From 6f842949edbf8ddbced47b531bf31baa44739c95 Mon Sep 17 00:00:00 2001
From: WPT Sync Bot <josh+wptsync@joshmatthews.net>
Date: Fri, 19 Jun 2020 08:22:28 +0000
Subject: [PATCH] Update web-platform-tests to revision
 e75a8342e588e36a6ab387846a50d077621143b4

---
 .../floats-clear-multicol-000.html.ini        |   2 +
 .../floats-clear-multicol-001.html.ini        |   2 +
 ...oats-clear-multicol-balancing-000.html.ini |   2 +
 ...oats-clear-multicol-balancing-001.html.ini |   2 +
 .../CSS2/floats/hit-test-floats-002.html.ini  |   4 +
 .../CSS2/floats/hit-test-floats-004.html.ini  |   4 +
 .../CSS2/floats/hit-test-floats-005.html.ini  |   4 -
 ...QueryList-addListener-handleEvent.html.ini |   3 -
 .../elementFromPoint-float-in-table.html.ini  |   4 +
 .../elementsFromPoint-iframes.html.ini        |   3 +
 .../elementsFromPoint-invalid-cases.html.ini  |   4 +
 .../fetch/content-type/response.window.js.ini |  16 +-
 .../nosniff/parsing-nosniff.window.js.ini     |   2 +-
 .../traverse_the_history_1.html.ini           |   4 +
 .../traverse_the_history_2.html.ini           |   4 +
 .../traverse_the_history_5.html.ini           |   4 +
 .../embedded-opener-remove-frame.html.ini     |   4 +-
 .../supported-elements.html.ini               |   3 +-
 .../iframe_sandbox_popups_escaping-2.html.ini |   2 +-
 ...rame_sandbox_popups_nonescaping-1.html.ini |   4 +-
 ...rame_sandbox_popups_nonescaping-3.html.ini |   3 +-
 .../inserted-or-removed.html.ini              |  10 +
 .../ignore-opens-during-unload.window.js.ini  |   2 +-
 ...le-event-handler-settings-objects.html.ini |   3 +
 .../webmessaging/without-ports/017.html.ini   |   5 -
 .../semantics/run-a-worker/003.html.ini       |   1 -
 ...d-worker-in-data-url-context.window.js.ini |   5 +-
 tests/wpt/metadata/MANIFEST.json              | 230 ++++++++++++++++--
 .../floats-clear-multicol-000.html.ini        |   2 +
 .../floats-clear-multicol-001.html.ini        |   2 +
 ...oats-clear-multicol-balancing-000.html.ini |   2 +
 ...oats-clear-multicol-balancing-001.html.ini |   2 +
 .../CSS2/floats/hit-test-floats-002.html.ini  |   4 +
 .../CSS2/floats/hit-test-floats-004.html.ini  |   4 +
 .../CSS2/floats/hit-test-floats-005.html.ini  |   4 -
 ...space-separators-break-spaces-008.html.ini |   2 -
 ...QueryList-addListener-handleEvent.html.ini |   3 -
 .../elementFromPoint-float-in-table.html.ini  |   4 +
 .../elementsFromPoint-iframes.html.ini        |   3 +
 .../elementsFromPoint-invalid-cases.html.ini  |   4 +
 .../fetch/content-type/response.window.js.ini |  16 +-
 .../nosniff/parsing-nosniff.window.js.ini     |   2 +-
 .../traverse_the_history_1.html.ini           |   4 +
 .../traverse_the_history_2.html.ini           |   4 +
 .../traverse_the_history_5.html.ini           |   4 +
 .../embedded-opener-remove-frame.html.ini     |   4 +-
 .../supported-elements.html.ini               |   3 +-
 .../iframe_sandbox_popups_escaping-2.html.ini |   2 +-
 ...rame_sandbox_popups_nonescaping-1.html.ini |   4 +-
 ...rame_sandbox_popups_nonescaping-3.html.ini |   3 +-
 .../inserted-or-removed.html.ini              |  10 +
 .../ignore-opens-during-unload.window.js.ini  |   2 +-
 ...le-event-handler-settings-objects.html.ini |   3 +
 .../webmessaging/without-ports/017.html.ini   |   5 -
 .../semantics/run-a-worker/003.html.ini       |   1 -
 ...d-worker-in-data-url-context.window.js.ini |   5 +-
 .../FileAPI/url/url-charset.window.js         |  27 ++
 .../webkit-box-fixed-position-child.html      |  17 ++
 .../floats-clear-multicol-000-ref.html        |  37 +++
 .../floats-clear-multicol-000.html            |  51 ++++
 .../floats-clear-multicol-001.html            |  51 ++++
 .../floats-clear-multicol-002.html            |  51 ++++
 .../floats-clear-multicol-003.html            |  60 +++++
 ...oats-clear-multicol-balancing-000-ref.html |  36 +++
 .../floats-clear-multicol-balancing-000.html  |  50 ++++
 .../floats-clear-multicol-balancing-001.html  |  50 ++++
 .../floats-clear-multicol-balancing-002.html  |  50 ++++
 .../floats-clear-multicol-balancing-003.html  |  59 +++++
 .../always-balancing-before-column-span.html  |  33 +++
 .../no-balancing-after-column-span.html       |  33 +++
 .../elementFromPoint-float-in-table.html      |  60 +++++
 .../eventsource/resources/cors-cookie.py      |  39 ++-
 .../eventsource/resources/cors.py             |  38 +--
 .../eventsource/resources/last-event-id.py    |  12 +-
 .../eventsource/resources/message.py          |  12 +-
 .../eventsource/resources/message2.py         |  36 +--
 .../eventsource/resources/reconnect-fail.py   |  24 +-
 .../eventsource/resources/status-error.py     |  10 +-
 .../eventsource/resources/status-reconnect.py |  20 +-
 .../html/canvas/resources/canvas-tests.js     |   3 +
 .../inserted-or-removed.html                  |  71 ++++++
 .../interfaces/picture-in-picture.idl         |   6 +-
 .../leave-picture-in-picture.html             |  13 +
 .../css/scroll-timeline-cssom.tentative.html  | 184 ++++++++++++++
 .../tools/wpt/requirements.txt                |   2 +-
 .../tools/wptrunner/requirements.txt          |   2 +-
 .../tools/wptrunner/requirements_sauce.txt    |   2 +-
 .../RTCRtpSender-replaceTrack.https.html      |   1 +
 .../webrtc/RTCRtpTransceiver.https.html       |  11 +-
 .../webrtc/simulcast/simulcast.js             |   2 +-
 ...tWindowSegments-iframes.tentative.sub.html |  39 +++
 .../getWindowSegments.https.tentative.html    |  21 ++
 .../post-window-segments-sub-frame.html       |  12 +
 93 files changed, 1476 insertions(+), 193 deletions(-)
 create mode 100644 tests/wpt/metadata-layout-2020/css/CSS2/floats-clear/floats-clear-multicol-000.html.ini
 create mode 100644 tests/wpt/metadata-layout-2020/css/CSS2/floats-clear/floats-clear-multicol-001.html.ini
 create mode 100644 tests/wpt/metadata-layout-2020/css/CSS2/floats-clear/floats-clear-multicol-balancing-000.html.ini
 create mode 100644 tests/wpt/metadata-layout-2020/css/CSS2/floats-clear/floats-clear-multicol-balancing-001.html.ini
 create mode 100644 tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-002.html.ini
 create mode 100644 tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-004.html.ini
 delete mode 100644 tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-005.html.ini
 create mode 100644 tests/wpt/metadata-layout-2020/css/cssom-view/elementFromPoint-float-in-table.html.ini
 create mode 100644 tests/wpt/metadata-layout-2020/css/cssom-view/elementsFromPoint-invalid-cases.html.ini
 create mode 100644 tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini
 create mode 100644 tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_2.html.ini
 create mode 100644 tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini
 create mode 100644 tests/wpt/metadata-layout-2020/html/semantics/forms/the-select-element/inserted-or-removed.html.ini
 delete mode 100644 tests/wpt/metadata-layout-2020/webmessaging/without-ports/017.html.ini
 create mode 100644 tests/wpt/metadata/css/CSS2/floats-clear/floats-clear-multicol-000.html.ini
 create mode 100644 tests/wpt/metadata/css/CSS2/floats-clear/floats-clear-multicol-001.html.ini
 create mode 100644 tests/wpt/metadata/css/CSS2/floats-clear/floats-clear-multicol-balancing-000.html.ini
 create mode 100644 tests/wpt/metadata/css/CSS2/floats-clear/floats-clear-multicol-balancing-001.html.ini
 create mode 100644 tests/wpt/metadata/css/CSS2/floats/hit-test-floats-002.html.ini
 create mode 100644 tests/wpt/metadata/css/CSS2/floats/hit-test-floats-004.html.ini
 delete mode 100644 tests/wpt/metadata/css/CSS2/floats/hit-test-floats-005.html.ini
 delete mode 100644 tests/wpt/metadata/css/css-text/white-space/trailing-other-space-separators-break-spaces-008.html.ini
 create mode 100644 tests/wpt/metadata/css/cssom-view/elementFromPoint-float-in-table.html.ini
 create mode 100644 tests/wpt/metadata/css/cssom-view/elementsFromPoint-invalid-cases.html.ini
 create mode 100644 tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini
 create mode 100644 tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_2.html.ini
 create mode 100644 tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini
 create mode 100644 tests/wpt/metadata/html/semantics/forms/the-select-element/inserted-or-removed.html.ini
 delete mode 100644 tests/wpt/metadata/webmessaging/without-ports/017.html.ini
 create mode 100644 tests/wpt/web-platform-tests/FileAPI/url/url-charset.window.js
 create mode 100644 tests/wpt/web-platform-tests/compat/webkit-box-fixed-position-child.html
 create mode 100644 tests/wpt/web-platform-tests/css/CSS2/floats-clear/floats-clear-multicol-000-ref.html
 create mode 100644 tests/wpt/web-platform-tests/css/CSS2/floats-clear/floats-clear-multicol-000.html
 create mode 100644 tests/wpt/web-platform-tests/css/CSS2/floats-clear/floats-clear-multicol-001.html
 create mode 100644 tests/wpt/web-platform-tests/css/CSS2/floats-clear/floats-clear-multicol-002.html
 create mode 100644 tests/wpt/web-platform-tests/css/CSS2/floats-clear/floats-clear-multicol-003.html
 create mode 100644 tests/wpt/web-platform-tests/css/CSS2/floats-clear/floats-clear-multicol-balancing-000-ref.html
 create mode 100644 tests/wpt/web-platform-tests/css/CSS2/floats-clear/floats-clear-multicol-balancing-000.html
 create mode 100644 tests/wpt/web-platform-tests/css/CSS2/floats-clear/floats-clear-multicol-balancing-001.html
 create mode 100644 tests/wpt/web-platform-tests/css/CSS2/floats-clear/floats-clear-multicol-balancing-002.html
 create mode 100644 tests/wpt/web-platform-tests/css/CSS2/floats-clear/floats-clear-multicol-balancing-003.html
 create mode 100644 tests/wpt/web-platform-tests/css/css-multicol/always-balancing-before-column-span.html
 create mode 100644 tests/wpt/web-platform-tests/css/css-multicol/no-balancing-after-column-span.html
 create mode 100644 tests/wpt/web-platform-tests/css/cssom-view/elementFromPoint-float-in-table.html
 create mode 100644 tests/wpt/web-platform-tests/html/semantics/forms/the-select-element/inserted-or-removed.html
 create mode 100644 tests/wpt/web-platform-tests/scroll-animations/css/scroll-timeline-cssom.tentative.html
 create mode 100644 tests/wpt/web-platform-tests/window-segments/getWindowSegments-iframes.tentative.sub.html
 create mode 100644 tests/wpt/web-platform-tests/window-segments/getWindowSegments.https.tentative.html
 create mode 100644 tests/wpt/web-platform-tests/window-segments/post-window-segments-sub-frame.html

diff --git a/tests/wpt/metadata-layout-2020/css/CSS2/floats-clear/floats-clear-multicol-000.html.ini b/tests/wpt/metadata-layout-2020/css/CSS2/floats-clear/floats-clear-multicol-000.html.ini
new file mode 100644
index 000000000000..d91ccfb56902
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/css/CSS2/floats-clear/floats-clear-multicol-000.html.ini
@@ -0,0 +1,2 @@
+[floats-clear-multicol-000.html]
+  expected: FAIL
diff --git a/tests/wpt/metadata-layout-2020/css/CSS2/floats-clear/floats-clear-multicol-001.html.ini b/tests/wpt/metadata-layout-2020/css/CSS2/floats-clear/floats-clear-multicol-001.html.ini
new file mode 100644
index 000000000000..4c9969190bb8
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/css/CSS2/floats-clear/floats-clear-multicol-001.html.ini
@@ -0,0 +1,2 @@
+[floats-clear-multicol-001.html]
+  expected: FAIL
diff --git a/tests/wpt/metadata-layout-2020/css/CSS2/floats-clear/floats-clear-multicol-balancing-000.html.ini b/tests/wpt/metadata-layout-2020/css/CSS2/floats-clear/floats-clear-multicol-balancing-000.html.ini
new file mode 100644
index 000000000000..b748a3798b74
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/css/CSS2/floats-clear/floats-clear-multicol-balancing-000.html.ini
@@ -0,0 +1,2 @@
+[floats-clear-multicol-balancing-000.html]
+  expected: FAIL
diff --git a/tests/wpt/metadata-layout-2020/css/CSS2/floats-clear/floats-clear-multicol-balancing-001.html.ini b/tests/wpt/metadata-layout-2020/css/CSS2/floats-clear/floats-clear-multicol-balancing-001.html.ini
new file mode 100644
index 000000000000..c0c1e8a7cbe6
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/css/CSS2/floats-clear/floats-clear-multicol-balancing-001.html.ini
@@ -0,0 +1,2 @@
+[floats-clear-multicol-balancing-001.html]
+  expected: FAIL
diff --git a/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-002.html.ini b/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-002.html.ini
new file mode 100644
index 000000000000..f64b45fea6b5
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-002.html.ini
@@ -0,0 +1,4 @@
+[hit-test-floats-002.html]
+  [Hit test float]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-004.html.ini b/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-004.html.ini
new file mode 100644
index 000000000000..4bfb0c2053a4
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-004.html.ini
@@ -0,0 +1,4 @@
+[hit-test-floats-004.html]
+  [Miss float below something else]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-005.html.ini b/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-005.html.ini
deleted file mode 100644
index baa9f1a7541b..000000000000
--- a/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-005.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[hit-test-floats-005.html]
-  [Miss clipped float]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata-layout-2020/css/cssom-view/MediaQueryList-addListener-handleEvent.html.ini b/tests/wpt/metadata-layout-2020/css/cssom-view/MediaQueryList-addListener-handleEvent.html.ini
index d080f72a9622..a6c39d500875 100644
--- a/tests/wpt/metadata-layout-2020/css/cssom-view/MediaQueryList-addListener-handleEvent.html.ini
+++ b/tests/wpt/metadata-layout-2020/css/cssom-view/MediaQueryList-addListener-handleEvent.html.ini
@@ -8,6 +8,3 @@
   [throws if handleEvent is thruthy and not callable]
     expected: FAIL
 
-  [doesn't look up handleEvent method on callable event listeners]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata-layout-2020/css/cssom-view/elementFromPoint-float-in-table.html.ini b/tests/wpt/metadata-layout-2020/css/cssom-view/elementFromPoint-float-in-table.html.ini
new file mode 100644
index 000000000000..87ccfe19bb4d
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/css/cssom-view/elementFromPoint-float-in-table.html.ini
@@ -0,0 +1,4 @@
+[elementFromPoint-float-in-table.html]
+  [float-in-div]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/css/cssom-view/elementsFromPoint-iframes.html.ini b/tests/wpt/metadata-layout-2020/css/cssom-view/elementsFromPoint-iframes.html.ini
index 171592fc08ff..6ef8bb1049ff 100644
--- a/tests/wpt/metadata-layout-2020/css/cssom-view/elementsFromPoint-iframes.html.ini
+++ b/tests/wpt/metadata-layout-2020/css/cssom-view/elementsFromPoint-iframes.html.ini
@@ -2,3 +2,6 @@
   [elementsFromPoint on the root document for points in iframe elements]
     expected: FAIL
 
+  [elementsFromPoint on inner documents]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/css/cssom-view/elementsFromPoint-invalid-cases.html.ini b/tests/wpt/metadata-layout-2020/css/cssom-view/elementsFromPoint-invalid-cases.html.ini
new file mode 100644
index 000000000000..e181af5397fa
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/css/cssom-view/elementsFromPoint-invalid-cases.html.ini
@@ -0,0 +1,4 @@
+[elementsFromPoint-invalid-cases.html]
+  [The root element is the last element returned for otherwise empty queries within the viewport]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/fetch/content-type/response.window.js.ini b/tests/wpt/metadata-layout-2020/fetch/content-type/response.window.js.ini
index 13bea363fb6d..9dbce8f31d42 100644
--- a/tests/wpt/metadata-layout-2020/fetch/content-type/response.window.js.ini
+++ b/tests/wpt/metadata-layout-2020/fetch/content-type/response.window.js.ini
@@ -312,27 +312,27 @@
   [Response: combined response Content-Type: text/html;" \\" text/plain ";charset=GBK]
     expected: NOTRUN
 
-  [<iframe>: separate response Content-Type: text/plain */*]
+  [<iframe>: separate response Content-Type: text/plain */*;charset=gbk]
     expected: FAIL
 
-  [<iframe>: separate response Content-Type: text/html;x=" text/plain]
+  [<iframe>: combined response Content-Type: text/html;" text/plain]
     expected: FAIL
 
-  [<iframe>: separate response Content-Type: text/plain */*;charset=gbk]
+  [<iframe>: combined response Content-Type: text/html;charset=gbk text/plain text/html]
     expected: FAIL
 
-  [<iframe>: combined response Content-Type: text/html;" text/plain]
+  [<iframe>: separate response Content-Type: text/html */*]
     expected: FAIL
 
-  [<iframe>: combined response Content-Type: text/html;charset=gbk text/plain text/html]
+  [<iframe>: combined response Content-Type: text/html */*;charset=gbk]
     expected: FAIL
 
-  [<iframe>: combined response Content-Type: text/html;x=" text/plain]
+  [<iframe>: combined response Content-Type: text/html */*]
     expected: FAIL
 
-  [<iframe>: separate response Content-Type: text/html */*]
+  [<iframe>: separate response Content-Type: text/html;" text/plain]
     expected: FAIL
 
-  [<iframe>: combined response Content-Type: text/html */*;charset=gbk]
+  [<iframe>: separate response Content-Type: text/html */*;charset=gbk]
     expected: FAIL
 
diff --git a/tests/wpt/metadata-layout-2020/fetch/nosniff/parsing-nosniff.window.js.ini b/tests/wpt/metadata-layout-2020/fetch/nosniff/parsing-nosniff.window.js.ini
index 61682d248e2f..aa6eb8f60855 100644
--- a/tests/wpt/metadata-layout-2020/fetch/nosniff/parsing-nosniff.window.js.ini
+++ b/tests/wpt/metadata-layout-2020/fetch/nosniff/parsing-nosniff.window.js.ini
@@ -11,6 +11,6 @@
   [X-Content-Type-Options%3A%20nosniff%2C%2C%40%23%24%23%25%25%26%5E%26%5E*()()11!]
     expected: FAIL
 
-  [X-Content-Type-Options%3A%20%40%23%24%23%25%25%26%5E%26%5E*()()11!%2Cnosniff]
+  [X-Content-Type-Options%3A%20'NosniFF']
     expected: FAIL
 
diff --git a/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini b/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini
new file mode 100644
index 000000000000..87b07c3e6704
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini
@@ -0,0 +1,4 @@
+[traverse_the_history_1.html]
+  [Multiple history traversals from the same task]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_2.html.ini b/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_2.html.ini
new file mode 100644
index 000000000000..75d75b4cda2e
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_2.html.ini
@@ -0,0 +1,4 @@
+[traverse_the_history_2.html]
+  [Multiple history traversals, last would be aborted]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini b/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini
new file mode 100644
index 000000000000..dc2e45516deb
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini
@@ -0,0 +1,4 @@
+[traverse_the_history_5.html]
+  [Multiple history traversals, last would be aborted]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/html/browsers/windows/embedded-opener-remove-frame.html.ini b/tests/wpt/metadata-layout-2020/html/browsers/windows/embedded-opener-remove-frame.html.ini
index 8e2a63e3b7fd..8e2b6af33d8e 100644
--- a/tests/wpt/metadata-layout-2020/html/browsers/windows/embedded-opener-remove-frame.html.ini
+++ b/tests/wpt/metadata-layout-2020/html/browsers/windows/embedded-opener-remove-frame.html.ini
@@ -1,8 +1,8 @@
 [embedded-opener-remove-frame.html]
-  expected: CRASH
+  expected: TIMEOUT
   [opener of discarded nested browsing context]
     expected: FAIL
 
   [opener of discarded auxiliary browsing context]
-    expected: FAIL
+    expected: TIMEOUT
 
diff --git a/tests/wpt/metadata-layout-2020/html/interaction/focus/the-autofocus-attribute/supported-elements.html.ini b/tests/wpt/metadata-layout-2020/html/interaction/focus/the-autofocus-attribute/supported-elements.html.ini
index f45aaafe1c52..3538891dae84 100644
--- a/tests/wpt/metadata-layout-2020/html/interaction/focus/the-autofocus-attribute/supported-elements.html.ini
+++ b/tests/wpt/metadata-layout-2020/html/interaction/focus/the-autofocus-attribute/supported-elements.html.ini
@@ -1,4 +1,5 @@
 [supported-elements.html]
+  expected: TIMEOUT
   [Contenteditable element should support autofocus]
     expected: FAIL
 
@@ -9,7 +10,7 @@
     expected: FAIL
 
   [Area element should support autofocus]
-    expected: FAIL
+    expected: TIMEOUT
 
   [Host element with delegatesFocus should support autofocus]
     expected: FAIL
diff --git a/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-2.html.ini b/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-2.html.ini
index c6f45be1eb28..e63fe7c263eb 100644
--- a/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-2.html.ini
+++ b/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-2.html.ini
@@ -1,5 +1,5 @@
 [iframe_sandbox_popups_escaping-2.html]
-  expected: TIMEOUT
+  expected: CRASH
   [Check that popups from a sandboxed iframe escape the sandbox if\n       allow-popups-to-escape-sandbox is used]
     expected: TIMEOUT
 
diff --git a/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-1.html.ini b/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-1.html.ini
index 0c89d5253df6..d913fcbb1293 100644
--- a/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-1.html.ini
+++ b/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-1.html.ini
@@ -1,5 +1,5 @@
 [iframe_sandbox_popups_nonescaping-1.html]
-  expected: CRASH
+  expected: TIMEOUT
   [Check that popups from a sandboxed iframe do not escape the sandbox]
-    expected: FAIL
+    expected: NOTRUN
 
diff --git a/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini b/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini
index f4f994c5d6f2..7a36937927cf 100644
--- a/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini
+++ b/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini
@@ -1,5 +1,4 @@
 [iframe_sandbox_popups_nonescaping-3.html]
-  expected: TIMEOUT
   [Check that popups from a sandboxed iframe do not escape the sandbox]
-    expected: NOTRUN
+    expected: FAIL
 
diff --git a/tests/wpt/metadata-layout-2020/html/semantics/forms/the-select-element/inserted-or-removed.html.ini b/tests/wpt/metadata-layout-2020/html/semantics/forms/the-select-element/inserted-or-removed.html.ini
new file mode 100644
index 000000000000..961c1cc5f660
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/html/semantics/forms/the-select-element/inserted-or-removed.html.ini
@@ -0,0 +1,10 @@
+[inserted-or-removed.html]
+  [The last selected OPTION should win; Inserted by parser]
+    expected: FAIL
+
+  [The last selected OPTION should win; Inserted by DOM API]
+    expected: FAIL
+
+  [The last selected OPTION should win; Inserted by innerHTML]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/html/webappapis/dynamic-markup-insertion/opening-the-input-stream/ignore-opens-during-unload.window.js.ini b/tests/wpt/metadata-layout-2020/html/webappapis/dynamic-markup-insertion/opening-the-input-stream/ignore-opens-during-unload.window.js.ini
index 58c9d7f8c0c1..57744023f736 100644
--- a/tests/wpt/metadata-layout-2020/html/webappapis/dynamic-markup-insertion/opening-the-input-stream/ignore-opens-during-unload.window.js.ini
+++ b/tests/wpt/metadata-layout-2020/html/webappapis/dynamic-markup-insertion/opening-the-input-stream/ignore-opens-during-unload.window.js.ini
@@ -1,5 +1,5 @@
 [ignore-opens-during-unload.window.html]
-  expected: TIMEOUT
+  expected: CRASH
   [document.open should bail out when ignore-opens-during-unload is greater than 0 during visibilitychange event (open(parent) while unloading parent and child)]
     expected: TIMEOUT
 
diff --git a/tests/wpt/metadata-layout-2020/html/webappapis/scripting/events/compile-event-handler-settings-objects.html.ini b/tests/wpt/metadata-layout-2020/html/webappapis/scripting/events/compile-event-handler-settings-objects.html.ini
index dbec6f2c2ff3..450c88bd32b7 100644
--- a/tests/wpt/metadata-layout-2020/html/webappapis/scripting/events/compile-event-handler-settings-objects.html.ini
+++ b/tests/wpt/metadata-layout-2020/html/webappapis/scripting/events/compile-event-handler-settings-objects.html.ini
@@ -3,3 +3,6 @@
   [The incumbent settings object while executing the compiled callback via Web IDL's invoke must be that of the node document]
     expected: TIMEOUT
 
+  [The entry settings object while executing the compiled callback via Web IDL's invoke must be that of the node document]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/webmessaging/without-ports/017.html.ini b/tests/wpt/metadata-layout-2020/webmessaging/without-ports/017.html.ini
deleted file mode 100644
index 064cf47545b5..000000000000
--- a/tests/wpt/metadata-layout-2020/webmessaging/without-ports/017.html.ini
+++ /dev/null
@@ -1,5 +0,0 @@
-[017.html]
-  expected: TIMEOUT
-  [origin of the script that invoked the method, about:blank]
-    expected: TIMEOUT
-
diff --git a/tests/wpt/metadata-layout-2020/workers/semantics/run-a-worker/003.html.ini b/tests/wpt/metadata-layout-2020/workers/semantics/run-a-worker/003.html.ini
index dd49aa8e457b..c2c57aec558a 100644
--- a/tests/wpt/metadata-layout-2020/workers/semantics/run-a-worker/003.html.ini
+++ b/tests/wpt/metadata-layout-2020/workers/semantics/run-a-worker/003.html.ini
@@ -1,5 +1,4 @@
 [003.html]
-  expected: ERROR
   [shared]
     expected: FAIL
 
diff --git a/tests/wpt/metadata-layout-2020/workers/shared-worker-in-data-url-context.window.js.ini b/tests/wpt/metadata-layout-2020/workers/shared-worker-in-data-url-context.window.js.ini
index 6d92f8835c6f..10dda3a66598 100644
--- a/tests/wpt/metadata-layout-2020/workers/shared-worker-in-data-url-context.window.js.ini
+++ b/tests/wpt/metadata-layout-2020/workers/shared-worker-in-data-url-context.window.js.ini
@@ -1,8 +1,7 @@
 [shared-worker-in-data-url-context.window.html]
-  expected: TIMEOUT
   [Create a shared worker in a data url frame]
-    expected: TIMEOUT
+    expected: FAIL
 
   [Create a data url shared worker in a data url frame]
-    expected: NOTRUN
+    expected: FAIL
 
diff --git a/tests/wpt/metadata/MANIFEST.json b/tests/wpt/metadata/MANIFEST.json
index c6b999823618..a1ad272cab01 100644
--- a/tests/wpt/metadata/MANIFEST.json
+++ b/tests/wpt/metadata/MANIFEST.json
@@ -56084,6 +56084,110 @@
         {}
        ]
       ],
+      "floats-clear-multicol-000.html": [
+       "3598a2f7aba955b5ba3e6ee1739bfd468d2b28ea",
+       [
+        null,
+        [
+         [
+          "/css/CSS2/floats-clear/floats-clear-multicol-000-ref.html",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "floats-clear-multicol-001.html": [
+       "dbcb3b557b918b6b63a9005cd8ff0de6f7c4f8c1",
+       [
+        null,
+        [
+         [
+          "/css/CSS2/floats-clear/floats-clear-multicol-000-ref.html",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "floats-clear-multicol-002.html": [
+       "877ffed2c2f37f2bc3d7808cfdbe3ebed313d91c",
+       [
+        null,
+        [
+         [
+          "/css/CSS2/floats-clear/floats-clear-multicol-000-ref.html",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "floats-clear-multicol-003.html": [
+       "3f951b67f9fcf3c6384ff29c058ee249b36a047c",
+       [
+        null,
+        [
+         [
+          "/css/CSS2/floats-clear/floats-clear-multicol-000-ref.html",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "floats-clear-multicol-balancing-000.html": [
+       "a4f3379eca002adbe13b960198967425f7c13787",
+       [
+        null,
+        [
+         [
+          "/css/CSS2/floats-clear/floats-clear-multicol-balancing-000-ref.html",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "floats-clear-multicol-balancing-001.html": [
+       "9c8f8148d06727ebf1c166811ef4e2c373339a32",
+       [
+        null,
+        [
+         [
+          "/css/CSS2/floats-clear/floats-clear-multicol-balancing-000-ref.html",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "floats-clear-multicol-balancing-002.html": [
+       "e0343b0ce7a0f7030e2c3b1d9ae3d1056a9bebb3",
+       [
+        null,
+        [
+         [
+          "/css/CSS2/floats-clear/floats-clear-multicol-balancing-000-ref.html",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "floats-clear-multicol-balancing-003.html": [
+       "8b68f3ad4ebbf98a67875f4823e8c7a348a80421",
+       [
+        null,
+        [
+         [
+          "/css/CSS2/floats-clear/floats-clear-multicol-balancing-000-ref.html",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
       "margin-collapse-018.xht": [
        "f509ad1ac4f8d7c7af8b4cc86e0089fbb001762b",
        [
@@ -154038,6 +154142,19 @@
      ]
     },
     "css-multicol": {
+     "always-balancing-before-column-span.html": [
+      "a80617b96ef8c4e1061640ac0347c5a5cd96af71",
+      [
+       null,
+       [
+        [
+         "/css/reference/ref-filled-green-100px-square.xht",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
      "as-column-flex-item.html": [
       "21ff8d8d50cf97ecb22cd05cf1ae774d4aa81cdd",
       [
@@ -156989,6 +157106,19 @@
        {}
       ]
      ],
+     "no-balancing-after-column-span.html": [
+      "8c05ffdd27fd774ff5b9061af8c471bd2bcfa1bf",
+      [
+       null,
+       [
+        [
+         "/css/reference/ref-filled-green-100px-square.xht",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
      "orthogonal-writing-mode-shrink-to-fit.html": [
       "b087f56ac6e06d7e11d719976ae66459c97722d7",
       [
@@ -249023,6 +249153,10 @@
      "b5d7176150d0403a87dfd2b9e59af219ddb6b9bb",
      []
     ],
+    "webkit-box-fixed-position-child.html": [
+     "bb61b63133b402e92d0444e7afb3f4c4b9f311c6",
+     []
+    ],
     "webkit-box-horizontal-reverse-variants-ref.html": [
      "72d0b2c6f6851764453f79cf71fc19be73bcb0e8",
      []
@@ -276021,6 +276155,14 @@
        "979298deabb4297507e001085411e55e47fff23c",
        []
       ],
+      "floats-clear-multicol-000-ref.html": [
+       "90c2d6abcbf3d3caa8fce8e2412011037b288a12",
+       []
+      ],
+      "floats-clear-multicol-balancing-000-ref.html": [
+       "78b7ffaf2d1a6db9064d1968a47c65b1540e57b0",
+       []
+      ],
       "margin-collapse-024-ref.xht": [
        "25ad3800bebc8b82976612632456aff51192bc5f",
        []
@@ -321885,11 +322027,11 @@
       []
      ],
      "cors-cookie.py": [
-      "c35824ff437feed72364181b57d7732c170722ab",
+      "9eaab9b95a0b7d44bf57431891a59006676ddb90",
       []
      ],
      "cors.py": [
-      "42a0a0bb5843389674453fc56d8a87c67cd48dcd",
+      "bc0c1089fe374958383aecd70d5da5a91a5b8037",
       []
      ],
      "eventsource-onmessage-realm.htm": [
@@ -321901,7 +322043,7 @@
       []
      ],
      "last-event-id.py": [
-      "2b74bf66a286ff65b386662412018002c762dee2",
+      "a2cb72644570d95c365e5153f3cd2126576affb6",
       []
      ],
      "last-event-id2.py": [
@@ -321909,23 +322051,23 @@
       []
      ],
      "message.py": [
-      "6d04b1fbe40dfbdf16faf2171ef5527a85f3b951",
+      "468564f4df083fca0e4835c2b95cf1fc9201760b",
       []
      ],
      "message2.py": [
-      "ce339d927e3133339123711e5c9cef8c4e75b353",
+      "cfe908406fc1c64bfee94f285d6335f80b5ec722",
       []
      ],
      "reconnect-fail.py": [
-      "80a247d5974bf9351318073ad017fcaed4af3e8a",
+      "12b07700cd0d29ac5988ba0b3bd77db276e2289f",
       []
      ],
      "status-error.py": [
-      "f0a1504bdd363c46259cd744c065039632ca02a8",
+      "ed5687b6c2b93cd1b11c07d4a5e9caf5e154890d",
       []
      ],
      "status-reconnect.py": [
-      "16c6502e3666365c0558cd6db9074acf3e895fa5",
+      "a59f751fc36846725fe7bcbcb2c3f91ea8437d3e",
       []
      ]
     },
@@ -326532,7 +326674,7 @@
        []
       ],
       "canvas-tests.js": [
-       "76313bc8fbac27672128b56cb3327feaf95164e4",
+       "0ccb475b763d1e9d7d6733ff27d93dce56828f3a",
        []
       ],
       "canvas-tests.js.headers": [
@@ -336842,7 +336984,7 @@
      []
     ],
     "picture-in-picture.idl": [
-     "3d3bad08219af2e422f2cb0d4cabeffa1f8a2b80",
+     "195977335603240eeb9f4b1391a5b2e6aa3c2441",
      []
     ],
     "pointerevents.idl": [
@@ -353227,7 +353369,7 @@
       []
      ],
      "requirements.txt": [
-      "3baefa50ea981974be66b6e226e050e59e034c22",
+      "90d0cb6cdc8795c9b39e7644fd330283653b48e4",
       []
      ],
      "revlist.py": [
@@ -353329,7 +353471,7 @@
       ]
      },
      "requirements.txt": [
-      "5310721bbb90fa94b90b4c10d202fc5a13c04d58",
+      "d1d733b86b21cc17978a08b1715d6917e3d3b747",
       []
      ],
      "requirements_android_webview.txt": [
@@ -353377,7 +353519,7 @@
       []
      ],
      "requirements_sauce.txt": [
-      "e9e97647796e7f940f2eef98c72b19871d323c72",
+      "5f70629d81b73302bf0b6ab48a172f761199807d",
       []
      ],
      "requirements_servo.txt": [
@@ -356727,7 +356869,7 @@
     },
     "simulcast": {
      "simulcast.js": [
-      "af804c03e865ae1be94cdc1045f359b30034590a",
+      "018ebf63abf7b213218561b0ae00ff8ba57b800f",
       []
      ]
     },
@@ -359164,6 +359306,12 @@
      []
     ]
    },
+   "window-segments": {
+    "post-window-segments-sub-frame.html": [
+     "f4d1b405305fae75497732add6ad42063d5daaca",
+     []
+    ]
+   },
    "workers": {
     "META.yml": [
      "a7297d3844728b8bb2f7c82a2c4f32d65040a919",
@@ -361312,6 +361460,13 @@
        {}
       ]
      ],
+     "url-charset.window.js": [
+      "4eb103db35d27af9bef1954ce71f6c9f54c48e20",
+      [
+       "FileAPI/url/url-charset.window.html",
+       {}
+      ]
+     ],
      "url-format.any.js": [
       "33732fa61fc3ddd0f52b23fe83ea824cc6abae06",
       [
@@ -407734,6 +407889,13 @@
        {}
       ]
      ],
+     "elementFromPoint-float-in-table.html": [
+      "73713382eacfeba0d46a39165793f5906f15a2eb",
+      [
+       null,
+       {}
+      ]
+     ],
      "elementFromPoint-list-001.html": [
       "b31453d6c32c2c7ed8192dc1e4b5037476645bcd",
       [
@@ -462339,6 +462501,13 @@
          {}
         ]
        ],
+       "inserted-or-removed.html": [
+        "1b3f8631a57c1bd3babcc20d66f6fa08c6be8973",
+        [
+         null,
+         {}
+        ]
+       ],
        "select-add.html": [
         "910be348ae765df079970f4fc7f38cbbf955454d",
         [
@@ -481031,7 +481200,7 @@
      ]
     ],
     "leave-picture-in-picture.html": [
-     "22445c216ef165de88deca5df1e590b5397f6b99",
+     "a0fbcb23e57e1402e51f7f5cbd52da611c0ea691",
      [
       null,
       {
@@ -494305,6 +494474,13 @@
        null,
        {}
       ]
+     ],
+     "scroll-timeline-cssom.tentative.html": [
+      "36fcbf704bd9ef50e6449135abaed9b97f3e727a",
+      [
+       null,
+       {}
+      ]
      ]
     },
     "current-time-nan.html": [
@@ -518748,10 +518924,12 @@
      ]
     ],
     "RTCRtpSender-replaceTrack.https.html": [
-     "77b0fc9594c221d5f8f9fe68950940e992982e99",
+     "a370b6c059a52479cdb62a52adf1e4ab5a5f6b77",
      [
       null,
-      {}
+      {
+       "timeout": "long"
+      }
      ]
     ],
     "RTCRtpSender-setParameters.html": [
@@ -518806,7 +518984,7 @@
      ]
     ],
     "RTCRtpTransceiver.https.html": [
-     "9767417bf376db74903448b703fb3894a82078ff",
+     "487774982298376b7ce27a2cbfaea7ad3c716e28",
      [
       null,
       {
@@ -525509,6 +525687,22 @@
      ]
     ]
    },
+   "window-segments": {
+    "getWindowSegments-iframes.tentative.sub.html": [
+     "188a1180c0248a7ee236614efda91d669fd30fec",
+     [
+      null,
+      {}
+     ]
+    ],
+    "getWindowSegments.https.tentative.html": [
+     "e3821bda40d3ab10c8e7ebf00d47934abca4b168",
+     [
+      null,
+      {}
+     ]
+    ]
+   },
    "workers": {
     "SharedWorker-MessageEvent-source.any.js": [
      "faf48cf9386bfd64030c94041f35f0823aaef79c",
diff --git a/tests/wpt/metadata/css/CSS2/floats-clear/floats-clear-multicol-000.html.ini b/tests/wpt/metadata/css/CSS2/floats-clear/floats-clear-multicol-000.html.ini
new file mode 100644
index 000000000000..d91ccfb56902
--- /dev/null
+++ b/tests/wpt/metadata/css/CSS2/floats-clear/floats-clear-multicol-000.html.ini
@@ -0,0 +1,2 @@
+[floats-clear-multicol-000.html]
+  expected: FAIL
diff --git a/tests/wpt/metadata/css/CSS2/floats-clear/floats-clear-multicol-001.html.ini b/tests/wpt/metadata/css/CSS2/floats-clear/floats-clear-multicol-001.html.ini
new file mode 100644
index 000000000000..4c9969190bb8
--- /dev/null
+++ b/tests/wpt/metadata/css/CSS2/floats-clear/floats-clear-multicol-001.html.ini
@@ -0,0 +1,2 @@
+[floats-clear-multicol-001.html]
+  expected: FAIL
diff --git a/tests/wpt/metadata/css/CSS2/floats-clear/floats-clear-multicol-balancing-000.html.ini b/tests/wpt/metadata/css/CSS2/floats-clear/floats-clear-multicol-balancing-000.html.ini
new file mode 100644
index 000000000000..b748a3798b74
--- /dev/null
+++ b/tests/wpt/metadata/css/CSS2/floats-clear/floats-clear-multicol-balancing-000.html.ini
@@ -0,0 +1,2 @@
+[floats-clear-multicol-balancing-000.html]
+  expected: FAIL
diff --git a/tests/wpt/metadata/css/CSS2/floats-clear/floats-clear-multicol-balancing-001.html.ini b/tests/wpt/metadata/css/CSS2/floats-clear/floats-clear-multicol-balancing-001.html.ini
new file mode 100644
index 000000000000..c0c1e8a7cbe6
--- /dev/null
+++ b/tests/wpt/metadata/css/CSS2/floats-clear/floats-clear-multicol-balancing-001.html.ini
@@ -0,0 +1,2 @@
+[floats-clear-multicol-balancing-001.html]
+  expected: FAIL
diff --git a/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-002.html.ini b/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-002.html.ini
new file mode 100644
index 000000000000..f64b45fea6b5
--- /dev/null
+++ b/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-002.html.ini
@@ -0,0 +1,4 @@
+[hit-test-floats-002.html]
+  [Hit test float]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-004.html.ini b/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-004.html.ini
new file mode 100644
index 000000000000..4bfb0c2053a4
--- /dev/null
+++ b/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-004.html.ini
@@ -0,0 +1,4 @@
+[hit-test-floats-004.html]
+  [Miss float below something else]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-005.html.ini b/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-005.html.ini
deleted file mode 100644
index baa9f1a7541b..000000000000
--- a/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-005.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[hit-test-floats-005.html]
-  [Miss clipped float]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/css/css-text/white-space/trailing-other-space-separators-break-spaces-008.html.ini b/tests/wpt/metadata/css/css-text/white-space/trailing-other-space-separators-break-spaces-008.html.ini
deleted file mode 100644
index f6bf6aa789ee..000000000000
--- a/tests/wpt/metadata/css/css-text/white-space/trailing-other-space-separators-break-spaces-008.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[trailing-other-space-separators-break-spaces-008.html]
-  expected: FAIL
diff --git a/tests/wpt/metadata/css/cssom-view/MediaQueryList-addListener-handleEvent.html.ini b/tests/wpt/metadata/css/cssom-view/MediaQueryList-addListener-handleEvent.html.ini
index d080f72a9622..a6c39d500875 100644
--- a/tests/wpt/metadata/css/cssom-view/MediaQueryList-addListener-handleEvent.html.ini
+++ b/tests/wpt/metadata/css/cssom-view/MediaQueryList-addListener-handleEvent.html.ini
@@ -8,6 +8,3 @@
   [throws if handleEvent is thruthy and not callable]
     expected: FAIL
 
-  [doesn't look up handleEvent method on callable event listeners]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/css/cssom-view/elementFromPoint-float-in-table.html.ini b/tests/wpt/metadata/css/cssom-view/elementFromPoint-float-in-table.html.ini
new file mode 100644
index 000000000000..87ccfe19bb4d
--- /dev/null
+++ b/tests/wpt/metadata/css/cssom-view/elementFromPoint-float-in-table.html.ini
@@ -0,0 +1,4 @@
+[elementFromPoint-float-in-table.html]
+  [float-in-div]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/css/cssom-view/elementsFromPoint-iframes.html.ini b/tests/wpt/metadata/css/cssom-view/elementsFromPoint-iframes.html.ini
index 171592fc08ff..6ef8bb1049ff 100644
--- a/tests/wpt/metadata/css/cssom-view/elementsFromPoint-iframes.html.ini
+++ b/tests/wpt/metadata/css/cssom-view/elementsFromPoint-iframes.html.ini
@@ -2,3 +2,6 @@
   [elementsFromPoint on the root document for points in iframe elements]
     expected: FAIL
 
+  [elementsFromPoint on inner documents]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/css/cssom-view/elementsFromPoint-invalid-cases.html.ini b/tests/wpt/metadata/css/cssom-view/elementsFromPoint-invalid-cases.html.ini
new file mode 100644
index 000000000000..e181af5397fa
--- /dev/null
+++ b/tests/wpt/metadata/css/cssom-view/elementsFromPoint-invalid-cases.html.ini
@@ -0,0 +1,4 @@
+[elementsFromPoint-invalid-cases.html]
+  [The root element is the last element returned for otherwise empty queries within the viewport]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/fetch/content-type/response.window.js.ini b/tests/wpt/metadata/fetch/content-type/response.window.js.ini
index 46cc294317da..165c0887ea4a 100644
--- a/tests/wpt/metadata/fetch/content-type/response.window.js.ini
+++ b/tests/wpt/metadata/fetch/content-type/response.window.js.ini
@@ -312,27 +312,27 @@
   [fetch(): separate response Content-Type: text/plain ]
     expected: NOTRUN
 
-  [<iframe>: separate response Content-Type: text/plain */*]
+  [<iframe>: separate response Content-Type: text/plain */*;charset=gbk]
     expected: FAIL
 
-  [<iframe>: separate response Content-Type: text/html;x=" text/plain]
+  [<iframe>: combined response Content-Type: text/html;" text/plain]
     expected: FAIL
 
-  [<iframe>: separate response Content-Type: text/plain */*;charset=gbk]
+  [<iframe>: combined response Content-Type: text/html;charset=gbk text/plain text/html]
     expected: FAIL
 
-  [<iframe>: combined response Content-Type: text/html;" text/plain]
+  [<iframe>: separate response Content-Type: text/html */*]
     expected: FAIL
 
-  [<iframe>: combined response Content-Type: text/html;charset=gbk text/plain text/html]
+  [<iframe>: combined response Content-Type: text/html */*;charset=gbk]
     expected: FAIL
 
-  [<iframe>: combined response Content-Type: text/html;x=" text/plain]
+  [<iframe>: combined response Content-Type: text/html */*]
     expected: FAIL
 
-  [<iframe>: separate response Content-Type: text/html */*]
+  [<iframe>: separate response Content-Type: text/html;" text/plain]
     expected: FAIL
 
-  [<iframe>: combined response Content-Type: text/html */*;charset=gbk]
+  [<iframe>: separate response Content-Type: text/html */*;charset=gbk]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/fetch/nosniff/parsing-nosniff.window.js.ini b/tests/wpt/metadata/fetch/nosniff/parsing-nosniff.window.js.ini
index 61682d248e2f..aa6eb8f60855 100644
--- a/tests/wpt/metadata/fetch/nosniff/parsing-nosniff.window.js.ini
+++ b/tests/wpt/metadata/fetch/nosniff/parsing-nosniff.window.js.ini
@@ -11,6 +11,6 @@
   [X-Content-Type-Options%3A%20nosniff%2C%2C%40%23%24%23%25%25%26%5E%26%5E*()()11!]
     expected: FAIL
 
-  [X-Content-Type-Options%3A%20%40%23%24%23%25%25%26%5E%26%5E*()()11!%2Cnosniff]
+  [X-Content-Type-Options%3A%20'NosniFF']
     expected: FAIL
 
diff --git a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini
new file mode 100644
index 000000000000..87b07c3e6704
--- /dev/null
+++ b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini
@@ -0,0 +1,4 @@
+[traverse_the_history_1.html]
+  [Multiple history traversals from the same task]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_2.html.ini b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_2.html.ini
new file mode 100644
index 000000000000..75d75b4cda2e
--- /dev/null
+++ b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_2.html.ini
@@ -0,0 +1,4 @@
+[traverse_the_history_2.html]
+  [Multiple history traversals, last would be aborted]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini
new file mode 100644
index 000000000000..dc2e45516deb
--- /dev/null
+++ b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini
@@ -0,0 +1,4 @@
+[traverse_the_history_5.html]
+  [Multiple history traversals, last would be aborted]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/html/browsers/windows/embedded-opener-remove-frame.html.ini b/tests/wpt/metadata/html/browsers/windows/embedded-opener-remove-frame.html.ini
index 2532dceabaca..fd369192a023 100644
--- a/tests/wpt/metadata/html/browsers/windows/embedded-opener-remove-frame.html.ini
+++ b/tests/wpt/metadata/html/browsers/windows/embedded-opener-remove-frame.html.ini
@@ -1,5 +1,5 @@
 [embedded-opener-remove-frame.html]
-  expected: CRASH
+  expected: TIMEOUT
   [opener and "removed" embedded documents]
     expected: FAIL
 
@@ -7,5 +7,5 @@
     expected: FAIL
 
   [opener of discarded auxiliary browsing context]
-    expected: FAIL
+    expected: TIMEOUT
 
diff --git a/tests/wpt/metadata/html/interaction/focus/the-autofocus-attribute/supported-elements.html.ini b/tests/wpt/metadata/html/interaction/focus/the-autofocus-attribute/supported-elements.html.ini
index 6b68e9094e40..d1ca01ebc5fd 100644
--- a/tests/wpt/metadata/html/interaction/focus/the-autofocus-attribute/supported-elements.html.ini
+++ b/tests/wpt/metadata/html/interaction/focus/the-autofocus-attribute/supported-elements.html.ini
@@ -1,4 +1,5 @@
 [supported-elements.html]
+  expected: TIMEOUT
   [Contenteditable element should support autofocus]
     expected: FAIL
 
@@ -9,7 +10,7 @@
     expected: FAIL
 
   [Area element should support autofocus]
-    expected: FAIL
+    expected: TIMEOUT
 
   [Host element with delegatesFocus should support autofocus]
     expected: FAIL
diff --git a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-2.html.ini b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-2.html.ini
index c6f45be1eb28..e63fe7c263eb 100644
--- a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-2.html.ini
+++ b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-2.html.ini
@@ -1,5 +1,5 @@
 [iframe_sandbox_popups_escaping-2.html]
-  expected: TIMEOUT
+  expected: CRASH
   [Check that popups from a sandboxed iframe escape the sandbox if\n       allow-popups-to-escape-sandbox is used]
     expected: TIMEOUT
 
diff --git a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-1.html.ini b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-1.html.ini
index 4bc0524f1055..9df1ac56f2ac 100644
--- a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-1.html.ini
+++ b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-1.html.ini
@@ -1,6 +1,6 @@
 [iframe_sandbox_popups_nonescaping-1.html]
   type: testharness
-  expected: CRASH
+  expected: TIMEOUT
   [Check that popups from a sandboxed iframe do not escape the sandbox]
-    expected: FAIL
+    expected: NOTRUN
 
diff --git a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini
index e440b1e38c61..dc856a3d5a31 100644
--- a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini
+++ b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini
@@ -1,6 +1,5 @@
 [iframe_sandbox_popups_nonescaping-3.html]
   type: testharness
-  expected: TIMEOUT
   [Check that popups from a sandboxed iframe do not escape the sandbox]
-    expected: NOTRUN
+    expected: FAIL
 
diff --git a/tests/wpt/metadata/html/semantics/forms/the-select-element/inserted-or-removed.html.ini b/tests/wpt/metadata/html/semantics/forms/the-select-element/inserted-or-removed.html.ini
new file mode 100644
index 000000000000..961c1cc5f660
--- /dev/null
+++ b/tests/wpt/metadata/html/semantics/forms/the-select-element/inserted-or-removed.html.ini
@@ -0,0 +1,10 @@
+[inserted-or-removed.html]
+  [The last selected OPTION should win; Inserted by parser]
+    expected: FAIL
+
+  [The last selected OPTION should win; Inserted by DOM API]
+    expected: FAIL
+
+  [The last selected OPTION should win; Inserted by innerHTML]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/html/webappapis/dynamic-markup-insertion/opening-the-input-stream/ignore-opens-during-unload.window.js.ini b/tests/wpt/metadata/html/webappapis/dynamic-markup-insertion/opening-the-input-stream/ignore-opens-during-unload.window.js.ini
index 69bd952d7565..910c88d3e81f 100644
--- a/tests/wpt/metadata/html/webappapis/dynamic-markup-insertion/opening-the-input-stream/ignore-opens-during-unload.window.js.ini
+++ b/tests/wpt/metadata/html/webappapis/dynamic-markup-insertion/opening-the-input-stream/ignore-opens-during-unload.window.js.ini
@@ -1,5 +1,5 @@
 [ignore-opens-during-unload.window.html]
-  expected: TIMEOUT
+  expected: CRASH
   [ignore-opens-during-unload]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/html/webappapis/scripting/events/compile-event-handler-settings-objects.html.ini b/tests/wpt/metadata/html/webappapis/scripting/events/compile-event-handler-settings-objects.html.ini
index 0cef5158fae6..01f7b72cbe78 100644
--- a/tests/wpt/metadata/html/webappapis/scripting/events/compile-event-handler-settings-objects.html.ini
+++ b/tests/wpt/metadata/html/webappapis/scripting/events/compile-event-handler-settings-objects.html.ini
@@ -4,3 +4,6 @@
   [The incumbent settings object while executing the compiled callback via Web IDL's invoke must be that of the node document]
     expected: TIMEOUT
 
+  [The entry settings object while executing the compiled callback via Web IDL's invoke must be that of the node document]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/webmessaging/without-ports/017.html.ini b/tests/wpt/metadata/webmessaging/without-ports/017.html.ini
deleted file mode 100644
index 064cf47545b5..000000000000
--- a/tests/wpt/metadata/webmessaging/without-ports/017.html.ini
+++ /dev/null
@@ -1,5 +0,0 @@
-[017.html]
-  expected: TIMEOUT
-  [origin of the script that invoked the method, about:blank]
-    expected: TIMEOUT
-
diff --git a/tests/wpt/metadata/workers/semantics/run-a-worker/003.html.ini b/tests/wpt/metadata/workers/semantics/run-a-worker/003.html.ini
index 49f489d2a1c7..d6e39444229f 100644
--- a/tests/wpt/metadata/workers/semantics/run-a-worker/003.html.ini
+++ b/tests/wpt/metadata/workers/semantics/run-a-worker/003.html.ini
@@ -1,6 +1,5 @@
 [003.html]
   type: testharness
-  expected: ERROR
   [shared]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/workers/shared-worker-in-data-url-context.window.js.ini b/tests/wpt/metadata/workers/shared-worker-in-data-url-context.window.js.ini
index 6d92f8835c6f..10dda3a66598 100644
--- a/tests/wpt/metadata/workers/shared-worker-in-data-url-context.window.js.ini
+++ b/tests/wpt/metadata/workers/shared-worker-in-data-url-context.window.js.ini
@@ -1,8 +1,7 @@
 [shared-worker-in-data-url-context.window.html]
-  expected: TIMEOUT
   [Create a shared worker in a data url frame]
-    expected: TIMEOUT
+    expected: FAIL
 
   [Create a data url shared worker in a data url frame]
-    expected: NOTRUN
+    expected: FAIL
 
diff --git a/tests/wpt/web-platform-tests/FileAPI/url/url-charset.window.js b/tests/wpt/web-platform-tests/FileAPI/url/url-charset.window.js
new file mode 100644
index 000000000000..4eb103db35d2
--- /dev/null
+++ b/tests/wpt/web-platform-tests/FileAPI/url/url-charset.window.js
@@ -0,0 +1,27 @@
+async_test(t => {
+  const blob = new Blob(
+      [
+        `aaa\u001B$@<textarea>\u001B(B<script>/* xss */<\/script></textarea>bbb`
+      ],
+      {type: 'text/html;charset=utf-8'});
+  const url = URL.createObjectURL(blob);
+  const win = window.open(url);
+  t.add_cleanup(() => win.close());
+
+  win.onload = t.step_func_done(() => {
+    assert_equals(win.document.charset, 'UTF-8');
+  });
+}, 'Blob charset should override any auto-detected charset.');
+
+async_test(t => {
+  const blob = new Blob(
+      [`<!doctype html>\n<meta charset="ISO-8859-1">`],
+      {type: 'text/html;charset=utf-8'});
+  const url = URL.createObjectURL(blob);
+  const win = window.open(url);
+  t.add_cleanup(() => win.close());
+
+  win.onload = t.step_func_done(() => {
+    assert_equals(win.document.charset, 'UTF-8');
+  });
+}, 'Blob charset should override <meta charset>.');
diff --git a/tests/wpt/web-platform-tests/compat/webkit-box-fixed-position-child.html b/tests/wpt/web-platform-tests/compat/webkit-box-fixed-position-child.html
new file mode 100644
index 000000000000..bb61b63133b4
--- /dev/null
+++ b/tests/wpt/web-platform-tests/compat/webkit-box-fixed-position-child.html
@@ -0,0 +1,17 @@
+<!doctype html>
+<title>Verifies changing 'display' with a fixed position webkit-box that
+  has a fixed position child</title>
+<body>
+  <div id="outer" style="position:fixed;">
+  <div style="display:-webkit-box; float:left; padding-left:100%;">
+    <div style="position:fixed; width:100px; height:100px;"></div>
+  </div>
+  <div style="display:inline-block; width:100px; height:20px;"></div>
+</div>
+<div id="elm"></div>
+A
+</body>
+<script>
+  document.body.offsetTop;
+  elm.style.display = 'none';
+</script>
diff --git a/tests/wpt/web-platform-tests/css/CSS2/floats-clear/floats-clear-multicol-000-ref.html b/tests/wpt/web-platform-tests/css/CSS2/floats-clear/floats-clear-multicol-000-ref.html
new file mode 100644
index 000000000000..90c2d6abcbf3
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/CSS2/floats-clear/floats-clear-multicol-000-ref.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN">
+<title>CSS Float Test Reference: Test the clear position after the floating elements breaking across multi-columns</title>
+<link rel="author" title="Elika J. Etemad" href="http://fantasai.inkedblade.net/contact"/>
+<link rel="author" title="Ting-Yu Lin" href="mailto:tlin@mozilla.com">
+<link rel="author" title="Mozilla" href="http://www.mozilla.org/">
+
+<style type="text/css">
+.multicol {
+  margin: 1em;
+  border: solid silver;
+  width: 300px;
+  column-width: 100px;
+  column-gap: 0;
+  column-fill: auto;
+  height: 100px;
+}
+
+.container {
+  border: 15px aqua;
+  border-style: none solid;
+  height: 250px;
+}
+.clear {
+  border-bottom: solid orange;
+  background: red;
+}
+</style>
+
+<p>The orange line should be halfway down the third column
+(immediately after the end of the aqua lines).
+
+<div class="multicol">
+  <div class="container">
+  </div>
+  <div class="clear">
+  </div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/CSS2/floats-clear/floats-clear-multicol-000.html b/tests/wpt/web-platform-tests/css/CSS2/floats-clear/floats-clear-multicol-000.html
new file mode 100644
index 000000000000..3598a2f7aba9
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/CSS2/floats-clear/floats-clear-multicol-000.html
@@ -0,0 +1,51 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN">
+<title>CSS Float Test: Test the clear position after the floating elements breaking across multi-columns</title>
+<link rel="author" title="Elika J. Etemad" href="http://fantasai.inkedblade.net/contact"/>
+<link rel="author" title="Ting-Yu Lin" href="mailto:tlin@mozilla.com">
+<link rel="author" title="Mozilla" href="http://www.mozilla.org/">
+<link rel="help" href="https://drafts.csswg.org/css2/visuren.html#flow-control">
+<link rel="match" href="floats-clear-multicol-000-ref.html">
+
+<style type="text/css">
+.multicol {
+  margin: 1em;
+  border: solid silver;
+  width: 300px;
+  column-width: 100px;
+  column-gap: 0;
+  column-fill: auto;
+  height: 100px;
+}
+
+.float {
+  float: right;
+  width: 15px;
+  background: aqua;
+  height: 250px;
+}
+.L {
+  float: left;
+}
+
+.container {
+  width: 100%;
+  background: red;
+}
+
+.clear {
+  border-bottom: solid orange;
+}
+</style>
+
+<p>The orange line should be halfway down the third column
+(immediately after the end of the aqua lines).
+
+<div class="multicol">
+  <div class="container">
+    <div class="float L"></div>
+    <div class="float R"></div>
+  </div>
+  <div class="clear">
+    <br clear="all">
+  </div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/CSS2/floats-clear/floats-clear-multicol-001.html b/tests/wpt/web-platform-tests/css/CSS2/floats-clear/floats-clear-multicol-001.html
new file mode 100644
index 000000000000..dbcb3b557b91
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/CSS2/floats-clear/floats-clear-multicol-001.html
@@ -0,0 +1,51 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN">
+<title>CSS Float Test: Test the clear position after the floating elements breaking across multi-columns</title>
+<link rel="author" title="Elika J. Etemad" href="http://fantasai.inkedblade.net/contact"/>
+<link rel="author" title="Ting-Yu Lin" href="mailto:tlin@mozilla.com">
+<link rel="author" title="Mozilla" href="http://www.mozilla.org/">
+<link rel="help" href="https://drafts.csswg.org/css2/visuren.html#flow-control">
+<link rel="match" href="floats-clear-multicol-000-ref.html">
+
+<style type="text/css">
+.multicol {
+  margin: 1em;
+  border: solid silver;
+  width: 300px;
+  column-width: 100px;
+  column-gap: 0;
+  column-fill: auto;
+  height: 100px;
+}
+
+.float {
+  float: right;
+  width: 15px;
+  background: aqua;
+  height: 250px;
+}
+.L {
+  float: left;
+}
+
+.container {
+  width: 100%;
+}
+
+.clear {
+  border-bottom: solid orange;
+  background: red;
+}
+</style>
+
+<p>The orange line should be halfway down the third column
+(immediately after the end of the aqua lines).
+
+<div class="multicol">
+  <div class="container">
+    <div class="float L"></div>
+    <div class="float R"></div>
+    <br clear="all">
+  </div>
+  <div class="clear">
+  </div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/CSS2/floats-clear/floats-clear-multicol-002.html b/tests/wpt/web-platform-tests/css/CSS2/floats-clear/floats-clear-multicol-002.html
new file mode 100644
index 000000000000..877ffed2c2f3
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/CSS2/floats-clear/floats-clear-multicol-002.html
@@ -0,0 +1,51 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN">
+<title>CSS Float Test: Test the clear position after the floating elements breaking across multi-columns</title>
+<link rel="author" title="Elika J. Etemad" href="http://fantasai.inkedblade.net/contact"/>
+<link rel="author" title="Ting-Yu Lin" href="mailto:tlin@mozilla.com">
+<link rel="author" title="Mozilla" href="http://www.mozilla.org/">
+<link rel="help" href="https://drafts.csswg.org/css2/visuren.html#flow-control">
+<link rel="match" href="floats-clear-multicol-000-ref.html">
+
+<style type="text/css">
+.multicol {
+  margin: 1em;
+  border: solid silver;
+  width: 300px;
+  column-width: 100px;
+  column-gap: 0;
+  column-fill: auto;
+  height: 100px;
+}
+
+.float {
+  float: right;
+  width: 15px;
+  background: aqua;
+  height: 250px;
+}
+.L {
+  float: left;
+}
+
+.container {
+  width: 100%;
+  background: red;
+}
+
+.clear {
+  clear: left;
+  border-bottom: solid orange;
+  background: red;
+}
+</style>
+
+<p>The orange line should be halfway down the third column
+(immediately after the end of the aqua lines).
+
+<div class="multicol">
+  <div class="container">
+    <div class="float L"></div>
+    <div class="float R"></div>
+  </div>
+  <div class="clear"></div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/CSS2/floats-clear/floats-clear-multicol-003.html b/tests/wpt/web-platform-tests/css/CSS2/floats-clear/floats-clear-multicol-003.html
new file mode 100644
index 000000000000..3f951b67f9fc
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/CSS2/floats-clear/floats-clear-multicol-003.html
@@ -0,0 +1,60 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN">
+<title>CSS Float Test: Test the clear position after the floating elements breaking across multi-columns</title>
+<link rel="author" title="Elika J. Etemad" href="http://fantasai.inkedblade.net/contact"/>
+<link rel="author" title="Ting-Yu Lin" href="mailto:tlin@mozilla.com">
+<link rel="author" title="Mozilla" href="http://www.mozilla.org/">
+<link rel="help" href="https://drafts.csswg.org/css2/visuren.html#flow-control">
+<link rel="match" href="floats-clear-multicol-000-ref.html">
+
+<style type="text/css">
+.multicol {
+  margin: 1em;
+  border: solid silver;
+  width: 300px;
+  column-width: 100px;
+  column-gap: 0;
+  column-fill: auto;
+  height: 100px;
+}
+
+.step {
+  height: 10px;
+  border: 15px aqua;
+  border-style: none solid;
+}
+.float {
+  float: right;
+  width: 15px;
+  background: aqua;
+  height: 240px;
+}
+.L {
+  float: left;
+}
+
+.container {
+  width: 100%;
+  background: red;
+}
+
+.clear {
+  clear: left;
+  height: 0;
+  background: red;
+}
+.bar {
+  border-bottom: orange solid;
+}
+</style>
+
+<p>The orange line should be halfway down the third column
+(immediately after the end of the aqua lines).
+
+<div class="multicol">
+  <div class="step"></div>
+  <div class="container">
+    <div class="float L"></div>
+    <div class="float R"></div>
+  </div>
+  <div class="clear"><div class="bar"></div></div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/CSS2/floats-clear/floats-clear-multicol-balancing-000-ref.html b/tests/wpt/web-platform-tests/css/CSS2/floats-clear/floats-clear-multicol-balancing-000-ref.html
new file mode 100644
index 000000000000..78b7ffaf2d1a
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/CSS2/floats-clear/floats-clear-multicol-balancing-000-ref.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN">
+<title>CSS Float Test Reference: Test the clear position after the floating elements breaking across multi-columns</title>
+<link rel="author" title="Elika J. Etemad" href="http://fantasai.inkedblade.net/contact"/>
+<link rel="author" title="Ting-Yu Lin" href="mailto:tlin@mozilla.com">
+<link rel="author" title="Mozilla" href="http://www.mozilla.org/">
+
+<style type="text/css">
+.multicol {
+  margin: 1em;
+  border: solid silver;
+  width: 300px;
+  column-width: 100px;
+  column-gap: 0;
+  height: 100px;
+}
+
+.container {
+  border: 15px aqua;
+  border-style: none solid;
+  height: 250px;
+}
+.clear {
+  border-bottom: solid orange;
+  background: red;
+}
+</style>
+
+<p>The orange line should be in the third column
+(immediately after the end of the aqua lines).
+
+<div class="multicol">
+  <div class="container">
+  </div>
+  <div class="clear">
+  </div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/CSS2/floats-clear/floats-clear-multicol-balancing-000.html b/tests/wpt/web-platform-tests/css/CSS2/floats-clear/floats-clear-multicol-balancing-000.html
new file mode 100644
index 000000000000..a4f3379eca00
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/CSS2/floats-clear/floats-clear-multicol-balancing-000.html
@@ -0,0 +1,50 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN">
+<title>CSS Float Test: Test the clear position after the floating elements breaking across multi-columns</title>
+<link rel="author" title="Elika J. Etemad" href="http://fantasai.inkedblade.net/contact"/>
+<link rel="author" title="Ting-Yu Lin" href="mailto:tlin@mozilla.com">
+<link rel="author" title="Mozilla" href="http://www.mozilla.org/">
+<link rel="help" href="https://drafts.csswg.org/css2/visuren.html#flow-control">
+<link rel="match" href="floats-clear-multicol-balancing-000-ref.html">
+
+<style type="text/css">
+.multicol {
+  margin: 1em;
+  border: solid silver;
+  width: 300px;
+  column-width: 100px;
+  column-gap: 0;
+  height: 100px;
+}
+
+.float {
+  float: right;
+  width: 15px;
+  background: aqua;
+  height: 250px;
+}
+.L {
+  float: left;
+}
+
+.container {
+  width: 100%;
+  background: red;
+}
+
+.clear {
+  border-bottom: solid orange;
+}
+</style>
+
+<p>The orange line should be in the third column
+(immediately after the end of the aqua lines).
+
+<div class="multicol">
+  <div class="container">
+    <div class="float L"></div>
+    <div class="float R"></div>
+  </div>
+  <div class="clear">
+    <br clear="all">
+  </div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/CSS2/floats-clear/floats-clear-multicol-balancing-001.html b/tests/wpt/web-platform-tests/css/CSS2/floats-clear/floats-clear-multicol-balancing-001.html
new file mode 100644
index 000000000000..9c8f8148d067
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/CSS2/floats-clear/floats-clear-multicol-balancing-001.html
@@ -0,0 +1,50 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN">
+<title>CSS Float Test: Test the clear position after the floating elements breaking across multi-columns</title>
+<link rel="author" title="Elika J. Etemad" href="http://fantasai.inkedblade.net/contact"/>
+<link rel="author" title="Ting-Yu Lin" href="mailto:tlin@mozilla.com">
+<link rel="author" title="Mozilla" href="http://www.mozilla.org/">
+<link rel="help" href="https://drafts.csswg.org/css2/visuren.html#flow-control">
+<link rel="match" href="floats-clear-multicol-balancing-000-ref.html">
+
+<style type="text/css">
+.multicol {
+  margin: 1em;
+  border: solid silver;
+  width: 300px;
+  column-width: 100px;
+  column-gap: 0;
+  height: 100px;
+}
+
+.float {
+  float: right;
+  width: 15px;
+  background: aqua;
+  height: 250px;
+}
+.L {
+  float: left;
+}
+
+.container {
+  width: 100%;
+}
+
+.clear {
+  border-bottom: solid orange;
+  background: red;
+}
+</style>
+
+<p>The orange line should be in the third column
+(immediately after the end of the aqua lines).
+
+<div class="multicol">
+  <div class="container">
+    <div class="float L"></div>
+    <div class="float R"></div>
+    <br clear="all">
+  </div>
+  <div class="clear">
+  </div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/CSS2/floats-clear/floats-clear-multicol-balancing-002.html b/tests/wpt/web-platform-tests/css/CSS2/floats-clear/floats-clear-multicol-balancing-002.html
new file mode 100644
index 000000000000..e0343b0ce7a0
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/CSS2/floats-clear/floats-clear-multicol-balancing-002.html
@@ -0,0 +1,50 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN">
+<title>CSS Float Test: Test the clear position after the floating elements breaking across multi-columns</title>
+<link rel="author" title="Elika J. Etemad" href="http://fantasai.inkedblade.net/contact"/>
+<link rel="author" title="Ting-Yu Lin" href="mailto:tlin@mozilla.com">
+<link rel="author" title="Mozilla" href="http://www.mozilla.org/">
+<link rel="help" href="https://drafts.csswg.org/css2/visuren.html#flow-control">
+<link rel="match" href="floats-clear-multicol-balancing-000-ref.html">
+
+<style type="text/css">
+.multicol {
+  margin: 1em;
+  border: solid silver;
+  width: 300px;
+  column-width: 100px;
+  column-gap: 0;
+  height: 100px;
+}
+
+.float {
+  float: right;
+  width: 15px;
+  background: aqua;
+  height: 250px;
+}
+.L {
+  float: left;
+}
+
+.container {
+  width: 100%;
+  background: red;
+}
+
+.clear {
+  clear: left;
+  border-bottom: solid orange;
+  background: red;
+}
+</style>
+
+<p>The orange line should be in the third column
+(immediately after the end of the aqua lines).
+
+<div class="multicol">
+  <div class="container">
+    <div class="float L"></div>
+    <div class="float R"></div>
+  </div>
+  <div class="clear"></div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/CSS2/floats-clear/floats-clear-multicol-balancing-003.html b/tests/wpt/web-platform-tests/css/CSS2/floats-clear/floats-clear-multicol-balancing-003.html
new file mode 100644
index 000000000000..8b68f3ad4ebb
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/CSS2/floats-clear/floats-clear-multicol-balancing-003.html
@@ -0,0 +1,59 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN">
+<title>CSS Float Test: Test the clear position after the floating elements breaking across multi-columns</title>
+<link rel="author" title="Elika J. Etemad" href="http://fantasai.inkedblade.net/contact"/>
+<link rel="author" title="Ting-Yu Lin" href="mailto:tlin@mozilla.com">
+<link rel="author" title="Mozilla" href="http://www.mozilla.org/">
+<link rel="help" href="https://drafts.csswg.org/css2/visuren.html#flow-control">
+<link rel="match" href="floats-clear-multicol-balancing-000-ref.html">
+
+<style type="text/css">
+.multicol {
+  margin: 1em;
+  border: solid silver;
+  width: 300px;
+  column-width: 100px;
+  column-gap: 0;
+  height: 100px;
+}
+
+.step {
+  height: 10px;
+  border: 15px aqua;
+  border-style: none solid;
+}
+.float {
+  float: right;
+  width: 15px;
+  background: aqua;
+  height: 240px;
+}
+.L {
+  float: left;
+}
+
+.container {
+  width: 100%;
+  background: red;
+}
+
+.clear {
+  clear: left;
+  height: 0;
+  background: red;
+}
+.bar {
+  border-bottom: orange solid;
+}
+</style>
+
+<p>The orange line should be in the third column
+(immediately after the end of the aqua lines).
+
+<div class="multicol">
+  <div class="step"></div>
+  <div class="container">
+    <div class="float L"></div>
+    <div class="float R"></div>
+  </div>
+  <div class="clear"><div class="bar"></div></div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-multicol/always-balancing-before-column-span.html b/tests/wpt/web-platform-tests/css/css-multicol/always-balancing-before-column-span.html
new file mode 100644
index 000000000000..a80617b96ef8
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-multicol/always-balancing-before-column-span.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<html>
+  <meta charset="utf-8">
+  <link rel="author" title="Ting-Yu Lin" href="mailto:tlin@mozilla.com">
+  <link rel="author" title="Mozilla" href="http://www.mozilla.org/">
+  <link rel="help" href="https://drafts.csswg.org/css-multicol-1/#column-span">
+  <link rel="help" href="https://github.com/w3c/csswg-drafts/issues/4689">
+  <link rel="match" href="../reference/ref-filled-green-100px-square.xht">
+  <meta name="assert" content="This test verifies columns are always balancing before column-spanning element in an unconstrained height and column-fill:auto column container.">
+
+  <style>
+  .columns {
+    column-fill: auto;
+    column-count: 2;
+    column-gap: 0;
+    width: 100px;
+    background: red;
+  }
+  .colspan {
+    column-span: all;
+  }
+  .content {
+    height: 200px;
+    background: green;
+  }
+  </style>
+
+  <p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+  <div class="columns">
+    <div class="content"></div>
+    <div class="colspan"></div>
+  </div>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-multicol/no-balancing-after-column-span.html b/tests/wpt/web-platform-tests/css/css-multicol/no-balancing-after-column-span.html
new file mode 100644
index 000000000000..8c05ffdd27fd
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-multicol/no-balancing-after-column-span.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<html>
+  <meta charset="utf-8">
+  <link rel="author" title="Ting-Yu Lin" href="mailto:tlin@mozilla.com">
+  <link rel="author" title="Mozilla" href="http://www.mozilla.org/">
+  <link rel="help" href="https://drafts.csswg.org/css-multicol-1/#column-span">
+  <link rel="help" href="https://github.com/w3c/csswg-drafts/issues/4689">
+  <link rel="match" href="../reference/ref-filled-green-100px-square.xht">
+  <meta name="assert" content="This test verifies columns are not balancing after a column-spanning element in a fixed height and column-fill:auto column container.">
+
+  <style>
+  .columns {
+    column-fill: auto;
+    column-count: 2;
+    column-gap: 0;
+    width: 200px;
+    height: 100px;
+  }
+  .colspan {
+    column-span: all;
+  }
+  .content {
+    height: 100px;
+    background: green;
+  }
+  </style>
+
+  <p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+  <div class="columns">
+    <div class="colspan"></div>
+    <div class="content"></div>
+  </div>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/cssom-view/elementFromPoint-float-in-table.html b/tests/wpt/web-platform-tests/css/cssom-view/elementFromPoint-float-in-table.html
new file mode 100644
index 000000000000..73713382eacf
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/cssom-view/elementFromPoint-float-in-table.html
@@ -0,0 +1,60 @@
+<!DOCTYPE html>
+<link rel="help" href="http://www.w3.org/TR/CSS21/visuren.html#floats" />
+<link rel="help" href="https://drafts.csswg.org/cssom-view/#dom-document-elementfrompoint" />
+<link rel="author" title="Koji Ishii" href="mailto:kojii@chromium.org">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style>
+.outer {
+  width: 100px;
+  height: 100px;
+  background: green;
+}
+.inner {
+  float: left;
+  width: 50px;
+  height: 50px;
+  background: blue;
+}
+</style>
+<body>
+<div id="log"></div>
+
+<div class="outer" onclick="clicked('outer')">
+  <div id="float-in-div" class="inner" onclick="clicked('inner')">
+  </div>
+</div>
+
+<table>
+  <tr>
+    <td>
+      <div class="outer" onclick="clicked('outer')">
+        <div id='float-in-table' class="inner" onclick="clicked('inner')">
+        </div>
+      </div>
+    </td>
+  </tr>
+</table>
+
+<pre id="output"></pre>
+<script>
+function clicked(p) {
+  output.textContent += 'clicked ' + p + '\n';
+}
+
+function testElementFromPoint(element) {
+  let bounds = element.getBoundingClientRect();
+  let result = document.elementFromPoint(bounds.x + 1, bounds.y + 1);
+  assert_equals(result, element);
+}
+
+let targets = [
+  'float-in-div',
+  'float-in-table',
+];
+for (let target of targets) {
+  let element = document.getElementById(target);
+  test(() => { testElementFromPoint(element); }, target);
+}
+</script>
+</body>
diff --git a/tests/wpt/web-platform-tests/eventsource/resources/cors-cookie.py b/tests/wpt/web-platform-tests/eventsource/resources/cors-cookie.py
index c35824ff437f..9eaab9b95a0b 100644
--- a/tests/wpt/web-platform-tests/eventsource/resources/cors-cookie.py
+++ b/tests/wpt/web-platform-tests/eventsource/resources/cors-cookie.py
@@ -1,32 +1,31 @@
 from datetime import datetime
-from six import ensure_str
 
 def main(request, response):
-    last_event_id = ensure_str(request.headers.get("Last-Event-Id", ""))
-    ident = request.GET.first('ident', "test")
-    cookie = "COOKIE" if ident in request.cookies else "NO_COOKIE"
-    origin = request.GET.first('origin', request.headers["origin"])
-    credentials = request.GET.first('credentials', 'true')
+    last_event_id = request.headers.get(b"Last-Event-Id", b"")
+    ident = request.GET.first(b'ident', b"test")
+    cookie = b"COOKIE" if ident in request.cookies else b"NO_COOKIE"
+    origin = request.GET.first(b'origin', request.headers[b"origin"])
+    credentials = request.GET.first(b'credentials', b'true')
 
     headers = []
 
-    if origin != 'none':
-        headers.append(("Access-Control-Allow-Origin", origin));
+    if origin != b'none':
+        headers.append((b"Access-Control-Allow-Origin", origin));
 
-    if credentials != 'none':
-        headers.append(("Access-Control-Allow-Credentials", credentials));
+    if credentials != b'none':
+        headers.append((b"Access-Control-Allow-Credentials", credentials));
 
-    if last_event_id == '':
-        headers.append(("Content-Type", "text/event-stream"))
-        response.set_cookie(ident, "COOKIE")
-        data = "id: 1\nretry: 200\ndata: first %s\n\n" % cookie
-    elif last_event_id == '1':
-        headers.append(("Content-Type", "text/event-stream"))
+    if last_event_id == b'':
+        headers.append((b"Content-Type", b"text/event-stream"))
+        response.set_cookie(ident, b"COOKIE")
+        data = b"id: 1\nretry: 200\ndata: first %s\n\n" % cookie
+    elif last_event_id == b'1':
+        headers.append((b"Content-Type", b"text/event-stream"))
         long_long_time_ago = datetime.now().replace(year=2001, month=7, day=27)
-        response.set_cookie(ident, "COOKIE", expires=long_long_time_ago)
-        data = "id: 2\ndata: second %s\n\n" % cookie
+        response.set_cookie(ident, b"COOKIE", expires=long_long_time_ago)
+        data = b"id: 2\ndata: second %s\n\n" % cookie
     else:
-        headers.append(("Content-Type", "stop"))
-        data = "data: " + last_event_id + cookie + "\n\n";
+        headers.append((b"Content-Type", b"stop"))
+        data = b"data: " + last_event_id + cookie + b"\n\n";
 
     return headers, data
diff --git a/tests/wpt/web-platform-tests/eventsource/resources/cors.py b/tests/wpt/web-platform-tests/eventsource/resources/cors.py
index 42a0a0bb5843..bc0c1089fe37 100644
--- a/tests/wpt/web-platform-tests/eventsource/resources/cors.py
+++ b/tests/wpt/web-platform-tests/eventsource/resources/cors.py
@@ -1,34 +1,36 @@
 import os
 from wptserve import pipes
 
+from wptserve.utils import isomorphic_decode
+
 def run_other(request, response, path):
     #This is a terrible hack
-    environ = {"__file__": path}
-    exec(compile(open(path, "r").read(), path, 'exec'), environ, environ)
-    rv = environ["main"](request, response)
+    environ = {u"__file__": path}
+    exec(compile(open(path, u"r").read(), path, u'exec'), environ, environ)
+    rv = environ[u"main"](request, response)
     return rv
 
 def main(request, response):
-    origin = request.GET.first("origin", request.headers["origin"])
-    credentials = request.GET.first("credentials", "true")
+    origin = request.GET.first(b"origin", request.headers[b"origin"])
+    credentials = request.GET.first(b"credentials", b"true")
 
-    response.headers.update([("Access-Control-Allow-Origin", origin),
-                             ("Access-Control-Allow-Credentials", credentials)])
+    response.headers.update([(b"Access-Control-Allow-Origin", origin),
+                             (b"Access-Control-Allow-Credentials", credentials)])
 
-    handler = request.GET.first('run')
-    if handler in ["status-reconnect",
-                   "message",
-                   "redirect",
-                   "cache-control"]:
-        if handler == "cache-control":
-            response.headers.set("Content-Type", "text/event-stream")
-            rv = open(os.path.join(request.doc_root, "eventsource", "resources", "cache-control.event_stream"), "r").read()
+    handler = request.GET.first(b'run')
+    if handler in [b"status-reconnect",
+                   b"message",
+                   b"redirect",
+                   b"cache-control"]:
+        if handler == b"cache-control":
+            response.headers.set(b"Content-Type", b"text/event-stream")
+            rv = open(os.path.join(request.doc_root, u"eventsource", u"resources", u"cache-control.event_stream"), u"r").read()
             response.content = rv
             pipes.sub(request, response)
             return
-        elif handler == "redirect":
-            return run_other(request, response, os.path.join(request.doc_root, "common", "redirect.py"))
+        elif handler == b"redirect":
+            return run_other(request, response, os.path.join(request.doc_root, u"common", u"redirect.py"))
         else:
-            return run_other(request, response, os.path.join(os.path.split(__file__)[0], handler + ".py"))
+            return run_other(request, response, os.path.join(os.path.split(isomorphic_decode(__file__))[0], isomorphic_decode(handler) + u".py"))
     else:
         return
diff --git a/tests/wpt/web-platform-tests/eventsource/resources/last-event-id.py b/tests/wpt/web-platform-tests/eventsource/resources/last-event-id.py
index 2b74bf66a286..a2cb72644570 100644
--- a/tests/wpt/web-platform-tests/eventsource/resources/last-event-id.py
+++ b/tests/wpt/web-platform-tests/eventsource/resources/last-event-id.py
@@ -1,11 +1,9 @@
-from six import ensure_str
-
 def main(request, response):
-  response.headers.set("Content-Type", "text/event-stream")
+  response.headers.set(b"Content-Type", b"text/event-stream")
 
-  last_event_id = ensure_str(request.headers.get("Last-Event-ID", ""))
+  last_event_id = request.headers.get(b"Last-Event-ID", b"")
   if last_event_id:
-    return "data: " + last_event_id + "\n\n"
+    return b"data: " + last_event_id + b"\n\n"
   else:
-    idvalue = request.GET.first("idvalue", u"\u2026")
-    return "id: " + idvalue + "\nretry: 200\ndata: hello\n\n"
+    idvalue = request.GET.first(b"idvalue", u"\u2026".encode("utf-8"))
+    return b"id: " + idvalue + b"\nretry: 200\ndata: hello\n\n"
diff --git a/tests/wpt/web-platform-tests/eventsource/resources/message.py b/tests/wpt/web-platform-tests/eventsource/resources/message.py
index 6d04b1fbe40d..468564f4df08 100644
--- a/tests/wpt/web-platform-tests/eventsource/resources/message.py
+++ b/tests/wpt/web-platform-tests/eventsource/resources/message.py
@@ -1,13 +1,13 @@
 import time
 
 def main(request, response):
-    mime = request.GET.first("mime", "text/event-stream")
-    message = request.GET.first("message", "data: data");
-    newline = "" if request.GET.first("newline", None) == "none" else "\n\n";
-    sleep = int(request.GET.first("sleep", "0"))
+    mime = request.GET.first(b"mime", b"text/event-stream")
+    message = request.GET.first(b"message", b"data: data");
+    newline = b"" if request.GET.first(b"newline", None) == b"none" else b"\n\n";
+    sleep = int(request.GET.first(b"sleep", b"0"))
 
-    headers = [("Content-Type", mime)]
-    body = message + newline + "\n"
+    headers = [(b"Content-Type", mime)]
+    body = message + newline + b"\n"
     if sleep != 0:
         time.sleep(sleep/1000)
 
diff --git a/tests/wpt/web-platform-tests/eventsource/resources/message2.py b/tests/wpt/web-platform-tests/eventsource/resources/message2.py
index ce339d927e31..cfe908406fc1 100644
--- a/tests/wpt/web-platform-tests/eventsource/resources/message2.py
+++ b/tests/wpt/web-platform-tests/eventsource/resources/message2.py
@@ -1,35 +1,35 @@
 import time
 
 def main(request, response):
-    response.headers.set('Content-Type', 'text/event-stream')
-    response.headers.set('Cache-Control', 'no-cache')
+    response.headers.set(b'Content-Type', b'text/event-stream')
+    response.headers.set(b'Cache-Control', b'no-cache')
 
     response.explicit_flush = True
     response.write_status_headers()
 
     while True:
-        response.writer.write("data:msg")
-        response.writer.write("\n")
-        response.writer.write("data: msg")
-        response.writer.write("\n\n")
+        response.writer.write(u"data:msg")
+        response.writer.write(u"\n")
+        response.writer.write(u"data: msg")
+        response.writer.write(u"\n\n")
 
-        response.writer.write(":")
-        response.writer.write("\n")
+        response.writer.write(u":")
+        response.writer.write(u"\n")
 
-        response.writer.write("falsefield:msg")
-        response.writer.write("\n\n")
+        response.writer.write(u"falsefield:msg")
+        response.writer.write(u"\n\n")
 
-        response.writer.write("falsefield:msg")
-        response.writer.write("\n")
+        response.writer.write(u"falsefield:msg")
+        response.writer.write(u"\n")
 
-        response.writer.write("Data:data")
-        response.writer.write("\n\n")
+        response.writer.write(u"Data:data")
+        response.writer.write(u"\n\n")
 
-        response.writer.write("data")
-        response.writer.write("\n\n")
+        response.writer.write(u"data")
+        response.writer.write(u"\n\n")
 
-        response.writer.write("data:end")
-        response.writer.write("\n\n")
+        response.writer.write(u"data:end")
+        response.writer.write(u"\n\n")
 
         response.writer.flush()
         time.sleep(2)
diff --git a/tests/wpt/web-platform-tests/eventsource/resources/reconnect-fail.py b/tests/wpt/web-platform-tests/eventsource/resources/reconnect-fail.py
index 80a247d5974b..12b07700cd0d 100644
--- a/tests/wpt/web-platform-tests/eventsource/resources/reconnect-fail.py
+++ b/tests/wpt/web-platform-tests/eventsource/resources/reconnect-fail.py
@@ -1,24 +1,24 @@
 def main(request, response):
-    name = "recon_fail_" + request.GET.first("id")
+    name = b"recon_fail_" + request.GET.first(b"id")
 
-    headers = [("Content-Type", "text/event-stream")]
+    headers = [(b"Content-Type", b"text/event-stream")]
     cookie = request.cookies.first(name, None)
     state = cookie.value if cookie is not None else None
 
-    if state == 'opened':
-        status = (200, "RECONNECT")
-        response.set_cookie(name, "reconnected");
-        body = "data: reconnected\n\n";
+    if state == b'opened':
+        status = (200, b"RECONNECT")
+        response.set_cookie(name, b"reconnected");
+        body = b"data: reconnected\n\n";
 
-    elif state == 'reconnected':
-        status = (204, "NO CONTENT (CLOSE)")
+    elif state == b'reconnected':
+        status = (204, b"NO CONTENT (CLOSE)")
         response.delete_cookie(name);
-        body = "data: closed\n\n" # Will never get through
+        body = b"data: closed\n\n" # Will never get through
 
     else:
-        status = (200, "OPEN");
-        response.set_cookie(name, "opened");
-        body = "retry: 2\ndata: opened\n\n";
+        status = (200, b"OPEN");
+        response.set_cookie(name, b"opened");
+        body = b"retry: 2\ndata: opened\n\n";
 
     return status, headers, body
 
diff --git a/tests/wpt/web-platform-tests/eventsource/resources/status-error.py b/tests/wpt/web-platform-tests/eventsource/resources/status-error.py
index f0a1504bdd36..ed5687b6c2b9 100644
--- a/tests/wpt/web-platform-tests/eventsource/resources/status-error.py
+++ b/tests/wpt/web-platform-tests/eventsource/resources/status-error.py
@@ -1,15 +1,15 @@
 def main(request, response):
-  status = (request.GET.first("status", "404"), "HAHAHAHA")
-  headers = [("Content-Type", "text/event-stream")]
+  status = (request.GET.first(b"status", b"404"), b"HAHAHAHA")
+  headers = [(b"Content-Type", b"text/event-stream")]
 
   # According to RFC7231, HTTP responses bearing status code 204 or 205 must
   # not specify a body. The expected browser behavior for this condition is not
   # currently defined--see the following for further discussion:
   #
   # https://github.com/web-platform-tests/wpt/pull/5227
-  if status[0] in ["204", "205"]:
-      body = ""
+  if status[0] in [b"204", b"205"]:
+      body = b""
   else:
-      body = "data: data\n\n"
+      body = b"data: data\n\n"
 
   return status, headers, body
diff --git a/tests/wpt/web-platform-tests/eventsource/resources/status-reconnect.py b/tests/wpt/web-platform-tests/eventsource/resources/status-reconnect.py
index 16c6502e3666..a59f751fc368 100644
--- a/tests/wpt/web-platform-tests/eventsource/resources/status-reconnect.py
+++ b/tests/wpt/web-platform-tests/eventsource/resources/status-reconnect.py
@@ -1,21 +1,21 @@
 def main(request, response):
-    status_code = request.GET.first("status", "204")
-    name = request.GET.first("id", status_code)
+    status_code = request.GET.first(b"status", b"204")
+    name = request.GET.first(b"id", status_code)
 
-    headers = [("Content-Type", "text/event-stream")]
+    headers = [(b"Content-Type", b"text/event-stream")]
 
-    cookie_name = "request" + name
+    cookie_name = b"request" + name
 
-    if request.cookies.first(cookie_name, "") == status_code:
+    if request.cookies.first(cookie_name, b"") == status_code:
         status = 200
         response.delete_cookie(cookie_name)
-        body = "data: data\n\n"
+        body = b"data: data\n\n"
     else:
         response.set_cookie(cookie_name, status_code);
-        status = (int(status_code), "TEST")
-        body = "retry: 2\n"
-        if "ok_first" in request.GET:
-            body += "data: ok\n\n"
+        status = (int(status_code), b"TEST")
+        body = b"retry: 2\n"
+        if b"ok_first" in request.GET:
+            body += b"data: ok\n\n"
 
     return status, headers, body
 
diff --git a/tests/wpt/web-platform-tests/html/canvas/resources/canvas-tests.js b/tests/wpt/web-platform-tests/html/canvas/resources/canvas-tests.js
index 76313bc8fbac..0ccb475b763d 100644
--- a/tests/wpt/web-platform-tests/html/canvas/resources/canvas-tests.js
+++ b/tests/wpt/web-platform-tests/html/canvas/resources/canvas-tests.js
@@ -144,6 +144,7 @@ function forEachCanvasSource(crossOriginUrl, sameOriginUrl, callback) {
         return new Promise((resolve, reject) => {
           const video = document.createElement("video");
           video.oncanplaythrough = () => resolve(video);
+          video.preload = "auto";
           video.onerror = reject;
           video.src = getVideoURI(crossOriginUrl + "/media/movie_300");
         });
@@ -156,6 +157,7 @@ function forEachCanvasSource(crossOriginUrl, sameOriginUrl, callback) {
         return new Promise((resolve, reject) => {
           const video = document.createElement("video");
           video.oncanplaythrough = () => resolve(video);
+          video.preload = "auto";
           video.onerror = reject;
           video.src = "/common/redirect.py?location=" + getVideoURI(crossOriginUrl + "/media/movie_300");
         });
@@ -168,6 +170,7 @@ function forEachCanvasSource(crossOriginUrl, sameOriginUrl, callback) {
         return new Promise((resolve, reject) => {
           const video = document.createElement("video");
           video.oncanplaythrough = () => resolve(video);
+          video.preload = "auto";
           video.onerror = reject;
           video.src = crossOriginUrl + "/common/redirect.py?location=" + getVideoURI(sameOriginUrl + "/media/movie_300");
         });
diff --git a/tests/wpt/web-platform-tests/html/semantics/forms/the-select-element/inserted-or-removed.html b/tests/wpt/web-platform-tests/html/semantics/forms/the-select-element/inserted-or-removed.html
new file mode 100644
index 000000000000..1b3f8631a57c
--- /dev/null
+++ b/tests/wpt/web-platform-tests/html/semantics/forms/the-select-element/inserted-or-removed.html
@@ -0,0 +1,71 @@
+<!DOCTYPE html>
+<link rel="help" href="https://html.spec.whatwg.org/C/#the-select-element:nodes-are-inserted">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<body>
+
+<select id="by-parser">
+<option selected>First</option>
+<option selected>Second</option>
+</select>
+
+<select id="by-parser-optgroup">
+<optgroup>
+<option selected>First</option>
+<option selected>Second</option>
+</optgroup>
+</select>
+
+<select id="by-dom"></select>
+
+<select id="by-innerHTML"></select>
+
+<script>
+test(() => {
+  const target = document.querySelector("#by-parser");
+  assert_equals(target.selectedOptions[0].textContent, 'Second');
+
+  const target2 = document.querySelector("#by-parser-optgroup");
+  assert_equals(target2.selectedOptions[0].textContent, 'Second');
+}, 'The last selected OPTION should win; Inserted by parser');
+
+test(() => {
+  const target = document.querySelector("#by-dom");
+  const option1 = document.createElement('option');
+  option1.defaultSelected = true;
+  option1.textContent = 'First';
+  const option2 = document.createElement('option');
+  option2.defaultSelected = true;
+  option2.textContent = 'Second';
+  target.appendChild(option1);
+  target.appendChild(option2);
+  assert_equals(target.selectedOptions[0].textContent, 'Second');
+
+  target.innerHTML = '';
+  const optgroup = document.createElement('optgroup');
+  const option3 = document.createElement('option');
+  option3.defaultSelected = true;
+  option3.textContent = 'First';
+  const option4 = document.createElement('option');
+  option4.defaultSelected = true;
+  option4.textContent = 'Second';
+  optgroup.appendChild(option3);
+  optgroup.appendChild(option4);
+  target.appendChild(optgroup);
+  assert_equals(target.selectedOptions[0].textContent, 'Second');
+}, 'The last selected OPTION should win; Inserted by DOM API');
+
+test(() => {
+  const target = document.querySelector("#by-innerHTML");
+  target.innerHTML = '<option selected>First</option>' +
+      '<option selected>Second</option>';
+  assert_equals(target.selectedOptions[0].textContent, 'Second');
+
+  target.innerHTML = '<option selected>First</option>' +
+      '<optgroup><option selected>Second</option>' +
+      '<option selected>Third</option></optgroup>' +
+      '<option selected>Fourth</option>';
+  assert_equals(target.selectedOptions[0].textContent, 'Fourth');
+}, 'The last selected OPTION should win; Inserted by innerHTML');
+</script>
+</body>
diff --git a/tests/wpt/web-platform-tests/interfaces/picture-in-picture.idl b/tests/wpt/web-platform-tests/interfaces/picture-in-picture.idl
index 3d3bad08219a..195977335603 100644
--- a/tests/wpt/web-platform-tests/interfaces/picture-in-picture.idl
+++ b/tests/wpt/web-platform-tests/interfaces/picture-in-picture.idl
@@ -32,11 +32,11 @@ interface PictureInPictureWindow : EventTarget {
 };
 
 [Exposed=Window]
-interface EnterPictureInPictureEvent : Event {
-    constructor(DOMString type, EnterPictureInPictureEventInit eventInitDict);
+interface PictureInPictureEvent : Event {
+    constructor(DOMString type, PictureInPictureEventInit eventInitDict);
     [SameObject] readonly attribute PictureInPictureWindow pictureInPictureWindow;
 };
 
-dictionary EnterPictureInPictureEventInit : EventInit {
+dictionary PictureInPictureEventInit : EventInit {
     required PictureInPictureWindow pictureInPictureWindow;
 };
diff --git a/tests/wpt/web-platform-tests/picture-in-picture/leave-picture-in-picture.html b/tests/wpt/web-platform-tests/picture-in-picture/leave-picture-in-picture.html
index 22445c216ef1..a0fbcb23e57e 100644
--- a/tests/wpt/web-platform-tests/picture-in-picture/leave-picture-in-picture.html
+++ b/tests/wpt/web-platform-tests/picture-in-picture/leave-picture-in-picture.html
@@ -10,9 +10,16 @@
 <body></body>
 <script>
 promise_test(async t => {
+  let pictureInPictureWindow;
   const video = await loadVideo();
 
+  video.addEventListener('enterpictureinpicture', t.step_func_done(event => {
+    pictureInPictureWindow = event.pictureInPictureWindow;
+  }));
+
   video.addEventListener('leavepictureinpicture', t.step_func_done(event => {
+    assert_equals(pictureInPictureWindow, event.pictureInPictureWindow);
+
     assert_equals(event.target, video);
     assert_equals(event.bubbles, true);
     assert_equals(event.cancelable, false);
@@ -25,9 +32,15 @@
 }, 'leavepictureinpicture event is fired if document.exitPictureInPicture');
 
 promise_test(async t => {
+  let pictureInPictureWindow;
   const video = await loadVideo();
 
+  video.addEventListener('enterpictureinpicture', t.step_func_done(event => {
+    pictureInPictureWindow = event.pictureInPictureWindow;
+  }));
+
   video.addEventListener('leavepictureinpicture', t.step_func_done(event => {
+    assert_equals(pictureInPictureWindow, event.pictureInPictureWindow);
     assert_equals(event.target, video);
     assert_equals(event.bubbles, true);
     assert_equals(event.cancelable, false);
diff --git a/tests/wpt/web-platform-tests/scroll-animations/css/scroll-timeline-cssom.tentative.html b/tests/wpt/web-platform-tests/scroll-animations/css/scroll-timeline-cssom.tentative.html
new file mode 100644
index 000000000000..36fcbf704bd9
--- /dev/null
+++ b/tests/wpt/web-platform-tests/scroll-animations/css/scroll-timeline-cssom.tentative.html
@@ -0,0 +1,184 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+<div id="target"></div>
+<script>
+
+// Runs a function while a stylesheet is temporarily inserted into the
+// document.
+function with_stylesheet(text, func) {
+  let s = document.createElement('style');
+  try {
+    s.textContent = text;
+    document.documentElement.append(s);
+    func(s.sheet.rules);
+  } finally {
+    s.remove();
+  }
+}
+
+// Runs a test while a stylesheet is temporarily inserted into the
+// document.
+function test_stylesheet(text, func, description) {
+  test(() => {
+    with_stylesheet(text, func);
+  }, description);
+}
+
+function test_valid_rule(text, description) {
+  test_stylesheet(text, (rules) => {
+    assert_equals(rules.length, 1);
+    assert_equals(rules[0].constructor.name, 'CSSScrollTimelineRule');
+  }, description);
+}
+
+function test_invalid_rule(text, description) {
+  test_stylesheet(text, (rules) => {
+    assert_equals(rules.length, 0);
+  }, description);
+}
+
+// Verify that for the _specifed_ value for a given _descriptor_, the _expected_
+// string can be observed via the equivalent attribute on CSSScrollTimelineRule.
+function test_descriptor(descriptor, specified, expected) {
+  if (typeof(expected) == 'undefined')
+    expected = specified;
+  let attribute = descriptor.replaceAll(/\-./g, x => x[1].toUpperCase());
+  test_stylesheet(`@scroll-timeline test { ${descriptor}:${specified}; }`, (rules) => {
+    assert_equals(rules.length, 1);
+    assert_equals(rules[0].constructor.name, 'CSSScrollTimelineRule');
+    assert_equals(rules[0][attribute], expected);
+  }, `CSSScrollTimelineRule.${attribute} ${specified}`);
+}
+
+test_valid_rule('@scroll-timeline foo {}', 'Empty block');
+test_valid_rule('@scroll-timeline foo {', 'EOF ends block');
+test_valid_rule('@scroll-timeline "foo" {}', 'Timeline name can be a <string>');
+
+test_invalid_rule('@scroll-timeline', 'Missing prelude');
+test_invalid_rule('@scroll-timeline foo', 'Missing block');
+test_invalid_rule('@scroll-timeline {}', 'Missing timeline name');
+test_invalid_rule('@scroll-timeline 123 {}', 'Timeline name must be an identifier');
+test_invalid_rule('@scroll-timeline none {}', 'Timeline name must match <custom-ident>');
+test_invalid_rule('@scroll-timeline NONE {}', 'Timeline name must match <custom-ident> (caps)');
+test_invalid_rule('@scroll-timeline NoNe {}', 'Timeline name must match <custom-ident> (mixed)');
+test_invalid_rule('@scroll-timeline initial {}', 'Timeline name may not be initial');
+test_invalid_rule('@scroll-timeline inherit {}', 'Timeline name may not be inherit');
+test_invalid_rule('@scroll-timeline unset {}', 'Timeline name may not be unset');
+test_invalid_rule('@scroll-timeline revert {}', 'Timeline name may not be revert');
+test_invalid_rule('@scroll-timeline default {}', 'Timeline name may not be default');
+test_invalid_rule('@scroll-timeline foo bar {}', 'Extra timeline name');
+
+// CSSRule.type
+
+test(() => {
+  with_stylesheet(`@scroll-timeline valid { }`, (rules) => {
+    assert_equals(rules.length, 1);
+    let rule = rules[0];
+    assert_equals(rule.constructor.name, 'CSSScrollTimelineRule');
+    assert_equals(rule.type, 0);
+  });
+}, 'CSSRule.type returns 0');
+
+// CSSScrollTimelineRule.name
+
+function test_name(specified, expected) {
+  if (typeof(expected) == 'undefined')
+    expected = specified;
+  test_stylesheet(`@scroll-timeline ${specified} { }`, (rules) => {
+    assert_equals(rules.length, 1);
+    assert_equals(rules[0].constructor.name, 'CSSScrollTimelineRule');
+    assert_equals(rules[0].name, expected);
+  }, `CSSScrollTimelineRule.name ${specified}`);
+}
+
+test_name('foo');
+test_name('Foo');
+test_name('f___123');
+test_name('a\\9 b', 'a\tb'); // U+0009 CHARACTER TABULATION
+test_name('"foo"', 'foo');
+test_name('"none"', 'none');
+
+// CSSScrollTimelineRule.source
+
+function test_source(specified, expected) {
+  test_descriptor('source', specified, expected);
+}
+
+test_source('selector(#foo)');
+test_source('selector( #foo )', 'selector(#foo)');
+test_source(' selector(#foo) ', 'selector(#foo)');
+test_source('none');
+test_source(' none ', 'none');
+test_source('selector(#a\\9 b)');
+
+test_source('#foo', 'none');
+test_source('', 'none');
+test_source('element(#foo)', 'none');
+test_source('selector(#foo more)', 'none');
+test_source('selector(html)', 'none');
+test_source('selector(foo)', 'none');
+test_source('selector(:before)', 'none');
+test_source('selector(*)', 'none');
+test_source('selector(.a)', 'none');
+test_source('selector(.a, .b)', 'none');
+
+// CSSScrollTimelineRule.orientation
+
+function test_orientation(specified, expected) {
+  test_descriptor('orientation', specified, expected);
+}
+
+test_orientation('auto');
+test_orientation('block');
+test_orientation('inline');
+test_orientation('horizontal');
+test_orientation('vertical');
+test_orientation('  vertical  ', 'vertical');
+
+test_orientation('', 'auto');
+test_orientation('foo', 'auto');
+test_orientation('10px', 'auto');
+test_orientation('red', 'auto');
+
+// CSSScrollTimelineRule.start
+// CSSScrollTimelineRule.end
+
+function test_offsets(specified, expected) {
+  test_descriptor('start', specified, expected);
+  test_descriptor('end', specified, expected);
+}
+
+test_offsets('auto');
+test_offsets(' auto ', 'auto');
+test_offsets('10px',);
+test_offsets(' 10px ', '10px');
+test_offsets('10em');
+test_offsets('10%');
+test_offsets('calc(1px + 1%)');
+
+test_offsets('', 'auto');
+test_offsets('red', 'auto');
+test_offsets('#fff', 'auto');
+test_offsets('unset', 'auto');
+test_offsets('selector(#foo)', 'auto');
+
+// CSSScrollTimelineRule.timeRange
+
+function test_scroll_time_range(specified, expected) {
+  test_descriptor('time-range', specified, expected);
+}
+
+test_scroll_time_range('auto');
+test_scroll_time_range(' auto ', 'auto');
+test_scroll_time_range('1s');
+test_scroll_time_range(' 1s ', '1s');
+test_scroll_time_range('1000ms');
+
+test_scroll_time_range('', 'auto');
+test_scroll_time_range('red', 'auto');
+test_scroll_time_range('#fff', 'auto');
+test_scroll_time_range('unset', 'auto');
+
+</script>
diff --git a/tests/wpt/web-platform-tests/tools/wpt/requirements.txt b/tests/wpt/web-platform-tests/tools/wpt/requirements.txt
index 3baefa50ea98..90d0cb6cdc87 100644
--- a/tests/wpt/web-platform-tests/tools/wpt/requirements.txt
+++ b/tests/wpt/web-platform-tests/tools/wpt/requirements.txt
@@ -1,2 +1,2 @@
-requests==2.23.0
+requests==2.24.0
 mozinfo==1.2.1  # https://bugzilla.mozilla.org/show_bug.cgi?id=1621226
diff --git a/tests/wpt/web-platform-tests/tools/wptrunner/requirements.txt b/tests/wpt/web-platform-tests/tools/wptrunner/requirements.txt
index 5310721bbb90..d1d733b86b21 100644
--- a/tests/wpt/web-platform-tests/tools/wptrunner/requirements.txt
+++ b/tests/wpt/web-platform-tests/tools/wptrunner/requirements.txt
@@ -5,5 +5,5 @@ mozdebug==0.2
 # Pillow 7 requires Python 3
 pillow==6.2.2  # pyup: <7.0
 urllib3[secure]==1.25.9
-requests==2.23.0
+requests==2.24.0
 six==1.15.0
diff --git a/tests/wpt/web-platform-tests/tools/wptrunner/requirements_sauce.txt b/tests/wpt/web-platform-tests/tools/wptrunner/requirements_sauce.txt
index e9e97647796e..5f70629d81b7 100644
--- a/tests/wpt/web-platform-tests/tools/wptrunner/requirements_sauce.txt
+++ b/tests/wpt/web-platform-tests/tools/wptrunner/requirements_sauce.txt
@@ -1,3 +1,3 @@
 mozprocess==1.0.0
 selenium==3.141.0
-requests==2.23.0
+requests==2.24.0
diff --git a/tests/wpt/web-platform-tests/webrtc/RTCRtpSender-replaceTrack.https.html b/tests/wpt/web-platform-tests/webrtc/RTCRtpSender-replaceTrack.https.html
index 77b0fc9594c2..a370b6c059a5 100644
--- a/tests/wpt/web-platform-tests/webrtc/RTCRtpSender-replaceTrack.https.html
+++ b/tests/wpt/web-platform-tests/webrtc/RTCRtpSender-replaceTrack.https.html
@@ -1,5 +1,6 @@
 <!doctype html>
 <meta charset=utf-8>
+<meta name="timeout" content="long">
 <title>RTCRtpSender.prototype.replaceTrack</title>
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
diff --git a/tests/wpt/web-platform-tests/webrtc/RTCRtpTransceiver.https.html b/tests/wpt/web-platform-tests/webrtc/RTCRtpTransceiver.https.html
index 9767417bf376..487774982298 100644
--- a/tests/wpt/web-platform-tests/webrtc/RTCRtpTransceiver.https.html
+++ b/tests/wpt/web-platform-tests/webrtc/RTCRtpTransceiver.https.html
@@ -400,8 +400,9 @@
     const offer = await pc1.createOffer();
     await pc1.setLocalDescription(offer);
     // Remove track-id from msid
-    offer.sdp = offer.sdp.replace(/(a=msid:[^ \t]+).*\r\n/g, "$1\r\n");
-    assert_true(offer.sdp.includes(`a=msid:${stream.id}\r\n`));
+    // Fixate stream-id so that error message is consistent.
+    offer.sdp = offer.sdp.replace(/(a=msid:[^ \t]+).*\r\n/g,
+                                  "a=msid:fake-stream-id\r\n");
     await pc2.setRemoteDescription(offer);
     const answer = await pc2.createAnswer();
     await pc1.setRemoteDescription(answer);
@@ -1146,10 +1147,16 @@
 
     let gotUnmuteAudio2 = gotUnmuteEvent(pc2.getTransceivers()[0].receiver.track);
     let gotUnmuteVideo2 = gotUnmuteEvent(pc2.getTransceivers()[1].receiver.track);
+    // Jump out before waiting if a track is unmuted before RTP starts flowing.
+    assert_true(pc1.getTransceivers()[0].receiver.track.muted);
+    assert_true(pc1.getTransceivers()[1].receiver.track.muted);
+    assert_true(pc2.getTransceivers()[0].receiver.track.muted);
+    assert_true(pc2.getTransceivers()[1].receiver.track.muted);
 
     await iceConnected(pc1);
     await iceConnected(pc2);
 
+
     // Check that receive tracks are unmuted when RTP starts flowing
     await gotUnmuteAudio1;
     await gotUnmuteVideo1;
diff --git a/tests/wpt/web-platform-tests/webrtc/simulcast/simulcast.js b/tests/wpt/web-platform-tests/webrtc/simulcast/simulcast.js
index af804c03e865..018ebf63abf7 100644
--- a/tests/wpt/web-platform-tests/webrtc/simulcast/simulcast.js
+++ b/tests/wpt/web-platform-tests/webrtc/simulcast/simulcast.js
@@ -98,7 +98,7 @@ async function negotiateSimulcastAndWaitForVideo(t, rids, pc1, pc2, codec) {
   t.add_cleanup(() => stream.getTracks().forEach(track => track.stop()));
   const transceiver = pc1.addTransceiver(stream.getVideoTracks()[0], {
     streams: [stream],
-    sendEncodings: rids.map(rid => {rid}),
+    sendEncodings: rids.map(rid => ({rid})),
   });
   if (codec) {
     preferCodec(transceiver, codec.mimeType, codec.sdpFmtpLine);
diff --git a/tests/wpt/web-platform-tests/window-segments/getWindowSegments-iframes.tentative.sub.html b/tests/wpt/web-platform-tests/window-segments/getWindowSegments-iframes.tentative.sub.html
new file mode 100644
index 000000000000..188a1180c024
--- /dev/null
+++ b/tests/wpt/web-platform-tests/window-segments/getWindowSegments-iframes.tentative.sub.html
@@ -0,0 +1,39 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Window Segments: getWindowSegments() tentative</title>
+<!-- TODO: update link to W3C whenever specifications are ready -->
+<link rel="help" href="https://github.com/webscreens/window-segments/"/>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style>
+iframe { zoom: 2; }
+</style>
+<script>
+"use strict";
+
+async_test((t) => {
+  let segments = window.getWindowSegments();
+  let responses = 0;
+  window.addEventListener("message", t.step_func((evt) => {
+    let desc = "Window segments of child frame for: " + evt.data.domain;
+    assert_equals(evt.data.length, segments.length,
+        desc + " must match in length.");
+    assert_equals(evt.data.x, segments[0].x, desc + " must match for x.");
+    assert_equals(evt.data.y, segments[0].y, desc + " must match for x.");
+    assert_equals(evt.data.width, segments[0].width,
+        desc + " must match for x.");
+    assert_equals(evt.data.height, segments[0].height,
+        desc + " must match for x.");
+
+    responses++;
+    if (responses == 2) {
+      t.done();
+    }
+  }));
+}, "Window segments of child frames (same or different domain) must match those of the main frame.");
+</script>
+
+
+<iframe src="http://{{domains[www1]}}:{{ports[http][0]}}/window-segments/post-window-segments-sub-frame.html"></iframe>
+<iframe src="post-window-segments-sub-frame.html"></iframe>
+
diff --git a/tests/wpt/web-platform-tests/window-segments/getWindowSegments.https.tentative.html b/tests/wpt/web-platform-tests/window-segments/getWindowSegments.https.tentative.html
new file mode 100644
index 000000000000..e3821bda40d3
--- /dev/null
+++ b/tests/wpt/web-platform-tests/window-segments/getWindowSegments.https.tentative.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Window Segments: getWindowSegments() tentative</title>
+<!-- TODO: update link to W3C whenever specifications are ready -->
+<link rel="help" href="https://github.com/webscreens/window-segments/"/>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+"use strict";
+
+test(() => {
+  let segments = window.getWindowSegments();
+  assert_equals(segments.length, 1, "For a viewport not segmented, there must be a single window segment");
+  let segment = segments[0];
+  assert_equals(segment.x, 0, "A viewport with a single segment must have 0, 0 origin");
+  assert_equals(segment.y, 0, "A viewport with a single segment must have 0, 0 origin");
+  assert_equals(segment.width, window.innerWidth, "A viewport with a single segment must have a width in CSS pixels, matching window.innerWidth");
+  assert_equals(segment.height, window.innerHeight, "A viewport with a single segment must have a height in CSS pixels, matching window.innerHeight");
+}, "getWindowSegments() returns a single segment, equal to the layout viewport dimesions");
+</script>
+
diff --git a/tests/wpt/web-platform-tests/window-segments/post-window-segments-sub-frame.html b/tests/wpt/web-platform-tests/window-segments/post-window-segments-sub-frame.html
new file mode 100644
index 000000000000..f4d1b405305f
--- /dev/null
+++ b/tests/wpt/web-platform-tests/window-segments/post-window-segments-sub-frame.html
@@ -0,0 +1,12 @@
+<script>
+let segments = getWindowSegments();
+
+parent.postMessage({
+    length: segments.length,
+    x: segments[0].x,
+    y: segments[0].y,
+    width: segments[0].width,
+    height: segments[0].height,
+    domain: document.domain,
+  }, "*");
+</script>