edge e21" d="M 0 0 V -94.2667 H 42"/>
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 					<g class="a31 leaf node n1 sample" transform="translate(-23.3333 94.2667)">
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 					<g class="a31 leaf node n2 sample" transform="translate(-4.66667 94.2667)">
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+						<path class="edge e23" d="M 0 0 V -94.2667 H 4.66667"/>
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 						<g class="a30 leaf node n3 sample" transform="translate(-28 47.1333)">
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-							<path class="edge" d="M 0 0 V -47.1333 H -18.6667"/>
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 							<text class="lab" transform="translate(0 11)">29</text>
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-						<path class="edge" d="M 0 0 V -47.1333 H -60.6667"/>
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diff --git a/python/tests/data/svg/tree_poly_tracked.svg b/python/tests/data/svg/tree_poly_tracked.svg
index fdf6b8712c..69563b56d8 100644
--- a/python/tests/data/svg/tree_poly_tracked.svg
+++ b/python/tests/data/svg/tree_poly_tracked.svg
@@ -9,7 +9,7 @@
 				<g class="a41 c4 node n35" transform="translate(45.1559 47.1333)">
 					<g class="a35 c4 node n34" transform="translate(-48.8646 47.1333)">
 						<g class="a34 leaf node n20 sample" transform="translate(-18.8041 47.1333)">
-							<path class="edge" d="M 0 0 V -47.1333 H 18.8041"/>
+							<path class="edge e11" d="M 0 0 V -47.1333 H 18.8041"/>
 							<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 							<text class="lab" transform="translate(0 11)">20</text>
 						</g>
@@ -20,7 +20,7 @@
 								<title>This polytomy has 3 additional branches, leading to a total of 3 descendant samples</title>
 							</text>
 						</g>
-						<path class="edge" d="M 0 0 V -47.1333 H 48.8646"/>
+						<path class="edge e32" d="M 0 0 V -47.1333 H 48.8646"/>
 						<circle class="sym" cx="0" cy="0" r="3"/>
 						<text class="lab rgt" transform="translate(3 -7)">34</text>
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@@ -31,13 +31,13 @@
 							<title>This polytomy has 3 additional branches, leading to a total of 3 descendant samples</title>
 						</text>
 					</g>
-					<path class="edge" d="M 0 0 V -47.1333 H -45.1559"/>
+					<path class="edge e39" d="M 0 0 V -47.1333 H -45.1559"/>
 					<circle class="sym" cx="0" cy="0" r="3"/>
 					<text class="lab rgt" transform="translate(3 -7)">35</text>
 				</g>
 				<g class="a41 c4 node n40" transform="translate(-172.946 47.1333)">
 					<g class="a40 c2 node n36" transform="translate(112.825 47.1333)">
-						<path class="edge" d="M 0 0 V -47.1333 H -112.825"/>
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 						<polygon class="sym multi" points="3.0,0 6,6 -6,6 -3.0,0"/>
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@@ -48,55 +48,55 @@
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 						<g class="a37 leaf node n23 sample" transform="translate(18.8041 47.1333)">
-							<path class="edge" d="M 0 0 V -47.1333 H -18.8041"/>
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 							<text class="lab" transform="translate(0 11)">23</text>
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 						<g class="a37 leaf node n24 sample" transform="translate(-18.8041 47.1333)">
-							<path class="edge" d="M 0 0 V -47.1333 H 18.8041"/>
+							<path class="edge e15" d="M 0 0 V -47.1333 H 18.8041"/>
 							<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 							<text class="lab" transform="translate(0 11)">24</text>
 						</g>
-						<path class="edge" d="M 0 0 V -47.1333 H 18.8041"/>
+						<path class="edge e34" d="M 0 0 V -47.1333 H 18.8041"/>
 						<circle class="sym" cx="0" cy="0" r="3"/>
 						<text class="lab rgt" transform="translate(3 -7)">37</text>
 					</g>
 					<g class="a40 c2 node n38" transform="translate(56.4123 47.1333)">
 						<g class="a38 leaf node n25 sample" transform="translate(-18.8041 47.1333)">
-							<path class="edge" d="M 0 0 V -47.1333 H 18.8041"/>
+							<path class="edge e16" d="M 0 0 V -47.1333 H 18.8041"/>
 							<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 							<text class="lab" transform="translate(0 11)">25</text>
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 						<g class="a38 leaf node n26 sample" transform="translate(18.8041 47.1333)">
-							<path class="edge" d="M 0 0 V -47.1333 H -18.8041"/>
+							<path class="edge e17" d="M 0 0 V -47.1333 H -18.8041"/>
 							<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 							<text class="lab" transform="translate(0 11)">26</text>
 						</g>
-						<path class="edge" d="M 0 0 V -47.1333 H -56.4123"/>
+						<path class="edge e35" d="M 0 0 V -47.1333 H -56.4123"/>
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 						<text class="lab rgt" transform="translate(3 -7)">38</text>
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 						<g class="a39 leaf node n27 sample" transform="translate(-37.6082 47.1333)">
-							<path class="edge" d="M 0 0 V -47.1333 H 37.6082"/>
+							<path class="edge e18" d="M 0 0 V -47.1333 H 37.6082"/>
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 							<text class="lab" transform="translate(0 11)">27</text>
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 						<g class="a39 leaf node n28 sample" transform="translate(0.0 47.1333)">
-							<path class="edge" d="M 0 0 V -47.1333 H 0.0"/>
+							<path class="edge e19" d="M 0 0 V -47.1333 H 0.0"/>
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 							<text class="lab" transform="translate(0 11)">28</text>
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 						<g class="a39 leaf node n29 sample" transform="translate(37.6082 47.1333)">
-							<path class="edge" d="M 0 0 V -47.1333 H -37.6082"/>
+							<path class="edge e20" d="M 0 0 V -47.1333 H -37.6082"/>
 							<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 							<text class="lab" transform="translate(0 11)">29</text>
 						</g>
-						<path class="edge" d="M 0 0 V -47.1333 H 112.825"/>
+						<path class="edge e36" d="M 0 0 V -47.1333 H 112.825"/>
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 						<text class="lab rgt" transform="translate(3 -7)">39</text>
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-					<path class="edge" d="M 0 0 V -47.1333 H 172.946"/>
+					<path class="edge e40" d="M 0 0 V -47.1333 H 172.946"/>
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diff --git a/python/tests/data/svg/tree_poly_tracked_collapse.svg b/python/tests/data/svg/tree_poly_tracked_collapse.svg
index 895daa2ac1..1e2e170187 100644
--- a/python/tests/data/svg/tree_poly_tracked_collapse.svg
+++ b/python/tests/data/svg/tree_poly_tracked_collapse.svg
@@ -9,7 +9,7 @@
 				<g class="a41 c4 node n35" transform="translate(41.3013 47.1333)">
 					<g class="a35 c4 node n34" transform="translate(-56.4461 47.1333)">
 						<g class="a34 leaf node n20 sample" transform="translate(-21.7216 47.1333)">
-							<path class="edge" d="M 0 0 V -47.1333 H 21.7216"/>
+							<path class="edge e11" d="M 0 0 V -47.1333 H 21.7216"/>
 							<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 							<text class="lab" transform="translate(0 11)">20</text>
 						</g>
@@ -20,7 +20,7 @@
 								<title>This polytomy has 3 additional branches, leading to a total of 3 descendant samples</title>
 							</text>
 						</g>
-						<path class="edge" d="M 0 0 V -47.1333 H 56.4461"/>
+						<path class="edge e32" d="M 0 0 V -47.1333 H 56.4461"/>
 						<circle class="sym" cx="0" cy="0" r="3"/>
 						<text class="lab rgt" transform="translate(3 -7)">34</text>
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@@ -31,13 +31,13 @@
 							<title>This polytomy has 3 additional branches, leading to a total of 3 descendant samples</title>
 						</text>
 					</g>
-					<path class="edge" d="M 0 0 V -47.1333 H -41.3013"/>
+					<path class="edge e39" d="M 0 0 V -47.1333 H -41.3013"/>
 					<circle class="sym" cx="0" cy="0" r="3"/>
 					<text class="lab rgt" transform="translate(3 -7)">35</text>
 				</g>
 				<g class="a41 c4 node n40" transform="translate(-188.918 47.1333)">
 					<g class="a40 c2 node n36" transform="translate(108.608 47.1333)">
-						<path class="edge" d="M 0 0 V -47.1333 H -108.608"/>
+						<path class="edge e33" d="M 0 0 V -47.1333 H -108.608"/>
 						<circle class="sym" cx="0" cy="0" r="3"/>
 						<polygon class="sym multi" points="3.0,0 6,6 -6,6 -3.0,0"/>
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@@ -48,36 +48,36 @@
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 					<g class="a40 c2 node n37" transform="translate(-43.4433 47.1333)">
 						<g class="a37 leaf node n23 sample" transform="translate(21.7216 47.1333)">
-							<path class="edge" d="M 0 0 V -47.1333 H -21.7216"/>
+							<path class="edge e14" d="M 0 0 V -47.1333 H -21.7216"/>
 							<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 							<text class="lab" transform="translate(0 11)">23</text>
 						</g>
 						<g class="a37 leaf node n24 sample" transform="translate(-21.7216 47.1333)">
-							<path class="edge" d="M 0 0 V -47.1333 H 21.7216"/>
+							<path class="edge e15" d="M 0 0 V -47.1333 H 21.7216"/>
 							<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 							<text class="lab" transform="translate(0 11)">24</text>
 						</g>
-						<path class="edge" d="M 0 0 V -47.1333 H 43.4433"/>
+						<path class="edge e34" d="M 0 0 V -47.1333 H 43.4433"/>
 						<circle class="sym" cx="0" cy="0" r="3"/>
 						<text class="lab rgt" transform="translate(3 -7)">37</text>
 					</g>
 					<g class="a40 c2 node n38" transform="translate(43.4433 47.1333)">
 						<g class="a38 leaf node n25 sample" transform="translate(-21.7216 47.1333)">
-							<path class="edge" d="M 0 0 V -47.1333 H 21.7216"/>
+							<path class="edge e16" d="M 0 0 V -47.1333 H 21.7216"/>
 							<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 							<text class="lab" transform="translate(0 11)">25</text>
 						</g>
 						<g class="a38 leaf node n26 sample" transform="translate(21.7216 47.1333)">
-							<path class="edge" d="M 0 0 V -47.1333 H -21.7216"/>
+							<path class="edge e17" d="M 0 0 V -47.1333 H -21.7216"/>
 							<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 							<text class="lab" transform="translate(0 11)">26</text>
 						</g>
-						<path class="edge" d="M 0 0 V -47.1333 H -43.4433"/>
+						<path class="edge e35" d="M 0 0 V -47.1333 H -43.4433"/>
 						<circle class="sym" cx="0" cy="0" r="3"/>
 						<text class="lab rgt" transform="translate(3 -7)">38</text>
 					</g>
 					<g class="a40 c3 node n39" transform="translate(-108.608 47.1333)">
-						<path class="edge" d="M 0 0 V -47.1333 H 108.608"/>
+						<path class="edge e36" d="M 0 0 V -47.1333 H 108.608"/>
 						<circle class="sym" cx="0" cy="0" r="3"/>
 						<polygon class="sym multi" points="3.0,0 6,6 -6,6 -3.0,0"/>
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@@ -86,7 +86,7 @@
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 						<text class="lab rgt" transform="translate(3 -7)">39</text>
 					</g>
-					<path class="edge" d="M 0 0 V -47.1333 H 188.918"/>
+					<path class="edge e40" d="M 0 0 V -47.1333 H 188.918"/>
 					<circle class="sym" cx="0" cy="0" r="3"/>
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diff --git a/python/tests/data/svg/tree_simple_collapsed.svg b/python/tests/data/svg/tree_simple_collapsed.svg
index 7bc5d31f7f..4928838fdc 100644
--- a/python/tests/data/svg/tree_simple_collapsed.svg
+++ b/python/tests/data/svg/tree_simple_collapsed.svg
@@ -8,7 +8,7 @@
 			<g class="c2 node n14 root" transform="translate(115 26.8)">
 				<g class="a14 c2 node n10" transform="translate(-45 47.1333)">
 					<g class="a10 c2 node n8" transform="translate(-30 47.1333)">
-						<path class="edge" d="M 0 0 V -47.1333 H 30"/>
+						<path class="edge e8" d="M 0 0 V -47.1333 H 30"/>
 						<circle class="sym" cx="0" cy="0" r="3"/>
 						<polygon class="sym multi" points="3.0,0 6,6 -6,6 -3.0,0"/>
 						<text class="lab summary" font-style="italic" transform="translate(0 12)">
@@ -19,25 +19,25 @@
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 					<g class="a10 c2 node n9" transform="translate(30 47.1333)">
 						<g class="a9 leaf node n2 sample" transform="translate(-20 47.1333)">
-							<path class="edge" d="M 0 0 V -47.1333 H 20"/>
+							<path class="edge e2" d="M 0 0 V -47.1333 H 20"/>
 							<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 							<text class="lab" transform="translate(0 11)">2</text>
 						</g>
 						<g class="a9 leaf node n3 sample" transform="translate(20 47.1333)">
-							<path class="edge" d="M 0 0 V -47.1333 H -20"/>
+							<path class="edge e3" d="M 0 0 V -47.1333 H -20"/>
 							<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 							<text class="lab" transform="translate(0 11)">3</text>
 						</g>
-						<path class="edge" d="M 0 0 V -47.1333 H -30"/>
+						<path class="edge e9" d="M 0 0 V -47.1333 H -30"/>
 						<circle class="sym" cx="0" cy="0" r="3"/>
 						<text class="lab rgt" transform="translate(3 -7)">9</text>
 					</g>
-					<path class="edge" d="M 0 0 V -47.1333 H 45"/>
+					<path class="edge e12" d="M 0 0 V -47.1333 H 45"/>
 					<circle class="sym" cx="0" cy="0" r="3"/>
 					<text class="lab lft" transform="translate(-3 -7)">10</text>
 				</g>
 				<g class="a14 c2 node n13" transform="translate(45 47.1333)">
-					<path class="edge" d="M 0 0 V -47.1333 H -45"/>
+					<path class="edge e13" d="M 0 0 V -47.1333 H -45"/>
 					<circle class="sym" cx="0" cy="0" r="3"/>
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diff --git a/python/tests/data/svg/tree_subtree.svg b/python/tests/data/svg/tree_subtree.svg
index 593b7a1c64..ae41bd36dc 100644
--- a/python/tests/data/svg/tree_subtree.svg
+++ b/python/tests/data/svg/tree_subtree.svg
@@ -8,31 +8,31 @@
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 				<g class="a10 c2 node n8" transform="translate(-40 70.7)">
 					<g class="a8 leaf node n0 sample" transform="translate(-20 70.7)">
-						<path class="edge" d="M 0 0 V -70.7 H 20"/>
+						<path class="edge e0" d="M 0 0 V -70.7 H 20"/>
 						<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 						<text class="lab" transform="translate(0 11)">0</text>
 					</g>
 					<g class="a8 leaf node n1 sample" transform="translate(20 70.7)">
-						<path class="edge" d="M 0 0 V -70.7 H -20"/>
+						<path class="edge e1" d="M 0 0 V -70.7 H -20"/>
 						<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 						<text class="lab" transform="translate(0 11)">1</text>
 					</g>
-					<path class="edge" d="M 0 0 V -70.7 H 40"/>
+					<path class="edge e8" d="M 0 0 V -70.7 H 40"/>
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 					<text class="lab lft" transform="translate(-3 -7)">8</text>
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 					<g class="a9 leaf node n2 sample" transform="translate(-20 70.7)">
-						<path class="edge" d="M 0 0 V -70.7 H 20"/>
+						<path class="edge e2" d="M 0 0 V -70.7 H 20"/>
 						<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 						<text class="lab" transform="translate(0 11)">2</text>
 					</g>
 					<g class="a9 leaf node n3 sample" transform="translate(20 70.7)">
-						<path class="edge" d="M 0 0 V -70.7 H -20"/>
+						<path class="edge e3" d="M 0 0 V -70.7 H -20"/>
 						<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 						<text class="lab" transform="translate(0 11)">3</text>
 					</g>
-					<path class="edge" d="M 0 0 V -70.7 H -40"/>
+					<path class="edge e9" d="M 0 0 V -70.7 H -40"/>
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diff --git a/python/tests/data/svg/tree_subtrees_with_collapsed.svg b/python/tests/data/svg/tree_subtrees_with_collapsed.svg
index afcae706b7..3a7415c990 100644
--- a/python/tests/data/svg/tree_subtrees_with_collapsed.svg
+++ b/python/tests/data/svg/tree_subtrees_with_collapsed.svg
@@ -8,7 +8,7 @@
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 					<g class="a18 c2 node n16" transform="translate(-10.9091 47.1333)">
-						<path class="edge" d="M 0 0 V -47.1333 H 10.9091"/>
+						<path class="edge e16" d="M 0 0 V -47.1333 H 10.9091"/>
 						<circle class="sym" cx="0" cy="0" r="3"/>
 						<polygon class="sym multi" points="3.0,0 6,6 -6,6 -3.0,0"/>
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@@ -19,55 +19,55 @@
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 						<g class="a17 leaf node n2 sample" transform="translate(-7.27273 47.1333)">
-							<path class="edge" d="M 0 0 V -47.1333 H 7.27273"/>
+							<path class="edge e2" d="M 0 0 V -47.1333 H 7.27273"/>
 							<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 							<text class="lab" transform="translate(0 11)">2</text>
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 						<g class="a17 leaf node n3 sample" transform="translate(7.27273 47.1333)">
-							<path class="edge" d="M 0 0 V -47.1333 H -7.27273"/>
+							<path class="edge e3" d="M 0 0 V -47.1333 H -7.27273"/>
 							<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 							<text class="lab" transform="translate(0 11)">3</text>
 						</g>
-						<path class="edge" d="M 0 0 V -47.1333 H -10.9091"/>
+						<path class="edge e17" d="M 0 0 V -47.1333 H -10.9091"/>
 						<circle class="sym" cx="0" cy="0" r="3"/>
 						<text class="lab rgt" transform="translate(3 -7)">17</text>
 					</g>
-					<path class="edge" d="M 0 0 V -47.1333 H 27.2727"/>
+					<path class="edge e24" d="M 0 0 V -47.1333 H 27.2727"/>
 					<circle class="sym" cx="0" cy="0" r="3"/>
 					<text class="lab lft" transform="translate(-3 -7)">18</text>
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 						<g class="a19 leaf node n4 sample" transform="translate(-7.27273 47.1333)">
-							<path class="edge" d="M 0 0 V -47.1333 H 7.27273"/>
+							<path class="edge e4" d="M 0 0 V -47.1333 H 7.27273"/>
 							<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 							<text class="lab" transform="translate(0 11)">4</text>
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 						<g class="a19 leaf node n5 sample" transform="translate(7.27273 47.1333)">
-							<path class="edge" d="M 0 0 V -47.1333 H -7.27273"/>
+							<path class="edge e5" d="M 0 0 V -47.1333 H -7.27273"/>
 							<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 							<text class="lab" transform="translate(0 11)">5</text>
 						</g>
-						<path class="edge" d="M 0 0 V -47.1333 H 14.5455"/>
+						<path class="edge e18" d="M 0 0 V -47.1333 H 14.5455"/>
 						<circle class="sym" cx="0" cy="0" r="3"/>
 						<text class="lab lft" transform="translate(-3 -7)">19</text>
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 					<g class="a21 c2 node n20" transform="translate(14.5455 47.1333)">
 						<g class="a20 leaf node n6 sample" transform="translate(-7.27273 47.1333)">
-							<path class="edge" d="M 0 0 V -47.1333 H 7.27273"/>
+							<path class="edge e6" d="M 0 0 V -47.1333 H 7.27273"/>
 							<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 							<text class="lab" transform="translate(0 11)">6</text>
 						</g>
 						<g class="a20 leaf node n7 sample" transform="translate(7.27273 47.1333)">
-							<path class="edge" d="M 0 0 V -47.1333 H -7.27273"/>
+							<path class="edge e7" d="M 0 0 V -47.1333 H -7.27273"/>
 							<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 							<text class="lab" transform="translate(0 11)">7</text>
 						</g>
-						<path class="edge" d="M 0 0 V -47.1333 H -14.5455"/>
+						<path class="edge e19" d="M 0 0 V -47.1333 H -14.5455"/>
 						<circle class="sym" cx="0" cy="0" r="3"/>
 						<text class="lab rgt" transform="translate(3 -7)">20</text>
 					</g>
-					<path class="edge" d="M 0 0 V -47.1333 H -27.2727"/>
+					<path class="edge e25" d="M 0 0 V -47.1333 H -27.2727"/>
 					<circle class="sym" cx="0" cy="0" r="3"/>
 					<text class="lab rgt" transform="translate(3 -7)">21</text>
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@@ -77,31 +77,31 @@
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 					<g class="a23 leaf node n8 sample" transform="translate(-7.27273 47.1333)">
-						<path class="edge" d="M 0 0 V -47.1333 H 7.27273"/>
+						<path class="edge e8" d="M 0 0 V -47.1333 H 7.27273"/>
 						<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 						<text class="lab" transform="translate(0 11)">8</text>
 					</g>
 					<g class="a23 leaf node n9 sample" transform="translate(7.27273 47.1333)">
-						<path class="edge" d="M 0 0 V -47.1333 H -7.27273"/>
+						<path class="edge e9" d="M 0 0 V -47.1333 H -7.27273"/>
 						<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 						<text class="lab" transform="translate(0 11)">9</text>
 					</g>
-					<path class="edge" d="M 0 0 V -47.1333 H 14.5455"/>
+					<path class="edge e20" d="M 0 0 V -47.1333 H 14.5455"/>
 					<circle class="sym" cx="0" cy="0" r="3"/>
 					<text class="lab lft" transform="translate(-3 -7)">23</text>
 				</g>
 				<g class="a25 c2 node n24" transform="translate(14.5455 47.1333)">
 					<g class="a24 leaf node n10 sample" transform="translate(-7.27273 47.1333)">
-						<path class="edge" d="M 0 0 V -47.1333 H 7.27273"/>
+						<path class="edge e10" d="M 0 0 V -47.1333 H 7.27273"/>
 						<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 						<text class="lab" transform="translate(0 11)">10</text>
 					</g>
 					<g class="a24 leaf node n11 sample" transform="translate(7.27273 47.1333)">
-						<path class="edge" d="M 0 0 V -47.1333 H -7.27273"/>
+						<path class="edge e11" d="M 0 0 V -47.1333 H -7.27273"/>
 						<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 						<text class="lab" transform="translate(0 11)">11</text>
 					</g>
-					<path class="edge" d="M 0 0 V -47.1333 H -14.5455"/>
+					<path class="edge e21" d="M 0 0 V -47.1333 H -14.5455"/>
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 					<text class="lab rgt" transform="translate(3 -7)">24</text>
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diff --git a/python/tests/data/svg/tree_timed_muts.svg b/python/tests/data/svg/tree_timed_muts.svg
index ca187728ca..c13440881a 100644
--- a/python/tests/data/svg/tree_timed_muts.svg
+++ b/python/tests/data/svg/tree_timed_muts.svg
@@ -8,31 +8,31 @@
 			<g class="c2 m0 m1 node n9 p0 root s0" transform="translate(100 72.4037)">
 				<g class="a9 c2 node n4 p0" transform="translate(-40 94.5886)">
 					<g class="a4 leaf node n0 p0 sample" transform="translate(-20 1.20761)">
-						<path class="edge" d="M 0 0 V -1.20761 H 20"/>
+						<path class="edge e0" d="M 0 0 V -1.20761 H 20"/>
 						<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 						<text class="lab" transform="translate(0 11)">0</text>
 					</g>
 					<g class="a4 leaf node n1 p0 sample" transform="translate(20 1.20761)">
-						<path class="edge" d="M 0 0 V -1.20761 H -20"/>
+						<path class="edge e1" d="M 0 0 V -1.20761 H -20"/>
 						<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 						<text class="lab" transform="translate(0 11)">1</text>
 					</g>
-					<path class="edge" d="M 0 0 V -94.5886 H 40"/>
+					<path class="edge e12" d="M 0 0 V -94.5886 H 40"/>
 					<circle class="sym" cx="0" cy="0" r="3"/>
 					<text class="lab lft" transform="translate(-3 -7)">4</text>
 				</g>
 				<g class="a9 c2 m2 node n5 p0 s0" transform="translate(40 84.0823)">
 					<g class="a5 leaf node n2 p0 sample" transform="translate(-20 11.714)">
-						<path class="edge" d="M 0 0 V -11.714 H 20"/>
+						<path class="edge e2" d="M 0 0 V -11.714 H 20"/>
 						<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 						<text class="lab" transform="translate(0 11)">2</text>
 					</g>
 					<g class="a5 leaf node n3 p0 sample" transform="translate(20 11.714)">
-						<path class="edge" d="M 0 0 V -11.714 H -20"/>
+						<path class="edge e3" d="M 0 0 V -11.714 H -20"/>
 						<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 						<text class="lab" transform="translate(0 11)">3</text>
 					</g>
-					<path class="edge" d="M 0 0 V -84.0823 H -40"/>
+					<path class="edge e13" d="M 0 0 V -84.0823 H -40"/>
 					<g class="mut m2 s0" transform="translate(0 -83.206)">
 						<line x1="0" x2="0" y1="0" y2="83.206"/>
 						<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -41,7 +41,7 @@
 					<circle class="sym" cx="0" cy="0" r="3"/>
 					<text class="lab rgt" transform="translate(3 -7)">5</text>
 				</g>
-				<path class="edge" d="M 0 0 V -62.4037 H 0"/>
+				<path class="edge root" d="M 0 0 V -62.4037 H 0"/>
 				<g class="mut m0 s0" transform="translate(0 -62.4037)">
 					<line x1="0" x2="0" y1="0" y2="62.4037"/>
 					<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
diff --git a/python/tests/data/svg/tree_x_axis.svg b/python/tests/data/svg/tree_x_axis.svg
index 3c4f2e7bd1..50aa686040 100644
--- a/python/tests/data/svg/tree_x_axis.svg
+++ b/python/tests/data/svg/tree_x_axis.svg
@@ -51,16 +51,16 @@
 			<g class="c2 m5 node n7 p0 root s2" transform="translate(200 23.4889)">
 				<g class="a7 c2 m3 m4 node n4 p0 s1" transform="translate(-90 105.584)">
 					<g class="a4 leaf node n0 p0 sample" transform="translate(-45 2.32663)">
-						<path class="edge" d="M 0 0 V -2.32663 H 45"/>
+						<path class="edge e0" d="M 0 0 V -2.32663 H 45"/>
 						<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 						<text class="lab" transform="translate(0 11)">0</text>
 					</g>
 					<g class="a4 leaf node n1 p0 sample" transform="translate(45 2.32663)">
-						<path class="edge" d="M 0 0 V -2.32663 H -45"/>
+						<path class="edge e1" d="M 0 0 V -2.32663 H -45"/>
 						<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 						<text class="lab" transform="translate(0 11)">1</text>
 					</g>
-					<path class="edge" d="M 0 0 V -105.584 H 90"/>
+					<path class="edge e6" d="M 0 0 V -105.584 H 90"/>
 					<g class="mut m3 s1 unknown_time" transform="translate(0 -70.3897)">
 						<line x1="0" x2="0" y1="0" y2="70.3897"/>
 						<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -76,12 +76,12 @@
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 				<g class="a7 c2 node n5 p0" transform="translate(90 85.3425)">
 					<g class="a5 leaf node n2 p0 sample" transform="translate(-45 22.5686)">
-						<path class="edge" d="M 0 0 V -22.5686 H 45"/>
+						<path class="edge e2" d="M 0 0 V -22.5686 H 45"/>
 						<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 						<text class="lab" transform="translate(0 11)">2</text>
 					</g>
 					<g class="a5 leaf m6 node n3 p0 s2 sample" transform="translate(45 22.5686)">
-						<path class="edge" d="M 0 0 V -22.5686 H -45"/>
+						<path class="edge e3" d="M 0 0 V -22.5686 H -45"/>
 						<g class="mut m6 s2 unknown_time" transform="translate(0 -11.2843)">
 							<line x1="0" x2="0" y1="0" y2="11.2843"/>
 							<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -90,11 +90,11 @@
 						<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 						<text class="lab" transform="translate(0 11)">3</text>
 					</g>
-					<path class="edge" d="M 0 0 V -85.3425 H -90"/>
+					<path class="edge e8" d="M 0 0 V -85.3425 H -90"/>
 					<circle class="sym" cx="0" cy="0" r="3"/>
 					<text class="lab rgt" transform="translate(3 -7)">5</text>
 				</g>
-				<path class="edge" d="M 0 0 V -13.4889 H 0"/>
+				<path class="edge root" d="M 0 0 V -13.4889 H 0"/>
 				<g class="mut m5 s2 unknown_time" transform="translate(0 -6.74444)">
 					<line x1="0" x2="0" y1="0" y2="6.74444"/>
 					<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
diff --git a/python/tests/data/svg/tree_y_axis_rank.svg b/python/tests/data/svg/tree_y_axis_rank.svg
index 79af1d5072..b6b31e7946 100644
--- a/python/tests/data/svg/tree_y_axis_rank.svg
+++ b/python/tests/data/svg/tree_y_axis_rank.svg
@@ -46,16 +46,16 @@
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 				<g class="a7 c2 m3 m4 node n4 p0 s1" transform="translate(-30.8 79.1)">
 					<g class="a4 leaf node n0 p0 sample" transform="translate(-15.4 39.55)">
-						<path class="edge" d="M 0 0 V -39.55 H 15.4"/>
+						<path class="edge e0" d="M 0 0 V -39.55 H 15.4"/>
 						<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 						<text class="lab" transform="translate(0 11)">0</text>
 					</g>
 					<g class="a4 leaf node n1 p0 sample" transform="translate(15.4 39.55)">
-						<path class="edge" d="M 0 0 V -39.55 H -15.4"/>
+						<path class="edge e1" d="M 0 0 V -39.55 H -15.4"/>
 						<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 						<text class="lab" transform="translate(0 11)">1</text>
 					</g>
-					<path class="edge" d="M 0 0 V -79.1 H 30.8"/>
+					<path class="edge e6" d="M 0 0 V -79.1 H 30.8"/>
 					<g class="mut m3 s1 unknown_time" transform="translate(0 -52.7333)">
 						<line x1="0" x2="0" y1="0" y2="52.7333"/>
 						<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -71,12 +71,12 @@
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 				<g class="a7 c2 node n5 p0" transform="translate(30.8 39.55)">
 					<g class="a5 leaf node n2 p0 sample" transform="translate(-15.4 79.1)">
-						<path class="edge" d="M 0 0 V -79.1 H 15.4"/>
+						<path class="edge e2" d="M 0 0 V -79.1 H 15.4"/>
 						<rect class="sym" height="6" width="6" x="-3" y="-3"/>
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 					<g class="a5 leaf m6 node n3 p0 s2 sample" transform="translate(15.4 79.1)">
-						<path class="edge" d="M 0 0 V -79.1 H -15.4"/>
+						<path class="edge e3" d="M 0 0 V -79.1 H -15.4"/>
 						<g class="mut m6 s2 unknown_time" transform="translate(0 -39.55)">
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 							<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -85,11 +85,11 @@
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 						<text class="lab" transform="translate(0 11)">3</text>
 					</g>
-					<path class="edge" d="M 0 0 V -39.55 H -30.8"/>
+					<path class="edge e8" d="M 0 0 V -39.55 H -30.8"/>
 					<circle class="sym" cx="0" cy="0" r="3"/>
 					<text class="lab rgt" transform="translate(3 -7)">5</text>
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-				<path class="edge" d="M 0 0 V -39.55 H 0"/>
+				<path class="edge root" d="M 0 0 V -39.55 H 0"/>
 				<g class="mut m5 s2 unknown_time" transform="translate(0 -19.775)">
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 					<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
diff --git a/python/tests/data/svg/ts.svg b/python/tests/data/svg/ts.svg
index 0323aa1c99..ceeef8cbda 100644
--- a/python/tests/data/svg/ts.svg
+++ b/python/tests/data/svg/ts.svg
@@ -102,31 +102,31 @@
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 						<g class="a9 c2 node n4 p0" transform="translate(-38 97.7739)">
 							<g class="a4 leaf node n0 p0 sample" transform="translate(-19 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H 19"/>
+								<path class="edge e0" d="M 0 0 V -1.24828 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">0</text>
 							</g>
 							<g class="a4 leaf node n1 p0 sample" transform="translate(19 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H -19"/>
+								<path class="edge e1" d="M 0 0 V -1.24828 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
-							<path class="edge" d="M 0 0 V -97.7739 H 38"/>
+							<path class="edge e12" d="M 0 0 V -97.7739 H 38"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab lft" transform="translate(-3 -7)">4</text>
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 						<g class="a9 c2 m2 node n5 p0 s0" transform="translate(38 86.9138)">
 							<g class="a5 leaf node n2 p0 sample" transform="translate(-19 12.1084)">
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+								<path class="edge e2" d="M 0 0 V -12.1084 H 19"/>
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 							<g class="a5 leaf node n3 p0 sample" transform="translate(19 12.1084)">
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+								<path class="edge e3" d="M 0 0 V -12.1084 H -19"/>
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 								<text class="lab" transform="translate(0 11)">3</text>
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-							<path class="edge" d="M 0 0 V -86.9138 H -38"/>
+							<path class="edge e13" d="M 0 0 V -86.9138 H -38"/>
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@@ -135,7 +135,7 @@
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 							<text class="lab rgt" transform="translate(3 -7)">5</text>
 						</g>
-						<path class="edge" d="M 0 0 V -12.3778 H 0"/>
+						<path class="edge root" d="M 0 0 V -12.3778 H 0"/>
 						<g class="mut m0 s0 unknown_time" transform="translate(0 -8.25185)">
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@@ -156,16 +156,16 @@
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 							<g class="a4 leaf node n0 p0 sample" transform="translate(-19 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H 19"/>
+								<path class="edge e0" d="M 0 0 V -1.24828 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">0</text>
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 							<g class="a4 leaf node n1 p0 sample" transform="translate(19 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H -19"/>
+								<path class="edge e1" d="M 0 0 V -1.24828 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
-							<path class="edge" d="M 0 0 V -56.6478 H 38"/>
+							<path class="edge e6" d="M 0 0 V -56.6478 H 38"/>
 							<g class="mut m3 s1 unknown_time" transform="translate(0 -37.7652)">
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@@ -181,12 +181,12 @@
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 							<g class="a5 leaf node n2 p0 sample" transform="translate(-19 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H 19"/>
+								<path class="edge e2" d="M 0 0 V -12.1084 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">2</text>
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 							<g class="a5 leaf m6 node n3 p0 s2 sample" transform="translate(19 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H -19"/>
+								<path class="edge e3" d="M 0 0 V -12.1084 H -19"/>
 								<g class="mut m6 s2 unknown_time" transform="translate(0 -6.05422)">
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 									<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -195,11 +195,11 @@
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 								<text class="lab" transform="translate(0 11)">3</text>
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-							<path class="edge" d="M 0 0 V -45.7876 H -38"/>
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 							<text class="lab rgt" transform="translate(3 -7)">5</text>
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-						<path class="edge" d="M 0 0 V -12.3778 H 0"/>
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 						<g class="mut m5 s2 unknown_time" transform="translate(0 -6.18889)">
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@@ -215,35 +215,35 @@
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 							<g class="a4 leaf node n0 p0 sample" transform="translate(-19 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H 19"/>
+								<path class="edge e0" d="M 0 0 V -1.24828 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">0</text>
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 							<g class="a4 leaf node n1 p0 sample" transform="translate(19 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H -19"/>
+								<path class="edge e1" d="M 0 0 V -1.24828 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
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-							<path class="edge" d="M 0 0 V -17.8305 H 38"/>
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 						<g class="a6 c2 node n5 p0" transform="translate(38 6.97033)">
 							<g class="a5 leaf node n2 p0 sample" transform="translate(-19 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H 19"/>
+								<path class="edge e2" d="M 0 0 V -12.1084 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">2</text>
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 							<g class="a5 leaf node n3 p0 sample" transform="translate(19 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H -19"/>
+								<path class="edge e3" d="M 0 0 V -12.1084 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">3</text>
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-							<path class="edge" d="M 0 0 V -6.97033 H -38"/>
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-						<path class="edge" d="M 0 0 V -12.3778 H 0"/>
+						<path class="edge root" d="M 0 0 V -12.3778 H 0"/>
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@@ -254,27 +254,27 @@
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 							<g class="a4 leaf node n0 p0 sample" transform="translate(-19 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H 19"/>
+								<path class="edge e0" d="M 0 0 V -1.24828 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">0</text>
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 							<g class="a4 leaf node n1 p0 sample" transform="translate(19 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H -19"/>
+								<path class="edge e1" d="M 0 0 V -1.24828 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
-							<path class="edge" d="M 0 0 V -56.6478 H 38"/>
+							<path class="edge e7" d="M 0 0 V -56.6478 H 38"/>
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 						<g class="a7 c2 node n5 p0" transform="translate(38 45.7876)">
 							<g class="a5 leaf node n2 p0 sample" transform="translate(-19 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H 19"/>
+								<path class="edge e2" d="M 0 0 V -12.1084 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">2</text>
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 							<g class="a5 leaf m7 node n3 p0 s4 sample" transform="translate(19 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H -19"/>
+								<path class="edge e3" d="M 0 0 V -12.1084 H -19"/>
 								<g class="mut m7 s4 unknown_time" transform="translate(0 -6.05422)">
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@@ -283,11 +283,11 @@
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 								<text class="lab" transform="translate(0 11)">3</text>
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-							<path class="edge" d="M 0 0 V -45.7876 H -38"/>
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-						<path class="edge" d="M 0 0 V -12.3778 H 0"/>
+						<path class="edge root" d="M 0 0 V -12.3778 H 0"/>
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@@ -298,35 +298,35 @@
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 							<g class="a4 leaf node n0 p0 sample" transform="translate(-19 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H 19"/>
+								<path class="edge e0" d="M 0 0 V -1.24828 H 19"/>
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 								<text class="lab" transform="translate(0 11)">0</text>
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 							<g class="a4 leaf node n1 p0 sample" transform="translate(19 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H -19"/>
+								<path class="edge e1" d="M 0 0 V -1.24828 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
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-							<path class="edge" d="M 0 0 V -70.4129 H 38"/>
+							<path class="edge e10" d="M 0 0 V -70.4129 H 38"/>
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 						<g class="a8 c2 node n5 p0" transform="translate(38 59.5527)">
 							<g class="a5 leaf node n2 p0 sample" transform="translate(-19 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H 19"/>
+								<path class="edge e2" d="M 0 0 V -12.1084 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">2</text>
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 							<g class="a5 leaf node n3 p0 sample" transform="translate(19 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H -19"/>
+								<path class="edge e3" d="M 0 0 V -12.1084 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">3</text>
 							</g>
-							<path class="edge" d="M 0 0 V -59.5527 H -38"/>
+							<path class="edge e11" d="M 0 0 V -59.5527 H -38"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab rgt" transform="translate(3 -7)">5</text>
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-						<path class="edge" d="M 0 0 V -12.3778 H 0"/>
+						<path class="edge root" d="M 0 0 V -12.3778 H 0"/>
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 						<text class="lab rgt" transform="translate(3 -7)">8</text>
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diff --git a/python/tests/data/svg/ts_max_trees.svg b/python/tests/data/svg/ts_max_trees.svg
index a012e7e778..1b47dee35d 100644
--- a/python/tests/data/svg/ts_max_trees.svg
+++ b/python/tests/data/svg/ts_max_trees.svg
@@ -140,51 +140,51 @@
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 							<g class="a11 i0 leaf node n1 p0 sample" transform="translate(-18.4 11.2544)">
-								<path class="edge" d="M 0 0 V -11.2544 H 18.4"/>
+								<path class="edge e11" d="M 0 0 V -11.2544 H 18.4"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
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 							<g class="a11 c2 node n7 p0" transform="translate(18.4 10.0352)">
 								<g class="a7 i2 leaf node n4 p0 sample" transform="translate(-12.2667 1.21924)">
-									<path class="edge" d="M 0 0 V -1.21924 H 12.2667"/>
+									<path class="edge e2" d="M 0 0 V -1.21924 H 12.2667"/>
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 								<g class="a7 i2 leaf node n5 p0 sample" transform="translate(12.2667 1.21924)">
-									<path class="edge" d="M 0 0 V -1.21924 H -12.2667"/>
+									<path class="edge e3" d="M 0 0 V -1.21924 H -12.2667"/>
 									<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 									<text class="lab" transform="translate(0 11)">5</text>
 								</g>
-								<path class="edge" d="M 0 0 V -10.0352 H -18.4"/>
+								<path class="edge e12" d="M 0 0 V -10.0352 H -18.4"/>
 								<circle class="sym" cx="0" cy="0" r="3"/>
 								<text class="lab rgt" transform="translate(3 -7)">7</text>
 							</g>
-							<path class="edge" d="M 0 0 V -37.8156 H -36.8"/>
+							<path class="edge e67" d="M 0 0 V -37.8156 H -36.8"/>
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 							<g class="a16 i0 leaf node n0 p0 sample" transform="translate(-18.4 18.4673)">
-								<path class="edge" d="M 0 0 V -18.4673 H 18.4"/>
+								<path class="edge e24" d="M 0 0 V -18.4673 H 18.4"/>
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 								<g class="a8 i1 leaf node n2 p0 sample" transform="translate(-12.2667 5.50474)">
-									<path class="edge" d="M 0 0 V -5.50474 H 12.2667"/>
+									<path class="edge e5" d="M 0 0 V -5.50474 H 12.2667"/>
 									<rect class="sym" height="6" width="6" x="-3" y="-3"/>
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 								<g class="a8 i1 leaf node n3 p0 sample" transform="translate(12.2667 5.50474)">
-									<path class="edge" d="M 0 0 V -5.50474 H -12.2667"/>
+									<path class="edge e6" d="M 0 0 V -5.50474 H -12.2667"/>
 									<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 									<text class="lab" transform="translate(0 11)">3</text>
 								</g>
-								<path class="edge" d="M 0 0 V -12.9626 H -18.4"/>
+								<path class="edge e25" d="M 0 0 V -12.9626 H -18.4"/>
 								<circle class="sym" cx="0" cy="0" r="3"/>
 								<text class="lab rgt" transform="translate(3 -7)">8</text>
 							</g>
-							<path class="edge" d="M 0 0 V -30.6026 H 36.8"/>
+							<path class="edge e68" d="M 0 0 V -30.6026 H 36.8"/>
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@@ -198,51 +198,51 @@
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 							<g class="a11 i0 leaf node n1 p0 sample" transform="translate(-18.4 11.2544)">
-								<path class="edge" d="M 0 0 V -11.2544 H 18.4"/>
+								<path class="edge e11" d="M 0 0 V -11.2544 H 18.4"/>
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 								<g class="a7 i2 leaf node n4 p0 sample" transform="translate(-12.2667 1.21924)">
-									<path class="edge" d="M 0 0 V -1.21924 H 12.2667"/>
+									<path class="edge e2" d="M 0 0 V -1.21924 H 12.2667"/>
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 								<g class="a7 i2 leaf node n5 p0 sample" transform="translate(12.2667 1.21924)">
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-								<path class="edge" d="M 0 0 V -10.0352 H -18.4"/>
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 								</g>
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@@ -256,47 +256,47 @@
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@@ -392,36 +392,36 @@
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@@ -432,16 +432,16 @@
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diff --git a/python/tests/data/svg/ts_max_trees_treewise.svg b/python/tests/data/svg/ts_max_trees_treewise.svg
index f088c89e68..f3cadfd67f 100644
--- a/python/tests/data/svg/ts_max_trees_treewise.svg
+++ b/python/tests/data/svg/ts_max_trees_treewise.svg
@@ -114,51 +114,51 @@
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@@ -172,51 +172,51 @@
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@@ -230,47 +230,47 @@
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-								<path class="edge" d="M 0 0 V -2.97724 H -18.4"/>
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-							<path class="edge" d="M 0 0 V -17.4644 H -36.8"/>
+							<path class="edge e56" d="M 0 0 V -17.4644 H -36.8"/>
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 							<g class="a16 i0 leaf node n0 p0 sample" transform="translate(-18.4 5.9307)">
-								<path class="edge" d="M 0 0 V -5.9307 H 18.4"/>
+								<path class="edge e24" d="M 0 0 V -5.9307 H 18.4"/>
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 								<g class="a8 i1 leaf node n2 p0 sample" transform="translate(-12.2667 1.49717)">
-									<path class="edge" d="M 0 0 V -1.49717 H 12.2667"/>
+									<path class="edge e5" d="M 0 0 V -1.49717 H 12.2667"/>
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 								<g class="a8 i1 leaf node n3 p0 sample" transform="translate(12.2667 1.49717)">
-									<path class="edge" d="M 0 0 V -1.49717 H -12.2667"/>
+									<path class="edge e6" d="M 0 0 V -1.49717 H -12.2667"/>
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 									<text class="lab" transform="translate(0 11)">3</text>
 								</g>
-								<path class="edge" d="M 0 0 V -4.43354 H -18.4"/>
+								<path class="edge e25" d="M 0 0 V -4.43354 H -18.4"/>
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@@ -279,7 +279,7 @@
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 								<text class="lab rgt" transform="translate(3 -7)">8</text>
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-							<path class="edge" d="M 0 0 V -14.8254 H 36.8"/>
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@@ -303,24 +303,24 @@
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-								<path class="edge" d="M 0 0 V -2.6385 H 27.6"/>
+								<path class="edge e9" d="M 0 0 V -2.6385 H 27.6"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
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 								<g class="a7 i2 leaf node n5 p0 sample" transform="translate(18.4 0.314457)">
-									<path class="edge" d="M 0 0 V -0.314457 H -18.4"/>
+									<path class="edge e3" d="M 0 0 V -0.314457 H -18.4"/>
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-										<path class="edge" d="M 0 0 V -0.0945265 H 12.2667"/>
+										<path class="edge e0" d="M 0 0 V -0.0945265 H 12.2667"/>
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 										<text class="lab" transform="translate(0 11)">1</text>
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-										<path class="edge" d="M 0 0 V -0.0945265 H -12.2667"/>
+										<path class="edge e1" d="M 0 0 V -0.0945265 H -12.2667"/>
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@@ -329,30 +329,30 @@
 										<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 										<text class="lab" transform="translate(0 11)">4</text>
 									</g>
-									<path class="edge" d="M 0 0 V -0.21993 H 18.4"/>
+									<path class="edge e4" d="M 0 0 V -0.21993 H 18.4"/>
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 									<text class="lab lft" transform="translate(-3 -7)">6</text>
 								</g>
-								<path class="edge" d="M 0 0 V -2.32404 H -27.6"/>
+								<path class="edge e10" d="M 0 0 V -2.32404 H -27.6"/>
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 								<text class="lab rgt" transform="translate(3 -7)">7</text>
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-							<path class="edge" d="M 0 0 V -40.5232 H 41.4"/>
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 							<g class="a15 i1 leaf node n2 p0 sample" transform="translate(-12.2667 5.81331)">
-								<path class="edge" d="M 0 0 V -5.81331 H 12.2667"/>
+								<path class="edge e22" d="M 0 0 V -5.81331 H 12.2667"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">2</text>
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-								<path class="edge" d="M 0 0 V -5.81331 H -12.2667"/>
+								<path class="edge e23" d="M 0 0 V -5.81331 H -12.2667"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">3</text>
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-							<path class="edge" d="M 0 0 V -37.3484 H -41.4"/>
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@@ -366,36 +366,36 @@
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 							<g class="a10 i0 leaf node n0 p0 sample" transform="translate(-27.6 2.6385)">
-								<path class="edge" d="M 0 0 V -2.6385 H 27.6"/>
+								<path class="edge e9" d="M 0 0 V -2.6385 H 27.6"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">0</text>
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 								<g class="a7 i2 leaf node n5 p0 sample" transform="translate(18.4 0.314457)">
-									<path class="edge" d="M 0 0 V -0.314457 H -18.4"/>
+									<path class="edge e3" d="M 0 0 V -0.314457 H -18.4"/>
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-										<path class="edge" d="M 0 0 V -0.0945265 H 12.2667"/>
+										<path class="edge e0" d="M 0 0 V -0.0945265 H 12.2667"/>
 										<rect class="sym" height="6" width="6" x="-3" y="-3"/>
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 									<g class="a6 i2 leaf node n4 p0 sample" transform="translate(12.2667 0.0945265)">
-										<path class="edge" d="M 0 0 V -0.0945265 H -12.2667"/>
+										<path class="edge e1" d="M 0 0 V -0.0945265 H -12.2667"/>
 										<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 										<text class="lab" transform="translate(0 11)">4</text>
 									</g>
-									<path class="edge" d="M 0 0 V -0.21993 H 18.4"/>
+									<path class="edge e4" d="M 0 0 V -0.21993 H 18.4"/>
 									<circle class="sym" cx="0" cy="0" r="3"/>
 									<text class="lab lft" transform="translate(-3 -7)">6</text>
 								</g>
-								<path class="edge" d="M 0 0 V -2.32404 H -27.6"/>
+								<path class="edge e10" d="M 0 0 V -2.32404 H -27.6"/>
 								<circle class="sym" cx="0" cy="0" r="3"/>
 								<text class="lab rgt" transform="translate(3 -7)">7</text>
 							</g>
-							<path class="edge" d="M 0 0 V -29.1254 H 41.4"/>
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 							<g class="mut m9 s9" transform="translate(0 -20.3807)">
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@@ -406,16 +406,16 @@
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 							<g class="a15 i1 leaf node n2 p0 sample" transform="translate(-12.2667 5.81331)">
-								<path class="edge" d="M 0 0 V -5.81331 H 12.2667"/>
+								<path class="edge e22" d="M 0 0 V -5.81331 H 12.2667"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">2</text>
 							</g>
 							<g class="a15 i1 leaf node n3 p0 sample" transform="translate(12.2667 5.81331)">
-								<path class="edge" d="M 0 0 V -5.81331 H -12.2667"/>
+								<path class="edge e23" d="M 0 0 V -5.81331 H -12.2667"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">3</text>
 							</g>
-							<path class="edge" d="M 0 0 V -25.9506 H -41.4"/>
+							<path class="edge e90" d="M 0 0 V -25.9506 H -41.4"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab rgt" transform="translate(3 -7)">15</text>
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diff --git a/python/tests/data/svg/ts_multiroot.svg b/python/tests/data/svg/ts_multiroot.svg
index 9d2637d45a..c4ffeea709 100644
--- a/python/tests/data/svg/ts_multiroot.svg
+++ b/python/tests/data/svg/ts_multiroot.svg
@@ -198,7 +198,7 @@
 					<g class="c2 i1 node n15 p0 root" transform="translate(101.467 26.8)">
 						<g class="a15 c3 i7 m0 m2 node n6 p0 s1 s3" transform="translate(31.3333 75.68)">
 							<g class="a6 i12 leaf m1 node n2 p0 s1 sample" transform="translate(-25.0667 18.92)">
-								<path class="edge" d="M 0 0 V -18.92 H 25.0667"/>
+								<path class="edge e0" d="M 0 0 V -18.92 H 25.0667"/>
 								<g class="mut m1 s1 unknown_time" transform="translate(0 -9.46)">
 									<line x1="0" x2="0" y1="0" y2="9.46"/>
 									<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -208,16 +208,16 @@
 								<text class="lab" transform="translate(0 11)">2</text>
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 							<g class="a6 i14 leaf node n4 p0 sample" transform="translate(0.0 18.92)">
-								<path class="edge" d="M 0 0 V -18.92 H 0.0"/>
+								<path class="edge e2" d="M 0 0 V -18.92 H 0.0"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">4</text>
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 							<g class="a6 i15 leaf node n5 p0 sample" transform="translate(25.0667 18.92)">
-								<path class="edge" d="M 0 0 V -18.92 H -25.0667"/>
+								<path class="edge e3" d="M 0 0 V -18.92 H -25.0667"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">5</text>
 							</g>
-							<path class="edge" d="M 0 0 V -75.68 H -31.3333"/>
+							<path class="edge e22" d="M 0 0 V -75.68 H -31.3333"/>
 							<g class="mut m0 s1 unknown_time" transform="translate(0 -50.4533)">
 								<line x1="0" x2="0" y1="0" y2="50.4533"/>
 								<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -233,16 +233,16 @@
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 							<g class="a11 i11 leaf node n1 p0 sample" transform="translate(-12.5333 37.84)">
-								<path class="edge" d="M 0 0 V -37.84 H 12.5333"/>
+								<path class="edge e12" d="M 0 0 V -37.84 H 12.5333"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
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 							<g class="a11 i13 leaf node n3 p0 sample" transform="translate(12.5333 37.84)">
-								<path class="edge" d="M 0 0 V -37.84 H -12.5333"/>
+								<path class="edge e13" d="M 0 0 V -37.84 H -12.5333"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">3</text>
 							</g>
-							<path class="edge" d="M 0 0 V -56.76 H 31.3333"/>
+							<path class="edge e23" d="M 0 0 V -56.76 H 31.3333"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab lft" transform="translate(-3 -7)">11</text>
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@@ -255,7 +255,7 @@
 				<g class="plotbox">
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 						<g class="a12 i10 leaf m3 node n0 p0 s4 sample" transform="translate(-18.8 56.76)">
-							<path class="edge" d="M 0 0 V -56.76 H 18.8"/>
+							<path class="edge e14" d="M 0 0 V -56.76 H 18.8"/>
 							<g class="mut m3 s4 unknown_time" transform="translate(0 -28.38)">
 								<line x1="0" x2="0" y1="0" y2="28.38"/>
 								<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -266,16 +266,16 @@
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 							<g class="a11 i11 leaf node n1 p0 sample" transform="translate(-12.5333 37.84)">
-								<path class="edge" d="M 0 0 V -37.84 H 12.5333"/>
+								<path class="edge e12" d="M 0 0 V -37.84 H 12.5333"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
 							<g class="a11 i13 leaf node n3 p0 sample" transform="translate(12.5333 37.84)">
-								<path class="edge" d="M 0 0 V -37.84 H -12.5333"/>
+								<path class="edge e13" d="M 0 0 V -37.84 H -12.5333"/>
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 								<text class="lab" transform="translate(0 11)">3</text>
 							</g>
-							<path class="edge" d="M 0 0 V -18.92 H -18.8"/>
+							<path class="edge e15" d="M 0 0 V -18.92 H -18.8"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
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@@ -284,17 +284,17 @@
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-							<path class="edge" d="M 0 0 V -18.92 H 25.0667"/>
+							<path class="edge e0" d="M 0 0 V -18.92 H 25.0667"/>
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 						<g class="a6 i14 leaf node n4 p0 sample" transform="translate(0.0 18.92)">
-							<path class="edge" d="M 0 0 V -18.92 H 0.0"/>
+							<path class="edge e2" d="M 0 0 V -18.92 H 0.0"/>
 							<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 							<text class="lab" transform="translate(0 11)">4</text>
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 						<g class="a6 i15 leaf node n5 p0 sample" transform="translate(25.0667 18.92)">
-							<path class="edge" d="M 0 0 V -18.92 H -25.0667"/>
+							<path class="edge e3" d="M 0 0 V -18.92 H -25.0667"/>
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@@ -312,17 +312,17 @@
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-								<path class="edge" d="M 0 0 V -18.92 H 25.0667"/>
+								<path class="edge e0" d="M 0 0 V -18.92 H 25.0667"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
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 							<g class="a6 i14 leaf node n4 p0 sample" transform="translate(0.0 18.92)">
-								<path class="edge" d="M 0 0 V -18.92 H 0.0"/>
+								<path class="edge e2" d="M 0 0 V -18.92 H 0.0"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">4</text>
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-								<path class="edge" d="M 0 0 V -18.92 H -25.0667"/>
+								<path class="edge e3" d="M 0 0 V -18.92 H -25.0667"/>
 								<g class="mut m4 s5 unknown_time" transform="translate(0 -9.46)">
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@@ -331,22 +331,22 @@
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 								<text class="lab" transform="translate(0 11)">5</text>
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+								<path class="edge e12" d="M 0 0 V -37.84 H 12.5333"/>
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+							<path class="edge e21" d="M 0 0 V -56.76 H 31.3333"/>
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@@ -364,36 +364,36 @@
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 							<g class="a6 i12 leaf node n2 p0 sample" transform="translate(-25.0667 18.92)">
-								<path class="edge" d="M 0 0 V -18.92 H 25.0667"/>
+								<path class="edge e0" d="M 0 0 V -18.92 H 25.0667"/>
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 								<text class="lab" transform="translate(0 11)">2</text>
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 							<g class="a6 i14 leaf node n4 p0 sample" transform="translate(0.0 18.92)">
-								<path class="edge" d="M 0 0 V -18.92 H 0.0"/>
+								<path class="edge e2" d="M 0 0 V -18.92 H 0.0"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">4</text>
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 							<g class="a6 i15 leaf node n5 p0 sample" transform="translate(25.0667 18.92)">
-								<path class="edge" d="M 0 0 V -18.92 H -25.0667"/>
+								<path class="edge e3" d="M 0 0 V -18.92 H -25.0667"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">5</text>
 							</g>
-							<path class="edge" d="M 0 0 V -75.68 H -31.3333"/>
+							<path class="edge e19" d="M 0 0 V -75.68 H -31.3333"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
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 						<g class="a14 c2 i8 node n7 p0" transform="translate(-31.3333 75.68)">
 							<g class="a7 i11 leaf node n1 p0 sample" transform="translate(-12.5333 18.92)">
-								<path class="edge" d="M 0 0 V -18.92 H 12.5333"/>
+								<path class="edge e4" d="M 0 0 V -18.92 H 12.5333"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
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 							<g class="a7 i13 leaf node n3 p0 sample" transform="translate(12.5333 18.92)">
-								<path class="edge" d="M 0 0 V -18.92 H -12.5333"/>
+								<path class="edge e5" d="M 0 0 V -18.92 H -12.5333"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">3</text>
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-							<path class="edge" d="M 0 0 V -75.68 H 31.3333"/>
+							<path class="edge e20" d="M 0 0 V -75.68 H 31.3333"/>
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@@ -406,7 +406,7 @@
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 						<g class="a13 i10 leaf m5 node n0 p0 s7 sample" transform="translate(-28.2 75.68)">
-							<path class="edge" d="M 0 0 V -75.68 H 28.2"/>
+							<path class="edge e16" d="M 0 0 V -75.68 H 28.2"/>
 							<g class="mut m5 s7 unknown_time" transform="translate(0 -37.84)">
 								<line x1="0" x2="0" y1="0" y2="37.84"/>
 								<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -417,7 +417,7 @@
 						</g>
 						<g class="a13 c2 i5 node n10 p0" transform="translate(28.2 37.84)">
 							<g class="a10 i15 leaf m6 node n5 p0 s7 sample" transform="translate(18.8 37.84)">
-								<path class="edge" d="M 0 0 V -37.84 H -18.8"/>
+								<path class="edge e10" d="M 0 0 V -37.84 H -18.8"/>
 								<g class="mut m6 s7 unknown_time" transform="translate(0 -18.92)">
 									<line x1="0" x2="0" y1="0" y2="18.92"/>
 									<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -428,20 +428,20 @@
 							</g>
 							<g class="a10 c2 i7 node n6 p0" transform="translate(-18.8 18.92)">
 								<g class="a6 i12 leaf node n2 p0 sample" transform="translate(-12.5333 18.92)">
-									<path class="edge" d="M 0 0 V -18.92 H 12.5333"/>
+									<path class="edge e0" d="M 0 0 V -18.92 H 12.5333"/>
 									<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 									<text class="lab" transform="translate(0 11)">2</text>
 								</g>
 								<g class="a6 i14 leaf node n4 p0 sample" transform="translate(12.5333 18.92)">
-									<path class="edge" d="M 0 0 V -18.92 H -12.5333"/>
+									<path class="edge e2" d="M 0 0 V -18.92 H -12.5333"/>
 									<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 									<text class="lab" transform="translate(0 11)">4</text>
 								</g>
-								<path class="edge" d="M 0 0 V -18.92 H 18.8"/>
+								<path class="edge e11" d="M 0 0 V -18.92 H 18.8"/>
 								<circle class="sym" cx="0" cy="0" r="3"/>
 								<text class="lab lft" transform="translate(-3 -7)">6</text>
 							</g>
-							<path class="edge" d="M 0 0 V -37.84 H -28.2"/>
+							<path class="edge e18" d="M 0 0 V -37.84 H -28.2"/>
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 							<text class="lab rgt" transform="translate(3 -7)">10</text>
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@@ -450,12 +450,12 @@
 					</g>
 					<g class="c2 i8 node n7 p0 root" transform="translate(145.333 102.48)">
 						<g class="a7 i11 leaf node n1 p0 sample" transform="translate(-12.5333 18.92)">
-							<path class="edge" d="M 0 0 V -18.92 H 12.5333"/>
+							<path class="edge e4" d="M 0 0 V -18.92 H 12.5333"/>
 							<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 							<text class="lab" transform="translate(0 11)">1</text>
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 						<g class="a7 i13 leaf node n3 p0 sample" transform="translate(12.5333 18.92)">
-							<path class="edge" d="M 0 0 V -18.92 H -12.5333"/>
+							<path class="edge e5" d="M 0 0 V -18.92 H -12.5333"/>
 							<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 							<text class="lab" transform="translate(0 11)">3</text>
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@@ -468,12 +468,12 @@
 				<g class="plotbox">
 					<g class="c2 i2 node n13 p0 root" transform="translate(45.0667 45.72)">
 						<g class="a13 i10 leaf node n0 p0 sample" transform="translate(-12.5333 75.68)">
-							<path class="edge" d="M 0 0 V -75.68 H 12.5333"/>
+							<path class="edge e16" d="M 0 0 V -75.68 H 12.5333"/>
 							<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 							<text class="lab" transform="translate(0 11)">0</text>
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 						<g class="a13 i15 leaf node n5 p0 sample" transform="translate(12.5333 75.68)">
-							<path class="edge" d="M 0 0 V -75.68 H -12.5333"/>
+							<path class="edge e17" d="M 0 0 V -75.68 H -12.5333"/>
 							<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 							<text class="lab" transform="translate(0 11)">5</text>
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@@ -482,12 +482,12 @@
 					</g>
 					<g class="c2 i8 node n7 p0 root" transform="translate(95.2 102.48)">
 						<g class="a7 i11 leaf node n1 p0 sample" transform="translate(-12.5333 18.92)">
-							<path class="edge" d="M 0 0 V -18.92 H 12.5333"/>
+							<path class="edge e4" d="M 0 0 V -18.92 H 12.5333"/>
 							<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 							<text class="lab" transform="translate(0 11)">1</text>
 						</g>
 						<g class="a7 i13 leaf node n3 p0 sample" transform="translate(12.5333 18.92)">
-							<path class="edge" d="M 0 0 V -18.92 H -12.5333"/>
+							<path class="edge e5" d="M 0 0 V -18.92 H -12.5333"/>
 							<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 							<text class="lab" transform="translate(0 11)">3</text>
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@@ -496,12 +496,12 @@
 					</g>
 					<g class="c2 i7 node n6 p0 root" transform="translate(145.333 102.48)">
 						<g class="a6 i12 leaf node n2 p0 sample" transform="translate(-12.5333 18.92)">
-							<path class="edge" d="M 0 0 V -18.92 H 12.5333"/>
+							<path class="edge e0" d="M 0 0 V -18.92 H 12.5333"/>
 							<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 							<text class="lab" transform="translate(0 11)">2</text>
 						</g>
 						<g class="a6 i14 leaf node n4 p0 sample" transform="translate(12.5333 18.92)">
-							<path class="edge" d="M 0 0 V -18.92 H -12.5333"/>
+							<path class="edge e2" d="M 0 0 V -18.92 H -12.5333"/>
 							<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 							<text class="lab" transform="translate(0 11)">4</text>
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@@ -514,7 +514,7 @@
 				<g class="plotbox">
 					<g class="c2 i9 node n8 p0 root" transform="translate(45.0667 102.48)">
 						<g class="a8 i10 leaf m8 node n0 p0 s8 sample" transform="translate(-12.5333 18.92)">
-							<path class="edge" d="M 0 0 V -18.92 H 12.5333"/>
+							<path class="edge e6" d="M 0 0 V -18.92 H 12.5333"/>
 							<g class="mut m8 s8 unknown_time" transform="translate(0 -9.46)">
 								<line x1="0" x2="0" y1="0" y2="9.46"/>
 								<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -524,7 +524,7 @@
 							<text class="lab" transform="translate(0 11)">0</text>
 						</g>
 						<g class="a8 i15 leaf node n5 p0 sample" transform="translate(12.5333 18.92)">
-							<path class="edge" d="M 0 0 V -18.92 H -12.5333"/>
+							<path class="edge e7" d="M 0 0 V -18.92 H -12.5333"/>
 							<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 							<text class="lab" transform="translate(0 11)">5</text>
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@@ -537,12 +537,12 @@
 					</g>
 					<g class="c3 i7 node n6 p0 root" transform="translate(132.8 102.48)">
 						<g class="a6 i12 leaf node n2 p0 sample" transform="translate(-25.0667 18.92)">
-							<path class="edge" d="M 0 0 V -18.92 H 25.0667"/>
+							<path class="edge e0" d="M 0 0 V -18.92 H 25.0667"/>
 							<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 							<text class="lab" transform="translate(0 11)">2</text>
 						</g>
 						<g class="a6 i14 leaf m7 node n4 p0 s8 sample" transform="translate(25.0667 18.92)">
-							<path class="edge" d="M 0 0 V -18.92 H -25.0667"/>
+							<path class="edge e2" d="M 0 0 V -18.92 H -25.0667"/>
 							<g class="mut m7 s8 unknown_time" transform="translate(0 -9.46)">
 								<line x1="0" x2="0" y1="0" y2="9.46"/>
 								<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -552,7 +552,7 @@
 							<text class="lab" transform="translate(0 11)">4</text>
 						</g>
 						<g class="a6 i13 leaf node n3 p0 sample" transform="translate(0.0 18.92)">
-							<path class="edge" d="M 0 0 V -18.92 H 0.0"/>
+							<path class="edge e1" d="M 0 0 V -18.92 H 0.0"/>
 							<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 							<text class="lab" transform="translate(0 11)">3</text>
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@@ -565,22 +565,22 @@
 				<g class="plotbox">
 					<g class="c2 i4 node n9 p0 root" transform="translate(63.8667 83.56)">
 						<g class="a9 i11 leaf node n1 p0 sample" transform="translate(18.8 37.84)">
-							<path class="edge" d="M 0 0 V -37.84 H -18.8"/>
+							<path class="edge e8" d="M 0 0 V -37.84 H -18.8"/>
 							<rect class="sym" height="6" width="6" x="-3" y="-3"/>
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 						<g class="a9 c2 i9 node n8 p0" transform="translate(-18.8 18.92)">
 							<g class="a8 i10 leaf node n0 p0 sample" transform="translate(-12.5333 18.92)">
-								<path class="edge" d="M 0 0 V -18.92 H 12.5333"/>
+								<path class="edge e6" d="M 0 0 V -18.92 H 12.5333"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">0</text>
 							</g>
 							<g class="a8 i15 leaf node n5 p0 sample" transform="translate(12.5333 18.92)">
-								<path class="edge" d="M 0 0 V -18.92 H -12.5333"/>
+								<path class="edge e7" d="M 0 0 V -18.92 H -12.5333"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">5</text>
 							</g>
-							<path class="edge" d="M 0 0 V -18.92 H 18.8"/>
+							<path class="edge e9" d="M 0 0 V -18.92 H 18.8"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab lft" transform="translate(-3 -7)">8</text>
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@@ -589,7 +589,7 @@
 					</g>
 					<g class="c3 i7 node n6 p0 root" transform="translate(132.8 102.48)">
 						<g class="a6 i12 leaf m9 node n2 p0 s9 sample" transform="translate(-25.0667 18.92)">
-							<path class="edge" d="M 0 0 V -18.92 H 25.0667"/>
+							<path class="edge e0" d="M 0 0 V -18.92 H 25.0667"/>
 							<g class="mut m9 s9 unknown_time" transform="translate(0 -9.46)">
 								<line x1="0" x2="0" y1="0" y2="9.46"/>
 								<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -599,12 +599,12 @@
 							<text class="lab" transform="translate(0 11)">2</text>
 						</g>
 						<g class="a6 i14 leaf node n4 p0 sample" transform="translate(25.0667 18.92)">
-							<path class="edge" d="M 0 0 V -18.92 H -25.0667"/>
+							<path class="edge e2" d="M 0 0 V -18.92 H -25.0667"/>
 							<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 							<text class="lab" transform="translate(0 11)">4</text>
 						</g>
 						<g class="a6 i13 leaf node n3 p0 sample" transform="translate(0.0 18.92)">
-							<path class="edge" d="M 0 0 V -18.92 H 0.0"/>
+							<path class="edge e1" d="M 0 0 V -18.92 H 0.0"/>
 							<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 							<text class="lab" transform="translate(0 11)">3</text>
 						</g>
diff --git a/python/tests/data/svg/ts_mut_highlight.svg b/python/tests/data/svg/ts_mut_highlight.svg
index 72c9fda2d8..0afc4d199f 100644
--- a/python/tests/data/svg/ts_mut_highlight.svg
+++ b/python/tests/data/svg/ts_mut_highlight.svg
@@ -102,31 +102,31 @@
 					<g class="c2 m0 m1 node n9 p0 root s0" transform="translate(96 22.3778)">
 						<g class="a9 c2 node n4 p0" transform="translate(-38 97.7739)">
 							<g class="a4 leaf node n0 p0 sample" transform="translate(-19 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H 19"/>
+								<path class="edge e0" d="M 0 0 V -1.24828 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">0</text>
 							</g>
 							<g class="a4 leaf node n1 p0 sample" transform="translate(19 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H -19"/>
+								<path class="edge e1" d="M 0 0 V -1.24828 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
-							<path class="edge" d="M 0 0 V -97.7739 H 38"/>
+							<path class="edge e12" d="M 0 0 V -97.7739 H 38"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab lft" transform="translate(-3 -7)">4</text>
 						</g>
 						<g class="a9 c2 m2 node n5 p0 s0" transform="translate(38 86.9138)">
 							<g class="a5 leaf node n2 p0 sample" transform="translate(-19 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H 19"/>
+								<path class="edge e2" d="M 0 0 V -12.1084 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">2</text>
 							</g>
 							<g class="a5 leaf node n3 p0 sample" transform="translate(19 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H -19"/>
+								<path class="edge e3" d="M 0 0 V -12.1084 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">3</text>
 							</g>
-							<path class="edge" d="M 0 0 V -86.9138 H -38"/>
+							<path class="edge e13" d="M 0 0 V -86.9138 H -38"/>
 							<g class="mut m2 s0 unknown_time" transform="translate(0 -43.4569)">
 								<line x1="0" x2="0" y1="0" y2="43.4569"/>
 								<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -135,7 +135,7 @@
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab rgt" transform="translate(3 -7)">5</text>
 						</g>
-						<path class="edge" d="M 0 0 V -12.3778 H 0"/>
+						<path class="edge root" d="M 0 0 V -12.3778 H 0"/>
 						<g class="mut m0 s0 unknown_time" transform="translate(0 -8.25185)">
 							<line x1="0" x2="0" y1="0" y2="8.25185"/>
 							<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -156,16 +156,16 @@
 					<g class="c2 m5 node n7 p0 root s2" transform="translate(96 63.504)">
 						<g class="a7 c2 m3 m4 node n4 p0 s1" transform="translate(-38 56.6478)">
 							<g class="a4 leaf node n0 p0 sample" transform="translate(-19 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H 19"/>
+								<path class="edge e0" d="M 0 0 V -1.24828 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">0</text>
 							</g>
 							<g class="a4 leaf node n1 p0 sample" transform="translate(19 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H -19"/>
+								<path class="edge e1" d="M 0 0 V -1.24828 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
-							<path class="edge" d="M 0 0 V -56.6478 H 38"/>
+							<path class="edge e6" d="M 0 0 V -56.6478 H 38"/>
 							<g class="mut m3 s1 unknown_time" transform="translate(0 -37.7652)">
 								<line x1="0" x2="0" y1="0" y2="37.7652"/>
 								<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -181,12 +181,12 @@
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 						<g class="a7 c2 node n5 p0" transform="translate(38 45.7876)">
 							<g class="a5 leaf node n2 p0 sample" transform="translate(-19 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H 19"/>
+								<path class="edge e2" d="M 0 0 V -12.1084 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">2</text>
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 							<g class="a5 leaf m6 node n3 p0 s2 sample" transform="translate(19 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H -19"/>
+								<path class="edge e3" d="M 0 0 V -12.1084 H -19"/>
 								<g class="mut m6 s2 unknown_time" transform="translate(0 -6.05422)">
 									<line x1="0" x2="0" y1="0" y2="6.05422"/>
 									<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -195,11 +195,11 @@
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 								<text class="lab" transform="translate(0 11)">3</text>
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-							<path class="edge" d="M 0 0 V -45.7876 H -38"/>
+							<path class="edge e8" d="M 0 0 V -45.7876 H -38"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab rgt" transform="translate(3 -7)">5</text>
 						</g>
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@@ -298,35 +298,35 @@
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diff --git a/python/tests/data/svg/ts_mut_times.svg b/python/tests/data/svg/ts_mut_times.svg
index 6f4955ec03..6e1f097a84 100644
--- a/python/tests/data/svg/ts_mut_times.svg
+++ b/python/tests/data/svg/ts_mut_times.svg
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@@ -135,7 +135,7 @@
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@@ -156,16 +156,16 @@
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@@ -181,12 +181,12 @@
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@@ -195,11 +195,11 @@
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@@ -215,35 +215,35 @@
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@@ -283,11 +283,11 @@
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diff --git a/python/tests/data/svg/ts_mut_times_logscale.svg b/python/tests/data/svg/ts_mut_times_logscale.svg
index 4ba7e1a005..57f597beef 100644
--- a/python/tests/data/svg/ts_mut_times_logscale.svg
+++ b/python/tests/data/svg/ts_mut_times_logscale.svg
@@ -102,31 +102,31 @@
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-								<path class="edge" d="M 0 0 V -4.28849 H 19"/>
+								<path class="edge e0" d="M 0 0 V -4.28849 H 19"/>
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 							<g class="a4 leaf node n1 p0 sample" transform="translate(19 4.28849)">
-								<path class="edge" d="M 0 0 V -4.28849 H -19"/>
+								<path class="edge e1" d="M 0 0 V -4.28849 H -19"/>
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 								<text class="lab" transform="translate(0 11)">1</text>
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-							<path class="edge" d="M 0 0 V -87.1271 H 38"/>
+							<path class="edge e12" d="M 0 0 V -87.1271 H 38"/>
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-								<path class="edge" d="M 0 0 V -29.5511 H 19"/>
+								<path class="edge e2" d="M 0 0 V -29.5511 H 19"/>
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-								<path class="edge" d="M 0 0 V -29.5511 H -19"/>
+								<path class="edge e3" d="M 0 0 V -29.5511 H -19"/>
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 								<text class="lab" transform="translate(0 11)">3</text>
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-							<path class="edge" d="M 0 0 V -61.8645 H -38"/>
+							<path class="edge e13" d="M 0 0 V -61.8645 H -38"/>
 							<g class="mut m2 s0" transform="translate(0 -61.5372)">
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@@ -135,7 +135,7 @@
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-						<path class="edge" d="M 0 0 V -18.2656 H 0"/>
+						<path class="edge root" d="M 0 0 V -18.2656 H 0"/>
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@@ -156,16 +156,16 @@
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 							<g class="a4 leaf node n0 p0 sample" transform="translate(-19 4.28849)">
-								<path class="edge" d="M 0 0 V -4.28849 H 19"/>
+								<path class="edge e0" d="M 0 0 V -4.28849 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">0</text>
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 							<g class="a4 leaf node n1 p0 sample" transform="translate(19 4.28849)">
-								<path class="edge" d="M 0 0 V -4.28849 H -19"/>
+								<path class="edge e1" d="M 0 0 V -4.28849 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
-							<path class="edge" d="M 0 0 V -68.589 H 38"/>
+							<path class="edge e6" d="M 0 0 V -68.589 H 38"/>
 							<g class="mut m3 s1" transform="translate(0 -33.5107)">
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 								<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -181,12 +181,12 @@
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 						<g class="a7 c2 node n5 p0" transform="translate(38 43.3264)">
 							<g class="a5 leaf node n2 p0 sample" transform="translate(-19 29.5511)">
-								<path class="edge" d="M 0 0 V -29.5511 H 19"/>
+								<path class="edge e2" d="M 0 0 V -29.5511 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">2</text>
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 							<g class="a5 leaf m6 node n3 p0 s2 sample" transform="translate(19 29.5511)">
-								<path class="edge" d="M 0 0 V -29.5511 H -19"/>
+								<path class="edge e3" d="M 0 0 V -29.5511 H -19"/>
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@@ -195,11 +195,11 @@
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 								<text class="lab" transform="translate(0 11)">3</text>
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-							<path class="edge" d="M 0 0 V -43.3264 H -38"/>
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-						<path class="edge" d="M 0 0 V -21.9812 H 0"/>
+						<path class="edge root" d="M 0 0 V -21.9812 H 0"/>
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@@ -215,35 +215,35 @@
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-								<path class="edge" d="M 0 0 V -4.28849 H 19"/>
+								<path class="edge e0" d="M 0 0 V -4.28849 H 19"/>
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 								<text class="lab" transform="translate(0 11)">0</text>
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 							<g class="a4 leaf node n1 p0 sample" transform="translate(19 4.28849)">
-								<path class="edge" d="M 0 0 V -4.28849 H -19"/>
+								<path class="edge e1" d="M 0 0 V -4.28849 H -19"/>
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 								<text class="lab" transform="translate(0 11)">1</text>
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-							<path class="edge" d="M 0 0 V -35.7303 H 38"/>
+							<path class="edge e4" d="M 0 0 V -35.7303 H 38"/>
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 							<text class="lab lft" transform="translate(-3 -7)">4</text>
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 						<g class="a6 c2 node n5 p0" transform="translate(38 10.4677)">
 							<g class="a5 leaf node n2 p0 sample" transform="translate(-19 29.5511)">
-								<path class="edge" d="M 0 0 V -29.5511 H 19"/>
+								<path class="edge e2" d="M 0 0 V -29.5511 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">2</text>
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 							<g class="a5 leaf node n3 p0 sample" transform="translate(19 29.5511)">
-								<path class="edge" d="M 0 0 V -29.5511 H -19"/>
+								<path class="edge e3" d="M 0 0 V -29.5511 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">3</text>
 							</g>
-							<path class="edge" d="M 0 0 V -10.4677 H -38"/>
+							<path class="edge e5" d="M 0 0 V -10.4677 H -38"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab rgt" transform="translate(3 -7)">5</text>
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-						<path class="edge" d="M 0 0 V -13.2144 H 0"/>
+						<path class="edge root" d="M 0 0 V -13.2144 H 0"/>
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@@ -254,27 +254,27 @@
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 							<g class="a4 leaf node n0 p0 sample" transform="translate(-19 4.28849)">
-								<path class="edge" d="M 0 0 V -4.28849 H 19"/>
+								<path class="edge e0" d="M 0 0 V -4.28849 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">0</text>
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 							<g class="a4 leaf node n1 p0 sample" transform="translate(19 4.28849)">
-								<path class="edge" d="M 0 0 V -4.28849 H -19"/>
+								<path class="edge e1" d="M 0 0 V -4.28849 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
-							<path class="edge" d="M 0 0 V -68.589 H 38"/>
+							<path class="edge e7" d="M 0 0 V -68.589 H 38"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab lft" transform="translate(-3 -7)">4</text>
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 						<g class="a7 c2 node n5 p0" transform="translate(38 43.3264)">
 							<g class="a5 leaf node n2 p0 sample" transform="translate(-19 29.5511)">
-								<path class="edge" d="M 0 0 V -29.5511 H 19"/>
+								<path class="edge e2" d="M 0 0 V -29.5511 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">2</text>
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 							<g class="a5 leaf m7 node n3 p0 s4 sample" transform="translate(19 29.5511)">
-								<path class="edge" d="M 0 0 V -29.5511 H -19"/>
+								<path class="edge e3" d="M 0 0 V -29.5511 H -19"/>
 								<g class="mut m7 s4" transform="translate(0 -27.4203)">
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@@ -283,11 +283,11 @@
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 								<text class="lab" transform="translate(0 11)">3</text>
 							</g>
-							<path class="edge" d="M 0 0 V -43.3264 H -38"/>
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-						<path class="edge" d="M 0 0 V -13.2144 H 0"/>
+						<path class="edge root" d="M 0 0 V -13.2144 H 0"/>
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@@ -298,35 +298,35 @@
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 						<g class="a8 c2 node n4 p0" transform="translate(-38 75.8041)">
 							<g class="a4 leaf node n0 p0 sample" transform="translate(-19 4.28849)">
-								<path class="edge" d="M 0 0 V -4.28849 H 19"/>
+								<path class="edge e0" d="M 0 0 V -4.28849 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">0</text>
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 							<g class="a4 leaf node n1 p0 sample" transform="translate(19 4.28849)">
-								<path class="edge" d="M 0 0 V -4.28849 H -19"/>
+								<path class="edge e1" d="M 0 0 V -4.28849 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
-							<path class="edge" d="M 0 0 V -75.8041 H 38"/>
+							<path class="edge e10" d="M 0 0 V -75.8041 H 38"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab lft" transform="translate(-3 -7)">4</text>
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 						<g class="a8 c2 node n5 p0" transform="translate(38 50.5416)">
 							<g class="a5 leaf node n2 p0 sample" transform="translate(-19 29.5511)">
-								<path class="edge" d="M 0 0 V -29.5511 H 19"/>
+								<path class="edge e2" d="M 0 0 V -29.5511 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">2</text>
 							</g>
 							<g class="a5 leaf node n3 p0 sample" transform="translate(19 29.5511)">
-								<path class="edge" d="M 0 0 V -29.5511 H -19"/>
+								<path class="edge e3" d="M 0 0 V -29.5511 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">3</text>
 							</g>
-							<path class="edge" d="M 0 0 V -50.5416 H -38"/>
+							<path class="edge e11" d="M 0 0 V -50.5416 H -38"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab rgt" transform="translate(3 -7)">5</text>
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-						<path class="edge" d="M 0 0 V -13.2144 H 0"/>
+						<path class="edge root" d="M 0 0 V -13.2144 H 0"/>
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diff --git a/python/tests/data/svg/ts_mut_times_titles.svg b/python/tests/data/svg/ts_mut_times_titles.svg
index 5a76bff164..1d6873118b 100644
--- a/python/tests/data/svg/ts_mut_times_titles.svg
+++ b/python/tests/data/svg/ts_mut_times_titles.svg
@@ -118,20 +118,20 @@
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 						<g class="a9 c2 node n4 p0" transform="translate(-38 66.6067)">
 							<g class="a4 leaf node n0 p0 sample" transform="translate(-19 0.850364)">
-								<path class="edge" d="M 0 0 V -0.850364 H 19"/>
+								<path class="edge e0" d="M 0 0 V -0.850364 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3">
 									<title>NoDe0!</title>
 								</rect>
 								<text class="lab" transform="translate(0 11)">0</text>
 							</g>
 							<g class="a4 leaf node n1 p0 sample" transform="translate(19 0.850364)">
-								<path class="edge" d="M 0 0 V -0.850364 H -19"/>
+								<path class="edge e1" d="M 0 0 V -0.850364 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3">
 									<title>NoDe1!</title>
 								</rect>
 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
-							<path class="edge" d="M 0 0 V -66.6067 H 38"/>
+							<path class="edge e12" d="M 0 0 V -66.6067 H 38"/>
 							<circle class="sym" cx="0" cy="0" r="3">
 								<title>NoDe4!</title>
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@@ -139,20 +139,20 @@
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 						<g class="a9 c2 m2 node n5 p0 s0" transform="translate(38 59.2084)">
 							<g class="a5 leaf node n2 p0 sample" transform="translate(-19 8.24865)">
-								<path class="edge" d="M 0 0 V -8.24865 H 19"/>
+								<path class="edge e2" d="M 0 0 V -8.24865 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3">
 									<title>NoDe2!</title>
 								</rect>
 								<text class="lab" transform="translate(0 11)">2</text>
 							</g>
 							<g class="a5 leaf node n3 p0 sample" transform="translate(19 8.24865)">
-								<path class="edge" d="M 0 0 V -8.24865 H -19"/>
+								<path class="edge e3" d="M 0 0 V -8.24865 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3">
 									<title>NoDe3!</title>
 								</rect>
 								<text class="lab" transform="translate(0 11)">3</text>
 							</g>
-							<path class="edge" d="M 0 0 V -59.2084 H -38"/>
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@@ -165,7 +165,7 @@
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 							<text class="lab rgt" transform="translate(3 -7)">5</text>
 						</g>
-						<path class="edge" d="M 0 0 V -43.943 H 0"/>
+						<path class="edge root" d="M 0 0 V -43.943 H 0"/>
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 							<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6">
@@ -192,20 +192,20 @@
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 						<g class="a7 c2 m3 m4 node n4 p0 s1" transform="translate(-38 38.5902)">
 							<g class="a4 leaf node n0 p0 sample" transform="translate(-19 0.850364)">
-								<path class="edge" d="M 0 0 V -0.850364 H 19"/>
+								<path class="edge e0" d="M 0 0 V -0.850364 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3">
 									<title>NoDe0!</title>
 								</rect>
 								<text class="lab" transform="translate(0 11)">0</text>
 							</g>
 							<g class="a4 leaf node n1 p0 sample" transform="translate(19 0.850364)">
-								<path class="edge" d="M 0 0 V -0.850364 H -19"/>
+								<path class="edge e1" d="M 0 0 V -0.850364 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3">
 									<title>NoDe1!</title>
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 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
-							<path class="edge" d="M 0 0 V -38.5902 H 38"/>
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@@ -227,14 +227,14 @@
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-								<path class="edge" d="M 0 0 V -8.24865 H 19"/>
+								<path class="edge e2" d="M 0 0 V -8.24865 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3">
 									<title>NoDe2!</title>
 								</rect>
 								<text class="lab" transform="translate(0 11)">2</text>
 							</g>
 							<g class="a5 leaf m6 node n3 p0 s2 sample" transform="translate(19 8.24865)">
-								<path class="edge" d="M 0 0 V -8.24865 H -19"/>
+								<path class="edge e3" d="M 0 0 V -8.24865 H -19"/>
 								<g class="mut m6 s2" transform="translate(0 -7.42667)">
 									<line x1="0" x2="0" y1="0" y2="7.42667"/>
 									<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6">
@@ -247,13 +247,13 @@
 								</rect>
 								<text class="lab" transform="translate(0 11)">3</text>
 							</g>
-							<path class="edge" d="M 0 0 V -31.1919 H -38"/>
+							<path class="edge e8" d="M 0 0 V -31.1919 H -38"/>
 							<circle class="sym" cx="0" cy="0" r="3">
 								<title>NoDe5!</title>
 							</circle>
 							<text class="lab rgt" transform="translate(3 -7)">5</text>
 						</g>
-						<path class="edge" d="M 0 0 V -34.8261 H 0"/>
+						<path class="edge root" d="M 0 0 V -34.8261 H 0"/>
 						<g class="mut m5 s2" transform="translate(0 -34.8261)">
 							<line x1="0" x2="0" y1="0" y2="34.8261"/>
 							<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6">
@@ -273,20 +273,20 @@
 					<g class="c2 node n6 p0 root" transform="translate(96 108.403)">
 						<g class="a6 c2 node n4 p0" transform="translate(-38 12.1467)">
 							<g class="a4 leaf node n0 p0 sample" transform="translate(-19 0.850364)">
-								<path class="edge" d="M 0 0 V -0.850364 H 19"/>
+								<path class="edge e0" d="M 0 0 V -0.850364 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3">
 									<title>NoDe0!</title>
 								</rect>
 								<text class="lab" transform="translate(0 11)">0</text>
 							</g>
 							<g class="a4 leaf node n1 p0 sample" transform="translate(19 0.850364)">
-								<path class="edge" d="M 0 0 V -0.850364 H -19"/>
+								<path class="edge e1" d="M 0 0 V -0.850364 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3">
 									<title>NoDe1!</title>
 								</rect>
 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
-							<path class="edge" d="M 0 0 V -12.1467 H 38"/>
+							<path class="edge e4" d="M 0 0 V -12.1467 H 38"/>
 							<circle class="sym" cx="0" cy="0" r="3">
 								<title>NoDe4!</title>
 							</circle>
@@ -294,26 +294,26 @@
 						</g>
 						<g class="a6 c2 node n5 p0" transform="translate(38 4.74841)">
 							<g class="a5 leaf node n2 p0 sample" transform="translate(-19 8.24865)">
-								<path class="edge" d="M 0 0 V -8.24865 H 19"/>
+								<path class="edge e2" d="M 0 0 V -8.24865 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3">
 									<title>NoDe2!</title>
 								</rect>
 								<text class="lab" transform="translate(0 11)">2</text>
 							</g>
 							<g class="a5 leaf node n3 p0 sample" transform="translate(19 8.24865)">
-								<path class="edge" d="M 0 0 V -8.24865 H -19"/>
+								<path class="edge e3" d="M 0 0 V -8.24865 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3">
 									<title>NoDe3!</title>
 								</rect>
 								<text class="lab" transform="translate(0 11)">3</text>
 							</g>
-							<path class="edge" d="M 0 0 V -4.74841 H -38"/>
+							<path class="edge e5" d="M 0 0 V -4.74841 H -38"/>
 							<circle class="sym" cx="0" cy="0" r="3">
 								<title>NoDe5!</title>
 							</circle>
 							<text class="lab rgt" transform="translate(3 -7)">5</text>
 						</g>
-						<path class="edge" d="M 0 0 V -13.925 H 0"/>
+						<path class="edge root" d="M 0 0 V -13.925 H 0"/>
 						<circle class="sym" cx="0" cy="0" r="3">
 							<title>NoDe6!</title>
 						</circle>
@@ -326,20 +326,20 @@
 					<g class="c2 node n7 p0 root" transform="translate(96 81.9594)">
 						<g class="a7 c2 node n4 p0" transform="translate(-38 38.5902)">
 							<g class="a4 leaf node n0 p0 sample" transform="translate(-19 0.850364)">
-								<path class="edge" d="M 0 0 V -0.850364 H 19"/>
+								<path class="edge e0" d="M 0 0 V -0.850364 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3">
 									<title>NoDe0!</title>
 								</rect>
 								<text class="lab" transform="translate(0 11)">0</text>
 							</g>
 							<g class="a4 leaf node n1 p0 sample" transform="translate(19 0.850364)">
-								<path class="edge" d="M 0 0 V -0.850364 H -19"/>
+								<path class="edge e1" d="M 0 0 V -0.850364 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3">
 									<title>NoDe1!</title>
 								</rect>
 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
-							<path class="edge" d="M 0 0 V -38.5902 H 38"/>
+							<path class="edge e7" d="M 0 0 V -38.5902 H 38"/>
 							<circle class="sym" cx="0" cy="0" r="3">
 								<title>NoDe4!</title>
 							</circle>
@@ -347,14 +347,14 @@
 						</g>
 						<g class="a7 c2 node n5 p0" transform="translate(38 31.1919)">
 							<g class="a5 leaf node n2 p0 sample" transform="translate(-19 8.24865)">
-								<path class="edge" d="M 0 0 V -8.24865 H 19"/>
+								<path class="edge e2" d="M 0 0 V -8.24865 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3">
 									<title>NoDe2!</title>
 								</rect>
 								<text class="lab" transform="translate(0 11)">2</text>
 							</g>
 							<g class="a5 leaf m7 node n3 p0 s4 sample" transform="translate(19 8.24865)">
-								<path class="edge" d="M 0 0 V -8.24865 H -19"/>
+								<path class="edge e3" d="M 0 0 V -8.24865 H -19"/>
 								<g class="mut m7 s4" transform="translate(0 -7.42667)">
 									<line x1="0" x2="0" y1="0" y2="7.42667"/>
 									<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6">
@@ -367,13 +367,13 @@
 								</rect>
 								<text class="lab" transform="translate(0 11)">3</text>
 							</g>
-							<path class="edge" d="M 0 0 V -31.1919 H -38"/>
+							<path class="edge e9" d="M 0 0 V -31.1919 H -38"/>
 							<circle class="sym" cx="0" cy="0" r="3">
 								<title>NoDe5!</title>
 							</circle>
 							<text class="lab rgt" transform="translate(3 -7)">5</text>
 						</g>
-						<path class="edge" d="M 0 0 V -13.925 H 0"/>
+						<path class="edge root" d="M 0 0 V -13.925 H 0"/>
 						<circle class="sym" cx="0" cy="0" r="3">
 							<title>NoDe7!</title>
 						</circle>
@@ -386,20 +386,20 @@
 					<g class="c2 node n8 p0 root" transform="translate(96 72.5822)">
 						<g class="a8 c2 node n4 p0" transform="translate(-38 47.9674)">
 							<g class="a4 leaf node n0 p0 sample" transform="translate(-19 0.850364)">
-								<path class="edge" d="M 0 0 V -0.850364 H 19"/>
+								<path class="edge e0" d="M 0 0 V -0.850364 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3">
 									<title>NoDe0!</title>
 								</rect>
 								<text class="lab" transform="translate(0 11)">0</text>
 							</g>
 							<g class="a4 leaf node n1 p0 sample" transform="translate(19 0.850364)">
-								<path class="edge" d="M 0 0 V -0.850364 H -19"/>
+								<path class="edge e1" d="M 0 0 V -0.850364 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3">
 									<title>NoDe1!</title>
 								</rect>
 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
-							<path class="edge" d="M 0 0 V -47.9674 H 38"/>
+							<path class="edge e10" d="M 0 0 V -47.9674 H 38"/>
 							<circle class="sym" cx="0" cy="0" r="3">
 								<title>NoDe4!</title>
 							</circle>
@@ -407,26 +407,26 @@
 						</g>
 						<g class="a8 c2 node n5 p0" transform="translate(38 40.5692)">
 							<g class="a5 leaf node n2 p0 sample" transform="translate(-19 8.24865)">
-								<path class="edge" d="M 0 0 V -8.24865 H 19"/>
+								<path class="edge e2" d="M 0 0 V -8.24865 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3">
 									<title>NoDe2!</title>
 								</rect>
 								<text class="lab" transform="translate(0 11)">2</text>
 							</g>
 							<g class="a5 leaf node n3 p0 sample" transform="translate(19 8.24865)">
-								<path class="edge" d="M 0 0 V -8.24865 H -19"/>
+								<path class="edge e3" d="M 0 0 V -8.24865 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3">
 									<title>NoDe3!</title>
 								</rect>
 								<text class="lab" transform="translate(0 11)">3</text>
 							</g>
-							<path class="edge" d="M 0 0 V -40.5692 H -38"/>
+							<path class="edge e11" d="M 0 0 V -40.5692 H -38"/>
 							<circle class="sym" cx="0" cy="0" r="3">
 								<title>NoDe5!</title>
 							</circle>
 							<text class="lab rgt" transform="translate(3 -7)">5</text>
 						</g>
-						<path class="edge" d="M 0 0 V -13.925 H 0"/>
+						<path class="edge root" d="M 0 0 V -13.925 H 0"/>
 						<circle class="sym" cx="0" cy="0" r="3">
 							<title>NoDe8!</title>
 						</circle>
diff --git a/python/tests/data/svg/ts_mutations_no_edges.svg b/python/tests/data/svg/ts_mutations_no_edges.svg
index 7d0f4171f5..f85a652cf5 100644
--- a/python/tests/data/svg/ts_mutations_no_edges.svg
+++ b/python/tests/data/svg/ts_mutations_no_edges.svg
@@ -57,32 +57,32 @@
 			<g class="tree t0" transform="translate(20 0)">
 				<g class="plotbox">
 					<g class="leaf node n0 p0 root sample" transform="translate(26 121.4)">
-						<path class="edge" d="M 0 0 V -13.925 H 0"/>
+						<path class="edge root" d="M 0 0 V -13.925 H 0"/>
 						<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 						<text class="lab" transform="translate(0 11)">0</text>
 					</g>
 					<g class="leaf node n1 p0 root sample" transform="translate(38 121.4)">
-						<path class="edge" d="M 0 0 V -13.925 H 0"/>
+						<path class="edge root" d="M 0 0 V -13.925 H 0"/>
 						<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 						<text class="lab" transform="translate(0 11)">1</text>
 					</g>
 					<g class="leaf node n2 p0 root sample" transform="translate(50 121.4)">
-						<path class="edge" d="M 0 0 V -13.925 H 0"/>
+						<path class="edge root" d="M 0 0 V -13.925 H 0"/>
 						<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 						<text class="lab" transform="translate(0 11)">2</text>
 					</g>
 					<g class="leaf node n3 p0 root sample" transform="translate(62 121.4)">
-						<path class="edge" d="M 0 0 V -13.925 H 0"/>
+						<path class="edge root" d="M 0 0 V -13.925 H 0"/>
 						<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 						<text class="lab" transform="translate(0 11)">3</text>
 					</g>
 					<g class="leaf node n4 p0 root sample" transform="translate(74 121.4)">
-						<path class="edge" d="M 0 0 V -13.925 H 0"/>
+						<path class="edge root" d="M 0 0 V -13.925 H 0"/>
 						<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 						<text class="lab" transform="translate(0 11)">4</text>
 					</g>
 					<g class="leaf m0 node n5 p0 root s0 sample" transform="translate(86 121.4)">
-						<path class="edge" d="M 0 0 V -13.925 H 0"/>
+						<path class="edge root" d="M 0 0 V -13.925 H 0"/>
 						<g class="mut m0 s0 unknown_time" transform="translate(0 -6.9625)">
 							<line x1="0" x2="0" y1="0" y2="6.9625"/>
 							<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -92,12 +92,12 @@
 						<text class="lab" transform="translate(0 11)">5</text>
 					</g>
 					<g class="leaf node n6 p0 root sample" transform="translate(98 121.4)">
-						<path class="edge" d="M 0 0 V -13.925 H 0"/>
+						<path class="edge root" d="M 0 0 V -13.925 H 0"/>
 						<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 						<text class="lab" transform="translate(0 11)">6</text>
 					</g>
 					<g class="leaf m3 node n7 p0 root s3 sample" transform="translate(110 121.4)">
-						<path class="edge" d="M 0 0 V -13.925 H 0"/>
+						<path class="edge root" d="M 0 0 V -13.925 H 0"/>
 						<g class="mut m3 s3 unknown_time" transform="translate(0 -6.9625)">
 							<line x1="0" x2="0" y1="0" y2="6.9625"/>
 							<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -107,12 +107,12 @@
 						<text class="lab" transform="translate(0 11)">7</text>
 					</g>
 					<g class="leaf node n8 p0 root sample" transform="translate(122 121.4)">
-						<path class="edge" d="M 0 0 V -13.925 H 0"/>
+						<path class="edge root" d="M 0 0 V -13.925 H 0"/>
 						<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 						<text class="lab" transform="translate(0 11)">8</text>
 					</g>
 					<g class="leaf node n9 p0 root sample" transform="translate(134 121.4)">
-						<path class="edge" d="M 0 0 V -13.925 H 0"/>
+						<path class="edge root" d="M 0 0 V -13.925 H 0"/>
 						<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 						<text class="lab" transform="translate(0 11)">9</text>
 					</g>
diff --git a/python/tests/data/svg/ts_mutations_timed_no_edges.svg b/python/tests/data/svg/ts_mutations_timed_no_edges.svg
index c4f5dfa42b..f7b70eb646 100644
--- a/python/tests/data/svg/ts_mutations_timed_no_edges.svg
+++ b/python/tests/data/svg/ts_mutations_timed_no_edges.svg
@@ -57,32 +57,32 @@
 			<g class="tree t0" transform="translate(20 0)">
 				<g class="plotbox">
 					<g class="leaf node n0 p0 root sample" transform="translate(26 121.4)">
-						<path class="edge" d="M 0 0 V -13.925 H 0"/>
+						<path class="edge root" d="M 0 0 V -13.925 H 0"/>
 						<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 						<text class="lab" transform="translate(0 11)">0</text>
 					</g>
 					<g class="leaf node n1 p0 root sample" transform="translate(38 121.4)">
-						<path class="edge" d="M 0 0 V -13.925 H 0"/>
+						<path class="edge root" d="M 0 0 V -13.925 H 0"/>
 						<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 						<text class="lab" transform="translate(0 11)">1</text>
 					</g>
 					<g class="leaf node n2 p0 root sample" transform="translate(50 121.4)">
-						<path class="edge" d="M 0 0 V -13.925 H 0"/>
+						<path class="edge root" d="M 0 0 V -13.925 H 0"/>
 						<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 						<text class="lab" transform="translate(0 11)">2</text>
 					</g>
 					<g class="leaf node n3 p0 root sample" transform="translate(62 121.4)">
-						<path class="edge" d="M 0 0 V -13.925 H 0"/>
+						<path class="edge root" d="M 0 0 V -13.925 H 0"/>
 						<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 						<text class="lab" transform="translate(0 11)">3</text>
 					</g>
 					<g class="leaf node n4 p0 root sample" transform="translate(74 121.4)">
-						<path class="edge" d="M 0 0 V -13.925 H 0"/>
+						<path class="edge root" d="M 0 0 V -13.925 H 0"/>
 						<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 						<text class="lab" transform="translate(0 11)">4</text>
 					</g>
 					<g class="leaf m0 node n5 p0 root s0 sample" transform="translate(86 121.4)">
-						<path class="edge" d="M 0 0 V -13.925 H 0"/>
+						<path class="edge root" d="M 0 0 V -13.925 H 0"/>
 						<g class="mut m0 s0" transform="translate(0 0.0)">
 							<line x1="0" x2="0" y1="0" y2="-0.0"/>
 							<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -92,12 +92,12 @@
 						<text class="lab" transform="translate(0 11)">5</text>
 					</g>
 					<g class="leaf node n6 p0 root sample" transform="translate(98 121.4)">
-						<path class="edge" d="M 0 0 V -13.925 H 0"/>
+						<path class="edge root" d="M 0 0 V -13.925 H 0"/>
 						<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 						<text class="lab" transform="translate(0 11)">6</text>
 					</g>
 					<g class="leaf m3 node n7 p0 root s3 sample" transform="translate(110 121.4)">
-						<path class="edge" d="M 0 0 V -111.4 H 0"/>
+						<path class="edge root" d="M 0 0 V -111.4 H 0"/>
 						<g class="mut m3 s3" transform="translate(0 -111.4)">
 							<line x1="0" x2="0" y1="0" y2="111.4"/>
 							<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -107,12 +107,12 @@
 						<text class="lab" transform="translate(0 11)">7</text>
 					</g>
 					<g class="leaf node n8 p0 root sample" transform="translate(122 121.4)">
-						<path class="edge" d="M 0 0 V -13.925 H 0"/>
+						<path class="edge root" d="M 0 0 V -13.925 H 0"/>
 						<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 						<text class="lab" transform="translate(0 11)">8</text>
 					</g>
 					<g class="leaf node n9 p0 root sample" transform="translate(134 121.4)">
-						<path class="edge" d="M 0 0 V -13.925 H 0"/>
+						<path class="edge root" d="M 0 0 V -13.925 H 0"/>
 						<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 						<text class="lab" transform="translate(0 11)">9</text>
 					</g>
diff --git a/python/tests/data/svg/ts_no_axes.svg b/python/tests/data/svg/ts_no_axes.svg
index d1674bb7cc..7539ef9054 100644
--- a/python/tests/data/svg/ts_no_axes.svg
+++ b/python/tests/data/svg/ts_no_axes.svg
@@ -10,31 +10,31 @@
 					<g class="c2 m0 m1 node n9 p0 root s0" transform="translate(96 26.4667)">
 						<g class="a9 c2 node n4 p0" transform="translate(-38 130.073)">
 							<g class="a4 leaf node n0 p0 sample" transform="translate(-19 1.66063)">
-								<path class="edge" d="M 0 0 V -1.66063 H 19"/>
+								<path class="edge e0" d="M 0 0 V -1.66063 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">0</text>
 							</g>
 							<g class="a4 leaf node n1 p0 sample" transform="translate(19 1.66063)">
-								<path class="edge" d="M 0 0 V -1.66063 H -19"/>
+								<path class="edge e1" d="M 0 0 V -1.66063 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
-							<path class="edge" d="M 0 0 V -130.073 H 38"/>
+							<path class="edge e12" d="M 0 0 V -130.073 H 38"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab lft" transform="translate(-3 -7)">4</text>
 						</g>
 						<g class="a9 c2 m2 node n5 p0 s0" transform="translate(38 115.625)">
 							<g class="a5 leaf node n2 p0 sample" transform="translate(-19 16.1084)">
-								<path class="edge" d="M 0 0 V -16.1084 H 19"/>
+								<path class="edge e2" d="M 0 0 V -16.1084 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">2</text>
 							</g>
 							<g class="a5 leaf node n3 p0 sample" transform="translate(19 16.1084)">
-								<path class="edge" d="M 0 0 V -16.1084 H -19"/>
+								<path class="edge e3" d="M 0 0 V -16.1084 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">3</text>
 							</g>
-							<path class="edge" d="M 0 0 V -115.625 H -38"/>
+							<path class="edge e13" d="M 0 0 V -115.625 H -38"/>
 							<g class="mut m2 s0 unknown_time" transform="translate(0 -57.8125)">
 								<line x1="0" x2="0" y1="0" y2="57.8125"/>
 								<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -43,7 +43,7 @@
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab rgt" transform="translate(3 -7)">5</text>
 						</g>
-						<path class="edge" d="M 0 0 V -16.4667 H 0"/>
+						<path class="edge root" d="M 0 0 V -16.4667 H 0"/>
 						<g class="mut m0 s0 unknown_time" transform="translate(0 -10.9778)">
 							<line x1="0" x2="0" y1="0" y2="10.9778"/>
 							<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -64,16 +64,16 @@
 					<g class="c2 m5 node n7 p0 root s2" transform="translate(96 81.1785)">
 						<g class="a7 c2 m3 m4 node n4 p0 s1" transform="translate(-38 75.3608)">
 							<g class="a4 leaf node n0 p0 sample" transform="translate(-19 1.66063)">
-								<path class="edge" d="M 0 0 V -1.66063 H 19"/>
+								<path class="edge e0" d="M 0 0 V -1.66063 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">0</text>
 							</g>
 							<g class="a4 leaf node n1 p0 sample" transform="translate(19 1.66063)">
-								<path class="edge" d="M 0 0 V -1.66063 H -19"/>
+								<path class="edge e1" d="M 0 0 V -1.66063 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
-							<path class="edge" d="M 0 0 V -75.3608 H 38"/>
+							<path class="edge e6" d="M 0 0 V -75.3608 H 38"/>
 							<g class="mut m3 s1 unknown_time" transform="translate(0 -50.2406)">
 								<line x1="0" x2="0" y1="0" y2="50.2406"/>
 								<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -89,12 +89,12 @@
 						</g>
 						<g class="a7 c2 node n5 p0" transform="translate(38 60.9131)">
 							<g class="a5 leaf node n2 p0 sample" transform="translate(-19 16.1084)">
-								<path class="edge" d="M 0 0 V -16.1084 H 19"/>
+								<path class="edge e2" d="M 0 0 V -16.1084 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">2</text>
 							</g>
 							<g class="a5 leaf m6 node n3 p0 s2 sample" transform="translate(19 16.1084)">
-								<path class="edge" d="M 0 0 V -16.1084 H -19"/>
+								<path class="edge e3" d="M 0 0 V -16.1084 H -19"/>
 								<g class="mut m6 s2 unknown_time" transform="translate(0 -8.05418)">
 									<line x1="0" x2="0" y1="0" y2="8.05418"/>
 									<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -103,11 +103,11 @@
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">3</text>
 							</g>
-							<path class="edge" d="M 0 0 V -60.9131 H -38"/>
+							<path class="edge e8" d="M 0 0 V -60.9131 H -38"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab rgt" transform="translate(3 -7)">5</text>
 						</g>
-						<path class="edge" d="M 0 0 V -16.4667 H 0"/>
+						<path class="edge root" d="M 0 0 V -16.4667 H 0"/>
 						<g class="mut m5 s2 unknown_time" transform="translate(0 -8.23333)">
 							<line x1="0" x2="0" y1="0" y2="8.23333"/>
 							<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -123,35 +123,35 @@
 					<g class="c2 node n6 p0 root" transform="translate(96 132.819)">
 						<g class="a6 c2 node n4 p0" transform="translate(-38 23.7206)">
 							<g class="a4 leaf node n0 p0 sample" transform="translate(-19 1.66063)">
-								<path class="edge" d="M 0 0 V -1.66063 H 19"/>
+								<path class="edge e0" d="M 0 0 V -1.66063 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">0</text>
 							</g>
 							<g class="a4 leaf node n1 p0 sample" transform="translate(19 1.66063)">
-								<path class="edge" d="M 0 0 V -1.66063 H -19"/>
+								<path class="edge e1" d="M 0 0 V -1.66063 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
-							<path class="edge" d="M 0 0 V -23.7206 H 38"/>
+							<path class="edge e4" d="M 0 0 V -23.7206 H 38"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab lft" transform="translate(-3 -7)">4</text>
 						</g>
 						<g class="a6 c2 node n5 p0" transform="translate(38 9.27292)">
 							<g class="a5 leaf node n2 p0 sample" transform="translate(-19 16.1084)">
-								<path class="edge" d="M 0 0 V -16.1084 H 19"/>
+								<path class="edge e2" d="M 0 0 V -16.1084 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">2</text>
 							</g>
 							<g class="a5 leaf node n3 p0 sample" transform="translate(19 16.1084)">
-								<path class="edge" d="M 0 0 V -16.1084 H -19"/>
+								<path class="edge e3" d="M 0 0 V -16.1084 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">3</text>
 							</g>
-							<path class="edge" d="M 0 0 V -9.27292 H -38"/>
+							<path class="edge e5" d="M 0 0 V -9.27292 H -38"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab rgt" transform="translate(3 -7)">5</text>
 						</g>
-						<path class="edge" d="M 0 0 V -16.4667 H 0"/>
+						<path class="edge root" d="M 0 0 V -16.4667 H 0"/>
 						<circle class="sym" cx="0" cy="0" r="3"/>
 						<text class="lab rgt" transform="translate(3 -7)">6</text>
 					</g>
@@ -162,27 +162,27 @@
 					<g class="c2 node n7 p0 root" transform="translate(96 81.1785)">
 						<g class="a7 c2 node n4 p0" transform="translate(-38 75.3608)">
 							<g class="a4 leaf node n0 p0 sample" transform="translate(-19 1.66063)">
-								<path class="edge" d="M 0 0 V -1.66063 H 19"/>
+								<path class="edge e0" d="M 0 0 V -1.66063 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">0</text>
 							</g>
 							<g class="a4 leaf node n1 p0 sample" transform="translate(19 1.66063)">
-								<path class="edge" d="M 0 0 V -1.66063 H -19"/>
+								<path class="edge e1" d="M 0 0 V -1.66063 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
-							<path class="edge" d="M 0 0 V -75.3608 H 38"/>
+							<path class="edge e7" d="M 0 0 V -75.3608 H 38"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab lft" transform="translate(-3 -7)">4</text>
 						</g>
 						<g class="a7 c2 node n5 p0" transform="translate(38 60.9131)">
 							<g class="a5 leaf node n2 p0 sample" transform="translate(-19 16.1084)">
-								<path class="edge" d="M 0 0 V -16.1084 H 19"/>
+								<path class="edge e2" d="M 0 0 V -16.1084 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">2</text>
 							</g>
 							<g class="a5 leaf m7 node n3 p0 s4 sample" transform="translate(19 16.1084)">
-								<path class="edge" d="M 0 0 V -16.1084 H -19"/>
+								<path class="edge e3" d="M 0 0 V -16.1084 H -19"/>
 								<g class="mut m7 s4 unknown_time" transform="translate(0 -8.05418)">
 									<line x1="0" x2="0" y1="0" y2="8.05418"/>
 									<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -191,11 +191,11 @@
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">3</text>
 							</g>
-							<path class="edge" d="M 0 0 V -60.9131 H -38"/>
+							<path class="edge e9" d="M 0 0 V -60.9131 H -38"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab rgt" transform="translate(3 -7)">5</text>
 						</g>
-						<path class="edge" d="M 0 0 V -16.4667 H 0"/>
+						<path class="edge root" d="M 0 0 V -16.4667 H 0"/>
 						<circle class="sym" cx="0" cy="0" r="3"/>
 						<text class="lab rgt" transform="translate(3 -7)">7</text>
 					</g>
@@ -206,35 +206,35 @@
 					<g class="c2 node n8 p0 root" transform="translate(96 62.8662)">
 						<g class="a8 c2 node n4 p0" transform="translate(-38 93.6731)">
 							<g class="a4 leaf node n0 p0 sample" transform="translate(-19 1.66063)">
-								<path class="edge" d="M 0 0 V -1.66063 H 19"/>
+								<path class="edge e0" d="M 0 0 V -1.66063 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">0</text>
 							</g>
 							<g class="a4 leaf node n1 p0 sample" transform="translate(19 1.66063)">
-								<path class="edge" d="M 0 0 V -1.66063 H -19"/>
+								<path class="edge e1" d="M 0 0 V -1.66063 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
-							<path class="edge" d="M 0 0 V -93.6731 H 38"/>
+							<path class="edge e10" d="M 0 0 V -93.6731 H 38"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab lft" transform="translate(-3 -7)">4</text>
 						</g>
 						<g class="a8 c2 node n5 p0" transform="translate(38 79.2254)">
 							<g class="a5 leaf node n2 p0 sample" transform="translate(-19 16.1084)">
-								<path class="edge" d="M 0 0 V -16.1084 H 19"/>
+								<path class="edge e2" d="M 0 0 V -16.1084 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">2</text>
 							</g>
 							<g class="a5 leaf node n3 p0 sample" transform="translate(19 16.1084)">
-								<path class="edge" d="M 0 0 V -16.1084 H -19"/>
+								<path class="edge e3" d="M 0 0 V -16.1084 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">3</text>
 							</g>
-							<path class="edge" d="M 0 0 V -79.2254 H -38"/>
+							<path class="edge e11" d="M 0 0 V -79.2254 H -38"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab rgt" transform="translate(3 -7)">5</text>
 						</g>
-						<path class="edge" d="M 0 0 V -16.4667 H 0"/>
+						<path class="edge root" d="M 0 0 V -16.4667 H 0"/>
 						<circle class="sym" cx="0" cy="0" r="3"/>
 						<text class="lab rgt" transform="translate(3 -7)">8</text>
 					</g>
diff --git a/python/tests/data/svg/ts_plain.svg b/python/tests/data/svg/ts_plain.svg
index eab1a91be1..4e752e291f 100644
--- a/python/tests/data/svg/ts_plain.svg
+++ b/python/tests/data/svg/ts_plain.svg
@@ -56,31 +56,31 @@
 					<g class="c2 m0 m1 node n9 p0 root s0" transform="translate(96 22.3778)">
 						<g class="a9 c2 node n4 p0" transform="translate(-38 97.7739)">
 							<g class="a4 leaf node n0 p0 sample" transform="translate(-19 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H 19"/>
+								<path class="edge e0" d="M 0 0 V -1.24828 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">0</text>
 							</g>
 							<g class="a4 leaf node n1 p0 sample" transform="translate(19 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H -19"/>
+								<path class="edge e1" d="M 0 0 V -1.24828 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
-							<path class="edge" d="M 0 0 V -97.7739 H 38"/>
+							<path class="edge e12" d="M 0 0 V -97.7739 H 38"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab lft" transform="translate(-3 -7)">4</text>
 						</g>
 						<g class="a9 c2 m2 node n5 p0 s0" transform="translate(38 86.9138)">
 							<g class="a5 leaf node n2 p0 sample" transform="translate(-19 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H 19"/>
+								<path class="edge e2" d="M 0 0 V -12.1084 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">2</text>
 							</g>
 							<g class="a5 leaf node n3 p0 sample" transform="translate(19 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H -19"/>
+								<path class="edge e3" d="M 0 0 V -12.1084 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">3</text>
 							</g>
-							<path class="edge" d="M 0 0 V -86.9138 H -38"/>
+							<path class="edge e13" d="M 0 0 V -86.9138 H -38"/>
 							<g class="mut m2 s0 unknown_time" transform="translate(0 -43.4569)">
 								<line x1="0" x2="0" y1="0" y2="43.4569"/>
 								<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -89,7 +89,7 @@
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab rgt" transform="translate(3 -7)">5</text>
 						</g>
-						<path class="edge" d="M 0 0 V -12.3778 H 0"/>
+						<path class="edge root" d="M 0 0 V -12.3778 H 0"/>
 						<g class="mut m0 s0 unknown_time" transform="translate(0 -8.25185)">
 							<line x1="0" x2="0" y1="0" y2="8.25185"/>
 							<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -110,16 +110,16 @@
 					<g class="c2 m5 node n7 p0 root s2" transform="translate(96 63.504)">
 						<g class="a7 c2 m3 m4 node n4 p0 s1" transform="translate(-38 56.6478)">
 							<g class="a4 leaf node n0 p0 sample" transform="translate(-19 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H 19"/>
+								<path class="edge e0" d="M 0 0 V -1.24828 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">0</text>
 							</g>
 							<g class="a4 leaf node n1 p0 sample" transform="translate(19 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H -19"/>
+								<path class="edge e1" d="M 0 0 V -1.24828 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
-							<path class="edge" d="M 0 0 V -56.6478 H 38"/>
+							<path class="edge e6" d="M 0 0 V -56.6478 H 38"/>
 							<g class="mut m3 s1 unknown_time" transform="translate(0 -37.7652)">
 								<line x1="0" x2="0" y1="0" y2="37.7652"/>
 								<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -135,12 +135,12 @@
 						</g>
 						<g class="a7 c2 node n5 p0" transform="translate(38 45.7876)">
 							<g class="a5 leaf node n2 p0 sample" transform="translate(-19 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H 19"/>
+								<path class="edge e2" d="M 0 0 V -12.1084 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">2</text>
 							</g>
 							<g class="a5 leaf m6 node n3 p0 s2 sample" transform="translate(19 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H -19"/>
+								<path class="edge e3" d="M 0 0 V -12.1084 H -19"/>
 								<g class="mut m6 s2 unknown_time" transform="translate(0 -6.05422)">
 									<line x1="0" x2="0" y1="0" y2="6.05422"/>
 									<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -149,11 +149,11 @@
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">3</text>
 							</g>
-							<path class="edge" d="M 0 0 V -45.7876 H -38"/>
+							<path class="edge e8" d="M 0 0 V -45.7876 H -38"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab rgt" transform="translate(3 -7)">5</text>
 						</g>
-						<path class="edge" d="M 0 0 V -12.3778 H 0"/>
+						<path class="edge root" d="M 0 0 V -12.3778 H 0"/>
 						<g class="mut m5 s2 unknown_time" transform="translate(0 -6.18889)">
 							<line x1="0" x2="0" y1="0" y2="6.18889"/>
 							<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -169,35 +169,35 @@
 					<g class="c2 node n6 p0 root" transform="translate(96 102.321)">
 						<g class="a6 c2 node n4 p0" transform="translate(-38 17.8305)">
 							<g class="a4 leaf node n0 p0 sample" transform="translate(-19 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H 19"/>
+								<path class="edge e0" d="M 0 0 V -1.24828 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">0</text>
 							</g>
 							<g class="a4 leaf node n1 p0 sample" transform="translate(19 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H -19"/>
+								<path class="edge e1" d="M 0 0 V -1.24828 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
-							<path class="edge" d="M 0 0 V -17.8305 H 38"/>
+							<path class="edge e4" d="M 0 0 V -17.8305 H 38"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab lft" transform="translate(-3 -7)">4</text>
 						</g>
 						<g class="a6 c2 node n5 p0" transform="translate(38 6.97033)">
 							<g class="a5 leaf node n2 p0 sample" transform="translate(-19 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H 19"/>
+								<path class="edge e2" d="M 0 0 V -12.1084 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">2</text>
 							</g>
 							<g class="a5 leaf node n3 p0 sample" transform="translate(19 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H -19"/>
+								<path class="edge e3" d="M 0 0 V -12.1084 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">3</text>
 							</g>
-							<path class="edge" d="M 0 0 V -6.97033 H -38"/>
+							<path class="edge e5" d="M 0 0 V -6.97033 H -38"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab rgt" transform="translate(3 -7)">5</text>
 						</g>
-						<path class="edge" d="M 0 0 V -12.3778 H 0"/>
+						<path class="edge root" d="M 0 0 V -12.3778 H 0"/>
 						<circle class="sym" cx="0" cy="0" r="3"/>
 						<text class="lab rgt" transform="translate(3 -7)">6</text>
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@@ -208,27 +208,27 @@
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 						<g class="a7 c2 node n4 p0" transform="translate(-38 56.6478)">
 							<g class="a4 leaf node n0 p0 sample" transform="translate(-19 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H 19"/>
+								<path class="edge e0" d="M 0 0 V -1.24828 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">0</text>
 							</g>
 							<g class="a4 leaf node n1 p0 sample" transform="translate(19 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H -19"/>
+								<path class="edge e1" d="M 0 0 V -1.24828 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
-							<path class="edge" d="M 0 0 V -56.6478 H 38"/>
+							<path class="edge e7" d="M 0 0 V -56.6478 H 38"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab lft" transform="translate(-3 -7)">4</text>
 						</g>
 						<g class="a7 c2 node n5 p0" transform="translate(38 45.7876)">
 							<g class="a5 leaf node n2 p0 sample" transform="translate(-19 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H 19"/>
+								<path class="edge e2" d="M 0 0 V -12.1084 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">2</text>
 							</g>
 							<g class="a5 leaf m7 node n3 p0 s4 sample" transform="translate(19 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H -19"/>
+								<path class="edge e3" d="M 0 0 V -12.1084 H -19"/>
 								<g class="mut m7 s4 unknown_time" transform="translate(0 -6.05422)">
 									<line x1="0" x2="0" y1="0" y2="6.05422"/>
 									<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -237,11 +237,11 @@
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">3</text>
 							</g>
-							<path class="edge" d="M 0 0 V -45.7876 H -38"/>
+							<path class="edge e9" d="M 0 0 V -45.7876 H -38"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab rgt" transform="translate(3 -7)">5</text>
 						</g>
-						<path class="edge" d="M 0 0 V -12.3778 H 0"/>
+						<path class="edge root" d="M 0 0 V -12.3778 H 0"/>
 						<circle class="sym" cx="0" cy="0" r="3"/>
 						<text class="lab rgt" transform="translate(3 -7)">7</text>
 					</g>
@@ -252,35 +252,35 @@
 					<g class="c2 node n8 p0 root" transform="translate(96 49.7389)">
 						<g class="a8 c2 node n4 p0" transform="translate(-38 70.4129)">
 							<g class="a4 leaf node n0 p0 sample" transform="translate(-19 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H 19"/>
+								<path class="edge e0" d="M 0 0 V -1.24828 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">0</text>
 							</g>
 							<g class="a4 leaf node n1 p0 sample" transform="translate(19 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H -19"/>
+								<path class="edge e1" d="M 0 0 V -1.24828 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
-							<path class="edge" d="M 0 0 V -70.4129 H 38"/>
+							<path class="edge e10" d="M 0 0 V -70.4129 H 38"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab lft" transform="translate(-3 -7)">4</text>
 						</g>
 						<g class="a8 c2 node n5 p0" transform="translate(38 59.5527)">
 							<g class="a5 leaf node n2 p0 sample" transform="translate(-19 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H 19"/>
+								<path class="edge e2" d="M 0 0 V -12.1084 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">2</text>
 							</g>
 							<g class="a5 leaf node n3 p0 sample" transform="translate(19 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H -19"/>
+								<path class="edge e3" d="M 0 0 V -12.1084 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">3</text>
 							</g>
-							<path class="edge" d="M 0 0 V -59.5527 H -38"/>
+							<path class="edge e11" d="M 0 0 V -59.5527 H -38"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab rgt" transform="translate(3 -7)">5</text>
 						</g>
-						<path class="edge" d="M 0 0 V -12.3778 H 0"/>
+						<path class="edge root" d="M 0 0 V -12.3778 H 0"/>
 						<circle class="sym" cx="0" cy="0" r="3"/>
 						<text class="lab rgt" transform="translate(3 -7)">8</text>
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diff --git a/python/tests/data/svg/ts_plain_no_xlab.svg b/python/tests/data/svg/ts_plain_no_xlab.svg
index c17c1fb425..2a339f00a6 100644
--- a/python/tests/data/svg/ts_plain_no_xlab.svg
+++ b/python/tests/data/svg/ts_plain_no_xlab.svg
@@ -53,31 +53,31 @@
 					<g class="c2 m0 m1 node n9 p0 root s0" transform="translate(96 24.2444)">
 						<g class="a9 c2 node n4 p0" transform="translate(-38 112.519)">
 							<g class="a4 leaf node n0 p0 sample" transform="translate(-19 1.43653)">
-								<path class="edge" d="M 0 0 V -1.43653 H 19"/>
+								<path class="edge e0" d="M 0 0 V -1.43653 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">0</text>
 							</g>
 							<g class="a4 leaf node n1 p0 sample" transform="translate(19 1.43653)">
-								<path class="edge" d="M 0 0 V -1.43653 H -19"/>
+								<path class="edge e1" d="M 0 0 V -1.43653 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
-							<path class="edge" d="M 0 0 V -112.519 H 38"/>
+							<path class="edge e12" d="M 0 0 V -112.519 H 38"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab lft" transform="translate(-3 -7)">4</text>
 						</g>
 						<g class="a9 c2 m2 node n5 p0 s0" transform="translate(38 100.021)">
 							<g class="a5 leaf node n2 p0 sample" transform="translate(-19 13.9345)">
-								<path class="edge" d="M 0 0 V -13.9345 H 19"/>
+								<path class="edge e2" d="M 0 0 V -13.9345 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">2</text>
 							</g>
 							<g class="a5 leaf node n3 p0 sample" transform="translate(19 13.9345)">
-								<path class="edge" d="M 0 0 V -13.9345 H -19"/>
+								<path class="edge e3" d="M 0 0 V -13.9345 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">3</text>
 							</g>
-							<path class="edge" d="M 0 0 V -100.021 H -38"/>
+							<path class="edge e13" d="M 0 0 V -100.021 H -38"/>
 							<g class="mut m2 s0 unknown_time" transform="translate(0 -50.0105)">
 								<line x1="0" x2="0" y1="0" y2="50.0105"/>
 								<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -86,7 +86,7 @@
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab rgt" transform="translate(3 -7)">5</text>
 						</g>
-						<path class="edge" d="M 0 0 V -14.2444 H 0"/>
+						<path class="edge root" d="M 0 0 V -14.2444 H 0"/>
 						<g class="mut m0 s0 unknown_time" transform="translate(0 -9.4963)">
 							<line x1="0" x2="0" y1="0" y2="9.4963"/>
 							<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -107,16 +107,16 @@
 					<g class="c2 m5 node n7 p0 root s2" transform="translate(96 71.5728)">
 						<g class="a7 c2 m3 m4 node n4 p0 s1" transform="translate(-38 65.1907)">
 							<g class="a4 leaf node n0 p0 sample" transform="translate(-19 1.43653)">
-								<path class="edge" d="M 0 0 V -1.43653 H 19"/>
+								<path class="edge e0" d="M 0 0 V -1.43653 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">0</text>
 							</g>
 							<g class="a4 leaf node n1 p0 sample" transform="translate(19 1.43653)">
-								<path class="edge" d="M 0 0 V -1.43653 H -19"/>
+								<path class="edge e1" d="M 0 0 V -1.43653 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
-							<path class="edge" d="M 0 0 V -65.1907 H 38"/>
+							<path class="edge e6" d="M 0 0 V -65.1907 H 38"/>
 							<g class="mut m3 s1 unknown_time" transform="translate(0 -43.4605)">
 								<line x1="0" x2="0" y1="0" y2="43.4605"/>
 								<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -132,12 +132,12 @@
 						</g>
 						<g class="a7 c2 node n5 p0" transform="translate(38 52.6927)">
 							<g class="a5 leaf node n2 p0 sample" transform="translate(-19 13.9345)">
-								<path class="edge" d="M 0 0 V -13.9345 H 19"/>
+								<path class="edge e2" d="M 0 0 V -13.9345 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">2</text>
 							</g>
 							<g class="a5 leaf m6 node n3 p0 s2 sample" transform="translate(19 13.9345)">
-								<path class="edge" d="M 0 0 V -13.9345 H -19"/>
+								<path class="edge e3" d="M 0 0 V -13.9345 H -19"/>
 								<g class="mut m6 s2 unknown_time" transform="translate(0 -6.96724)">
 									<line x1="0" x2="0" y1="0" y2="6.96724"/>
 									<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -146,11 +146,11 @@
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">3</text>
 							</g>
-							<path class="edge" d="M 0 0 V -52.6927 H -38"/>
+							<path class="edge e8" d="M 0 0 V -52.6927 H -38"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab rgt" transform="translate(3 -7)">5</text>
 						</g>
-						<path class="edge" d="M 0 0 V -14.2444 H 0"/>
+						<path class="edge root" d="M 0 0 V -14.2444 H 0"/>
 						<g class="mut m5 s2 unknown_time" transform="translate(0 -7.12222)">
 							<line x1="0" x2="0" y1="0" y2="7.12222"/>
 							<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -166,35 +166,35 @@
 					<g class="c2 node n6 p0 root" transform="translate(96 116.244)">
 						<g class="a6 c2 node n4 p0" transform="translate(-38 20.5195)">
 							<g class="a4 leaf node n0 p0 sample" transform="translate(-19 1.43653)">
-								<path class="edge" d="M 0 0 V -1.43653 H 19"/>
+								<path class="edge e0" d="M 0 0 V -1.43653 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">0</text>
 							</g>
 							<g class="a4 leaf node n1 p0 sample" transform="translate(19 1.43653)">
-								<path class="edge" d="M 0 0 V -1.43653 H -19"/>
+								<path class="edge e1" d="M 0 0 V -1.43653 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
-							<path class="edge" d="M 0 0 V -20.5195 H 38"/>
+							<path class="edge e4" d="M 0 0 V -20.5195 H 38"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab lft" transform="translate(-3 -7)">4</text>
 						</g>
 						<g class="a6 c2 node n5 p0" transform="translate(38 8.02152)">
 							<g class="a5 leaf node n2 p0 sample" transform="translate(-19 13.9345)">
-								<path class="edge" d="M 0 0 V -13.9345 H 19"/>
+								<path class="edge e2" d="M 0 0 V -13.9345 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">2</text>
 							</g>
 							<g class="a5 leaf node n3 p0 sample" transform="translate(19 13.9345)">
-								<path class="edge" d="M 0 0 V -13.9345 H -19"/>
+								<path class="edge e3" d="M 0 0 V -13.9345 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">3</text>
 							</g>
-							<path class="edge" d="M 0 0 V -8.02152 H -38"/>
+							<path class="edge e5" d="M 0 0 V -8.02152 H -38"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab rgt" transform="translate(3 -7)">5</text>
 						</g>
-						<path class="edge" d="M 0 0 V -14.2444 H 0"/>
+						<path class="edge root" d="M 0 0 V -14.2444 H 0"/>
 						<circle class="sym" cx="0" cy="0" r="3"/>
 						<text class="lab rgt" transform="translate(3 -7)">6</text>
 					</g>
@@ -205,27 +205,27 @@
 					<g class="c2 node n7 p0 root" transform="translate(96 71.5728)">
 						<g class="a7 c2 node n4 p0" transform="translate(-38 65.1907)">
 							<g class="a4 leaf node n0 p0 sample" transform="translate(-19 1.43653)">
-								<path class="edge" d="M 0 0 V -1.43653 H 19"/>
+								<path class="edge e0" d="M 0 0 V -1.43653 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">0</text>
 							</g>
 							<g class="a4 leaf node n1 p0 sample" transform="translate(19 1.43653)">
-								<path class="edge" d="M 0 0 V -1.43653 H -19"/>
+								<path class="edge e1" d="M 0 0 V -1.43653 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
-							<path class="edge" d="M 0 0 V -65.1907 H 38"/>
+							<path class="edge e7" d="M 0 0 V -65.1907 H 38"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab lft" transform="translate(-3 -7)">4</text>
 						</g>
 						<g class="a7 c2 node n5 p0" transform="translate(38 52.6927)">
 							<g class="a5 leaf node n2 p0 sample" transform="translate(-19 13.9345)">
-								<path class="edge" d="M 0 0 V -13.9345 H 19"/>
+								<path class="edge e2" d="M 0 0 V -13.9345 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">2</text>
 							</g>
 							<g class="a5 leaf m7 node n3 p0 s4 sample" transform="translate(19 13.9345)">
-								<path class="edge" d="M 0 0 V -13.9345 H -19"/>
+								<path class="edge e3" d="M 0 0 V -13.9345 H -19"/>
 								<g class="mut m7 s4 unknown_time" transform="translate(0 -6.96724)">
 									<line x1="0" x2="0" y1="0" y2="6.96724"/>
 									<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -234,11 +234,11 @@
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">3</text>
 							</g>
-							<path class="edge" d="M 0 0 V -52.6927 H -38"/>
+							<path class="edge e9" d="M 0 0 V -52.6927 H -38"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab rgt" transform="translate(3 -7)">5</text>
 						</g>
-						<path class="edge" d="M 0 0 V -14.2444 H 0"/>
+						<path class="edge root" d="M 0 0 V -14.2444 H 0"/>
 						<circle class="sym" cx="0" cy="0" r="3"/>
 						<text class="lab rgt" transform="translate(3 -7)">7</text>
 					</g>
@@ -249,35 +249,35 @@
 					<g class="c2 node n8 p0 root" transform="translate(96 55.7318)">
 						<g class="a8 c2 node n4 p0" transform="translate(-38 81.0317)">
 							<g class="a4 leaf node n0 p0 sample" transform="translate(-19 1.43653)">
-								<path class="edge" d="M 0 0 V -1.43653 H 19"/>
+								<path class="edge e0" d="M 0 0 V -1.43653 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">0</text>
 							</g>
 							<g class="a4 leaf node n1 p0 sample" transform="translate(19 1.43653)">
-								<path class="edge" d="M 0 0 V -1.43653 H -19"/>
+								<path class="edge e1" d="M 0 0 V -1.43653 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
-							<path class="edge" d="M 0 0 V -81.0317 H 38"/>
+							<path class="edge e10" d="M 0 0 V -81.0317 H 38"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab lft" transform="translate(-3 -7)">4</text>
 						</g>
 						<g class="a8 c2 node n5 p0" transform="translate(38 68.5337)">
 							<g class="a5 leaf node n2 p0 sample" transform="translate(-19 13.9345)">
-								<path class="edge" d="M 0 0 V -13.9345 H 19"/>
+								<path class="edge e2" d="M 0 0 V -13.9345 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">2</text>
 							</g>
 							<g class="a5 leaf node n3 p0 sample" transform="translate(19 13.9345)">
-								<path class="edge" d="M 0 0 V -13.9345 H -19"/>
+								<path class="edge e3" d="M 0 0 V -13.9345 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">3</text>
 							</g>
-							<path class="edge" d="M 0 0 V -68.5337 H -38"/>
+							<path class="edge e11" d="M 0 0 V -68.5337 H -38"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab rgt" transform="translate(3 -7)">5</text>
 						</g>
-						<path class="edge" d="M 0 0 V -14.2444 H 0"/>
+						<path class="edge root" d="M 0 0 V -14.2444 H 0"/>
 						<circle class="sym" cx="0" cy="0" r="3"/>
 						<text class="lab rgt" transform="translate(3 -7)">8</text>
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diff --git a/python/tests/data/svg/ts_plain_y.svg b/python/tests/data/svg/ts_plain_y.svg
index 95c591307f..ca9ccd0eb3 100644
--- a/python/tests/data/svg/ts_plain_y.svg
+++ b/python/tests/data/svg/ts_plain_y.svg
@@ -85,31 +85,31 @@
 					<g class="c2 m0 m1 node n9 p0 root s0" transform="translate(92.32 22.3778)">
 						<g class="a9 c2 node n4 p0" transform="translate(-36.16 97.7739)">
 							<g class="a4 leaf node n0 p0 sample" transform="translate(-18.08 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H 18.08"/>
+								<path class="edge e0" d="M 0 0 V -1.24828 H 18.08"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">0</text>
 							</g>
 							<g class="a4 leaf node n1 p0 sample" transform="translate(18.08 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H -18.08"/>
+								<path class="edge e1" d="M 0 0 V -1.24828 H -18.08"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
-							<path class="edge" d="M 0 0 V -97.7739 H 36.16"/>
+							<path class="edge e12" d="M 0 0 V -97.7739 H 36.16"/>
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-								<path class="edge" d="M 0 0 V -12.1084 H 18.08"/>
+								<path class="edge e2" d="M 0 0 V -12.1084 H 18.08"/>
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-								<path class="edge" d="M 0 0 V -12.1084 H -18.08"/>
+								<path class="edge e3" d="M 0 0 V -12.1084 H -18.08"/>
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-							<path class="edge" d="M 0 0 V -86.9138 H -36.16"/>
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@@ -118,7 +118,7 @@
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-						<path class="edge" d="M 0 0 V -12.3778 H 0"/>
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@@ -139,16 +139,16 @@
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-								<path class="edge" d="M 0 0 V -1.24828 H 18.08"/>
+								<path class="edge e0" d="M 0 0 V -1.24828 H 18.08"/>
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-								<path class="edge" d="M 0 0 V -1.24828 H -18.08"/>
+								<path class="edge e1" d="M 0 0 V -1.24828 H -18.08"/>
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 								<text class="lab" transform="translate(0 11)">1</text>
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-							<path class="edge" d="M 0 0 V -56.6478 H 36.16"/>
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@@ -164,12 +164,12 @@
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 							<g class="a5 leaf node n2 p0 sample" transform="translate(-18.08 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H 18.08"/>
+								<path class="edge e2" d="M 0 0 V -12.1084 H 18.08"/>
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-								<path class="edge" d="M 0 0 V -12.1084 H -18.08"/>
+								<path class="edge e3" d="M 0 0 V -12.1084 H -18.08"/>
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@@ -178,11 +178,11 @@
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 								<text class="lab" transform="translate(0 11)">3</text>
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-							<path class="edge" d="M 0 0 V -45.7876 H -36.16"/>
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-						<path class="edge" d="M 0 0 V -12.3778 H 0"/>
+						<path class="edge root" d="M 0 0 V -12.3778 H 0"/>
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@@ -198,35 +198,35 @@
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 							<g class="a4 leaf node n0 p0 sample" transform="translate(-18.08 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H 18.08"/>
+								<path class="edge e0" d="M 0 0 V -1.24828 H 18.08"/>
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 								<text class="lab" transform="translate(0 11)">0</text>
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 							<g class="a4 leaf node n1 p0 sample" transform="translate(18.08 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H -18.08"/>
+								<path class="edge e1" d="M 0 0 V -1.24828 H -18.08"/>
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-							<path class="edge" d="M 0 0 V -17.8305 H 36.16"/>
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 							<g class="a5 leaf node n2 p0 sample" transform="translate(-18.08 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H 18.08"/>
+								<path class="edge e2" d="M 0 0 V -12.1084 H 18.08"/>
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-								<path class="edge" d="M 0 0 V -12.1084 H -18.08"/>
+								<path class="edge e3" d="M 0 0 V -12.1084 H -18.08"/>
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-							<path class="edge" d="M 0 0 V -6.97033 H -36.16"/>
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@@ -237,27 +237,27 @@
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 							<g class="a4 leaf node n0 p0 sample" transform="translate(-18.08 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H 18.08"/>
+								<path class="edge e0" d="M 0 0 V -1.24828 H 18.08"/>
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 								<text class="lab" transform="translate(0 11)">0</text>
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 							<g class="a4 leaf node n1 p0 sample" transform="translate(18.08 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H -18.08"/>
+								<path class="edge e1" d="M 0 0 V -1.24828 H -18.08"/>
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 								<text class="lab" transform="translate(0 11)">1</text>
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-							<path class="edge" d="M 0 0 V -56.6478 H 36.16"/>
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 							<g class="a5 leaf node n2 p0 sample" transform="translate(-18.08 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H 18.08"/>
+								<path class="edge e2" d="M 0 0 V -12.1084 H 18.08"/>
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-								<path class="edge" d="M 0 0 V -12.1084 H -18.08"/>
+								<path class="edge e3" d="M 0 0 V -12.1084 H -18.08"/>
 								<g class="mut m7 s4 unknown_time" transform="translate(0 -6.05422)">
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@@ -266,11 +266,11 @@
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 								<text class="lab" transform="translate(0 11)">3</text>
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-							<path class="edge" d="M 0 0 V -45.7876 H -36.16"/>
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+						<path class="edge root" d="M 0 0 V -12.3778 H 0"/>
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@@ -281,35 +281,35 @@
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-								<path class="edge" d="M 0 0 V -1.24828 H 18.08"/>
+								<path class="edge e0" d="M 0 0 V -1.24828 H 18.08"/>
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 								<text class="lab" transform="translate(0 11)">0</text>
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 							<g class="a4 leaf node n1 p0 sample" transform="translate(18.08 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H -18.08"/>
+								<path class="edge e1" d="M 0 0 V -1.24828 H -18.08"/>
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 								<text class="lab" transform="translate(0 11)">1</text>
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-							<path class="edge" d="M 0 0 V -70.4129 H 36.16"/>
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 							<g class="a5 leaf node n2 p0 sample" transform="translate(-18.08 12.1084)">
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+								<path class="edge e2" d="M 0 0 V -12.1084 H 18.08"/>
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 							<g class="a5 leaf node n3 p0 sample" transform="translate(18.08 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H -18.08"/>
+								<path class="edge e3" d="M 0 0 V -12.1084 H -18.08"/>
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-							<path class="edge" d="M 0 0 V -59.5527 H -36.16"/>
+							<path class="edge e11" d="M 0 0 V -59.5527 H -36.16"/>
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-						<path class="edge" d="M 0 0 V -12.3778 H 0"/>
+						<path class="edge root" d="M 0 0 V -12.3778 H 0"/>
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diff --git a/python/tests/data/svg/ts_rank.svg b/python/tests/data/svg/ts_rank.svg
index b507842dbc..94bf920f2e 100644
--- a/python/tests/data/svg/ts_rank.svg
+++ b/python/tests/data/svg/ts_rank.svg
@@ -152,31 +152,31 @@
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 							<g class="a4 leaf node n0 p0 sample" transform="translate(-18.08 15.9143)">
-								<path class="edge" d="M 0 0 V -15.9143 H 18.08"/>
+								<path class="edge e0" d="M 0 0 V -15.9143 H 18.08"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">0</text>
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 							<g class="a4 leaf node n1 p0 sample" transform="translate(18.08 15.9143)">
-								<path class="edge" d="M 0 0 V -15.9143 H -18.08"/>
+								<path class="edge e1" d="M 0 0 V -15.9143 H -18.08"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
-							<path class="edge" d="M 0 0 V -79.5714 H 36.16"/>
+							<path class="edge e12" d="M 0 0 V -79.5714 H 36.16"/>
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 							<g class="a5 leaf node n2 p0 sample" transform="translate(-18.08 31.8286)">
-								<path class="edge" d="M 0 0 V -31.8286 H 18.08"/>
+								<path class="edge e2" d="M 0 0 V -31.8286 H 18.08"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">2</text>
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 							<g class="a5 leaf node n3 p0 sample" transform="translate(18.08 31.8286)">
-								<path class="edge" d="M 0 0 V -31.8286 H -18.08"/>
+								<path class="edge e3" d="M 0 0 V -31.8286 H -18.08"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">3</text>
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-							<path class="edge" d="M 0 0 V -63.6571 H -36.16"/>
+							<path class="edge e13" d="M 0 0 V -63.6571 H -36.16"/>
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@@ -185,7 +185,7 @@
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-						<path class="edge" d="M 0 0 V -15.9143 H 0"/>
+						<path class="edge root" d="M 0 0 V -15.9143 H 0"/>
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@@ -206,16 +206,16 @@
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 							<g class="a4 leaf node n0 p0 sample" transform="translate(-18.08 15.9143)">
-								<path class="edge" d="M 0 0 V -15.9143 H 18.08"/>
+								<path class="edge e0" d="M 0 0 V -15.9143 H 18.08"/>
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 								<text class="lab" transform="translate(0 11)">0</text>
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 							<g class="a4 leaf node n1 p0 sample" transform="translate(18.08 15.9143)">
-								<path class="edge" d="M 0 0 V -15.9143 H -18.08"/>
+								<path class="edge e1" d="M 0 0 V -15.9143 H -18.08"/>
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 								<text class="lab" transform="translate(0 11)">1</text>
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-							<path class="edge" d="M 0 0 V -47.7429 H 36.16"/>
+							<path class="edge e6" d="M 0 0 V -47.7429 H 36.16"/>
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@@ -231,12 +231,12 @@
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+								<path class="edge e2" d="M 0 0 V -31.8286 H 18.08"/>
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@@ -245,11 +245,11 @@
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@@ -265,35 +265,35 @@
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+							<path class="edge e4" d="M 0 0 V -31.8286 H 36.16"/>
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 						<g class="a6 c2 node n5 p0" transform="translate(36.16 15.9143)">
 							<g class="a5 leaf node n2 p0 sample" transform="translate(-18.08 31.8286)">
-								<path class="edge" d="M 0 0 V -31.8286 H 18.08"/>
+								<path class="edge e2" d="M 0 0 V -31.8286 H 18.08"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">2</text>
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 							<g class="a5 leaf node n3 p0 sample" transform="translate(18.08 31.8286)">
-								<path class="edge" d="M 0 0 V -31.8286 H -18.08"/>
+								<path class="edge e3" d="M 0 0 V -31.8286 H -18.08"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">3</text>
 							</g>
-							<path class="edge" d="M 0 0 V -15.9143 H -36.16"/>
+							<path class="edge e5" d="M 0 0 V -15.9143 H -36.16"/>
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 							<text class="lab rgt" transform="translate(3 -7)">5</text>
 						</g>
-						<path class="edge" d="M 0 0 V -15.9143 H 0"/>
+						<path class="edge root" d="M 0 0 V -15.9143 H 0"/>
 						<circle class="sym" cx="0" cy="0" r="3"/>
 						<text class="lab rgt" transform="translate(3 -7)">6</text>
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@@ -304,27 +304,27 @@
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 						<g class="a7 c2 node n4 p0" transform="translate(-36.16 47.7429)">
 							<g class="a4 leaf node n0 p0 sample" transform="translate(-18.08 15.9143)">
-								<path class="edge" d="M 0 0 V -15.9143 H 18.08"/>
+								<path class="edge e0" d="M 0 0 V -15.9143 H 18.08"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">0</text>
 							</g>
 							<g class="a4 leaf node n1 p0 sample" transform="translate(18.08 15.9143)">
-								<path class="edge" d="M 0 0 V -15.9143 H -18.08"/>
+								<path class="edge e1" d="M 0 0 V -15.9143 H -18.08"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
-							<path class="edge" d="M 0 0 V -47.7429 H 36.16"/>
+							<path class="edge e7" d="M 0 0 V -47.7429 H 36.16"/>
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 							<text class="lab lft" transform="translate(-3 -7)">4</text>
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 						<g class="a7 c2 node n5 p0" transform="translate(36.16 31.8286)">
 							<g class="a5 leaf node n2 p0 sample" transform="translate(-18.08 31.8286)">
-								<path class="edge" d="M 0 0 V -31.8286 H 18.08"/>
+								<path class="edge e2" d="M 0 0 V -31.8286 H 18.08"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">2</text>
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 							<g class="a5 leaf m7 node n3 p0 s4 sample" transform="translate(18.08 31.8286)">
-								<path class="edge" d="M 0 0 V -31.8286 H -18.08"/>
+								<path class="edge e3" d="M 0 0 V -31.8286 H -18.08"/>
 								<g class="mut m7 s4 unknown_time" transform="translate(0 -15.9143)">
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@@ -333,11 +333,11 @@
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">3</text>
 							</g>
-							<path class="edge" d="M 0 0 V -31.8286 H -36.16"/>
+							<path class="edge e9" d="M 0 0 V -31.8286 H -36.16"/>
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 							<text class="lab rgt" transform="translate(3 -7)">5</text>
 						</g>
-						<path class="edge" d="M 0 0 V -15.9143 H 0"/>
+						<path class="edge root" d="M 0 0 V -15.9143 H 0"/>
 						<circle class="sym" cx="0" cy="0" r="3"/>
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@@ -348,35 +348,35 @@
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 						<g class="a8 c2 node n4 p0" transform="translate(-36.16 63.6571)">
 							<g class="a4 leaf node n0 p0 sample" transform="translate(-18.08 15.9143)">
-								<path class="edge" d="M 0 0 V -15.9143 H 18.08"/>
+								<path class="edge e0" d="M 0 0 V -15.9143 H 18.08"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">0</text>
 							</g>
 							<g class="a4 leaf node n1 p0 sample" transform="translate(18.08 15.9143)">
-								<path class="edge" d="M 0 0 V -15.9143 H -18.08"/>
+								<path class="edge e1" d="M 0 0 V -15.9143 H -18.08"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
-							<path class="edge" d="M 0 0 V -63.6571 H 36.16"/>
+							<path class="edge e10" d="M 0 0 V -63.6571 H 36.16"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab lft" transform="translate(-3 -7)">4</text>
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 						<g class="a8 c2 node n5 p0" transform="translate(36.16 47.7429)">
 							<g class="a5 leaf node n2 p0 sample" transform="translate(-18.08 31.8286)">
-								<path class="edge" d="M 0 0 V -31.8286 H 18.08"/>
+								<path class="edge e2" d="M 0 0 V -31.8286 H 18.08"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">2</text>
 							</g>
 							<g class="a5 leaf node n3 p0 sample" transform="translate(18.08 31.8286)">
-								<path class="edge" d="M 0 0 V -31.8286 H -18.08"/>
+								<path class="edge e3" d="M 0 0 V -31.8286 H -18.08"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">3</text>
 							</g>
-							<path class="edge" d="M 0 0 V -47.7429 H -36.16"/>
+							<path class="edge e11" d="M 0 0 V -47.7429 H -36.16"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab rgt" transform="translate(3 -7)">5</text>
 						</g>
-						<path class="edge" d="M 0 0 V -15.9143 H 0"/>
+						<path class="edge root" d="M 0 0 V -15.9143 H 0"/>
 						<circle class="sym" cx="0" cy="0" r="3"/>
 						<text class="lab rgt" transform="translate(3 -7)">8</text>
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diff --git a/python/tests/data/svg/ts_title.svg b/python/tests/data/svg/ts_title.svg
index 49956b21f3..7135939a83 100644
--- a/python/tests/data/svg/ts_title.svg
+++ b/python/tests/data/svg/ts_title.svg
@@ -102,31 +102,31 @@
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 						<g class="a9 c2 node n4 p0" transform="translate(-38 83.0289)">
 							<g class="a4 leaf node n0 p0 sample" transform="translate(-19 1.06003)">
-								<path class="edge" d="M 0 0 V -1.06003 H 19"/>
+								<path class="edge e0" d="M 0 0 V -1.06003 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">0</text>
 							</g>
 							<g class="a4 leaf node n1 p0 sample" transform="translate(19 1.06003)">
-								<path class="edge" d="M 0 0 V -1.06003 H -19"/>
+								<path class="edge e1" d="M 0 0 V -1.06003 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
-							<path class="edge" d="M 0 0 V -83.0289 H 38"/>
+							<path class="edge e12" d="M 0 0 V -83.0289 H 38"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab lft" transform="translate(-3 -7)">4</text>
 						</g>
 						<g class="a9 c2 m2 node n5 p0 s0" transform="translate(38 73.8065)">
 							<g class="a5 leaf node n2 p0 sample" transform="translate(-19 10.2824)">
-								<path class="edge" d="M 0 0 V -10.2824 H 19"/>
+								<path class="edge e2" d="M 0 0 V -10.2824 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">2</text>
 							</g>
 							<g class="a5 leaf node n3 p0 sample" transform="translate(19 10.2824)">
-								<path class="edge" d="M 0 0 V -10.2824 H -19"/>
+								<path class="edge e3" d="M 0 0 V -10.2824 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">3</text>
 							</g>
-							<path class="edge" d="M 0 0 V -73.8065 H -38"/>
+							<path class="edge e13" d="M 0 0 V -73.8065 H -38"/>
 							<g class="mut m2 s0 unknown_time" transform="translate(0 -36.9032)">
 								<line x1="0" x2="0" y1="0" y2="36.9032"/>
 								<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -135,7 +135,7 @@
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab rgt" transform="translate(3 -7)">5</text>
 						</g>
-						<path class="edge" d="M 0 0 V -10.5111 H 0"/>
+						<path class="edge root" d="M 0 0 V -10.5111 H 0"/>
 						<g class="mut m0 s0 unknown_time" transform="translate(0 -7.00741)">
 							<line x1="0" x2="0" y1="0" y2="7.00741"/>
 							<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -156,16 +156,16 @@
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 						<g class="a7 c2 m3 m4 node n4 p0 s1" transform="translate(-38 48.1048)">
 							<g class="a4 leaf node n0 p0 sample" transform="translate(-19 1.06003)">
-								<path class="edge" d="M 0 0 V -1.06003 H 19"/>
+								<path class="edge e0" d="M 0 0 V -1.06003 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">0</text>
 							</g>
 							<g class="a4 leaf node n1 p0 sample" transform="translate(19 1.06003)">
-								<path class="edge" d="M 0 0 V -1.06003 H -19"/>
+								<path class="edge e1" d="M 0 0 V -1.06003 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
-							<path class="edge" d="M 0 0 V -48.1048 H 38"/>
+							<path class="edge e6" d="M 0 0 V -48.1048 H 38"/>
 							<g class="mut m3 s1 unknown_time" transform="translate(0 -32.0699)">
 								<line x1="0" x2="0" y1="0" y2="32.0699"/>
 								<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -181,12 +181,12 @@
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 						<g class="a7 c2 node n5 p0" transform="translate(38 38.8825)">
 							<g class="a5 leaf node n2 p0 sample" transform="translate(-19 10.2824)">
-								<path class="edge" d="M 0 0 V -10.2824 H 19"/>
+								<path class="edge e2" d="M 0 0 V -10.2824 H 19"/>
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 								<text class="lab" transform="translate(0 11)">2</text>
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 							<g class="a5 leaf m6 node n3 p0 s2 sample" transform="translate(19 10.2824)">
-								<path class="edge" d="M 0 0 V -10.2824 H -19"/>
+								<path class="edge e3" d="M 0 0 V -10.2824 H -19"/>
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@@ -195,11 +195,11 @@
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 								<text class="lab" transform="translate(0 11)">3</text>
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-							<path class="edge" d="M 0 0 V -38.8825 H -38"/>
+							<path class="edge e8" d="M 0 0 V -38.8825 H -38"/>
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 							<text class="lab rgt" transform="translate(3 -7)">5</text>
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-						<path class="edge" d="M 0 0 V -10.5111 H 0"/>
+						<path class="edge root" d="M 0 0 V -10.5111 H 0"/>
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@@ -215,35 +215,35 @@
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 							<g class="a4 leaf node n0 p0 sample" transform="translate(-19 1.06003)">
-								<path class="edge" d="M 0 0 V -1.06003 H 19"/>
+								<path class="edge e0" d="M 0 0 V -1.06003 H 19"/>
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 							<g class="a4 leaf node n1 p0 sample" transform="translate(19 1.06003)">
-								<path class="edge" d="M 0 0 V -1.06003 H -19"/>
+								<path class="edge e1" d="M 0 0 V -1.06003 H -19"/>
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 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
-							<path class="edge" d="M 0 0 V -15.1415 H 38"/>
+							<path class="edge e4" d="M 0 0 V -15.1415 H 38"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab lft" transform="translate(-3 -7)">4</text>
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 						<g class="a6 c2 node n5 p0" transform="translate(38 5.91915)">
 							<g class="a5 leaf node n2 p0 sample" transform="translate(-19 10.2824)">
-								<path class="edge" d="M 0 0 V -10.2824 H 19"/>
+								<path class="edge e2" d="M 0 0 V -10.2824 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">2</text>
 							</g>
 							<g class="a5 leaf node n3 p0 sample" transform="translate(19 10.2824)">
-								<path class="edge" d="M 0 0 V -10.2824 H -19"/>
+								<path class="edge e3" d="M 0 0 V -10.2824 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">3</text>
 							</g>
-							<path class="edge" d="M 0 0 V -5.91915 H -38"/>
+							<path class="edge e5" d="M 0 0 V -5.91915 H -38"/>
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 							<text class="lab rgt" transform="translate(3 -7)">5</text>
 						</g>
-						<path class="edge" d="M 0 0 V -10.5111 H 0"/>
+						<path class="edge root" d="M 0 0 V -10.5111 H 0"/>
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@@ -254,27 +254,27 @@
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 							<g class="a4 leaf node n0 p0 sample" transform="translate(-19 1.06003)">
-								<path class="edge" d="M 0 0 V -1.06003 H 19"/>
+								<path class="edge e0" d="M 0 0 V -1.06003 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">0</text>
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 							<g class="a4 leaf node n1 p0 sample" transform="translate(19 1.06003)">
-								<path class="edge" d="M 0 0 V -1.06003 H -19"/>
+								<path class="edge e1" d="M 0 0 V -1.06003 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
-							<path class="edge" d="M 0 0 V -48.1048 H 38"/>
+							<path class="edge e7" d="M 0 0 V -48.1048 H 38"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab lft" transform="translate(-3 -7)">4</text>
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 						<g class="a7 c2 node n5 p0" transform="translate(38 38.8825)">
 							<g class="a5 leaf node n2 p0 sample" transform="translate(-19 10.2824)">
-								<path class="edge" d="M 0 0 V -10.2824 H 19"/>
+								<path class="edge e2" d="M 0 0 V -10.2824 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">2</text>
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 							<g class="a5 leaf m7 node n3 p0 s4 sample" transform="translate(19 10.2824)">
-								<path class="edge" d="M 0 0 V -10.2824 H -19"/>
+								<path class="edge e3" d="M 0 0 V -10.2824 H -19"/>
 								<g class="mut m7 s4 unknown_time" transform="translate(0 -5.1412)">
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@@ -283,11 +283,11 @@
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 								<text class="lab" transform="translate(0 11)">3</text>
 							</g>
-							<path class="edge" d="M 0 0 V -38.8825 H -38"/>
+							<path class="edge e9" d="M 0 0 V -38.8825 H -38"/>
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-						<path class="edge" d="M 0 0 V -10.5111 H 0"/>
+						<path class="edge root" d="M 0 0 V -10.5111 H 0"/>
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@@ -298,35 +298,35 @@
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 							<g class="a4 leaf node n0 p0 sample" transform="translate(-19 1.06003)">
-								<path class="edge" d="M 0 0 V -1.06003 H 19"/>
+								<path class="edge e0" d="M 0 0 V -1.06003 H 19"/>
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 							<g class="a4 leaf node n1 p0 sample" transform="translate(19 1.06003)">
-								<path class="edge" d="M 0 0 V -1.06003 H -19"/>
+								<path class="edge e1" d="M 0 0 V -1.06003 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
-							<path class="edge" d="M 0 0 V -59.7941 H 38"/>
+							<path class="edge e10" d="M 0 0 V -59.7941 H 38"/>
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 							<g class="a5 leaf node n2 p0 sample" transform="translate(-19 10.2824)">
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+								<path class="edge e2" d="M 0 0 V -10.2824 H 19"/>
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+								<path class="edge e3" d="M 0 0 V -10.2824 H -19"/>
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-							<path class="edge" d="M 0 0 V -50.5717 H -38"/>
+							<path class="edge e11" d="M 0 0 V -50.5717 H -38"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab rgt" transform="translate(3 -7)">5</text>
 						</g>
-						<path class="edge" d="M 0 0 V -10.5111 H 0"/>
+						<path class="edge root" d="M 0 0 V -10.5111 H 0"/>
 						<circle class="sym" cx="0" cy="0" r="3"/>
 						<text class="lab rgt" transform="translate(3 -7)">8</text>
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diff --git a/python/tests/data/svg/ts_x_lim.svg b/python/tests/data/svg/ts_x_lim.svg
index 5a8256ec64..54c428eb91 100644
--- a/python/tests/data/svg/ts_x_lim.svg
+++ b/python/tests/data/svg/ts_x_lim.svg
@@ -58,35 +58,35 @@
 					<g class="c2 node n9 p0 root" transform="translate(93.3333 22.3778)">
 						<g class="a9 c2 node n4 p0" transform="translate(-36.6667 97.7739)">
 							<g class="a4 leaf node n0 p0 sample" transform="translate(-18.3333 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H 18.3333"/>
+								<path class="edge e0" d="M 0 0 V -1.24828 H 18.3333"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">0</text>
 							</g>
 							<g class="a4 leaf node n1 p0 sample" transform="translate(18.3333 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H -18.3333"/>
+								<path class="edge e1" d="M 0 0 V -1.24828 H -18.3333"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
-							<path class="edge" d="M 0 0 V -97.7739 H 36.6667"/>
+							<path class="edge e8" d="M 0 0 V -97.7739 H 36.6667"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab lft" transform="translate(-3 -7)">4</text>
 						</g>
 						<g class="a9 c2 node n5 p0" transform="translate(36.6667 86.9138)">
 							<g class="a5 leaf node n2 p0 sample" transform="translate(-18.3333 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H 18.3333"/>
+								<path class="edge e2" d="M 0 0 V -12.1084 H 18.3333"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">2</text>
 							</g>
 							<g class="a5 leaf node n3 p0 sample" transform="translate(18.3333 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H -18.3333"/>
+								<path class="edge e3" d="M 0 0 V -12.1084 H -18.3333"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">3</text>
 							</g>
-							<path class="edge" d="M 0 0 V -86.9138 H -36.6667"/>
+							<path class="edge e9" d="M 0 0 V -86.9138 H -36.6667"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab rgt" transform="translate(3 -7)">5</text>
 						</g>
-						<path class="edge" d="M 0 0 V -12.3778 H 0"/>
+						<path class="edge root" d="M 0 0 V -12.3778 H 0"/>
 						<circle class="sym" cx="0" cy="0" r="3"/>
 						<text class="lab rgt" transform="translate(3 -7)">9</text>
 					</g>
@@ -97,16 +97,16 @@
 					<g class="c2 m5 node n7 p0 root s2" transform="translate(93.3333 63.504)">
 						<g class="a7 c2 m3 m4 node n4 p0 s1" transform="translate(-36.6667 56.6478)">
 							<g class="a4 leaf node n0 p0 sample" transform="translate(-18.3333 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H 18.3333"/>
+								<path class="edge e0" d="M 0 0 V -1.24828 H 18.3333"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">0</text>
 							</g>
 							<g class="a4 leaf node n1 p0 sample" transform="translate(18.3333 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H -18.3333"/>
+								<path class="edge e1" d="M 0 0 V -1.24828 H -18.3333"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
-							<path class="edge" d="M 0 0 V -56.6478 H 36.6667"/>
+							<path class="edge e6" d="M 0 0 V -56.6478 H 36.6667"/>
 							<g class="mut m3 s1 unknown_time" transform="translate(0 -37.7652)">
 								<line x1="0" x2="0" y1="0" y2="37.7652"/>
 								<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -122,12 +122,12 @@
 						</g>
 						<g class="a7 c2 node n5 p0" transform="translate(36.6667 45.7876)">
 							<g class="a5 leaf node n2 p0 sample" transform="translate(-18.3333 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H 18.3333"/>
+								<path class="edge e2" d="M 0 0 V -12.1084 H 18.3333"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">2</text>
 							</g>
 							<g class="a5 leaf m6 node n3 p0 s2 sample" transform="translate(18.3333 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H -18.3333"/>
+								<path class="edge e3" d="M 0 0 V -12.1084 H -18.3333"/>
 								<g class="mut m6 s2 unknown_time" transform="translate(0 -6.05422)">
 									<line x1="0" x2="0" y1="0" y2="6.05422"/>
 									<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -136,11 +136,11 @@
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">3</text>
 							</g>
-							<path class="edge" d="M 0 0 V -45.7876 H -36.6667"/>
+							<path class="edge e7" d="M 0 0 V -45.7876 H -36.6667"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab rgt" transform="translate(3 -7)">5</text>
 						</g>
-						<path class="edge" d="M 0 0 V -12.3778 H 0"/>
+						<path class="edge root" d="M 0 0 V -12.3778 H 0"/>
 						<g class="mut m5 s2 unknown_time" transform="translate(0 -6.18889)">
 							<line x1="0" x2="0" y1="0" y2="6.18889"/>
 							<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -156,35 +156,35 @@
 					<g class="c2 node n6 p0 root" transform="translate(93.3333 102.321)">
 						<g class="a6 c2 node n4 p0" transform="translate(-36.6667 17.8305)">
 							<g class="a4 leaf node n0 p0 sample" transform="translate(-18.3333 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H 18.3333"/>
+								<path class="edge e0" d="M 0 0 V -1.24828 H 18.3333"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">0</text>
 							</g>
 							<g class="a4 leaf node n1 p0 sample" transform="translate(18.3333 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H -18.3333"/>
+								<path class="edge e1" d="M 0 0 V -1.24828 H -18.3333"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
-							<path class="edge" d="M 0 0 V -17.8305 H 36.6667"/>
+							<path class="edge e4" d="M 0 0 V -17.8305 H 36.6667"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab lft" transform="translate(-3 -7)">4</text>
 						</g>
 						<g class="a6 c2 node n5 p0" transform="translate(36.6667 6.97033)">
 							<g class="a5 leaf node n2 p0 sample" transform="translate(-18.3333 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H 18.3333"/>
+								<path class="edge e2" d="M 0 0 V -12.1084 H 18.3333"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">2</text>
 							</g>
 							<g class="a5 leaf node n3 p0 sample" transform="translate(18.3333 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H -18.3333"/>
+								<path class="edge e3" d="M 0 0 V -12.1084 H -18.3333"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">3</text>
 							</g>
-							<path class="edge" d="M 0 0 V -6.97033 H -36.6667"/>
+							<path class="edge e5" d="M 0 0 V -6.97033 H -36.6667"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab rgt" transform="translate(3 -7)">5</text>
 						</g>
-						<path class="edge" d="M 0 0 V -12.3778 H 0"/>
+						<path class="edge root" d="M 0 0 V -12.3778 H 0"/>
 						<circle class="sym" cx="0" cy="0" r="3"/>
 						<text class="lab rgt" transform="translate(3 -7)">6</text>
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diff --git a/python/tests/data/svg/ts_xlabel.svg b/python/tests/data/svg/ts_xlabel.svg
index f786ee3682..db033b5bea 100644
--- a/python/tests/data/svg/ts_xlabel.svg
+++ b/python/tests/data/svg/ts_xlabel.svg
@@ -102,31 +102,31 @@
 					<g class="c2 m0 m1 node n9 p0 root s0" transform="translate(96 22.3778)">
 						<g class="a9 c2 node n4 p0" transform="translate(-38 97.7739)">
 							<g class="a4 leaf node n0 p0 sample" transform="translate(-19 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H 19"/>
+								<path class="edge e0" d="M 0 0 V -1.24828 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">0</text>
 							</g>
 							<g class="a4 leaf node n1 p0 sample" transform="translate(19 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H -19"/>
+								<path class="edge e1" d="M 0 0 V -1.24828 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
-							<path class="edge" d="M 0 0 V -97.7739 H 38"/>
+							<path class="edge e12" d="M 0 0 V -97.7739 H 38"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab lft" transform="translate(-3 -7)">4</text>
 						</g>
 						<g class="a9 c2 m2 node n5 p0 s0" transform="translate(38 86.9138)">
 							<g class="a5 leaf node n2 p0 sample" transform="translate(-19 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H 19"/>
+								<path class="edge e2" d="M 0 0 V -12.1084 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">2</text>
 							</g>
 							<g class="a5 leaf node n3 p0 sample" transform="translate(19 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H -19"/>
+								<path class="edge e3" d="M 0 0 V -12.1084 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">3</text>
 							</g>
-							<path class="edge" d="M 0 0 V -86.9138 H -38"/>
+							<path class="edge e13" d="M 0 0 V -86.9138 H -38"/>
 							<g class="mut m2 s0 unknown_time" transform="translate(0 -43.4569)">
 								<line x1="0" x2="0" y1="0" y2="43.4569"/>
 								<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -135,7 +135,7 @@
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab rgt" transform="translate(3 -7)">5</text>
 						</g>
-						<path class="edge" d="M 0 0 V -12.3778 H 0"/>
+						<path class="edge root" d="M 0 0 V -12.3778 H 0"/>
 						<g class="mut m0 s0 unknown_time" transform="translate(0 -8.25185)">
 							<line x1="0" x2="0" y1="0" y2="8.25185"/>
 							<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -156,16 +156,16 @@
 					<g class="c2 m5 node n7 p0 root s2" transform="translate(96 63.504)">
 						<g class="a7 c2 m3 m4 node n4 p0 s1" transform="translate(-38 56.6478)">
 							<g class="a4 leaf node n0 p0 sample" transform="translate(-19 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H 19"/>
+								<path class="edge e0" d="M 0 0 V -1.24828 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">0</text>
 							</g>
 							<g class="a4 leaf node n1 p0 sample" transform="translate(19 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H -19"/>
+								<path class="edge e1" d="M 0 0 V -1.24828 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
-							<path class="edge" d="M 0 0 V -56.6478 H 38"/>
+							<path class="edge e6" d="M 0 0 V -56.6478 H 38"/>
 							<g class="mut m3 s1 unknown_time" transform="translate(0 -37.7652)">
 								<line x1="0" x2="0" y1="0" y2="37.7652"/>
 								<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -181,12 +181,12 @@
 						</g>
 						<g class="a7 c2 node n5 p0" transform="translate(38 45.7876)">
 							<g class="a5 leaf node n2 p0 sample" transform="translate(-19 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H 19"/>
+								<path class="edge e2" d="M 0 0 V -12.1084 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">2</text>
 							</g>
 							<g class="a5 leaf m6 node n3 p0 s2 sample" transform="translate(19 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H -19"/>
+								<path class="edge e3" d="M 0 0 V -12.1084 H -19"/>
 								<g class="mut m6 s2 unknown_time" transform="translate(0 -6.05422)">
 									<line x1="0" x2="0" y1="0" y2="6.05422"/>
 									<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -195,11 +195,11 @@
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">3</text>
 							</g>
-							<path class="edge" d="M 0 0 V -45.7876 H -38"/>
+							<path class="edge e8" d="M 0 0 V -45.7876 H -38"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab rgt" transform="translate(3 -7)">5</text>
 						</g>
-						<path class="edge" d="M 0 0 V -12.3778 H 0"/>
+						<path class="edge root" d="M 0 0 V -12.3778 H 0"/>
 						<g class="mut m5 s2 unknown_time" transform="translate(0 -6.18889)">
 							<line x1="0" x2="0" y1="0" y2="6.18889"/>
 							<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -215,35 +215,35 @@
 					<g class="c2 node n6 p0 root" transform="translate(96 102.321)">
 						<g class="a6 c2 node n4 p0" transform="translate(-38 17.8305)">
 							<g class="a4 leaf node n0 p0 sample" transform="translate(-19 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H 19"/>
+								<path class="edge e0" d="M 0 0 V -1.24828 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">0</text>
 							</g>
 							<g class="a4 leaf node n1 p0 sample" transform="translate(19 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H -19"/>
+								<path class="edge e1" d="M 0 0 V -1.24828 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
-							<path class="edge" d="M 0 0 V -17.8305 H 38"/>
+							<path class="edge e4" d="M 0 0 V -17.8305 H 38"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab lft" transform="translate(-3 -7)">4</text>
 						</g>
 						<g class="a6 c2 node n5 p0" transform="translate(38 6.97033)">
 							<g class="a5 leaf node n2 p0 sample" transform="translate(-19 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H 19"/>
+								<path class="edge e2" d="M 0 0 V -12.1084 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">2</text>
 							</g>
 							<g class="a5 leaf node n3 p0 sample" transform="translate(19 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H -19"/>
+								<path class="edge e3" d="M 0 0 V -12.1084 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">3</text>
 							</g>
-							<path class="edge" d="M 0 0 V -6.97033 H -38"/>
+							<path class="edge e5" d="M 0 0 V -6.97033 H -38"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab rgt" transform="translate(3 -7)">5</text>
 						</g>
-						<path class="edge" d="M 0 0 V -12.3778 H 0"/>
+						<path class="edge root" d="M 0 0 V -12.3778 H 0"/>
 						<circle class="sym" cx="0" cy="0" r="3"/>
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@@ -254,27 +254,27 @@
 					<g class="c2 node n7 p0 root" transform="translate(96 63.504)">
 						<g class="a7 c2 node n4 p0" transform="translate(-38 56.6478)">
 							<g class="a4 leaf node n0 p0 sample" transform="translate(-19 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H 19"/>
+								<path class="edge e0" d="M 0 0 V -1.24828 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">0</text>
 							</g>
 							<g class="a4 leaf node n1 p0 sample" transform="translate(19 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H -19"/>
+								<path class="edge e1" d="M 0 0 V -1.24828 H -19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
-							<path class="edge" d="M 0 0 V -56.6478 H 38"/>
+							<path class="edge e7" d="M 0 0 V -56.6478 H 38"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab lft" transform="translate(-3 -7)">4</text>
 						</g>
 						<g class="a7 c2 node n5 p0" transform="translate(38 45.7876)">
 							<g class="a5 leaf node n2 p0 sample" transform="translate(-19 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H 19"/>
+								<path class="edge e2" d="M 0 0 V -12.1084 H 19"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">2</text>
 							</g>
 							<g class="a5 leaf m7 node n3 p0 s4 sample" transform="translate(19 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H -19"/>
+								<path class="edge e3" d="M 0 0 V -12.1084 H -19"/>
 								<g class="mut m7 s4 unknown_time" transform="translate(0 -6.05422)">
 									<line x1="0" x2="0" y1="0" y2="6.05422"/>
 									<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -283,11 +283,11 @@
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">3</text>
 							</g>
-							<path class="edge" d="M 0 0 V -45.7876 H -38"/>
+							<path class="edge e9" d="M 0 0 V -45.7876 H -38"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab rgt" transform="translate(3 -7)">5</text>
 						</g>
-						<path class="edge" d="M 0 0 V -12.3778 H 0"/>
+						<path class="edge root" d="M 0 0 V -12.3778 H 0"/>
 						<circle class="sym" cx="0" cy="0" r="3"/>
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@@ -298,35 +298,35 @@
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-								<path class="edge" d="M 0 0 V -1.24828 H 19"/>
+								<path class="edge e0" d="M 0 0 V -1.24828 H 19"/>
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 							<g class="a4 leaf node n1 p0 sample" transform="translate(19 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H -19"/>
+								<path class="edge e1" d="M 0 0 V -1.24828 H -19"/>
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 								<text class="lab" transform="translate(0 11)">1</text>
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-							<path class="edge" d="M 0 0 V -70.4129 H 38"/>
+							<path class="edge e10" d="M 0 0 V -70.4129 H 38"/>
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+								<path class="edge e2" d="M 0 0 V -12.1084 H 19"/>
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+								<path class="edge e3" d="M 0 0 V -12.1084 H -19"/>
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-							<path class="edge" d="M 0 0 V -59.5527 H -38"/>
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+						<path class="edge root" d="M 0 0 V -12.3778 H 0"/>
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diff --git a/python/tests/data/svg/ts_y_axis.svg b/python/tests/data/svg/ts_y_axis.svg
index d590fef37a..3750b54150 100644
--- a/python/tests/data/svg/ts_y_axis.svg
+++ b/python/tests/data/svg/ts_y_axis.svg
@@ -152,31 +152,31 @@
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-								<path class="edge" d="M 0 0 V -1.24828 H 18.08"/>
+								<path class="edge e0" d="M 0 0 V -1.24828 H 18.08"/>
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 								<text class="lab" transform="translate(0 11)">0</text>
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 							<g class="a4 leaf node n1 p0 sample" transform="translate(18.08 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H -18.08"/>
+								<path class="edge e1" d="M 0 0 V -1.24828 H -18.08"/>
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 								<text class="lab" transform="translate(0 11)">1</text>
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-							<path class="edge" d="M 0 0 V -97.7739 H 36.16"/>
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 							<g class="a5 leaf node n2 p0 sample" transform="translate(-18.08 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H 18.08"/>
+								<path class="edge e2" d="M 0 0 V -12.1084 H 18.08"/>
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 							<g class="a5 leaf node n3 p0 sample" transform="translate(18.08 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H -18.08"/>
+								<path class="edge e3" d="M 0 0 V -12.1084 H -18.08"/>
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 								<text class="lab" transform="translate(0 11)">3</text>
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-							<path class="edge" d="M 0 0 V -86.9138 H -36.16"/>
+							<path class="edge e13" d="M 0 0 V -86.9138 H -36.16"/>
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@@ -185,7 +185,7 @@
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-						<path class="edge" d="M 0 0 V -12.3778 H 0"/>
+						<path class="edge root" d="M 0 0 V -12.3778 H 0"/>
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@@ -206,16 +206,16 @@
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 							<g class="a4 leaf node n0 p0 sample" transform="translate(-18.08 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H 18.08"/>
+								<path class="edge e0" d="M 0 0 V -1.24828 H 18.08"/>
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 								<text class="lab" transform="translate(0 11)">0</text>
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 							<g class="a4 leaf node n1 p0 sample" transform="translate(18.08 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H -18.08"/>
+								<path class="edge e1" d="M 0 0 V -1.24828 H -18.08"/>
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 								<text class="lab" transform="translate(0 11)">1</text>
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-							<path class="edge" d="M 0 0 V -56.6478 H 36.16"/>
+							<path class="edge e6" d="M 0 0 V -56.6478 H 36.16"/>
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@@ -231,12 +231,12 @@
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 							<g class="a5 leaf node n2 p0 sample" transform="translate(-18.08 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H 18.08"/>
+								<path class="edge e2" d="M 0 0 V -12.1084 H 18.08"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">2</text>
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-								<path class="edge" d="M 0 0 V -12.1084 H -18.08"/>
+								<path class="edge e3" d="M 0 0 V -12.1084 H -18.08"/>
 								<g class="mut m6 s2 unknown_time" transform="translate(0 -6.05422)">
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@@ -245,11 +245,11 @@
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 								<text class="lab" transform="translate(0 11)">3</text>
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-							<path class="edge" d="M 0 0 V -45.7876 H -36.16"/>
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+						<path class="edge root" d="M 0 0 V -12.3778 H 0"/>
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@@ -265,35 +265,35 @@
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-								<path class="edge" d="M 0 0 V -1.24828 H 18.08"/>
+								<path class="edge e0" d="M 0 0 V -1.24828 H 18.08"/>
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 								<text class="lab" transform="translate(0 11)">0</text>
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 							<g class="a4 leaf node n1 p0 sample" transform="translate(18.08 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H -18.08"/>
+								<path class="edge e1" d="M 0 0 V -1.24828 H -18.08"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
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-							<path class="edge" d="M 0 0 V -17.8305 H 36.16"/>
+							<path class="edge e4" d="M 0 0 V -17.8305 H 36.16"/>
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 						<g class="a6 c2 node n5 p0" transform="translate(36.16 6.97033)">
 							<g class="a5 leaf node n2 p0 sample" transform="translate(-18.08 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H 18.08"/>
+								<path class="edge e2" d="M 0 0 V -12.1084 H 18.08"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">2</text>
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 							<g class="a5 leaf node n3 p0 sample" transform="translate(18.08 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H -18.08"/>
+								<path class="edge e3" d="M 0 0 V -12.1084 H -18.08"/>
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 							</g>
-							<path class="edge" d="M 0 0 V -6.97033 H -36.16"/>
+							<path class="edge e5" d="M 0 0 V -6.97033 H -36.16"/>
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-						<path class="edge" d="M 0 0 V -12.3778 H 0"/>
+						<path class="edge root" d="M 0 0 V -12.3778 H 0"/>
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@@ -304,27 +304,27 @@
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 							<g class="a4 leaf node n0 p0 sample" transform="translate(-18.08 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H 18.08"/>
+								<path class="edge e0" d="M 0 0 V -1.24828 H 18.08"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">0</text>
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 							<g class="a4 leaf node n1 p0 sample" transform="translate(18.08 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H -18.08"/>
+								<path class="edge e1" d="M 0 0 V -1.24828 H -18.08"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
-							<path class="edge" d="M 0 0 V -56.6478 H 36.16"/>
+							<path class="edge e7" d="M 0 0 V -56.6478 H 36.16"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab lft" transform="translate(-3 -7)">4</text>
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 						<g class="a7 c2 node n5 p0" transform="translate(36.16 45.7876)">
 							<g class="a5 leaf node n2 p0 sample" transform="translate(-18.08 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H 18.08"/>
+								<path class="edge e2" d="M 0 0 V -12.1084 H 18.08"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">2</text>
 							</g>
 							<g class="a5 leaf m7 node n3 p0 s4 sample" transform="translate(18.08 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H -18.08"/>
+								<path class="edge e3" d="M 0 0 V -12.1084 H -18.08"/>
 								<g class="mut m7 s4 unknown_time" transform="translate(0 -6.05422)">
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 									<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -333,11 +333,11 @@
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">3</text>
 							</g>
-							<path class="edge" d="M 0 0 V -45.7876 H -36.16"/>
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 						</g>
-						<path class="edge" d="M 0 0 V -12.3778 H 0"/>
+						<path class="edge root" d="M 0 0 V -12.3778 H 0"/>
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@@ -348,35 +348,35 @@
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 						<g class="a8 c2 node n4 p0" transform="translate(-36.16 70.4129)">
 							<g class="a4 leaf node n0 p0 sample" transform="translate(-18.08 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H 18.08"/>
+								<path class="edge e0" d="M 0 0 V -1.24828 H 18.08"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">0</text>
 							</g>
 							<g class="a4 leaf node n1 p0 sample" transform="translate(18.08 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H -18.08"/>
+								<path class="edge e1" d="M 0 0 V -1.24828 H -18.08"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
-							<path class="edge" d="M 0 0 V -70.4129 H 36.16"/>
+							<path class="edge e10" d="M 0 0 V -70.4129 H 36.16"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab lft" transform="translate(-3 -7)">4</text>
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 						<g class="a8 c2 node n5 p0" transform="translate(36.16 59.5527)">
 							<g class="a5 leaf node n2 p0 sample" transform="translate(-18.08 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H 18.08"/>
+								<path class="edge e2" d="M 0 0 V -12.1084 H 18.08"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">2</text>
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 							<g class="a5 leaf node n3 p0 sample" transform="translate(18.08 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H -18.08"/>
+								<path class="edge e3" d="M 0 0 V -12.1084 H -18.08"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">3</text>
 							</g>
-							<path class="edge" d="M 0 0 V -59.5527 H -36.16"/>
+							<path class="edge e11" d="M 0 0 V -59.5527 H -36.16"/>
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 							<text class="lab rgt" transform="translate(3 -7)">5</text>
 						</g>
-						<path class="edge" d="M 0 0 V -12.3778 H 0"/>
+						<path class="edge root" d="M 0 0 V -12.3778 H 0"/>
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diff --git a/python/tests/data/svg/ts_y_axis_log.svg b/python/tests/data/svg/ts_y_axis_log.svg
index e1e5814fcf..54a1c47864 100644
--- a/python/tests/data/svg/ts_y_axis_log.svg
+++ b/python/tests/data/svg/ts_y_axis_log.svg
@@ -152,31 +152,31 @@
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 							<g class="a4 leaf node n0 p0 sample" transform="translate(-18.08 4.64534)">
-								<path class="edge" d="M 0 0 V -4.64534 H 18.08"/>
+								<path class="edge e0" d="M 0 0 V -4.64534 H 18.08"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">0</text>
 							</g>
 							<g class="a4 leaf node n1 p0 sample" transform="translate(18.08 4.64534)">
-								<path class="edge" d="M 0 0 V -4.64534 H -18.08"/>
+								<path class="edge e1" d="M 0 0 V -4.64534 H -18.08"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
-							<path class="edge" d="M 0 0 V -94.3769 H 36.16"/>
+							<path class="edge e12" d="M 0 0 V -94.3769 H 36.16"/>
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 						<g class="a9 c2 m2 node n5 p0 s0" transform="translate(36.16 67.0122)">
 							<g class="a5 leaf node n2 p0 sample" transform="translate(-18.08 32.01)">
-								<path class="edge" d="M 0 0 V -32.01 H 18.08"/>
+								<path class="edge e2" d="M 0 0 V -32.01 H 18.08"/>
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 								<text class="lab" transform="translate(0 11)">2</text>
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 							<g class="a5 leaf node n3 p0 sample" transform="translate(18.08 32.01)">
-								<path class="edge" d="M 0 0 V -32.01 H -18.08"/>
+								<path class="edge e3" d="M 0 0 V -32.01 H -18.08"/>
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-							<path class="edge" d="M 0 0 V -67.0122 H -36.16"/>
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@@ -185,7 +185,7 @@
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-						<path class="edge" d="M 0 0 V -9.59208 H 0"/>
+						<path class="edge root" d="M 0 0 V -9.59208 H 0"/>
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@@ -206,16 +206,16 @@
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+								<path class="edge e0" d="M 0 0 V -4.64534 H 18.08"/>
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-								<path class="edge" d="M 0 0 V -4.64534 H -18.08"/>
+								<path class="edge e1" d="M 0 0 V -4.64534 H -18.08"/>
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-							<path class="edge" d="M 0 0 V -74.2963 H 36.16"/>
+							<path class="edge e6" d="M 0 0 V -74.2963 H 36.16"/>
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@@ -231,12 +231,12 @@
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+								<path class="edge e2" d="M 0 0 V -32.01 H 18.08"/>
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-								<path class="edge" d="M 0 0 V -32.01 H -18.08"/>
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@@ -245,11 +245,11 @@
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-							<path class="edge" d="M 0 0 V -46.9316 H -36.16"/>
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@@ -265,35 +265,35 @@
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-								<path class="edge" d="M 0 0 V -4.64534 H 18.08"/>
+								<path class="edge e0" d="M 0 0 V -4.64534 H 18.08"/>
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+								<path class="edge e1" d="M 0 0 V -4.64534 H -18.08"/>
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+								<path class="edge e2" d="M 0 0 V -32.01 H 18.08"/>
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-							<path class="edge" d="M 0 0 V -11.3388 H -36.16"/>
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@@ -304,27 +304,27 @@
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-								<path class="edge" d="M 0 0 V -4.64534 H 18.08"/>
+								<path class="edge e0" d="M 0 0 V -4.64534 H 18.08"/>
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-							<path class="edge" d="M 0 0 V -74.2963 H 36.16"/>
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+								<path class="edge e2" d="M 0 0 V -32.01 H 18.08"/>
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-								<path class="edge" d="M 0 0 V -32.01 H -18.08"/>
+								<path class="edge e3" d="M 0 0 V -32.01 H -18.08"/>
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@@ -333,11 +333,11 @@
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 								<text class="lab" transform="translate(0 11)">3</text>
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@@ -348,35 +348,35 @@
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+								<path class="edge e0" d="M 0 0 V -4.64534 H 18.08"/>
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 							<g class="a4 leaf node n1 p0 sample" transform="translate(18.08 4.64534)">
-								<path class="edge" d="M 0 0 V -4.64534 H -18.08"/>
+								<path class="edge e1" d="M 0 0 V -4.64534 H -18.08"/>
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+								<path class="edge e2" d="M 0 0 V -32.01 H 18.08"/>
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+								<path class="edge e3" d="M 0 0 V -32.01 H -18.08"/>
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-							<path class="edge" d="M 0 0 V -54.7471 H -36.16"/>
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-						<path class="edge" d="M 0 0 V -9.59208 H 0"/>
+						<path class="edge root" d="M 0 0 V -9.59208 H 0"/>
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diff --git a/python/tests/data/svg/ts_y_axis_regular.svg b/python/tests/data/svg/ts_y_axis_regular.svg
index 1ee704a096..40931a2b2c 100644
--- a/python/tests/data/svg/ts_y_axis_regular.svg
+++ b/python/tests/data/svg/ts_y_axis_regular.svg
@@ -180,31 +180,31 @@
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 							<g class="a4 leaf node n0 p0 sample" transform="translate(-18.08 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H 18.08"/>
+								<path class="edge e0" d="M 0 0 V -1.24828 H 18.08"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">0</text>
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 							<g class="a4 leaf node n1 p0 sample" transform="translate(18.08 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H -18.08"/>
+								<path class="edge e1" d="M 0 0 V -1.24828 H -18.08"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
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-							<path class="edge" d="M 0 0 V -97.7739 H 36.16"/>
+							<path class="edge e12" d="M 0 0 V -97.7739 H 36.16"/>
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 							<g class="a5 leaf node n2 p0 sample" transform="translate(-18.08 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H 18.08"/>
+								<path class="edge e2" d="M 0 0 V -12.1084 H 18.08"/>
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 							<g class="a5 leaf node n3 p0 sample" transform="translate(18.08 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H -18.08"/>
+								<path class="edge e3" d="M 0 0 V -12.1084 H -18.08"/>
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 								<text class="lab" transform="translate(0 11)">3</text>
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-							<path class="edge" d="M 0 0 V -86.9138 H -36.16"/>
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@@ -213,7 +213,7 @@
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-						<path class="edge" d="M 0 0 V -12.3778 H 0"/>
+						<path class="edge root" d="M 0 0 V -12.3778 H 0"/>
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@@ -234,16 +234,16 @@
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 							<g class="a4 leaf node n0 p0 sample" transform="translate(-18.08 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H 18.08"/>
+								<path class="edge e0" d="M 0 0 V -1.24828 H 18.08"/>
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 								<text class="lab" transform="translate(0 11)">0</text>
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 							<g class="a4 leaf node n1 p0 sample" transform="translate(18.08 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H -18.08"/>
+								<path class="edge e1" d="M 0 0 V -1.24828 H -18.08"/>
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 								<text class="lab" transform="translate(0 11)">1</text>
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-							<path class="edge" d="M 0 0 V -56.6478 H 36.16"/>
+							<path class="edge e6" d="M 0 0 V -56.6478 H 36.16"/>
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@@ -259,12 +259,12 @@
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+								<path class="edge e2" d="M 0 0 V -12.1084 H 18.08"/>
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@@ -273,11 +273,11 @@
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@@ -293,35 +293,35 @@
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+								<path class="edge e0" d="M 0 0 V -1.24828 H 18.08"/>
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+								<path class="edge e1" d="M 0 0 V -1.24828 H -18.08"/>
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+								<path class="edge e2" d="M 0 0 V -12.1084 H 18.08"/>
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@@ -332,27 +332,27 @@
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 							<g class="a4 leaf node n1 p0 sample" transform="translate(18.08 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H -18.08"/>
+								<path class="edge e1" d="M 0 0 V -1.24828 H -18.08"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
-							<path class="edge" d="M 0 0 V -56.6478 H 36.16"/>
+							<path class="edge e7" d="M 0 0 V -56.6478 H 36.16"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab lft" transform="translate(-3 -7)">4</text>
 						</g>
 						<g class="a7 c2 node n5 p0" transform="translate(36.16 45.7876)">
 							<g class="a5 leaf node n2 p0 sample" transform="translate(-18.08 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H 18.08"/>
+								<path class="edge e2" d="M 0 0 V -12.1084 H 18.08"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">2</text>
 							</g>
 							<g class="a5 leaf m7 node n3 p0 s4 sample" transform="translate(18.08 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H -18.08"/>
+								<path class="edge e3" d="M 0 0 V -12.1084 H -18.08"/>
 								<g class="mut m7 s4 unknown_time" transform="translate(0 -6.05422)">
 									<line x1="0" x2="0" y1="0" y2="6.05422"/>
 									<path class="sym" d="M -3,-3 l 6,6 M -3,3 l 6,-6"/>
@@ -361,11 +361,11 @@
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">3</text>
 							</g>
-							<path class="edge" d="M 0 0 V -45.7876 H -36.16"/>
+							<path class="edge e9" d="M 0 0 V -45.7876 H -36.16"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab rgt" transform="translate(3 -7)">5</text>
 						</g>
-						<path class="edge" d="M 0 0 V -12.3778 H 0"/>
+						<path class="edge root" d="M 0 0 V -12.3778 H 0"/>
 						<circle class="sym" cx="0" cy="0" r="3"/>
 						<text class="lab rgt" transform="translate(3 -7)">7</text>
 					</g>
@@ -376,35 +376,35 @@
 					<g class="c2 node n8 p0 root" transform="translate(92.32 49.7389)">
 						<g class="a8 c2 node n4 p0" transform="translate(-36.16 70.4129)">
 							<g class="a4 leaf node n0 p0 sample" transform="translate(-18.08 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H 18.08"/>
+								<path class="edge e0" d="M 0 0 V -1.24828 H 18.08"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">0</text>
 							</g>
 							<g class="a4 leaf node n1 p0 sample" transform="translate(18.08 1.24828)">
-								<path class="edge" d="M 0 0 V -1.24828 H -18.08"/>
+								<path class="edge e1" d="M 0 0 V -1.24828 H -18.08"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">1</text>
 							</g>
-							<path class="edge" d="M 0 0 V -70.4129 H 36.16"/>
+							<path class="edge e10" d="M 0 0 V -70.4129 H 36.16"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab lft" transform="translate(-3 -7)">4</text>
 						</g>
 						<g class="a8 c2 node n5 p0" transform="translate(36.16 59.5527)">
 							<g class="a5 leaf node n2 p0 sample" transform="translate(-18.08 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H 18.08"/>
+								<path class="edge e2" d="M 0 0 V -12.1084 H 18.08"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">2</text>
 							</g>
 							<g class="a5 leaf node n3 p0 sample" transform="translate(18.08 12.1084)">
-								<path class="edge" d="M 0 0 V -12.1084 H -18.08"/>
+								<path class="edge e3" d="M 0 0 V -12.1084 H -18.08"/>
 								<rect class="sym" height="6" width="6" x="-3" y="-3"/>
 								<text class="lab" transform="translate(0 11)">3</text>
 							</g>
-							<path class="edge" d="M 0 0 V -59.5527 H -36.16"/>
+							<path class="edge e11" d="M 0 0 V -59.5527 H -36.16"/>
 							<circle class="sym" cx="0" cy="0" r="3"/>
 							<text class="lab rgt" transform="translate(3 -7)">5</text>
 						</g>
-						<path class="edge" d="M 0 0 V -12.3778 H 0"/>
+						<path class="edge root" d="M 0 0 V -12.3778 H 0"/>
 						<circle class="sym" cx="0" cy="0" r="3"/>
 						<text class="lab rgt" transform="translate(3 -7)">8</text>
 					</g>
diff --git a/python/tests/test_drawing.py b/python/tests/test_drawing.py
index 94253e4695..3be8ab4823 100644
--- a/python/tests/test_drawing.py
+++ b/python/tests/test_drawing.py
@@ -2281,11 +2281,11 @@ def test_no_edges_show_empty(self):
             svg = ts.draw_svg(time_scale=time_scale, x_lim=[0, ts.sequence_length])
             self.verify_basic_svg(svg)
             assert svg.count("<rect") == 10  # Sample nodes are rectangles
-            assert svg.count('<path class="edge"') == 0
+            assert svg.count('<path class="edge') == 0
         svg = ts.draw_svg(force_root_branch=True, x_lim=[0, ts.sequence_length])
         self.verify_basic_svg(svg)
         assert svg.count("<rect") == 10
-        assert svg.count('<path class="edge"') == 10
+        assert svg.count('<path class="edge') == 10
 
     def test_no_edges_with_muts(self):
         # If there is a mutation above a sample, the root branches should be there too
@@ -2299,7 +2299,7 @@ def test_no_edges_with_muts(self):
         svg = ts.draw_svg()
         self.verify_basic_svg(svg)
         assert svg.count("<rect") == 10
-        assert svg.count('<path class="edge"') == 10
+        assert svg.count('<path class="edge') == 10
         assert svg.count('<path class="sym"') == ts.num_mutations
         assert svg.count('<line class="sym"') == ts.num_sites
 
@@ -2435,18 +2435,15 @@ def test_tree_root_branch(self):
         self.verify_basic_svg(svg2a)
         self.verify_basic_svg(svg2b)
         # Last <path> should be the root branch, if it exists
-        edge_str = '<path class="edge" d='
+        edge_str = '<path class="edge root" d='
         str_pos1 = svg1.rfind(edge_str, 0, svg1.find(f">{root1}<"))
-        str_pos2a = svg2a.rfind(edge_str, 0, svg2a.find(f">{root2}<"))
+        assert edge_str not in svg2a
         str_pos2b = svg2b.rfind(edge_str, 0, svg2b.find(f">{root2}<"))
         snippet1 = svg1[str_pos1 + len(edge_str) : svg1.find(">", str_pos1)]
-        snippet2a = svg2a[str_pos2a + len(edge_str) : svg2a.find(">", str_pos2a)]
         snippet2b = svg2b[str_pos2b + len(edge_str) : svg2b.find(">", str_pos2b)]
         assert snippet1.startswith('"M 0 0')
-        assert snippet2a.startswith('"M 0 0')
         assert snippet2b.startswith('"M 0 0')
         assert "H 0" in snippet1
-        assert not ("H 0" in snippet2a)  # No root branch
         assert "H 0" in snippet2b
 
     def test_debug_box(self):
@@ -2491,6 +2488,16 @@ def test_max_num_trees(self, max_trees):
         assert svg.count("site") - site_strings_in_stylesheet == num_sites
         self.verify_basic_svg(svg, width=200 * (max_trees + 1))
 
+    def test_edge_ids(self):
+        ts = self.get_simple_ts()
+        for tree in ts.trees():
+            svg = tree.draw_svg()
+            mut_nodes = {m.node for m in tree.mutations()}
+            assert svg.count('"edge root"') == (1 if tree.root in mut_nodes else 0)
+            edges = {tree.edge(u) for u in tree.nodes()}
+            for e in range(tree.num_edges):
+                assert svg.count(f'"edge e{e}"') == (1 if e in edges else 0)
+
     def test_draw_tree_symbol_titles(self):
         tree = self.get_binary_tree()
         assert tree.tree_sequence.num_mutations > 0
diff --git a/python/tskit/drawing.py b/python/tskit/drawing.py
index 2fe73fe693..10386167bb 100644
--- a/python/tskit/drawing.py
+++ b/python/tskit/drawing.py
@@ -2137,6 +2137,7 @@ def draw_tree(self):
         tree = self.tree
         left_child = get_left_child(tree, self.postorder_nodes)
         parent_array = tree.parent_array
+        edge_array = tree.edge_array
 
         node_info = {}
         roots = []  # Roots of the displated tree
@@ -2224,7 +2225,10 @@ def draw_tree(self):
                     dx, dy = 0, -root_branch_l
                     draw_edge_above_node = True
             if draw_edge_above_node:
-                add_class(self.edge_attrs[u], "edge")
+                edge_id_class = (
+                    "root" if edge_array[u] == tskit.NULL else f"e{edge_array[u]}"
+                )
+                add_class(self.edge_attrs[u], f"edge {edge_id_class}")
                 path = dwg.path(
                     [("M", o), ("V", rnd(dy)), ("H", rnd(dx))], **self.edge_attrs[u]
                 )