From 35b828da755fdf714a082834917ae584d1942efa Mon Sep 17 00:00:00 2001
From: WPT Sync Bot <josh+wptsync@joshmatthews.net>
Date: Sun, 16 Jun 2019 10:25:29 +0000
Subject: [PATCH] Update web-platform-tests to revision
 4100d1d51b885185c50902397f7d203d89efc24c

---
 .../FileAPI/url/url-with-fetch.any.js.ini     |   3 +
 tests/wpt/metadata/MANIFEST.json              | 340 +++++++++++++++---
 .../text-underline-offset-001.html.ini        |   2 +
 .../matchMedia-display-none-iframe.html.ini   |   2 -
 .../backdrop-filter-plus-filter.html.ini      |   2 +
 .../fetch/content-type/response.window.js.ini |  18 +-
 .../fetch/content-type/script.window.js.ini   |  13 +-
 .../nosniff/parsing-nosniff.window.js.ini     |   6 +
 ...ml.ini => traverse_the_history_4.html.ini} |   2 +-
 ...s-negative-innerwidth-innerheight.html.ini |  19 +
 ...features-negative-screenx-screeny.html.ini |  19 +
 .../open-features-negative-top-left.html.ini  |  19 +
 ...en-features-negative-width-height.html.ini |  19 +
 .../open-features-non-integer-height.html.ini |  34 +-
 ...-features-non-integer-innerheight.html.ini |  28 +-
 ...n-features-non-integer-innerwidth.html.ini |  28 +-
 .../open-features-non-integer-left.html.ini   |  28 +-
 ...open-features-non-integer-screenx.html.ini |  28 +-
 ...open-features-non-integer-screeny.html.ini |  28 +-
 .../open-features-non-integer-width.html.ini  |  34 +-
 .../tests/set_window_rect/set.py.ini          |   3 +
 .../Worker/Worker-constructor.html.ini        |   2 -
 .../css/transition_calc_implicit.html.ini     |   2 -
 .../web-platform-tests/.azure-pipelines.yml   |  38 +-
 ...g-grid-container-containing-block-001.html |   1 +
 ...positioning-grid-container-parent-001.html |   1 +
 ...positioned-children-writing-modes-001.html |   1 +
 .../grid-positioned-items-background-001.html |   1 +
 ...d-positioned-items-background-rtl-001.html |   1 +
 ...id-positioned-items-implicit-grid-001.html |   1 +
 ...sitioned-items-implicit-grid-line-001.html |   1 +
 ...ned-items-unknown-named-grid-line-001.html |   1 +
 .../grid-sizing-positioned-items-001.html     |   1 +
 ...should-not-create-implicit-tracks-001.html |   1 +
 ...id-items-should-not-take-up-space-001.html |   1 +
 .../css-overflow/overfow-outside-padding.html |  69 ++++
 .../text-underline-offset-001-notref.html     |  32 ++
 .../text-underline-offset-002-ref.html        |  33 ++
 .../text-underline-offset-001.html            |  40 +++
 .../text-underline-offset-002.html            |  43 +++
 ...tComputedStyle-width-scroll.tentative.html |  26 ++
 .../backdrop-filter-edge-clipping.html        |  62 ++++
 .../backdrop-filter-plus-filter-ref.html      |  49 +++
 .../backdrop-filter-plus-filter.html          |  45 +++
 .../track-webvtt-non-snap-to-lines-ref.html   |   8 +-
 .../track-webvtt-non-snap-to-lines.html       |   2 +-
 ...tt-two-cue-layout-after-first-end-ref.html |   8 +-
 ...webvtt-two-cue-layout-after-first-end.html |  24 +-
 .../interfaces/geometry.idl                   |   1 +
 .../web-platform-tests/interfaces/web-nfc.idl |   2 +-
 .../web-platform-tests/interfaces/webrtc.idl  |   2 +-
 .../web-platform-tests/interfaces/webxr.idl   |  24 +-
 .../root-margin-root-element.html             |  90 +++++
 .../direction/direction-overall-ref.html      |  51 +++
 .../direction/direction-overall.html          |  61 ++++
 .../direction/direction-token-ref.html        |  20 ++
 .../direction/direction-token.html            |  23 ++
 .../direction/direction.html                  |  38 ++
 .../media-source/mediasource-play.html        |   1 +
 ...aStream-MediaElement-firstframe.https.html |   7 +-
 ...iaStream-MediaElement-srcObject.https.html | 255 +++++++++++--
 .../mediasession/setactionhandler.html        |   1 +
 .../fetch-event-async-respond-with.https.html |   6 +-
 .../change-sync-for-nested-use-ref.html       |  16 +
 .../reftests/change-sync-for-nested-use.html  |  30 ++
 .../wpt/web-platform-tests/tools/lint/lint.py |  10 +-
 .../web-platform-tests/tools/lint/rules.py    |   5 +
 .../tools/lint/tests/test_path_lints.py       |  14 +-
 .../tools/wptrunner/setup.py                  |   1 -
 .../Element-insertAdjacentText.tentative.html |  37 ++
 ...sertion-into-script-element.tentative.html |  67 ++++
 .../NFCErrorEvent_constructor.https.html      |   9 +
 .../NFCReadingEvent_constructor.https.html    |  23 ++
 .../web-nfc/NFCWriter_push.https.html         |  13 -
 .../web-nfc/idlharness.https.window.js        |   2 +-
 .../webrtc/idlharness.https.window.js         |   2 +-
 ...es_overlapping_completely_move_up-ref.html |  24 +-
 ...ues_overlapping_partially_move_up-ref.html |  28 +-
 .../align_center_position_gt_50-ref.html      |   4 +-
 .../align_center_position_lt_50-ref.html      |   4 +-
 ...sition_lt_50_size_gt_maximum_size-ref.html |   4 +-
 .../align_center_wrapped-ref.html             |   2 +-
 .../align_end_wrapped-ref.html                |   2 +-
 .../align_start_wrapped-ref.html              |   2 +-
 .../bidi/start_alignment-ref.html             |  41 +++
 .../bidi/start_alignment.html                 |  19 +
 .../navigate_cue_position-1.html              |   2 +-
 .../navigate_cue_position-ref-1.html          |   4 +-
 .../2_cues_overlapping_completely_move_up.vtt |   4 +-
 .../2_cues_overlapping_partially_move_up.vtt  |   4 +-
 .../support/start_alignment.vtt               |   5 +
 91 files changed, 1837 insertions(+), 292 deletions(-)
 create mode 100644 tests/wpt/metadata/css/css-text-decor/text-underline-offset-001.html.ini
 delete mode 100644 tests/wpt/metadata/css/cssom-view/matchMedia-display-none-iframe.html.ini
 create mode 100644 tests/wpt/metadata/css/filter-effects/backdrop-filter-plus-filter.html.ini
 rename tests/wpt/metadata/html/browsers/history/the-history-interface/{traverse_the_history_5.html.ini => traverse_the_history_4.html.ini} (71%)
 delete mode 100644 tests/wpt/metadata/workers/constructors/Worker/Worker-constructor.html.ini
 delete mode 100644 tests/wpt/mozilla/meta/css/transition_calc_implicit.html.ini
 create mode 100644 tests/wpt/web-platform-tests/css/css-overflow/overfow-outside-padding.html
 create mode 100644 tests/wpt/web-platform-tests/css/css-text-decor/reference/text-underline-offset-001-notref.html
 create mode 100644 tests/wpt/web-platform-tests/css/css-text-decor/reference/text-underline-offset-002-ref.html
 create mode 100644 tests/wpt/web-platform-tests/css/css-text-decor/text-underline-offset-001.html
 create mode 100644 tests/wpt/web-platform-tests/css/css-text-decor/text-underline-offset-002.html
 create mode 100644 tests/wpt/web-platform-tests/css/cssom/getComputedStyle-width-scroll.tentative.html
 create mode 100644 tests/wpt/web-platform-tests/css/filter-effects/backdrop-filter-edge-clipping.html
 create mode 100644 tests/wpt/web-platform-tests/css/filter-effects/backdrop-filter-plus-filter-ref.html
 create mode 100644 tests/wpt/web-platform-tests/css/filter-effects/backdrop-filter-plus-filter.html
 create mode 100644 tests/wpt/web-platform-tests/intersection-observer/root-margin-root-element.html
 create mode 100644 tests/wpt/web-platform-tests/mathml/presentation-markup/direction/direction-overall-ref.html
 create mode 100644 tests/wpt/web-platform-tests/mathml/presentation-markup/direction/direction-overall.html
 create mode 100644 tests/wpt/web-platform-tests/mathml/presentation-markup/direction/direction-token-ref.html
 create mode 100644 tests/wpt/web-platform-tests/mathml/presentation-markup/direction/direction-token.html
 create mode 100644 tests/wpt/web-platform-tests/mathml/presentation-markup/direction/direction.html
 create mode 100644 tests/wpt/web-platform-tests/svg/render/reftests/change-sync-for-nested-use-ref.html
 create mode 100644 tests/wpt/web-platform-tests/svg/render/reftests/change-sync-for-nested-use.html
 create mode 100644 tests/wpt/web-platform-tests/trusted-types/Element-insertAdjacentText.tentative.html
 create mode 100644 tests/wpt/web-platform-tests/trusted-types/block-text-node-insertion-into-script-element.tentative.html
 create mode 100644 tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/bidi/start_alignment-ref.html
 create mode 100644 tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/bidi/start_alignment.html
 create mode 100644 tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/support/start_alignment.vtt

diff --git a/tests/wpt/metadata/FileAPI/url/url-with-fetch.any.js.ini b/tests/wpt/metadata/FileAPI/url/url-with-fetch.any.js.ini
index 947e223fb28f..3b874fc17488 100644
--- a/tests/wpt/metadata/FileAPI/url/url-with-fetch.any.js.ini
+++ b/tests/wpt/metadata/FileAPI/url/url-with-fetch.any.js.ini
@@ -34,3 +34,6 @@
   [Revoke blob URL after creating Request, will fetch]
     expected: FAIL
 
+  [Revoke blob URL after calling fetch, fetch should succeed]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/MANIFEST.json b/tests/wpt/metadata/MANIFEST.json
index b61081ad02dc..a8f266ecbb8b 100644
--- a/tests/wpt/metadata/MANIFEST.json
+++ b/tests/wpt/metadata/MANIFEST.json
@@ -141767,6 +141767,30 @@
      {}
     ]
    ],
+   "css/css-text-decor/text-underline-offset-001.html": [
+    [
+     "css/css-text-decor/text-underline-offset-001.html",
+     [
+      [
+       "/css/css-text-decor/reference/text-underline-offset-001-notref.html",
+       "!="
+      ]
+     ],
+     {}
+    ]
+   ],
+   "css/css-text-decor/text-underline-offset-002.html": [
+    [
+     "css/css-text-decor/text-underline-offset-002.html",
+     [
+      [
+       "/css/css-text-decor/reference/text-underline-offset-002-ref.html",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
    "css/css-text/boundary-shaping/boundary-shaping-001.html": [
     [
      "css/css-text/boundary-shaping/boundary-shaping-001.html",
@@ -176977,6 +177001,18 @@
      {}
     ]
    ],
+   "css/filter-effects/backdrop-filter-edge-clipping.html": [
+    [
+     "css/filter-effects/backdrop-filter-edge-clipping.html",
+     [
+      [
+       "/css/filter-effects/backdrop-filter-paint-order-ref.html",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
    "css/filter-effects/backdrop-filter-edge-pixels.html": [
     [
      "css/filter-effects/backdrop-filter-edge-pixels.html",
@@ -177049,6 +177085,18 @@
      {}
     ]
    ],
+   "css/filter-effects/backdrop-filter-plus-filter.html": [
+    [
+     "css/filter-effects/backdrop-filter-plus-filter.html",
+     [
+      [
+       "/css/filter-effects/backdrop-filter-plus-filter-ref.html",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
    "css/filter-effects/backdrop-filter-reference-filter.html": [
     [
      "css/filter-effects/backdrop-filter-reference-filter.html",
@@ -201125,6 +201173,30 @@
      {}
     ]
    ],
+   "mathml/presentation-markup/direction/direction-overall.html": [
+    [
+     "mathml/presentation-markup/direction/direction-overall.html",
+     [
+      [
+       "/mathml/presentation-markup/direction/direction-overall-ref.html",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
+   "mathml/presentation-markup/direction/direction-token.html": [
+    [
+     "mathml/presentation-markup/direction/direction-token.html",
+     [
+      [
+       "/mathml/presentation-markup/direction/direction-token-ref.html",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
    "mathml/presentation-markup/fractions/frac-bar-001.html": [
     [
      "mathml/presentation-markup/fractions/frac-bar-001.html",
@@ -202805,6 +202877,18 @@
      {}
     ]
    ],
+   "svg/render/reftests/change-sync-for-nested-use.html": [
+    [
+     "svg/render/reftests/change-sync-for-nested-use.html",
+     [
+      [
+       "/svg/render/reftests/change-sync-for-nested-use-ref.html",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
    "svg/render/reftests/filter-effects-on-pattern.html": [
     [
      "svg/render/reftests/filter-effects-on-pattern.html",
@@ -203705,6 +203789,18 @@
      {}
     ]
    ],
+   "webvtt/rendering/cues-with-video/processing-model/bidi/start_alignment.html": [
+    [
+     "webvtt/rendering/cues-with-video/processing-model/bidi/start_alignment.html",
+     [
+      [
+       "/webvtt/rendering/cues-with-video/processing-model/bidi/start_alignment-ref.html",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
    "webvtt/rendering/cues-with-video/processing-model/bidi/u002E_LF_u05D0.html": [
     [
      "webvtt/rendering/cues-with-video/processing-model/bidi/u002E_LF_u05D0.html",
@@ -250843,6 +250939,12 @@
    "css/css-text-decor/reference/text-emphasis-style-string-001-ref.xht": [
     []
    ],
+   "css/css-text-decor/reference/text-underline-offset-001-notref.html": [
+    []
+   ],
+   "css/css-text-decor/reference/text-underline-offset-002-ref.html": [
+    []
+   ],
    "css/css-text/META.yml": [
     []
    ],
@@ -256672,6 +256774,9 @@
    "css/filter-effects/backdrop-filter-paint-order-ref.html": [
     []
    ],
+   "css/filter-effects/backdrop-filter-plus-filter-ref.html": [
+    []
+   ],
    "css/filter-effects/backdrop-filter-update-ref.html": [
     []
    ],
@@ -270598,6 +270703,12 @@
    "mathml/README.md": [
     []
    ],
+   "mathml/presentation-markup/direction/direction-overall-ref.html": [
+    []
+   ],
+   "mathml/presentation-markup/direction/direction-token-ref.html": [
+    []
+   ],
    "mathml/presentation-markup/fractions/frac-bar-001-ref.html": [
     []
    ],
@@ -277804,6 +277915,9 @@
    "svg/render/reftests/blending-svg-root-ref.html": [
     []
    ],
+   "svg/render/reftests/change-sync-for-nested-use-ref.html": [
+    []
+   ],
    "svg/render/reftests/filter-effects-on-pattern-ref.html": [
     []
    ],
@@ -284044,6 +284158,9 @@
    "webvtt/rendering/cues-with-video/processing-model/bidi/bidi_ruby-ref.html": [
     []
    ],
+   "webvtt/rendering/cues-with-video/processing-model/bidi/start_alignment-ref.html": [
+    []
+   ],
    "webvtt/rendering/cues-with-video/processing-model/bidi/u002E_LF_u05D0-ref.html": [
     []
    ],
@@ -284878,6 +284995,9 @@
    "webvtt/rendering/cues-with-video/processing-model/support/size_50.vtt": [
     []
    ],
+   "webvtt/rendering/cues-with-video/processing-model/support/start_alignment.vtt": [
+    []
+   ],
    "webvtt/rendering/cues-with-video/processing-model/support/test.vtt": [
     []
    ],
@@ -312312,6 +312432,12 @@
      {}
     ]
    ],
+   "css/css-overflow/overfow-outside-padding.html": [
+    [
+     "css/css-overflow/overfow-outside-padding.html",
+     {}
+    ]
+   ],
    "css/css-overflow/parsing/block-ellipsis-invalid.html": [
     [
      "css/css-overflow/parsing/block-ellipsis-invalid.html",
@@ -321670,6 +321796,12 @@
      {}
     ]
    ],
+   "css/cssom/getComputedStyle-width-scroll.tentative.html": [
+    [
+     "css/cssom/getComputedStyle-width-scroll.tentative.html",
+     {}
+    ]
+   ],
    "css/cssom/historical.html": [
     [
      "css/cssom/historical.html",
@@ -355971,6 +356103,12 @@
      {}
     ]
    ],
+   "intersection-observer/root-margin-root-element.html": [
+    [
+     "intersection-observer/root-margin-root-element.html",
+     {}
+    ]
+   ],
    "intersection-observer/root-margin-rounding.html": [
     [
      "intersection-observer/root-margin-rounding.html",
@@ -356625,6 +356763,12 @@
      }
     ]
    ],
+   "mathml/presentation-markup/direction/direction.html": [
+    [
+     "mathml/presentation-markup/direction/direction.html",
+     {}
+    ]
+   ],
    "mathml/presentation-markup/fractions/frac-1.html": [
     [
      "mathml/presentation-markup/fractions/frac-1.html",
@@ -357198,7 +357342,9 @@
    "media-source/mediasource-play.html": [
     [
      "media-source/mediasource-play.html",
-     {}
+     {
+      "timeout": "long"
+     }
     ]
    ],
    "media-source/mediasource-preload.html": [
@@ -393910,6 +394056,12 @@
      {}
     ]
    ],
+   "trusted-types/Element-insertAdjacentText.tentative.html": [
+    [
+     "trusted-types/Element-insertAdjacentText.tentative.html",
+     {}
+    ]
+   ],
    "trusted-types/Element-outerHTML.tentative.html": [
     [
      "trusted-types/Element-outerHTML.tentative.html",
@@ -394150,6 +394302,12 @@
      {}
     ]
    ],
+   "trusted-types/block-text-node-insertion-into-script-element.tentative.html": [
+    [
+     "trusted-types/block-text-node-insertion-into-script-element.tentative.html",
+     {}
+    ]
+   ],
    "trusted-types/idlharness.window.js": [
     [
      "trusted-types/idlharness.window.html",
@@ -432133,7 +432291,7 @@
  },
  "paths": {
   ".azure-pipelines.yml": [
-   "1a8950b870fbad7bb343889c9cf5f091bb56a3fa",
+   "80748691d6fd3c16a659c4c6c57115ca9341a38e",
    "support"
   ],
   ".codecov.yml": [
@@ -547105,11 +547263,11 @@
    "testharness"
   ],
   "css/css-grid/abspos/absolute-positioning-grid-container-containing-block-001.html": [
-   "e456af8ce0a30b430ab2696c892c6fde8884007c",
+   "4be43ddba2dec27a1dd2d1af95402e5158c7c9e6",
    "testharness"
   ],
   "css/css-grid/abspos/absolute-positioning-grid-container-parent-001.html": [
-   "a7a38ad0a0ab8c8fa13b7fac0a75268e1a026cbb",
+   "7025ccf55e9d70e5fa3db5159cd975e061003837",
    "testharness"
   ],
   "css/css-grid/abspos/descendant-static-position-001-ref.html": [
@@ -547161,7 +547319,7 @@
    "support"
   ],
   "css/css-grid/abspos/grid-positioned-children-writing-modes-001.html": [
-   "eb855279ca8b2be674180dd5240ed3860663ae45",
+   "d63b1894927bf12cec6b918b100d62ff8a7ed103",
    "reftest"
   ],
   "css/css-grid/abspos/grid-positioned-item-dynamic-change-001.html": [
@@ -547201,7 +547359,7 @@
    "support"
   ],
   "css/css-grid/abspos/grid-positioned-items-background-001.html": [
-   "19ee662e04e12e77ac0eec52b8da951ef1f27b5c",
+   "54146bce2581db8749ea75622edfdcd148d266bb",
    "reftest"
   ],
   "css/css-grid/abspos/grid-positioned-items-background-rtl-001-ref.html": [
@@ -547209,7 +547367,7 @@
    "support"
   ],
   "css/css-grid/abspos/grid-positioned-items-background-rtl-001.html": [
-   "9ed046b421533c12cf905dd175c682458279e10a",
+   "97ec1052f4be3ce0b26491c60d3c02184328dd12",
    "reftest"
   ],
   "css/css-grid/abspos/grid-positioned-items-content-alignment-001.html": [
@@ -547237,11 +547395,11 @@
    "testharness"
   ],
   "css/css-grid/abspos/grid-positioned-items-implicit-grid-001.html": [
-   "71f096aa74b9d9e012b115a21825843aa0d41e79",
+   "4b1a3d0f342f84b3a901513ce99bfcc96b635511",
    "testharness"
   ],
   "css/css-grid/abspos/grid-positioned-items-implicit-grid-line-001.html": [
-   "7b8fa4ef7bd632fcbcfae5084cb41e8424f4363f",
+   "8fc8918ee68b215da3e93fb73282ab8e0b2ef287",
    "testharness"
   ],
   "css/css-grid/abspos/grid-positioned-items-padding-001.html": [
@@ -547249,7 +547407,7 @@
    "testharness"
   ],
   "css/css-grid/abspos/grid-positioned-items-unknown-named-grid-line-001.html": [
-   "6e61f7c2de36a1d799aba0de6d10c52147d406d6",
+   "663dab45b3dbe76075c6a32a3e7b0b6a59213181",
    "testharness"
   ],
   "css/css-grid/abspos/grid-positioned-items-within-grid-implicit-track-001.html": [
@@ -547257,7 +547415,7 @@
    "testharness"
   ],
   "css/css-grid/abspos/grid-sizing-positioned-items-001.html": [
-   "0e8cd3369f7f154725f746ce4725940bec746582",
+   "e74b2b96fe62e102f4313c00bcc730bec76a667a",
    "testharness"
   ],
   "css/css-grid/abspos/orthogonal-positioned-grid-descendants-001.html": [
@@ -547629,11 +547787,11 @@
    "reftest"
   ],
   "css/css-grid/abspos/positioned-grid-items-should-not-create-implicit-tracks-001.html": [
-   "5ef006ae137c5604e9b53e322aeec60bf4841e55",
+   "adb4a7acf27514550682429e998feadb2af5676d",
    "testharness"
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    "support"
diff --git a/tests/wpt/metadata/css/css-text-decor/text-underline-offset-001.html.ini b/tests/wpt/metadata/css/css-text-decor/text-underline-offset-001.html.ini
new file mode 100644
index 000000000000..d6c9b16bea38
--- /dev/null
+++ b/tests/wpt/metadata/css/css-text-decor/text-underline-offset-001.html.ini
@@ -0,0 +1,2 @@
+[text-underline-offset-001.html]
+  expected: FAIL
diff --git a/tests/wpt/metadata/css/cssom-view/matchMedia-display-none-iframe.html.ini b/tests/wpt/metadata/css/cssom-view/matchMedia-display-none-iframe.html.ini
deleted file mode 100644
index e6e1f29e2743..000000000000
--- a/tests/wpt/metadata/css/cssom-view/matchMedia-display-none-iframe.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[matchMedia-display-none-iframe.html]
-  expected: ERROR
diff --git a/tests/wpt/metadata/css/filter-effects/backdrop-filter-plus-filter.html.ini b/tests/wpt/metadata/css/filter-effects/backdrop-filter-plus-filter.html.ini
new file mode 100644
index 000000000000..80144ff57849
--- /dev/null
+++ b/tests/wpt/metadata/css/filter-effects/backdrop-filter-plus-filter.html.ini
@@ -0,0 +1,2 @@
+[backdrop-filter-plus-filter.html]
+  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 e9c54d5e3534..76d0244413cf 100644
--- a/tests/wpt/metadata/fetch/content-type/response.window.js.ini
+++ b/tests/wpt/metadata/fetch/content-type/response.window.js.ini
@@ -249,9 +249,6 @@
   [Request: combined response Content-Type: text/html;" " text/plain]
     expected: NOTRUN
 
-  [<iframe>: separate response Content-Type: text/plain ]
-    expected: FAIL
-
   [fetch(): combined response Content-Type: text/plain */*]
     expected: NOTRUN
 
@@ -312,27 +309,24 @@
   [<iframe>: separate response Content-Type: text/plain */*;charset=gbk]
     expected: FAIL
 
-  [<iframe>: combined response Content-Type: text/html;" text/plain]
-    expected: FAIL
-
   [<iframe>: separate response Content-Type: text/html */*]
     expected: FAIL
 
-  [<iframe>: combined response Content-Type: text/html */*;charset=gbk]
+  [<iframe>: combined response Content-Type: text/html;charset=gbk text/plain text/html]
     expected: FAIL
 
-  [<iframe>: combined response Content-Type: text/html;x=" text/plain]
+  [<iframe>: combined response Content-Type: text/html */*]
     expected: FAIL
 
-  [<iframe>: combined response Content-Type: */* text/html]
+  [<iframe>: separate response Content-Type: text/plain;charset=gbk text/html]
     expected: FAIL
 
-  [<iframe>: combined response Content-Type: text/html;charset=gbk text/plain text/html]
+  [<iframe>: separate response Content-Type: text/html;charset=gbk text/plain text/html]
     expected: FAIL
 
-  [<iframe>: combined response Content-Type: text/html */*]
+  [<iframe>: separate response Content-Type: */* text/html]
     expected: FAIL
 
-  [<iframe>: combined response Content-Type: text/html;" \\" text/plain]
+  [<iframe>: separate response Content-Type: text/html;x=" text/plain]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/fetch/content-type/script.window.js.ini b/tests/wpt/metadata/fetch/content-type/script.window.js.ini
index 1cac78a466b8..13cc589c98ad 100644
--- a/tests/wpt/metadata/fetch/content-type/script.window.js.ini
+++ b/tests/wpt/metadata/fetch/content-type/script.window.js.ini
@@ -17,9 +17,6 @@
   [combined x/x;" x/y;\\" text/javascript;charset=windows-1252;" text/javascript]
     expected: FAIL
 
-  [separate text/javascript;charset=windows-1252 error text/javascript]
-    expected: FAIL
-
   [combined x/x text/javascript]
     expected: FAIL
 
@@ -38,12 +35,6 @@
   [separate x/x;charset=windows-1252 text/javascript]
     expected: FAIL
 
-  [separate text/javascript error]
-    expected: FAIL
-
-  [separate text/javascript; charset=windows-1252 text/javascript]
-    expected: FAIL
-
   [combined text/javascript;charset=windows-1252 x/x text/javascript]
     expected: FAIL
 
@@ -62,9 +53,9 @@
   [separate text/javascript;" x/x]
     expected: FAIL
 
-  [separate text/javascript ]
+  [combined text/javascript ]
     expected: FAIL
 
-  [combined text/javascript ]
+  [separate text/javascript x/x]
     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 87c807a49ff9..2557db2b806c 100644
--- a/tests/wpt/metadata/fetch/nosniff/parsing-nosniff.window.js.ini
+++ b/tests/wpt/metadata/fetch/nosniff/parsing-nosniff.window.js.ini
@@ -11,3 +11,9 @@
   [X-Content-Type-Options%3A%20nosniff%0C]
     expected: FAIL
 
+  [X-Content-Type-Options%3A%20no%0D%0AX-Content-Type-Options%3A%20nosniff]
+    expected: FAIL
+
+  [Content-Type-Options%3A%20nosniff]
+    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_4.html.ini
similarity index 71%
rename from tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini
rename to tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_4.html.ini
index dc2e45516deb..385376c7321e 100644
--- 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_4.html.ini
@@ -1,4 +1,4 @@
-[traverse_the_history_5.html]
+[traverse_the_history_4.html]
   [Multiple history traversals, last would be aborted]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-innerwidth-innerheight.html.ini b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-innerwidth-innerheight.html.ini
index bf50d59df415..e02f179ec250 100644
--- a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-innerwidth-innerheight.html.ini
+++ b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-innerwidth-innerheight.html.ini
@@ -1,5 +1,24 @@
 [open-features-negative-innerwidth-innerheight.html]
   type: testharness
+  expected: TIMEOUT
   [HTML: window.open `features`: negative values for legacy `innerwidth`, `innerheight`]
     expected: FAIL
 
+  [features "innerheight=-404.5" should NOT set "height=404"]
+    expected: TIMEOUT
+
+  [features "innerwidth=-404.5" should NOT set "width=404"]
+    expected: TIMEOUT
+
+  [features "innerwidth=-404" should NOT set "width=404"]
+    expected: TIMEOUT
+
+  [features "innerheight=-404e1" should NOT set "height=404"]
+    expected: TIMEOUT
+
+  [features "innerheight=-404" should NOT set "height=404"]
+    expected: TIMEOUT
+
+  [features "innerwidth=-404e1" should NOT set "width=404"]
+    expected: TIMEOUT
+
diff --git a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-screenx-screeny.html.ini b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-screenx-screeny.html.ini
index e150c9d848f1..23eefb8eaf96 100644
--- a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-screenx-screeny.html.ini
+++ b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-screenx-screeny.html.ini
@@ -1,5 +1,24 @@
 [open-features-negative-screenx-screeny.html]
   type: testharness
+  expected: TIMEOUT
   [HTML: window.open `features`: negative values for legacy `screenx`, `screeny`]
     expected: FAIL
 
+  [features "screenx=-204" should NOT set "left=204"]
+    expected: TIMEOUT
+
+  [features "screeny=-204" should NOT set "top=204"]
+    expected: TIMEOUT
+
+  [features "screeny=-204.5" should NOT set "top=204"]
+    expected: TIMEOUT
+
+  [features "screeny=-0" should NOT set "top=204"]
+    expected: TIMEOUT
+
+  [features "screenx=-0" should NOT set "left=204"]
+    expected: TIMEOUT
+
+  [features "screenx=-204.5" should NOT set "left=204"]
+    expected: TIMEOUT
+
diff --git a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-top-left.html.ini b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-top-left.html.ini
index ad8840fbb68b..940516ddd336 100644
--- a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-top-left.html.ini
+++ b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-top-left.html.ini
@@ -1,5 +1,24 @@
 [open-features-negative-top-left.html]
   type: testharness
+  expected: TIMEOUT
   [HTML: window.open `features`: negative values for `top`, `left`]
     expected: FAIL
 
+  [features "top=-204" should NOT set "top=204"]
+    expected: TIMEOUT
+
+  [features "top=-204.5" should NOT set "top=204"]
+    expected: TIMEOUT
+
+  [features "left=-204" should NOT set "left=204"]
+    expected: TIMEOUT
+
+  [features "top=-0" should NOT set "top=204"]
+    expected: TIMEOUT
+
+  [features "left=-204.5" should NOT set "left=204"]
+    expected: TIMEOUT
+
+  [features "left=-0" should NOT set "left=204"]
+    expected: TIMEOUT
+
diff --git a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-width-height.html.ini b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-width-height.html.ini
index d1ed9088b2b5..9027336b4532 100644
--- a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-width-height.html.ini
+++ b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-width-height.html.ini
@@ -1,5 +1,24 @@
 [open-features-negative-width-height.html]
   type: testharness
+  expected: TIMEOUT
   [HTML: window.open `features`: negative values for `width`, `height`]
     expected: FAIL
 
+  [features "height=-404" should NOT set "height=404"]
+    expected: TIMEOUT
+
+  [features "height=-404e1" should NOT set "height=404"]
+    expected: TIMEOUT
+
+  [features "height=-404.5" should NOT set "height=404"]
+    expected: TIMEOUT
+
+  [features "width=-404" should NOT set "width=404"]
+    expected: TIMEOUT
+
+  [features "width=-404e1" should NOT set "width=404"]
+    expected: TIMEOUT
+
+  [features "width=-404.5" should NOT set "width=404"]
+    expected: TIMEOUT
+
diff --git a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-height.html.ini b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-height.html.ini
index a70e9dbad4d8..4e44584b123a 100644
--- a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-height.html.ini
+++ b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-height.html.ini
@@ -1,32 +1,48 @@
 [open-features-non-integer-height.html]
   type: testharness
+  expected: TIMEOUT
   [HTML: window.open `features`: non-integer values for feature `height`]
     expected: FAIL
 
   [features "height=405*3" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "height=405.32" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "height=405e1" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "height=405/5" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "height=405^4" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "height=405.5" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "height=405e-1" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "height=405  " should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "height=405LLl" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
+
+  [features "height=/404" should NOT set "height=404"]
+    expected: TIMEOUT
+
+  [top=0,left=0,width=401,: absence of feature "height" should be treated same as "height=0"]
+    expected: TIMEOUT
+
+  [top=0,left=0: absence of feature "height" should be treated same as "height=0"]
+    expected: TIMEOUT
+
+  [features "height=_404" should NOT set "height=404"]
+    expected: TIMEOUT
+
+  [features "height=L404" should NOT set "height=404"]
+    expected: TIMEOUT
 
diff --git a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-innerheight.html.ini b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-innerheight.html.ini
index 779531b4a989..fcaeae5336d9 100644
--- a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-innerheight.html.ini
+++ b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-innerheight.html.ini
@@ -1,32 +1,42 @@
 [open-features-non-integer-innerheight.html]
   type: testharness
+  expected: TIMEOUT
   [HTML: window.open `features`: non-integer values for legacy feature `innerheight`]
     expected: FAIL
 
   [features "innerheight=405e-1" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "innerheight=405LLl" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "innerheight=405^4" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "innerheight=405e1" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "innerheight=405  " should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "innerheight=405/5" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "innerheight=405.32" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "innerheight=405.5" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "innerheight=405*3" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
+
+  [features "innerheight=_404" should NOT set "height=404"]
+    expected: TIMEOUT
+
+  [features "innerheight=L404" should NOT set "height=404"]
+    expected: TIMEOUT
+
+  [features "innerheight=/404" should NOT set "height=404"]
+    expected: TIMEOUT
 
diff --git a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-innerwidth.html.ini b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-innerwidth.html.ini
index 7a1b258d52e7..42327fedd27b 100644
--- a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-innerwidth.html.ini
+++ b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-innerwidth.html.ini
@@ -1,32 +1,42 @@
 [open-features-non-integer-innerwidth.html]
   type: testharness
+  expected: TIMEOUT
   [HTML: window.open `features`: non-integer values for legacy feature `innerwidth`]
     expected: FAIL
 
   [features "innerwidth=405e-1" should set "width=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "innerwidth=405*3" should set "width=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "innerwidth=405.5" should set "width=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "innerwidth=405e1" should set "width=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "innerwidth=405.32" should set "width=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "innerwidth=405  " should set "width=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "innerwidth=405LLl" should set "width=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "innerwidth=405/5" should set "width=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "innerwidth=405^4" should set "width=405"]
-    expected: FAIL
+    expected: TIMEOUT
+
+  [features "innerwidth=/404" should NOT set "width=404"]
+    expected: TIMEOUT
+
+  [features "innerwidth=_404" should NOT set "width=404"]
+    expected: TIMEOUT
+
+  [features "innerwidth=L404" should NOT set "width=404"]
+    expected: TIMEOUT
 
diff --git a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-left.html.ini b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-left.html.ini
index caba4124f0b4..a8e4fe06618c 100644
--- a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-left.html.ini
+++ b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-left.html.ini
@@ -1,32 +1,42 @@
 [open-features-non-integer-left.html]
   type: testharness
+  expected: TIMEOUT
   [HTML: window.open `features`: non-integer values for feature `left`]
     expected: FAIL
 
   [features "left=105e1" should set "left=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "left=105  " should set "left=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "left=105/5" should set "left=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "left=105e-1" should set "left=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "left=105^4" should set "left=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "left=105LLl" should set "left=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "left=105.32" should set "left=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "left=105*3" should set "left=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "left=105.5" should set "left=105"]
-    expected: FAIL
+    expected: TIMEOUT
+
+  [features "left=L104" should NOT set "left=104"]
+    expected: TIMEOUT
+
+  [features "left=/104" should NOT set "left=104"]
+    expected: TIMEOUT
+
+  [features "left=_104" should NOT set "left=104"]
+    expected: TIMEOUT
 
diff --git a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-screenx.html.ini b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-screenx.html.ini
index 9ace8a4cbdbb..64a08faf0e60 100644
--- a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-screenx.html.ini
+++ b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-screenx.html.ini
@@ -1,32 +1,42 @@
 [open-features-non-integer-screenx.html]
   type: testharness
+  expected: TIMEOUT
   [HTML: window.open `features`: non-integer values for legacy feature `screenx`]
     expected: FAIL
 
   [features "screenx=105.5" should set "left=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "screenx=105e1" should set "left=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "screenx=105  " should set "left=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "screenx=105*3" should set "left=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "screenx=105e-1" should set "left=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "screenx=105^4" should set "left=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "screenx=105LLl" should set "left=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "screenx=105/5" should set "left=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "screenx=105.32" should set "left=105"]
-    expected: FAIL
+    expected: TIMEOUT
+
+  [features "screenx=_104" should NOT set "left=104"]
+    expected: TIMEOUT
+
+  [features "screenx=L104" should NOT set "left=104"]
+    expected: TIMEOUT
+
+  [features "screenx=/104" should NOT set "left=104"]
+    expected: TIMEOUT
 
diff --git a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-screeny.html.ini b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-screeny.html.ini
index a82bd0f981ac..4f22ef4ef29f 100644
--- a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-screeny.html.ini
+++ b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-screeny.html.ini
@@ -1,32 +1,42 @@
 [open-features-non-integer-screeny.html]
   type: testharness
+  expected: TIMEOUT
   [HTML: window.open `features`: non-integer values for legacy feature `screeny`]
     expected: FAIL
 
   [features "screeny=405^4" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "screeny=405e-1" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "screeny=405LLl" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "screeny=405e1" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "screeny=405  " should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "screeny=405/5" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "screeny=405*3" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "screeny=405.32" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "screeny=405.5" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
+
+  [features "screeny=_404" should NOT set "height=404"]
+    expected: TIMEOUT
+
+  [features "screeny=L404" should NOT set "height=404"]
+    expected: TIMEOUT
+
+  [features "screeny=/404" should NOT set "height=404"]
+    expected: TIMEOUT
 
diff --git a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-width.html.ini b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-width.html.ini
index 28f93ee71b5d..9d841e61bc00 100644
--- a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-width.html.ini
+++ b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-width.html.ini
@@ -1,32 +1,48 @@
 [open-features-non-integer-width.html]
   type: testharness
+  expected: TIMEOUT
   [HTML: window.open `features`: non-integer values for feature `width`]
     expected: FAIL
 
   [features "width=405^4" should set "width=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "width=405.5" should set "width=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "width=405e1" should set "width=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "width=405  " should set "width=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "width=405.32" should set "width=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "width=405LLl" should set "width=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "width=405*3" should set "width=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "width=405e-1" should set "width=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "width=405/5" should set "width=405"]
-    expected: FAIL
+    expected: TIMEOUT
+
+  [top=0,left=0: absence of feature "width" should be treated same as "width=0"]
+    expected: TIMEOUT
+
+  [features "width=_404" should NOT set "width=404"]
+    expected: TIMEOUT
+
+  [top=0,left=0,height=401,: absence of feature "width" should be treated same as "width=0"]
+    expected: TIMEOUT
+
+  [features "width=/404" should NOT set "width=404"]
+    expected: TIMEOUT
+
+  [features "width=L404" should NOT set "width=404"]
+    expected: TIMEOUT
 
diff --git a/tests/wpt/metadata/webdriver/tests/set_window_rect/set.py.ini b/tests/wpt/metadata/webdriver/tests/set_window_rect/set.py.ini
index 3d9deb34a252..3b9d2fd022d2 100644
--- a/tests/wpt/metadata/webdriver/tests/set_window_rect/set.py.ini
+++ b/tests/wpt/metadata/webdriver/tests/set_window_rect/set.py.ini
@@ -41,3 +41,6 @@
   [test_height_width_larger_than_max]
     expected: FAIL
 
+  [test_negative_x_y]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/workers/constructors/Worker/Worker-constructor.html.ini b/tests/wpt/metadata/workers/constructors/Worker/Worker-constructor.html.ini
deleted file mode 100644
index 80f9a4f15b8a..000000000000
--- a/tests/wpt/metadata/workers/constructors/Worker/Worker-constructor.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[Worker-constructor.html]
-  expected: ERROR
diff --git a/tests/wpt/mozilla/meta/css/transition_calc_implicit.html.ini b/tests/wpt/mozilla/meta/css/transition_calc_implicit.html.ini
deleted file mode 100644
index dbea4f293ad0..000000000000
--- a/tests/wpt/mozilla/meta/css/transition_calc_implicit.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[transition_calc_implicit.html]
-  expected: TIMEOUT
diff --git a/tests/wpt/web-platform-tests/.azure-pipelines.yml b/tests/wpt/web-platform-tests/.azure-pipelines.yml
index 1a8950b870fb..80748691d6fd 100644
--- a/tests/wpt/web-platform-tests/.azure-pipelines.yml
+++ b/tests/wpt/web-platform-tests/.azure-pipelines.yml
@@ -21,7 +21,7 @@ jobs:
 # The affected tests jobs are unconditional for speed, as most PRs have one or
 # more affected tests: https://github.com/web-platform-tests/wpt/issues/13936.
 - job: affected_safari_preview
-  displayName: 'affected tests (Safari Technology Preview)'
+  displayName: 'affected tests: Safari Technology Preview'
   condition: eq(variables['Build.Reason'], 'PullRequest')
   pool:
     vmImage: 'macOS-10.13'
@@ -35,7 +35,7 @@ jobs:
     artifactName: safari-preview-affected-tests
 
 - job: affected_without_changes_safari_preview
-  displayName: 'affected tests without changes (Safari Technology Preview)'
+  displayName: 'affected tests without changes: Safari Technology Preview'
   condition: eq(variables['Build.Reason'], 'PullRequest')
   pool:
     vmImage: 'macOS-10.13'
@@ -68,7 +68,7 @@ jobs:
     displayName: 'Run ./wpt test-jobs'
 
 - job: infrastructure_macOS
-  displayName: 'infrastructure/ tests (macOS)'
+  displayName: 'infrastructure/ tests: macOS'
   dependsOn: decision
   condition: dependencies.decision.outputs['test_jobs.wptrunner_infrastructure']
   pool:
@@ -86,11 +86,11 @@ jobs:
   - template: tools/ci/azure/update_hosts.yml
   - template: tools/ci/azure/update_manifest.yml
   - script: no_proxy='*' ./wpt run --yes --no-manifest-update --manifest MANIFEST.json --metadata infrastructure/metadata/ --log-tbpl $(Build.ArtifactStagingDirectory)/chrome.tbpl.log --log-tbpl-level info --channel dev chrome infrastructure/
-    displayName: 'Run tests (Chrome Dev)'
+    displayName: 'Run tests: Chrome Dev'
   - script: no_proxy='*' ./wpt run --yes --no-manifest-update --manifest MANIFEST.json --metadata infrastructure/metadata/ --log-tbpl $(Build.ArtifactStagingDirectory)/firefox.tbpl.log --log-tbpl-level info --channel nightly firefox infrastructure/
-    displayName: 'Run tests (Firefox Nightly)'
+    displayName: 'Run tests: Firefox Nightly'
   - script: no_proxy='*' ./wpt run --yes --no-manifest-update --manifest MANIFEST.json --metadata infrastructure/metadata/ --log-tbpl $(Build.ArtifactStagingDirectory)/safari.tbpl.log --log-tbpl-level info --channel preview safari infrastructure/
-    displayName: 'Run tests (Safari Technology Preview)'
+    displayName: 'Run tests: Safari Technology Preview'
   - task: PublishBuildArtifacts@1
     displayName: 'Publish results'
     inputs:
@@ -98,7 +98,7 @@ jobs:
     condition: always()
 
 - job: tools_unittest_macOS
-  displayName: 'tools/ unittests (macOS)'
+  displayName: 'tools/ unittests: macOS'
   dependsOn: decision
   condition: dependencies.decision.outputs['test_jobs.tools_unittest']
   pool:
@@ -111,7 +111,7 @@ jobs:
       toxenv: py27
 
 - job: wptrunner_unittest_macOS
-  displayName: 'tools/wptrunner/ unittests (macOS)'
+  displayName: 'tools/wptrunner/ unittests: macOS'
   dependsOn: decision
   condition: dependencies.decision.outputs['test_jobs.wptrunner_unittest']
   pool:
@@ -123,7 +123,7 @@ jobs:
       directory: tools/wptrunner/
 
 - job: wpt_integration_macOS
-  displayName: 'tools/wpt/ tests (macOS)'
+  displayName: 'tools/wpt/ tests: macOS'
   dependsOn: decision
   condition: dependencies.decision.outputs['test_jobs.wpt_integration']
   pool:
@@ -139,7 +139,7 @@ jobs:
       directory: tools/wpt/
 
 - job: tools_unittest_win
-  displayName: 'tools/ unittests (Windows)'
+  displayName: 'tools/ unittests: Windows'
   dependsOn: decision
   condition: dependencies.decision.outputs['test_jobs.tools_unittest']
   pool:
@@ -155,7 +155,7 @@ jobs:
       toxenv: py27
 
 - job: tools_unittest_win_py3
-  displayName: 'tools/ unittests (Windows Python 3)'
+  displayName: 'tools/ unittests: Windows Python 3'
   dependsOn: decision
   condition: dependencies.decision.outputs['test_jobs.tools_unittest']
   pool:
@@ -171,7 +171,7 @@ jobs:
       toxenv: py36
 
 - job: wptrunner_unittest_win
-  displayName: 'tools/wptrunner/ unittests (Windows)'
+  displayName: 'tools/wptrunner/ unittests: Windows'
   dependsOn: decision
   condition: dependencies.decision.outputs['test_jobs.wptrunner_unittest']
   pool:
@@ -186,7 +186,7 @@ jobs:
       directory: tools/wptrunner/
 
 - job: wpt_integration_win
-  displayName: 'tools/wpt/ tests (Windows)'
+  displayName: 'tools/wpt/ tests: Windows'
   dependsOn: decision
   condition: dependencies.decision.outputs['test_jobs.wpt_integration']
   pool:
@@ -207,7 +207,7 @@ jobs:
       directory: tools/wpt/
 
 - job: infrastructure_win10
-  displayName: 'infrastructure/ tests (Windows 10)'
+  displayName: 'infrastructure/ tests: Windows 10'
   # This job is only triggered manually until it has been shown to be robust.
   condition: and(eq(variables['Build.Reason'], 'Manual'), variables['run_infrastructure_win10'])
   pool:
@@ -224,7 +224,7 @@ jobs:
   - template: tools/ci/azure/update_hosts.yml
   - template: tools/ci/azure/update_manifest.yml
   - script: python ./wpt run --yes --no-manifest-update --install-fonts --manifest MANIFEST.json --metadata infrastructure/metadata/ --log-tbpl $(Build.ArtifactStagingDirectory)/edge.tbpl.log --log-tbpl-level info --channel dev edgechromium infrastructure/
-    displayName: 'Run tests (Edge Dev)'
+    displayName: 'Run tests: Edge Dev'
   - task: PublishBuildArtifacts@1
     displayName: 'Publish results'
     inputs:
@@ -235,7 +235,7 @@ jobs:
 # All `./wpt run` tests are run from epochs/* branches on a schedule. See
 # documentation at the top of this file for required setup.
 - job: results_edge
-  displayName: 'all tests (Edge)'
+  displayName: 'all tests: Edge'
   condition: |
     or(eq(variables['Build.Reason'], 'Schedule'),
        and(eq(variables['Build.Reason'], 'Manual'), variables['run_all_edge']))
@@ -257,7 +257,7 @@ jobs:
   - template: tools/ci/azure/update_hosts.yml
   - template: tools/ci/azure/update_manifest.yml
   - script: python ./wpt run --yes --no-manifest-update --no-restart-on-unexpected --no-fail-on-unexpected --install-fonts --this-chunk $(System.JobPositionInPhase) --total-chunks $(System.TotalJobsInPhase) --chunk-type hash --log-tbpl - --log-tbpl-level info --log-wptreport $(Build.ArtifactStagingDirectory)/wpt_report_$(System.JobPositionInPhase).json --log-wptscreenshot $(Build.ArtifactStagingDirectory)/wpt_screenshot_$(System.JobPositionInPhase).txt --channel dev edgechromium
-    displayName: 'Run tests (Edge Dev)'
+    displayName: 'Run tests: Edge Dev'
   - task: PublishBuildArtifacts@1
     displayName: 'Publish results'
     inputs:
@@ -269,7 +269,7 @@ jobs:
     artifactName: edge-results
 
 - job: results_safari
-  displayName: 'all tests (Safari)'
+  displayName: 'all tests: Safari'
   condition: |
     or(eq(variables['Build.Reason'], 'Schedule'),
        and(eq(variables['Build.Reason'], 'Manual'), variables['run_all_safari']))
@@ -305,7 +305,7 @@ jobs:
     artifactName: safari-results
 
 - job: results_safari_preview
-  displayName: 'all tests (Safari Technology Preview)'
+  displayName: 'all tests: Safari Technology Preview'
   condition: |
     or(eq(variables['Build.Reason'], 'Schedule'),
        and(eq(variables['Build.Reason'], 'Manual'), variables['run_all_safari_preview']))
diff --git a/tests/wpt/web-platform-tests/css/css-grid/abspos/absolute-positioning-grid-container-containing-block-001.html b/tests/wpt/web-platform-tests/css/css-grid/abspos/absolute-positioning-grid-container-containing-block-001.html
index e456af8ce0a3..4be43ddba2de 100644
--- a/tests/wpt/web-platform-tests/css/css-grid/abspos/absolute-positioning-grid-container-containing-block-001.html
+++ b/tests/wpt/web-platform-tests/css/css-grid/abspos/absolute-positioning-grid-container-containing-block-001.html
@@ -4,6 +4,7 @@
 <link rel="author" title="Manuel Rego Casasnovas" href="mailto:rego@igalia.com">
 <link rel="help" href="https://drafts.csswg.org/css-grid-1/#abspos" title="9. Absolute Positioning">
 <meta name="assert" content="This test checks the behavior of the absolutely positioned elements with a grid container as containing block.">
+<link rel="stylesheet" href="/fonts/ahem.css">
 <link rel="stylesheet" href="support/grid.css">
 <style>
 
diff --git a/tests/wpt/web-platform-tests/css/css-grid/abspos/absolute-positioning-grid-container-parent-001.html b/tests/wpt/web-platform-tests/css/css-grid/abspos/absolute-positioning-grid-container-parent-001.html
index a7a38ad0a0ab..7025ccf55e9d 100644
--- a/tests/wpt/web-platform-tests/css/css-grid/abspos/absolute-positioning-grid-container-parent-001.html
+++ b/tests/wpt/web-platform-tests/css/css-grid/abspos/absolute-positioning-grid-container-parent-001.html
@@ -4,6 +4,7 @@
 <link rel="author" title="Manuel Rego Casasnovas" href="mailto:rego@igalia.com">
 <link rel="help" href="https://drafts.csswg.org/css-grid-1/#abspos" title="9. Absolute Positioning">
 <meta name="assert" content="This test checks the behavior of the absolutely positioned elements with a grid container as parent.">
+<link rel="stylesheet" href="/fonts/ahem.css">
 <link rel="stylesheet" href="support/grid.css">
 <style>
 
diff --git a/tests/wpt/web-platform-tests/css/css-grid/abspos/grid-positioned-children-writing-modes-001.html b/tests/wpt/web-platform-tests/css/css-grid/abspos/grid-positioned-children-writing-modes-001.html
index eb855279ca8b..d63b1894927b 100644
--- a/tests/wpt/web-platform-tests/css/css-grid/abspos/grid-positioned-children-writing-modes-001.html
+++ b/tests/wpt/web-platform-tests/css/css-grid/abspos/grid-positioned-children-writing-modes-001.html
@@ -5,6 +5,7 @@
 <link rel="help" href="https://drafts.csswg.org/css-grid-1/#abspos" title="9. Absolute Positioning">
 <link rel="match" href="grid-positioned-children-writing-modes-001-ref.html">
 <meta name="assert" content="This test checks the behavior of the positioned grid children in combination with the writing modes and text direction properties.">
+<link rel="stylesheet" href="/fonts/ahem.css">
 <link rel="stylesheet" href="support/grid.css">
 <style>
 
diff --git a/tests/wpt/web-platform-tests/css/css-grid/abspos/grid-positioned-items-background-001.html b/tests/wpt/web-platform-tests/css/css-grid/abspos/grid-positioned-items-background-001.html
index 19ee662e04e1..54146bce2581 100644
--- a/tests/wpt/web-platform-tests/css/css-grid/abspos/grid-positioned-items-background-001.html
+++ b/tests/wpt/web-platform-tests/css/css-grid/abspos/grid-positioned-items-background-001.html
@@ -5,6 +5,7 @@
 <link rel="help" href="https://drafts.csswg.org/css-grid-1/#abspos" title="9. Absolute Positioning">
 <link rel="match" href="grid-positioned-items-background-001-ref.html">
 <meta name="assert" content="This test checks that the background of positioned items is painted in the right position">
+<link rel="stylesheet" href="/fonts/ahem.css">
 <link rel="stylesheet" href="support/grid.css">
 <style>
 
diff --git a/tests/wpt/web-platform-tests/css/css-grid/abspos/grid-positioned-items-background-rtl-001.html b/tests/wpt/web-platform-tests/css/css-grid/abspos/grid-positioned-items-background-rtl-001.html
index 9ed046b42153..97ec1052f4be 100644
--- a/tests/wpt/web-platform-tests/css/css-grid/abspos/grid-positioned-items-background-rtl-001.html
+++ b/tests/wpt/web-platform-tests/css/css-grid/abspos/grid-positioned-items-background-rtl-001.html
@@ -5,6 +5,7 @@
 <link rel="help" href="https://drafts.csswg.org/css-grid-1/#abspos" title="9. Absolute Positioning">
 <link rel="match" href="grid-positioned-items-background-rtl-001-ref.html">
 <meta name="assert" content="This test checks that the background of positioned items is painted in the right position using RTL direction.">
+<link rel="stylesheet" href="/fonts/ahem.css">
 <link rel="stylesheet" href="support/grid.css">
 <style>
 
diff --git a/tests/wpt/web-platform-tests/css/css-grid/abspos/grid-positioned-items-implicit-grid-001.html b/tests/wpt/web-platform-tests/css/css-grid/abspos/grid-positioned-items-implicit-grid-001.html
index 71f096aa74b9..4b1a3d0f342f 100644
--- a/tests/wpt/web-platform-tests/css/css-grid/abspos/grid-positioned-items-implicit-grid-001.html
+++ b/tests/wpt/web-platform-tests/css/css-grid/abspos/grid-positioned-items-implicit-grid-001.html
@@ -5,6 +5,7 @@
 <link rel="help" href="https://drafts.csswg.org/css-grid-1/#abspos" title="9. Absolute Positioning">
 <link rel="help" href="https://drafts.csswg.org/css-grid-1/#implicit-grids" title="7.5. The Implicit Grid">
 <meta name="assert" content="This test checks the behavior of the absolutely positioned grid items placed on the implicit grid.">
+<link rel="stylesheet" href="/fonts/ahem.css">
 <link rel="stylesheet" href="support/grid.css">
 <style>
 
diff --git a/tests/wpt/web-platform-tests/css/css-grid/abspos/grid-positioned-items-implicit-grid-line-001.html b/tests/wpt/web-platform-tests/css/css-grid/abspos/grid-positioned-items-implicit-grid-line-001.html
index 7b8fa4ef7bd6..8fc8918ee68b 100644
--- a/tests/wpt/web-platform-tests/css/css-grid/abspos/grid-positioned-items-implicit-grid-line-001.html
+++ b/tests/wpt/web-platform-tests/css/css-grid/abspos/grid-positioned-items-implicit-grid-line-001.html
@@ -5,6 +5,7 @@
 <link rel="help" href="https://drafts.csswg.org/css-grid-1/#abspos" title="9. Absolute Positioning">
 <link rel="help" href="https://drafts.csswg.org/css-grid-1/#implicit-grids" title="7.5. The Implicit Grid">
 <meta name="assert" content="This test checks that grid placement properties of absolutely positioned items using implicit grid lines are treated as 'auto'.">
+<link rel="stylesheet" href="/fonts/ahem.css">
 <link rel="stylesheet" href="support/grid.css">
 <style>
 
diff --git a/tests/wpt/web-platform-tests/css/css-grid/abspos/grid-positioned-items-unknown-named-grid-line-001.html b/tests/wpt/web-platform-tests/css/css-grid/abspos/grid-positioned-items-unknown-named-grid-line-001.html
index 6e61f7c2de36..663dab45b3db 100644
--- a/tests/wpt/web-platform-tests/css/css-grid/abspos/grid-positioned-items-unknown-named-grid-line-001.html
+++ b/tests/wpt/web-platform-tests/css/css-grid/abspos/grid-positioned-items-unknown-named-grid-line-001.html
@@ -4,6 +4,7 @@
 <link rel="author" title="Manuel Rego Casasnovas" href="mailto:rego@igalia.com">
 <link rel="help" href="https://drafts.csswg.org/css-grid-1/#abspos" title="9. Absolute Positioning">
 <meta name="assert" content="This test checks that grid placement properties of absolutely positioned items can reference implicit grid lines.">
+<link rel="stylesheet" href="/fonts/ahem.css">
 <link rel="stylesheet" href="support/grid.css">
 <style>
 
diff --git a/tests/wpt/web-platform-tests/css/css-grid/abspos/grid-sizing-positioned-items-001.html b/tests/wpt/web-platform-tests/css/css-grid/abspos/grid-sizing-positioned-items-001.html
index 0e8cd3369f7f..e74b2b96fe62 100644
--- a/tests/wpt/web-platform-tests/css/css-grid/abspos/grid-sizing-positioned-items-001.html
+++ b/tests/wpt/web-platform-tests/css/css-grid/abspos/grid-sizing-positioned-items-001.html
@@ -4,6 +4,7 @@
 <link rel="author" title="Manuel Rego Casasnovas" href="mailto:rego@igalia.com">
 <link rel="help" href="https://drafts.csswg.org/css-grid-1/#abspos" title="9. Absolute Positioning">
 <meta name="assert" content="This test checks the different size options for absolutely positioned grid items.">
+<link rel="stylesheet" href="/fonts/ahem.css">
 <link href="support/grid.css" rel="stylesheet">
 <style>
 
diff --git a/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-items-should-not-create-implicit-tracks-001.html b/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-items-should-not-create-implicit-tracks-001.html
index 5ef006ae137c..adb4a7acf275 100644
--- a/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-items-should-not-create-implicit-tracks-001.html
+++ b/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-items-should-not-create-implicit-tracks-001.html
@@ -4,6 +4,7 @@
 <link rel="author" title="Manuel Rego Casasnovas" href="mailto:rego@igalia.com">
 <link rel="help" href="https://drafts.csswg.org/css-grid-1/#abspos" title="9. Absolute Positioning">
 <meta name="assert" content="This test checks that positioned items shouldn't create implicit tracks on the grid.">
+<link rel="stylesheet" href="/fonts/ahem.css">
 <link href="support/grid.css" rel="stylesheet">
 <style>
 
diff --git a/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-items-should-not-take-up-space-001.html b/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-items-should-not-take-up-space-001.html
index 597e778019b6..50f9984370ba 100644
--- a/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-items-should-not-take-up-space-001.html
+++ b/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-items-should-not-take-up-space-001.html
@@ -4,6 +4,7 @@
 <link rel="author" title="Manuel Rego Casasnovas" href="mailto:rego@igalia.com">
 <link rel="help" href="https://drafts.csswg.org/css-grid-1/#abspos" title="9. Absolute Positioning">
 <meta name="assert" content="This test checks that positioned items shouldn't take up space or otherwise participate in the layout of the grid.">
+<link rel="stylesheet" href="/fonts/ahem.css">
 <link href="support/grid.css" rel="stylesheet">
 <style>
 
diff --git a/tests/wpt/web-platform-tests/css/css-overflow/overfow-outside-padding.html b/tests/wpt/web-platform-tests/css/css-overflow/overfow-outside-padding.html
new file mode 100644
index 000000000000..792f7b87351b
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-overflow/overfow-outside-padding.html
@@ -0,0 +1,69 @@
+<!DOCTYPE html>
+<title>CSS Overflow and Transforms: css-overflow-3</title>
+<link rel="author" href="mailto:atotic@google.com">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<link rel="help" href="https://www.w3.org/TR/css-overflow-3/#scrollable">
+<meta name="assert" content="blocks wholly outside padding edges should not contribute to overflow">
+<style>
+.container {
+  position: relative;
+  display: inline-block;
+  border: 5px solid rgba(0,0,0,0.5);
+  border-width: 0px 0px 50px 80px;
+  overflow: auto;
+  width: 200px;
+  height: 200px;
+  background: gray;
+}
+.target {
+  position: absolute;
+  width: 1000px;
+  height: 1000px;
+  background: red;
+}
+.htb {
+  writing-mode: horizontal-tb;
+}
+.vrl {
+  writing-mode: vertical-rl;
+}
+.vlr {
+  writing-mode: vertical-lr;
+}
+.rtl {
+  direction: rtl;
+}
+</style>
+<!--  -->
+<div class="container htb">
+  <div class="target" style="top: -1000px"></div>
+  htb
+</div>
+<div class="container htb rtl">
+  <div class="target" style="right: -1000px" ></div>
+  htb rtl
+</div>
+<div class="container vrl">
+  <div class="target" style="top: -1000px"></div>
+  vrl
+</div>
+<div class="container vrl rtl">
+  <div class="target" style="bottom: -1000px"></div>
+  vrl rtl
+</div>
+<div class="container vlr">
+  <div class="target" style="top: -1000px"></div>
+  vlr
+</div>
+<div class="container vlr rtl">
+  <div class="target" style="left: -1000px"></div>
+  vlr rtl
+</div>
+<script>
+test(() => {
+  Array.from(document.querySelectorAll(".container")).forEach( el => {
+    assert_equals(el.scrollWidth, 200);
+  });
+}, '#target did not trigger scroll overflow');
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-text-decor/reference/text-underline-offset-001-notref.html b/tests/wpt/web-platform-tests/css/css-text-decor/reference/text-underline-offset-001-notref.html
new file mode 100644
index 000000000000..c56078a32ae2
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-text-decor/reference/text-underline-offset-001-notref.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <meta charset="utf-8">
+    <title>Non-reference case for text-underline-offset</title>
+    <style>
+        #main {
+            margin: 2em;
+            display:flex
+        }
+        div span {
+            text-decoration: green underline;
+            font: 20px/1 Ahem;
+            color: transparent;
+            padding-bottom: 20px;
+            border: 1px dotted transparent;
+            border-bottom-color: cyan;
+        }
+    </style>
+</head>
+<body>
+    <p class="instructions">Test passes if the box on the right has a lower underline than the box on the left</p>
+    <div id="main">
+        <div>
+            <p>left<span>XXXX</span></p>
+        </div>
+        <div>
+            <p><span id="rightbox">XXXX</span>right</p>
+        </div>
+    </div>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-text-decor/reference/text-underline-offset-002-ref.html b/tests/wpt/web-platform-tests/css/css-text-decor/reference/text-underline-offset-002-ref.html
new file mode 100644
index 000000000000..ed2e3cefff82
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-text-decor/reference/text-underline-offset-002-ref.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <meta charset="utf-8">
+    <title>Reference case for text-underline-offset</title>
+    <style>
+        #main{
+            border-bottom: 1px solid cyan;
+            display: flex;
+        }
+        #text, #norm{
+            text-decoration: green underline;
+            text-underline-offset: 0px;
+            font: 20px/1 Ahem;
+            color: transparent;
+            position: relative;
+            top: 21px;
+            margin-right: 10px;
+        }
+    </style>
+</head>
+<body >
+    <p class="instructions">Test passes if the lines are at the same level</p>
+    <div id="main">
+        <div>
+            <p>left<span id="text">XXXX</span></p>
+        </div>
+        <div>
+            <p><span id="norm">XXXX</span>right</p>
+        </div>
+    </div>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-text-decor/text-underline-offset-001.html b/tests/wpt/web-platform-tests/css/css-text-decor/text-underline-offset-001.html
new file mode 100644
index 000000000000..41a7d418a21d
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-text-decor/text-underline-offset-001.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <meta charset="utf-8">
+    <title>text-underline-offset test case</title>
+    <meta name="assert" content="text-decoration:underline; there is a line at or under the alphabetic baseline">
+    <link rel="author" title="Charlie Marlow" href="mailto:cmarlow@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <link rel="help" href="https://drafts.csswg.org/css-text-decor-4/#underline-offset">
+    <link rel="mismatch" href="reference/text-underline-offset-001-notref.html">
+    <style>
+        #main {
+            margin: 2em;
+            display:flex
+        }
+        div span {
+            text-decoration: green underline;
+            font: 20px/1 Ahem;
+            color: transparent;
+            padding-bottom: 20px;
+            border: 1px dotted transparent;
+            border-bottom-color: cyan;
+        }
+        #rightbox {
+            text-underline-offset: -24px;
+        }
+    </style>
+</head>
+<body>
+    <p class="instructions">Test passes if the box on the right has a lower underline than the box on the left</p>
+    <div id="main">
+        <div>
+            <p>left<span>XXXX</span></p>
+        </div>
+        <div>
+            <p><span id="rightbox">XXXX</span>right</p>
+        </div>
+    </div>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-text-decor/text-underline-offset-002.html b/tests/wpt/web-platform-tests/css/css-text-decor/text-underline-offset-002.html
new file mode 100644
index 000000000000..56ba764a0fa0
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-text-decor/text-underline-offset-002.html
@@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <meta charset="utf-8">
+    <title>Test case for text-underline-offset</title>
+    <link rel="author" title="Charlie Marlow" href="mailto:cmarlow@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <link rel="help" href="https://drafts.csswg.org/css-text-decor-4/#underline-offset">
+    <link rel="match" href="reference/text-underline-offset-002-ref.html">
+    <style>
+        #main{
+            border-bottom: 1px solid cyan;
+            display: flex;
+        }
+        #text, #norm{
+            text-decoration: green underline;
+            font: 20px/1 Ahem;
+            color: transparent;
+            position: relative;
+            margin-right: 10px;
+        }
+        #text{
+            top: 10px;
+            text-underline-offset: -11px;
+        }
+        #norm{
+            top: 21px;
+            text-underline-offset: 0px;
+        }
+    </style>
+</head>
+<body >
+    <p class="instructions">Test passes if the lines are at the same level</p>
+    <div id="main">
+        <div>
+            <p>left<span id="text">XXXX</span></p>
+        </div>
+        <div>
+            <p><span id="norm">XXXX</span>right</p>
+        </div>
+    </div>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/cssom/getComputedStyle-width-scroll.tentative.html b/tests/wpt/web-platform-tests/css/cssom/getComputedStyle-width-scroll.tentative.html
new file mode 100644
index 000000000000..8f629c70161b
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/cssom/getComputedStyle-width-scroll.tentative.html
@@ -0,0 +1,26 @@
+<!doctype html>
+<title>getComputedStyle() round-trips in presence of scrollbars.</title>
+<link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez">
+<link rel="author" href="https://mozilla.org" title="Mozilla">
+<link rel="help" href="https://drafts.csswg.org/cssom/#resolved-value">
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<div style="width: 100px; height: 100px; overflow: scroll"></div>
+<script>
+// NOTE(emilio): This is a .tentative.html because the spec is not clear on
+// what the used value of `width` or `height` is, but I think this behavior
+// should be uncontroversial.
+test(function() {
+  let e = document.querySelector("div");
+  let cs = getComputedStyle(e);
+
+  let originalWidth = cs.width;
+  let originalHeight = cs.height;
+
+  e.style.width = originalWidth;
+  e.style.height = originalHeight;
+
+  assert_equals(cs.width, originalWidth, "width round-trips");
+  assert_equals(cs.height, originalHeight, "height round-trips");
+}, "getComputedStyle() round-trips in presence of scrollbars")
+</script>
diff --git a/tests/wpt/web-platform-tests/css/filter-effects/backdrop-filter-edge-clipping.html b/tests/wpt/web-platform-tests/css/filter-effects/backdrop-filter-edge-clipping.html
new file mode 100644
index 000000000000..5d09c414497d
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/filter-effects/backdrop-filter-edge-clipping.html
@@ -0,0 +1,62 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>backdrop-filter: Filter input is at element bounds</title>
+<link rel="author" title="Mason Freed" href="mailto:masonfreed@chromium.org">
+<link rel="help" href="https://drafts.fxtf.org/filter-effects-2/#BackdropFilterProperty">
+<link rel="match"  href="backdrop-filter-paint-order-ref.html">
+
+<div>
+  <p>Expected: A pure white box with a blue border, surrounded by green.<br>
+  No green should be observed within the white box.<br>
+  No dark/black should be observed within the white box either.</p>
+</div>
+
+<div class="greenbox top"></div>
+<div class="greenbox right"></div>
+<div class="greenbox bottom"></div>
+<div class="filterbox">
+  <div class="children" style="top:-31px;left:35px;"></div>
+  <div class="children" style="top:101px;left:35px;"></div>
+  <div class="children" style="top:35px;left:101px;"></div>
+  <div class="children" style="top:35px;left:-31px;"></div>
+</div>
+<style>
+.filterbox {
+  position: absolute;
+  width: 100px;
+  height: 100px;
+  top: 150px;
+  left: 0px;
+  border: 1px solid blue;
+  backdrop-filter: blur(20px);
+}
+.greenbox {
+  position:absolute;
+  width: 150px;
+  height: 50px;
+  background: green;
+}
+.top {
+  top:100px;
+  left: 10px;
+}
+.right {
+  top:130px;
+  left: 102px;
+  width: 58px;
+  height: 150px;
+}
+.bottom {
+  top:252px;
+  left: 10px;
+}
+.children {
+  position: absolute;
+  width: 30px;
+  height: 30px;
+  top: 0px;
+  left: 0px;
+  background: green;
+}
+</style>
+
diff --git a/tests/wpt/web-platform-tests/css/filter-effects/backdrop-filter-plus-filter-ref.html b/tests/wpt/web-platform-tests/css/filter-effects/backdrop-filter-plus-filter-ref.html
new file mode 100644
index 000000000000..bf476ea63f81
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/filter-effects/backdrop-filter-plus-filter-ref.html
@@ -0,0 +1,49 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>backdrop-filter: Only filter objects painted before</title>
+<link rel="author" title="Mason Freed" href="mailto:masonfreed@chromium.org">
+
+
+
+<p>Expected: A green box with an overlapping purple box.<br>
+The overlapping portion of the boxes should be bright magenta.<br>
+
+<div class="container">
+  <div class="orangebox"></div>
+  <div class="bluebox blur-bd"></div>
+  <div class="invert"></div>
+</div>
+
+
+<style>
+div {
+  position: absolute;
+  width: 100px;
+  height: 100px;
+}
+.container {
+  width:200px;
+  height:200px;
+  top: 50px;
+  position:absolute;
+}
+.blur-bd {
+  backdrop-filter: blur(10px);
+}
+.orangebox {
+  left: 10px;
+  top: 50px;
+  background: green;
+}
+.bluebox {
+  left: 60px;
+  top: 110px;
+  background: #00ff0055;
+}
+.invert {
+  left: 60px;
+  top: 110px;
+  background: transparent;
+  backdrop-filter: invert(1);
+}
+</style>
diff --git a/tests/wpt/web-platform-tests/css/filter-effects/backdrop-filter-plus-filter.html b/tests/wpt/web-platform-tests/css/filter-effects/backdrop-filter-plus-filter.html
new file mode 100644
index 000000000000..3a2d8feaeefc
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/filter-effects/backdrop-filter-plus-filter.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>backdrop-filter: Correctly apply filters to backdrop-filter content</title>
+<link rel="author" title="Mason Freed" href="mailto:masonfreed@chromium.org">
+<link rel="help" href="https://drafts.fxtf.org/filter-effects-2/#BackdropFilterProperty">
+<link rel="match"  href="backdrop-filter-plus-filter-ref.html">
+
+<p>Expected: A green box with an overlapping purple box.<br>
+The overlapping portion of the boxes should be bright magenta.<br>
+
+<div class="container">
+  <div class="orangebox"></div>
+  <div class="bluebox blur blur-bd"></div>
+</div>
+
+
+<style>
+div {
+  position: absolute;
+  width: 100px;
+  height: 100px;
+}
+.container {
+  width:200px;
+  height:200px;
+  top: 50px;
+  position:absolute;
+}
+.blur {
+  filter: invert(1);
+}
+.blur-bd {
+  backdrop-filter: blur(10px);
+}
+.orangebox {
+  left: 10px;
+  top: 50px;
+  background: green;
+}
+.bluebox {
+  left: 60px;
+  top: 110px;
+  background: #00ff0055;
+}
+</style>
diff --git a/tests/wpt/web-platform-tests/html/semantics/embedded-content/media-elements/track/track-element/track-webvtt-non-snap-to-lines-ref.html b/tests/wpt/web-platform-tests/html/semantics/embedded-content/media-elements/track/track-element/track-webvtt-non-snap-to-lines-ref.html
index 92c1e9fedf9a..137a9334f286 100644
--- a/tests/wpt/web-platform-tests/html/semantics/embedded-content/media-elements/track/track-element/track-webvtt-non-snap-to-lines-ref.html
+++ b/tests/wpt/web-platform-tests/html/semantics/embedded-content/media-elements/track/track-element/track-webvtt-non-snap-to-lines-ref.html
@@ -10,12 +10,12 @@
 }
 .cue {
   position: absolute;
-  top: 48px;
+  top: 30px;
+  left: 0px;
   font-family: sans-serif;
   background: green;
   color: rgba(255, 255, 255, 1);
-  font-size: 12px;
-  padding: 0px 2px;
+  font-size: 7.5px;
 }
 </style>
 <div class="container">
@@ -26,4 +26,4 @@
   </video>
   <span class="cue">Bear is Coming!!!!!</span>
 </div>
-</html>
\ No newline at end of file
+</html>
diff --git a/tests/wpt/web-platform-tests/html/semantics/embedded-content/media-elements/track/track-element/track-webvtt-non-snap-to-lines.html b/tests/wpt/web-platform-tests/html/semantics/embedded-content/media-elements/track/track-element/track-webvtt-non-snap-to-lines.html
index 0da8c6f83d54..ec350ff44d56 100644
--- a/tests/wpt/web-platform-tests/html/semantics/embedded-content/media-elements/track/track-element/track-webvtt-non-snap-to-lines.html
+++ b/tests/wpt/web-platform-tests/html/semantics/embedded-content/media-elements/track/track-element/track-webvtt-non-snap-to-lines.html
@@ -21,4 +21,4 @@
 track.mode = "showing";
 video.src = getVideoURI("/media/test");
 </script>
-</html>
\ No newline at end of file
+</html>
diff --git a/tests/wpt/web-platform-tests/html/semantics/embedded-content/media-elements/track/track-element/track-webvtt-two-cue-layout-after-first-end-ref.html b/tests/wpt/web-platform-tests/html/semantics/embedded-content/media-elements/track/track-element/track-webvtt-two-cue-layout-after-first-end-ref.html
index c0415367cc13..1c8f751c2ceb 100644
--- a/tests/wpt/web-platform-tests/html/semantics/embedded-content/media-elements/track/track-element/track-webvtt-two-cue-layout-after-first-end-ref.html
+++ b/tests/wpt/web-platform-tests/html/semantics/embedded-content/media-elements/track/track-element/track-webvtt-two-cue-layout-after-first-end-ref.html
@@ -15,9 +15,11 @@
 cue.line = -2;
 track.addCue(cue);
 track.mode = "showing";
-
-video.onloadeddata = function() {
+video.play();
+video.onplaying = function() {
+  video.onplaying=null;
+  video.pause();
   takeScreenshot();
 };
 </script>
-</html>
\ No newline at end of file
+</html>
diff --git a/tests/wpt/web-platform-tests/html/semantics/embedded-content/media-elements/track/track-element/track-webvtt-two-cue-layout-after-first-end.html b/tests/wpt/web-platform-tests/html/semantics/embedded-content/media-elements/track/track-element/track-webvtt-two-cue-layout-after-first-end.html
index c90313c887c0..df816ffe2b9b 100644
--- a/tests/wpt/web-platform-tests/html/semantics/embedded-content/media-elements/track/track-element/track-webvtt-two-cue-layout-after-first-end.html
+++ b/tests/wpt/web-platform-tests/html/semantics/embedded-content/media-elements/track/track-element/track-webvtt-two-cue-layout-after-first-end.html
@@ -11,20 +11,16 @@
 // Add two cues, where the first cue ends before the second.
 var video = document.querySelector("video");
 var track = video.addTextTrack("captions");
-track.addCue(new VTTCue(0, 1, "cue 1"));
-track.addCue(new VTTCue(0, 3, "cue 2"));
+let cue1 = new VTTCue(-1, 1, "cue 1");
+track.addCue(cue1);
+// As video's duration is 10s, it ensures that this cue would always be displayed.
+track.addCue(new VTTCue(0, 10, "cue 2"));
 track.mode = "showing";
-
-video.onloadeddata = function() {
-  // Double nesting of requestAnimationFrame to
-  // make sure cue layout and paint happens.
-  window.requestAnimationFrame(function() {
-    window.requestAnimationFrame(function() {
-      // Seek past the end of the first cue. The second cue should not move.
-      video.currentTime = 2;
-      video.onseeked = function() { takeScreenshot(); };
-    });
-  });
+video.play();
+cue1.onexit = () => {
+  cue1.onexit = null;
+  video.pause();
+  takeScreenshot();
 };
 </script>
-</html>
\ No newline at end of file
+</html>
diff --git a/tests/wpt/web-platform-tests/interfaces/geometry.idl b/tests/wpt/web-platform-tests/interfaces/geometry.idl
index b5b56e780542..5d5fe4fc2c48 100644
--- a/tests/wpt/web-platform-tests/interfaces/geometry.idl
+++ b/tests/wpt/web-platform-tests/interfaces/geometry.idl
@@ -81,6 +81,7 @@ dictionary DOMRectInit {
     unrestricted double height = 0;
 };
 
+[Exposed=Window]
 interface DOMRectList {
     readonly attribute unsigned long length;
     getter DOMRect? item(unsigned long index);
diff --git a/tests/wpt/web-platform-tests/interfaces/web-nfc.idl b/tests/wpt/web-platform-tests/interfaces/web-nfc.idl
index 26f32a04ac98..a50d53b57cd1 100644
--- a/tests/wpt/web-platform-tests/interfaces/web-nfc.idl
+++ b/tests/wpt/web-platform-tests/interfaces/web-nfc.idl
@@ -43,7 +43,7 @@ interface NFCReader : EventTarget {
 [Constructor(DOMString type, NFCReadingEventInit readingEventInitDict), SecureContext, Exposed=Window]
 interface NFCReadingEvent : Event {
   readonly attribute DOMString serialNumber;
-  readonly attribute NDEFMessage message;
+  readonly attribute object message;  // NDEFMessage
 };
 
 dictionary NFCReadingEventInit : EventInit {
diff --git a/tests/wpt/web-platform-tests/interfaces/webrtc.idl b/tests/wpt/web-platform-tests/interfaces/webrtc.idl
index 4b5d1c1c5818..b18d4ac2b46e 100644
--- a/tests/wpt/web-platform-tests/interfaces/webrtc.idl
+++ b/tests/wpt/web-platform-tests/interfaces/webrtc.idl
@@ -612,7 +612,7 @@ dictionary RTCStatsEventInit : EventInit {
 
 [
     Exposed=Window,
-    Constructor(RTCErrorInit init, optional DOMString message = "")] interface RTCError {
+    Constructor(RTCErrorInit init, optional DOMString message = "")] interface RTCError : DOMException {
     readonly attribute RTCErrorDetailType errorDetail;
     readonly attribute long? sdpLineNumber;
     readonly attribute long? httpRequestStatusCode;
diff --git a/tests/wpt/web-platform-tests/interfaces/webxr.idl b/tests/wpt/web-platform-tests/interfaces/webxr.idl
index 9b48a0f90402..f9bfdce58425 100644
--- a/tests/wpt/web-platform-tests/interfaces/webxr.idl
+++ b/tests/wpt/web-platform-tests/interfaces/webxr.idl
@@ -28,9 +28,16 @@ enum XREnvironmentBlendMode {
   "alpha-blend",
 };
 
+enum XRVisibilityState {
+  "visible",
+  "visible-blurred",
+  "hidden",
+};
+
 [SecureContext, Exposed=Window] interface XRSession : EventTarget {
   // Attributes
   readonly attribute XREnvironmentBlendMode environmentBlendMode;
+  readonly attribute XRVisibilityState visibilityState;
   [SameObject] readonly attribute XRRenderState renderState;
   [SameObject] readonly attribute XRInputSourceArray inputSources;
 
@@ -44,29 +51,26 @@ enum XREnvironmentBlendMode {
   Promise<void> end();
 
   // Events
-  attribute EventHandler onblur;
-  attribute EventHandler onfocus;
   attribute EventHandler onend;
   attribute EventHandler onselect;
   attribute EventHandler oninputsourceschange;
   attribute EventHandler onselectstart;
   attribute EventHandler onselectend;
+  attribute EventHandler onvisibilitychange;
 };
 
 dictionary XRRenderStateInit {
   double depthNear;
   double depthFar;
   double inlineVerticalFieldOfView;
-  XRLayer? baseLayer;
-  XRPresentationContext? outputContext;
+  XRWebGLLayer? baseLayer;
 };
 
 [SecureContext, Exposed=Window] interface XRRenderState {
   readonly attribute double depthNear;
   readonly attribute double depthFar;
   readonly attribute double? inlineVerticalFieldOfView;
-  readonly attribute XRLayer? baseLayer;
-  readonly attribute XRPresentationContext? outputContext;
+  readonly attribute XRWebGLLayer? baseLayer;
 };
 
 callback XRFrameRequestCallback = void (DOMHighResTimeStamp time, XRFrame frame);
@@ -182,8 +186,6 @@ enum GamepadMappingType {
   "xr-standard",
 };
 
-[SecureContext, Exposed=Window] interface XRLayer {};
-
 typedef (WebGLRenderingContext or
          WebGL2RenderingContext) XRWebGLRenderingContext;
 
@@ -199,7 +201,7 @@ dictionary XRWebGLLayerInit {
 [SecureContext, Exposed=Window, Constructor(XRSession session,
              XRWebGLRenderingContext context,
              optional XRWebGLLayerInit layerInit)]
-interface XRWebGLLayer : XRLayer {
+interface XRWebGLLayer {
   // Attributes
   [SameObject] readonly attribute XRWebGLRenderingContext context;
 
@@ -225,10 +227,6 @@ partial interface mixin WebGLRenderingContextBase {
     Promise<void> makeXRCompatible();
 };
 
-[SecureContext, Exposed=Window] interface XRPresentationContext {
-  [SameObject] readonly attribute HTMLCanvasElement canvas;
-};
-
 [SecureContext, Exposed=Window, Constructor(DOMString type, XRSessionEventInit eventInitDict)]
 interface XRSessionEvent : Event {
   [SameObject] readonly attribute XRSession session;
diff --git a/tests/wpt/web-platform-tests/intersection-observer/root-margin-root-element.html b/tests/wpt/web-platform-tests/intersection-observer/root-margin-root-element.html
new file mode 100644
index 000000000000..6016d45bdf52
--- /dev/null
+++ b/tests/wpt/web-platform-tests/intersection-observer/root-margin-root-element.html
@@ -0,0 +1,90 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="./resources/intersection-observer-test-utils.js"></script>
+
+<style>
+pre, #log {
+  position: absolute;
+  top: 0;
+  left: 200px;
+}
+.spacer {
+  height: calc(100vh + 100px);
+}
+#root {
+  display: inline-block;
+  overflow-y: scroll;
+  height: 200px;
+  border: 3px solid black;
+}
+#target {
+  width: 100px;
+  height: 100px;
+  background-color: green;
+}
+</style>
+
+<div class="spacer"></div>
+<div id="root">
+  <div style="height: 300px;"></div>
+  <div id="target"></div>
+</div>
+<div class="spacer"></div>
+
+<script>
+var vw = document.documentElement.clientWidth;
+var vh = document.documentElement.clientHeight;
+
+var entries = [];
+var root, target;
+
+runTestCycle(function() {
+  target = document.getElementById("target");
+  assert_true(!!target, "target exists");
+  root = document.getElementById("root");
+  assert_true(!!root, "root exists");
+  var observer = new IntersectionObserver(function(changes) {
+    entries = entries.concat(changes)
+  }, { root: root, rootMargin: "10px 20% 40% 30px" });
+  observer.observe(target);
+  entries = entries.concat(observer.takeRecords());
+  assert_equals(entries.length, 0, "No initial notifications.");
+  runTestCycle(step0, "First rAF");
+}, "Root margin with explicit root.");
+
+function step0() {
+  document.scrollingElement.scrollTop = vh;
+  runTestCycle(step1, "document.scrollingElement.scrollTop = window.innerHeight.");
+  checkLastEntry(entries, 0, [ 11, 111, vh + 411, vh + 511, 0, 0, 0, 0, -19, 131, vh + 101, vh + 391, false]);
+}
+
+function step1() {
+  root.scrollTop = 50;
+  runTestCycle(step2, "root.scrollTop = 50, putting target into root margin");
+  assert_equals(entries.length, 1, "No notifications after scrolling frame.");
+}
+
+function step2() {
+  document.scrollingElement.scrollTop = 0;
+  runTestCycle(step3, "document.scrollingElement.scrollTop = 0.");
+  checkLastEntry(entries, 1, [11, 111, 361, 461, 11, 111, 361, 391, -19, 131, 101, 391, true]);
+}
+
+function step3() {
+  root.scrollTop = 0;
+  runTestCycle(step4, "root.scrollTop = 0");
+  checkLastEntry(entries, 1);
+}
+
+function step4() {
+  root.scrollTop = 50;
+  runTestCycle(step5, "root.scrollTop = 50 with root scrolled out of view.");
+  checkLastEntry(entries, 2, [ 11, 111, vh + 411, vh + 511, 0, 0, 0, 0, -19, 131, vh + 101, vh + 391, false]);
+}
+
+// This tests that notifications are generated even when the root element is off screen.
+function step5() {
+  checkLastEntry(entries, 3, [11, 111, vh + 361, vh + 461, 11, 111, vh + 361, vh + 391, -19, 131, vh + 101, vh + 391, true]);
+}
+</script>
diff --git a/tests/wpt/web-platform-tests/mathml/presentation-markup/direction/direction-overall-ref.html b/tests/wpt/web-platform-tests/mathml/presentation-markup/direction/direction-overall-ref.html
new file mode 100644
index 000000000000..1f823e5b0c35
--- /dev/null
+++ b/tests/wpt/web-platform-tests/mathml/presentation-markup/direction/direction-overall-ref.html
@@ -0,0 +1,51 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8"/>
+    <title>Verify dir attribute on various containers</title>
+  </head>
+  <body>
+    <p>
+      math:
+      <math>
+        <mspace width="25px" height="25px" mathbackground="blue"/>
+        <mspace width="25px" height="25px" mathbackground="green"/>
+        <mspace width="25px" height="25px" mathbackground="red"/>
+      </math>
+    </p>
+
+    <p>
+      mrow:
+      <math>
+        <mrow>
+          <mspace width="25px" height="25px" mathbackground="blue"/>
+          <mspace width="25px" height="25px" mathbackground="green"/>
+          <mspace width="25px" height="25px" mathbackground="red"/>
+        </mrow>
+      </math>
+    </p>
+
+    <p>
+      mstyle:
+      <math>
+        <mstyle>
+          <mspace width="25px" height="25px" mathbackground="blue"/>
+          <mspace width="25px" height="25px" mathbackground="green"/>
+          <mspace width="25px" height="25px" mathbackground="red"/>
+        </mstyle>
+      </math>
+    </p>
+
+    <p>
+      msqrt:
+      <math>
+        <msqrt>
+          <mspace width="25px" height="25px" mathbackground="red"/>
+          <mspace width="25px" height="25px" mathbackground="green"/>
+          <mspace width="25px" height="25px" mathbackground="blue"/>
+        </msqrt>
+      </math>
+    </p>
+
+  </body>
+</html>
diff --git a/tests/wpt/web-platform-tests/mathml/presentation-markup/direction/direction-overall.html b/tests/wpt/web-platform-tests/mathml/presentation-markup/direction/direction-overall.html
new file mode 100644
index 000000000000..7f377e540f43
--- /dev/null
+++ b/tests/wpt/web-platform-tests/mathml/presentation-markup/direction/direction-overall.html
@@ -0,0 +1,61 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8"/>
+    <title>Verify dir attribute on various containers</title>
+    <link rel="help" href="https://mathml-refresh.github.io/mathml-core/#attributes-common-to-html-and-mathml-elements">
+    <meta name="assert" content="Verify dir attribute on various containers.">
+    <link rel="match" href="direction-overall-ref.html">
+  </head>
+  <body>
+
+    <!-- Test dir="rtl" on <math>, <mrow> and <mstyle> elements. The rectangle
+         inside these elements should be displayed right-to-left.  -->
+
+    <p>
+      math:
+      <math dir="rtl">
+        <mspace width="25px" height="25px" mathbackground="red"/>
+        <mspace width="25px" height="25px" mathbackground="green"/>
+        <mspace width="25px" height="25px" mathbackground="blue"/>
+      </math>
+    </p>
+
+    <p>
+      mrow:
+      <math>
+        <mrow dir="rtl">
+          <mspace width="25px" height="25px" mathbackground="red"/>
+          <mspace width="25px" height="25px" mathbackground="green"/>
+          <mspace width="25px" height="25px" mathbackground="blue"/>
+        </mrow>
+      </math>
+    </p>
+
+    <p>
+      mstyle:
+      <math>
+        <mstyle dir="rtl">
+          <mspace width="25px" height="25px" mathbackground="red"/>
+          <mspace width="25px" height="25px" mathbackground="green"/>
+          <mspace width="25px" height="25px" mathbackground="blue"/>
+        </mstyle>
+      </math>
+    </p>
+
+    <!-- dir="rtl" on <msqrt> should be ignored. The rectangle
+         inside this element should be displayed left-to-right. -->
+
+    <p>
+      msqrt:
+      <math>
+        <msqrt dir="rtl">
+          <mspace width="25px" height="25px" mathbackground="red"/>
+          <mspace width="25px" height="25px" mathbackground="green"/>
+          <mspace width="25px" height="25px" mathbackground="blue"/>
+        </msqrt>
+      </math>
+    </p>
+
+  </body>
+</html>
diff --git a/tests/wpt/web-platform-tests/mathml/presentation-markup/direction/direction-token-ref.html b/tests/wpt/web-platform-tests/mathml/presentation-markup/direction/direction-token-ref.html
new file mode 100644
index 000000000000..95f182bc8c71
--- /dev/null
+++ b/tests/wpt/web-platform-tests/mathml/presentation-markup/direction/direction-token-ref.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<html dir="rtl">
+  <head>
+    <meta charset="utf-8"/>
+    <title>Verify dir attribute on token elements</title>
+  </head>
+  <body>
+
+    <!-- Test dir="rtl" on MathML token elements. The text contains RTL and
+         LTR characters, so the attribute is needed to specify the actual
+         direction. -->
+
+   <p><math><mtext dir="rtl">חוק \left חסר או חוק \right מיותר</mtext></math></p>
+   <p><math><ms dir="rtl">חוק \left חסר או חוק \right מיותר</ms></math></p>
+   <p><math><mo dir="rtl">חוק \left חסר או חוק \right מיותר</mo></math></p>
+   <p><math><mi dir="rtl">חוק \left חסר או חוק \right מיותר</mi></math></p>
+   <p><math><mn dir="rtl">חוק \left חסר או חוק \right מיותר</mn></math></p>
+
+  </body>
+</html>
diff --git a/tests/wpt/web-platform-tests/mathml/presentation-markup/direction/direction-token.html b/tests/wpt/web-platform-tests/mathml/presentation-markup/direction/direction-token.html
new file mode 100644
index 000000000000..a02793cc84ac
--- /dev/null
+++ b/tests/wpt/web-platform-tests/mathml/presentation-markup/direction/direction-token.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html dir="rtl">
+  <head>
+    <meta charset="utf-8"/>
+    <title>Verify dir attribute on token elements</title>
+    <link rel="help" href="https://mathml-refresh.github.io/mathml-core/#attributes-common-to-html-and-mathml-elements">
+    <meta name="assert" content="Verify dir attribute on various token elements.">
+    <link rel="match" href="direction-token-ref.html">
+  </head>
+  <body>
+
+    <!-- Test dir="rtl" on MathML token elements. The text contains RTL and
+         LTR characters, so the attribute is needed to specify the actual
+         direction. -->
+
+   <p><math><mtext dir="rtl">חוק \left חסר או חוק \right מיותר</mtext></math></p>
+   <p><math><ms dir="rtl">חוק \left חסר או חוק \right מיותר</ms></math></p>
+   <p><math><mo dir="rtl">חוק \left חסר או חוק \right מיותר</mo></math></p>
+   <p><math><mi dir="rtl">חוק \left חסר או חוק \right מיותר</mi></math></p>
+   <p><math><mn dir="rtl">חוק \left חסר או חוק \right מיותר</mn></math></p>
+
+  </body>
+</html>
diff --git a/tests/wpt/web-platform-tests/mathml/presentation-markup/direction/direction.html b/tests/wpt/web-platform-tests/mathml/presentation-markup/direction/direction.html
new file mode 100644
index 000000000000..05ea8b74fb5f
--- /dev/null
+++ b/tests/wpt/web-platform-tests/mathml/presentation-markup/direction/direction.html
@@ -0,0 +1,38 @@
+<!DOCTYPE html>
+<html dir="rtl">
+<head>
+<meta charset="utf-8"/>
+<title>Verify computed direction</title>
+<link rel="help" href="https://mathml-refresh.github.io/mathml-core/#attributes-common-to-html-and-mathml-elements">
+<meta name="assert" content="Verify computed direction value.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+  setup({ explicit_done: true });
+  window.addEventListener("load", runTests);
+  function runTests() {
+    test(function() {
+      assert_equals(window.getComputedStyle(document.getElementById('x1')).direction, "ltr");
+      assert_equals(window.getComputedStyle(document.getElementById('x2')).direction, "ltr");
+      assert_equals(window.getComputedStyle(document.getElementById('x3')).direction, "ltr");
+      assert_equals(window.getComputedStyle(document.getElementById('x4')).direction, "rtl");
+    }, "Check direction");
+
+    done();
+  }
+</script>
+</head>
+<body>
+  <!-- Test the CSS direction and dir attribute on the <math> element. It
+       should be "ltr", except if an explicit dir="rtl" is used. -->
+
+    <p>שורשי משוואה מודגשת זו <math id="x1"> <mstyle mathvariant="bold"> <msup> <mi>y</mi> <mn>3</mn> </msup> <mo>+</mo> <mi>p</mi> <mi>y</mi> <mo>+</mo> <mi>q</mi> <mo>=</mo> <mn>0</mn> </mstyle> </math> מודגשים גם הם</p>
+
+    <p>שורשי משוואה מודגשת זו <math id="x2" dir="ltr"> <mstyle mathvariant="bold"> <msup> <mi>y</mi> <mn>3</mn> </msup> <mo>+</mo> <mi>p</mi> <mi>y</mi> <mo>+</mo> <mi>q</mi> <mo>=</mo> <mn>0</mn> </mstyle> </math> מודגשים גם הם</p>
+
+    <p>שורשי משוואה מודגשת זו <math id="x3" dir="invalid"> <mstyle mathvariant="bold"> <msup> <mi>y</mi> <mn>3</mn> </msup> <mo>+</mo> <mi>p</mi> <mi>y</mi> <mo>+</mo> <mi>q</mi> <mo>=</mo> <mn>0</mn> </mstyle> </math> מודגשים גם הם</p>
+
+    <p>שורשי משוואה מודגשת זו <math id="x4" dir="rtl"> <mstyle mathvariant="bold"> <msup> <mi>y</mi> <mn>3</mn> </msup> <mo>+</mo> <mi>p</mi> <mi>y</mi> <mo>+</mo> <mi>q</mi> <mo>=</mo> <mn>0</mn> </mstyle> </math> מודגשים גם הם</p>
+
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/media-source/mediasource-play.html b/tests/wpt/web-platform-tests/media-source/mediasource-play.html
index 62fb04681ae2..2129b8f4730f 100644
--- a/tests/wpt/web-platform-tests/media-source/mediasource-play.html
+++ b/tests/wpt/web-platform-tests/media-source/mediasource-play.html
@@ -3,6 +3,7 @@
 <html>
     <head>
         <title>Simple MediaSource playback test case.</title>
+        <meta name="timeout" content="long">
         <script src="/resources/testharness.js"></script>
         <script src="/resources/testharnessreport.js"></script>
         <script src="mediasource-util.js"></script>
diff --git a/tests/wpt/web-platform-tests/mediacapture-streams/MediaStream-MediaElement-firstframe.https.html b/tests/wpt/web-platform-tests/mediacapture-streams/MediaStream-MediaElement-firstframe.https.html
index 1c6292458865..714ae01b19cc 100644
--- a/tests/wpt/web-platform-tests/mediacapture-streams/MediaStream-MediaElement-firstframe.https.html
+++ b/tests/wpt/web-platform-tests/mediacapture-streams/MediaStream-MediaElement-firstframe.https.html
@@ -38,9 +38,12 @@ <h1 class="instructions">Description</h1>
     promise,
     wait(time).then(() => Promise.reject(new Error(msg)))
   ]);
-  const unexpected = e => { throw new Error(`Got unexpected event ${e.name}`); };
+  const unexpected = e => assert_unreached(`Got unexpected event ${e.type}`);
   const stream = await navigator.mediaDevices.getUserMedia({video: true});
-  t.add_cleanup(() => stream.getTracks().forEach(track => track.stop()));
+  t.add_cleanup(() => {
+    vid.ondurationchange = null;
+    stream.getTracks().forEach(track => track.stop())
+  });
   vid.srcObject = stream;
 
   vid.onloadstart = unexpected;
diff --git a/tests/wpt/web-platform-tests/mediacapture-streams/MediaStream-MediaElement-srcObject.https.html b/tests/wpt/web-platform-tests/mediacapture-streams/MediaStream-MediaElement-srcObject.https.html
index 4b9a3c8246d0..3b16006e0f52 100644
--- a/tests/wpt/web-platform-tests/mediacapture-streams/MediaStream-MediaElement-srcObject.https.html
+++ b/tests/wpt/web-platform-tests/mediacapture-streams/MediaStream-MediaElement-srcObject.https.html
@@ -22,52 +22,247 @@ <h1 class="instructions">Description</h1>
 const vid = document.getElementById("vid");
 
 promise_test(async t => {
-  const wait = ms => new Promise(r => t.step_timeout(r, ms));
-  const timeout = (promise, time, msg) =>
-    Promise.race([promise, wait(time).then(() => Promise.reject(new Error(msg)))]);
+  const stream = await navigator.mediaDevices.getUserMedia({video: true});
+  t.add_cleanup(() => {
+    vid.srcObject = null;
+    stream.getTracks().forEach(track => track.stop());
+  });
+  vid.srcObject = stream;
+}, "Tests that a MediaStream can be assigned to a video element with srcObject");
 
-  const stream = await timeout(navigator.mediaDevices.getUserMedia({video: true}), 10000, "getUserMedia timeout");
-  t.add_cleanup(() => stream.getTracks().forEach(track => track.stop()));
-  vid.defaultPlaybackRate = 0.4;
-  vid.playbackRate = 0.4;
-  vid.preload = "metadata";
+promise_test(async t => {
+  const stream = await navigator.mediaDevices.getUserMedia({video: true});
+  t.add_cleanup(() => {
+    vid.srcObject = null;
+    stream.getTracks().forEach(track => track.stop());
+  });
   vid.srcObject = stream;
-  vid.onratechange = t.unreached_func('ratechange event must not be fired');
-  vid.play();
+
   assert_true(!vid.seeking, "A MediaStream is not seekable");
   assert_equals(vid.seekable.length, 0, "A MediaStream is not seekable");
+}, "Tests that a MediaStream assigned to a video element is not seekable");
+
+promise_test(async t => {
+  const stream = await navigator.mediaDevices.getUserMedia({video: true});
+  t.add_cleanup(() => {
+    vid.srcObject = null;
+    stream.getTracks().forEach(track => track.stop());
+  });
+  vid.srcObject = stream;
+
+  assert_equals(vid.readyState, vid.HAVE_NOTHING,
+    "readyState is HAVE_NOTHING initially");
+  await new Promise(r => vid.onloadeddata = r);
+  assert_equals(vid.readyState, vid.HAVE_ENOUGH_DATA,
+    "Upon having loaded a media stream, the UA sets readyState to HAVE_ENOUGH_DATA");
+}, "Tests that a MediaStream assigned to a video element is in readyState HAVE_NOTHING initially");
+
+promise_test(async t => {
+  const stream = await navigator.mediaDevices.getUserMedia({video: true});
+  t.add_cleanup(() => {
+    vid.srcObject = null;
+    stream.getTracks().forEach(track => track.stop());
+  });
+  vid.srcObject = stream;
+
+  assert_equals(vid.duration, NaN,
+    "A MediaStream does not have any duration initially.");
+  await new Promise(r => vid.ondurationchange = r);
+  assert_equals(vid.duration, Infinity,
+    "A loaded MediaStream does not have a pre-defined duration.");
+
+  vid.play();
+  await new Promise(r => vid.ontimeupdate = r);
+  for (const t of stream.getTracks()) {
+    t.stop();
+  }
+
+  await new Promise(r => vid.ondurationchange = r);
+  assert_equals(vid.duration, vid.currentTime,
+    "After ending playback, duration gets set to currentTime");
+}, "Tests that a MediaStream assigned to a video element has expected duration");
+
+promise_test(async t => {
+  const stream = await navigator.mediaDevices.getUserMedia({video: true});
+  t.add_cleanup(() => {
+    vid.srcObject = null;
+    stream.getTracks().forEach(track => track.stop());
+  });
+
+  vid.preload = "metadata";
+  vid.srcObject = stream;
+
+  assert_equals(vid.buffered.length, 0,
+    "A MediaStream cannot be preloaded. Therefore, there are no buffered timeranges");
+  assert_equals(vid.preload, "none", "preload must always be none");
+  vid.preload = "auto";
+  assert_equals(vid.preload, "none", "Setting preload must be ignored");
+
+  await new Promise(r => vid.onloadeddata = r);
+  assert_equals(vid.buffered.length, 0,
+    "A MediaStream cannot be preloaded. Therefore, there are no buffered timeranges");
+
+  vid.srcObject = null;
+
+  assert_equals(vid.preload, "metadata",
+    "The preload attribute returns the value it had before using a MediaStream");
+}, "Tests that a video element with a MediaStream assigned is not preloaded");
+
+promise_test(async t => {
+  const stream = await navigator.mediaDevices.getUserMedia({video: true});
+  t.add_cleanup(() => {
+    vid.srcObject = null;
+    stream.getTracks().forEach(track => track.stop());
+  });
+
+  vid.defaultPlaybackRate = 0.3;
+  vid.playbackRate = 0.3;
+  vid.onratechange = t.unreached_func("ratechange event must not be fired");
+  vid.srcObject = stream;
+
   assert_equals(vid.defaultPlaybackRate, 1, "playback rate is always 1");
   vid.defaultPlaybackRate = 0.5;
-  assert_equals(vid.defaultPlaybackRate, 1, "Setting defaultPlaybackRate must be ignored");
+  assert_equals(vid.defaultPlaybackRate, 1,
+    "Setting defaultPlaybackRate must be ignored");
+
   assert_equals(vid.playbackRate, 1, "playback rate is always 1");
   vid.playbackRate = 0.5;
   assert_equals(vid.playbackRate, 1, "Setting playbackRate must be ignored");
-  assert_equals(vid.buffered.length, 0, "A MediaStream cannot be preloaded.  Therefore, there is no buffered timeranges");
-  assert_equals(vid.readyState, vid.HAVE_NOTHING, "readyState is HAVE_NOTHING initially");
-  assert_equals(vid.duration, NaN, "A MediaStream does not have any duration initially.");
-  assert_equals(vid.preload, "none", "preload must always be none");
-  vid.preload = "metadata";
-  assert_equals(vid.preload, "none", "Setting preload must be ignored");
 
-  const haveLoadedData = new Promise(r => vid.addEventListener("loadeddata", r, {once: true}));
+  vid.srcObject = null;
+  assert_equals(vid.defaultPlaybackRate, 0.3,
+    "The defaultPlaybackRate attribute returns the value it had before using a MediaStream");
+  assert_equals(vid.playbackRate, 0.3,
+    "The playbackRate attribute is set to the value of the defaultPlaybackRate attribute when unsetting srcObject");
+
+  // Check that there's no ratechange event
+  await new Promise(r => t.step_timeout(r, 100));
+}, "Tests that a video element with a MediaStream assigned ignores playbackRate attributes (defaultPlaybackRate is identical)");
+
+promise_test(async t => {
+  const stream = await navigator.mediaDevices.getUserMedia({video: true});
+  t.add_cleanup(() => {
+    vid.srcObject = null;
+    stream.getTracks().forEach(track => track.stop());
+  });
+
+  vid.defaultPlaybackRate = 0.3;
+  vid.playbackRate = 0.4;
+  vid.onratechange = t.unreached_func("ratechange event must not be fired");
+  vid.srcObject = stream;
+
+  assert_equals(vid.defaultPlaybackRate, 1, "playback rate is always 1");
+  vid.defaultPlaybackRate = 0.5;
+  assert_equals(vid.defaultPlaybackRate, 1,
+    "Setting defaultPlaybackRate must be ignored");
+
+  assert_equals(vid.playbackRate, 1, "playback rate is always 1");
+  vid.playbackRate = 0.5;
+  assert_equals(vid.playbackRate, 1, "Setting playbackRate must be ignored");
+
+  vid.srcObject = null;
+  assert_equals(vid.defaultPlaybackRate, 0.3,
+    "The defaultPlaybackRate attribute returns the value it had before using a MediaStream");
+  assert_equals(vid.playbackRate, 0.3,
+    "The playbackRate attribute is set to the value of the defaultPlaybackRate attribute when unsetting srcObject (and fires ratechange)");
+  await new Promise(r => vid.onratechange = r);
+}, "Tests that a video element with a MediaStream assigned ignores playbackRate attributes (defaultPlaybackRate is different)");
+
+promise_test(async t => {
+  const stream = await navigator.mediaDevices.getUserMedia({video: true});
+  t.add_cleanup(() => {
+    vid.srcObject = null;
+    stream.getTracks().forEach(track => track.stop());
+  });
+  vid.srcObject = stream;
+  await new Promise(r => vid.oncanplay = r);
+  vid.play();
+  await new Promise(r => vid.ontimeupdate = r);
+  assert_greater_than(vid.currentTime, 0,
+    "currentTime is greater than 0 after first timeupdate");
 
-  await new Promise(r => vid.addEventListener("timeupdate", r, {once: true}));
-  assert_equals(vid.played.length, 1, "A MediaStream's timeline always consists of a single range");
-  assert_equals(vid.played.start(0), 0, "A MediaStream's timeline always starts at zero");
-  assert_equals(vid.played.end(0), vid.currentTime, "A MediaStream's end MUST return the last known currentTime, says mediacapture-main");
-  assert_equals(vid.duration, Infinity, "A MediaStream does not have a pre-defined duration. ");
+  assert_equals(vid.played.length, 1,
+    "A MediaStream's timeline always consists of a single range");
+  assert_equals(vid.played.start(0), 0,
+    "A MediaStream's timeline always starts at zero");
+  assert_equals(vid.played.end(0), vid.currentTime,
+    "A MediaStream's end MUST return the last known currentTime");
 
   const time = vid.currentTime;
   vid.currentTime = 0;
-  assert_equals(vid.currentTime, time, "The UA MUST ignore attempts to set the currentTime attribute");
+  assert_equals(vid.currentTime, time,
+    "The UA MUST ignore attempts to set the currentTime attribute");
+}, "Tests that a media element with an assigned MediaStream reports the played attribute as expected");
 
-  await haveLoadedData;
-  assert_equals(vid.readyState, vid.HAVE_ENOUGH_DATA, "Upon having loaded a media stream, the UA sets readyState to HAVE_ENOUGH_DATA");
-  assert_equals(vid.duration, Infinity, "A MediaStream does not have a pre-defined duration.");
+promise_test(async t => {
+  const stream = await navigator.mediaDevices.getUserMedia({video: true});
+  t.add_cleanup(() => {
+    vid.srcObject = null;
+    stream.getTracks().forEach(track => track.stop());
+  });
+  vid.srcObject = stream;
 
-  // TODO add test that duration must be set to currentTime
-  // when mediastream is destroyed
-}, "Tests that a MediaStream can be assigned to a video element with srcObject");
+  assert_equals(vid.currentTime, 0, "The initial value is 0");
+  vid.currentTime = 42;
+  assert_equals(vid.currentTime, 0,
+    "The UA MUST ignore attempts to set the currentTime attribute (default playback start position)");
+
+  await new Promise(r => vid.onloadeddata = r);
+  assert_equals(vid.currentTime, 0, "The initial value is 0");
+  vid.currentTime = 42;
+  assert_equals(vid.currentTime, 0,
+    "The UA MUST ignore attempts to set the currentTime attribute (official playback position)");
+
+  vid.play();
+  await new Promise(r => vid.ontimeupdate = r);
+  assert_greater_than(vid.currentTime, 0,
+    "currentTime is greater than 0 after first timeupdate");
+
+  const lastTime = vid.currentTime;
+  vid.currentTime = 0;
+  assert_equals(vid.currentTime, lastTime,
+    "The UA MUST ignore attempts to set the currentTime attribute (restart)");
+
+  for(const t of stream.getTracks()) {
+    t.stop();
+  }
+  await new Promise(r => vid.onended = r);
+  assert_greater_than_equal(vid.currentTime, lastTime,
+    "currentTime advanced after stopping");
+}, "Tests that a media element with an assigned MediaStream reports the currentTime attribute as expected");
+
+
+promise_test(async t => {
+  const stream = await navigator.mediaDevices.getUserMedia({video: true});
+  t.add_cleanup(() => {
+    vid.srcObject = null;
+    stream.getTracks().forEach(track => track.stop());
+  });
+  assert_equals(vid.loop, false, "loop is false by default");
+  vid.srcObject = stream;
+
+  vid.loop = true;
+  assert_equals(vid.loop, true,
+    "loop can be changed when assigned a MediaStream");
+
+  await new Promise(r => vid.onloadeddata = r);
+  vid.loop = false;
+  assert_equals(vid.loop, false,
+    "loop can be changed when having loaded a MediaStream");
+
+  vid.play();
+  await new Promise(r => vid.ontimeupdate = r);
+  vid.loop = true;
+  assert_equals(vid.loop, true,
+    "loop can be changed when playing a MediaStream");
+
+  for(const t of stream.getTracks()) {
+    t.stop();
+  }
+  // If loop is ignored, we get "ended",
+  // otherwise the media element sets currentTime to 0 without ending.
+  await new Promise(r => vid.onended = r);
+}, "Tests that the loop attribute has no effect on a media element with an assigned MediaStream");
 </script>
 </body>
 </html>
diff --git a/tests/wpt/web-platform-tests/mediasession/setactionhandler.html b/tests/wpt/web-platform-tests/mediasession/setactionhandler.html
index dc7c3359e122..06d145b37d16 100644
--- a/tests/wpt/web-platform-tests/mediasession/setactionhandler.html
+++ b/tests/wpt/web-platform-tests/mediasession/setactionhandler.html
@@ -11,6 +11,7 @@
   window.navigator.mediaSession.setActionHandler("nexttrack", null);
   window.navigator.mediaSession.setActionHandler("seekbackward", null);
   window.navigator.mediaSession.setActionHandler("seekforward", null);
+  window.navigator.mediaSession.setActionHandler("stop", null);
 }, "Test that setActionHandler() can be executed for supported actions");
 
 test(function(t) {
diff --git a/tests/wpt/web-platform-tests/service-workers/service-worker/fetch-event-async-respond-with.https.html b/tests/wpt/web-platform-tests/service-workers/service-worker/fetch-event-async-respond-with.https.html
index ae64fcb9a544..d9147f85494c 100644
--- a/tests/wpt/web-platform-tests/service-workers/service-worker/fetch-event-async-respond-with.https.html
+++ b/tests/wpt/web-platform-tests/service-workers/service-worker/fetch-event-async-respond-with.https.html
@@ -44,10 +44,12 @@
   assert_equals(response, 'messageHandlerInitialized');
 
   // Start a fetch.
-  frame.contentWindow.fetch(url);
+  const fetchPromise = frame.contentWindow.fetch(url);
 
   // Receive the test result from the service worker.
-  return wait_for_message();
+  const result = wait_for_message();
+  await fetchPromise.then(()=> {}, () => {});
+  return result;
 };
 
 promise_test(async (t) => {
diff --git a/tests/wpt/web-platform-tests/svg/render/reftests/change-sync-for-nested-use-ref.html b/tests/wpt/web-platform-tests/svg/render/reftests/change-sync-for-nested-use-ref.html
new file mode 100644
index 000000000000..e52fa18d3f30
--- /dev/null
+++ b/tests/wpt/web-platform-tests/svg/render/reftests/change-sync-for-nested-use-ref.html
@@ -0,0 +1,16 @@
+<!doctype html>
+<html>
+<title>Change sync for nested use</title>
+<svg width="400" height="500">
+  <rect id="r1" width="40" height="40" style="fill:navy" />
+  <rect id="r2" x="50" y="50" width="40" height="40" style="fill:purple" />
+  <g id="g1">
+    <use id="u1" x="120" href="#r1" />
+    <use id="u2" x="120" href="#r2" />
+    <rect x="120" y="120" width="50" height="50" style="fill:skyblue" />
+  </g>
+  <use id="u3" x="120" href="#g1" />
+  <use id="u4" y="170" href="#u2" />
+  <use id="u5" x="-30" y="220" href="#u2" />
+</svg>
+</html>
diff --git a/tests/wpt/web-platform-tests/svg/render/reftests/change-sync-for-nested-use.html b/tests/wpt/web-platform-tests/svg/render/reftests/change-sync-for-nested-use.html
new file mode 100644
index 000000000000..9a6e13435094
--- /dev/null
+++ b/tests/wpt/web-platform-tests/svg/render/reftests/change-sync-for-nested-use.html
@@ -0,0 +1,30 @@
+<!doctype html>
+<html class="reftest-wait">
+<title>Change sync for nested use</title>
+<link rel="match" href="change-sync-for-nested-use-ref.html">
+<svg width="400" height="500" onload="main()">
+  <rect id="r1" width="40" height="40" style="fill:red" />
+  <rect id="r2" x="50" y="50" width="40" height="40" style="fill:gray" />
+  <g id="g1">
+    <use id="u1" x="120" href="#r1" />
+    <use id="u2" x="120" href="#r2" />
+    <rect x="120" y="120" width="50" height="50" style="fill:skyblue" />
+  </g>
+  <use id="u3" x="120" href="#g1" />
+  <use id="u4" y="170" href="#u2" />
+  <use id="u5" x="-30" y="220" href="#u2" />
+</svg>
+
+<script>
+  function main() {
+    let r1 = document.getElementById("r1"),
+        r2 = document.getElementById("r2");
+
+    requestAnimationFrame(() => requestAnimationFrame(() => {
+      r1.style.fill = "navy";
+      r2.style.fill = "purple";
+      document.documentElement.removeAttribute("class");
+    }));
+  };
+</script>
+</html>
diff --git a/tests/wpt/web-platform-tests/tools/lint/lint.py b/tests/wpt/web-platform-tests/tools/lint/lint.py
index 6a71dc860feb..062c6a42d0f9 100644
--- a/tests/wpt/web-platform-tests/tools/lint/lint.py
+++ b/tests/wpt/web-platform-tests/tools/lint/lint.py
@@ -146,6 +146,13 @@ def check_path_length(repo_root, path):
     return []
 
 
+def check_file_type(repo_root, path):
+    # type: (str, str) -> List[rules.Error]
+    if os.path.islink(path):
+        return [rules.FileType.error(path, (path, "symlink"))]
+    return []
+
+
 def check_worker_collision(repo_root, path):
     # type: (str, str) -> List[rules.Error]
     endings = [(".any.html", ".any.js"),
@@ -907,7 +914,8 @@ def process_errors(errors):
                 logger.info(line)
     return sum(itervalues(error_count))
 
-path_lints = [check_path_length, check_worker_collision, check_ahem_copy, check_gitignore_file]
+path_lints = [check_file_type, check_path_length, check_worker_collision, check_ahem_copy,
+              check_gitignore_file]
 all_paths_lints = [check_css_globally_unique]
 file_lints = [check_regexp_line, check_parsed, check_python_ast, check_script_metadata]
 
diff --git a/tests/wpt/web-platform-tests/tools/lint/rules.py b/tests/wpt/web-platform-tests/tools/lint/rules.py
index 685bac3474ec..9b78f3495b22 100644
--- a/tests/wpt/web-platform-tests/tools/lint/rules.py
+++ b/tests/wpt/web-platform-tests/tools/lint/rules.py
@@ -57,6 +57,11 @@ class PathLength(Rule):
     description = "/%s longer than maximum path length (%d > 150)"
 
 
+class FileType(Rule):
+    name = "FILE TYPE"
+    description = "/%s is an unsupported file type (%s)"
+
+
 class WorkerCollision(Rule):
     name = "WORKER COLLISION"
     description = ("path ends with %s which collides with generated tests "
diff --git a/tests/wpt/web-platform-tests/tools/lint/tests/test_path_lints.py b/tests/wpt/web-platform-tests/tools/lint/tests/test_path_lints.py
index 9f6f49e14a12..558b0ed4f648 100644
--- a/tests/wpt/web-platform-tests/tools/lint/tests/test_path_lints.py
+++ b/tests/wpt/web-platform-tests/tools/lint/tests/test_path_lints.py
@@ -1,5 +1,6 @@
 from __future__ import unicode_literals
 
+import mock
 import os
 
 from ..lint import check_path
@@ -32,7 +33,7 @@ def test_forbidden_path_length():
                                                    (".any.worker.html", ".any.js"),
                                                    (".any.html", ".any.js")])
 def test_forbidden_path_endings(path_ending, generated):
-    path = "/test/test" + path_ending
+    path = "test/test" + path_ending
 
     message = ("path ends with %s which collides with generated tests from %s files" %
                (path_ending, generated))
@@ -42,6 +43,17 @@ def test_forbidden_path_endings(path_ending, generated):
     assert errors == [("WORKER COLLISION", message, path, None)]
 
 
+def test_file_type():
+    path = "test/test"
+
+    message = "/%s is an unsupported file type (symlink)" % (path,)
+
+    with mock.patch("os.path.islink", returnvalue=True):
+        errors = check_path("/foo/", path)
+
+    assert errors == [("FILE TYPE", message, path, None)]
+
+
 @pytest.mark.parametrize("path", ["ahem.ttf",
                                   "Ahem.ttf",
                                   "ahem.tTf",
diff --git a/tests/wpt/web-platform-tests/tools/wptrunner/setup.py b/tests/wpt/web-platform-tests/tools/wptrunner/setup.py
index 0a16aa537b33..ab96bd10357c 100644
--- a/tests/wpt/web-platform-tests/tools/wptrunner/setup.py
+++ b/tests/wpt/web-platform-tests/tools/wptrunner/setup.py
@@ -57,7 +57,6 @@
                                   "prefs/*"]},
       include_package_data=True,
       data_files=[("requirements", requirements_files)],
-      install_requires=deps
       )
 
 if "install" in sys.argv:
diff --git a/tests/wpt/web-platform-tests/trusted-types/Element-insertAdjacentText.tentative.html b/tests/wpt/web-platform-tests/trusted-types/Element-insertAdjacentText.tentative.html
new file mode 100644
index 000000000000..f6221362c17d
--- /dev/null
+++ b/tests/wpt/web-platform-tests/trusted-types/Element-insertAdjacentText.tentative.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="support/helper.sub.js"></script>
+<body>
+<div id="container"></div>
+<script>
+  var container = document.querySelector('#container');
+
+  test(t => {
+    let p = createHTML_policy(window, 1);
+    let html = p.createHTML(INPUTS.HTML);
+    let before = 'before';
+    let after = 'after';
+    let htmlBefore = p.createHTML(before);
+    let htmlAfter = p.createHTML(after);
+
+    var d = document.createElement('div');
+    container.appendChild(d);
+
+    d.insertAdjacentHTML('beforebegin', html);
+    assert_equals(d.previousSibling.nodeType, Node.TEXT_NODE);
+    assert_equals(d.previousSibling.data, RESULTS.HTML);
+
+    d.insertAdjacentHTML('afterbegin', htmlBefore);
+    d.insertAdjacentHTML('beforeend', htmlAfter);
+    assert_equals(d.innerHTML, before + after);
+
+    d.insertAdjacentHTML('afterend', html);
+    assert_equals(d.nextSibling.nodeType, Node.TEXT_NODE);
+    assert_equals(d.nextSibling.data, RESULTS.HTML);
+
+    while (container.firstChild)
+      container.firstChild.remove();
+  }, "insertAdjacentHTML with html assigned via policy (successful HTML transformation).");
+</script>
+
diff --git a/tests/wpt/web-platform-tests/trusted-types/block-text-node-insertion-into-script-element.tentative.html b/tests/wpt/web-platform-tests/trusted-types/block-text-node-insertion-into-script-element.tentative.html
new file mode 100644
index 000000000000..a6aa061f7307
--- /dev/null
+++ b/tests/wpt/web-platform-tests/trusted-types/block-text-node-insertion-into-script-element.tentative.html
@@ -0,0 +1,67 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="support/helper.sub.js"></script>
+  <meta http-equiv="Content-Security-Policy" content="trusted-types *">
+</head>
+<body>
+<div id="container"></div>
+<script>
+  var container = document.querySelector("#container");
+
+  // Regression tests for 'Bypass via insertAdjacentText', reported at
+  // https://github.com/WICG/trusted-types/issues/133
+
+  // Original report:
+  test(t => {
+    // Setup: Create a <script> element with a <p> child.
+    let s = document.createElement("script");
+    let p = document.createElement("p");
+    p.textContent = "hello('world');";
+    s.appendChild(p);
+    container.appendChild(s);
+
+    // Sanity check: The <p> content doesn't count as source text.
+    assert_equals(s.text, "");
+
+    // Try to insertAdjacentText into the <script>, starting from the <p>
+    try {
+      p.insertAdjacentText("beforebegin", "hello('before');");
+    } catch (err) { }
+    assert_equals(s.text, "");
+    try {
+      p.insertAdjacentText("afterend", "hello('after');");
+    } catch (err) { }
+    assert_equals(s.text, "");
+  }, "Regression test: Bypass via insertAdjacentText, initial comment");
+
+  // Variant: Create a <script> element and create & insert a text node. Then
+  // insert it into the document container to make it live.
+  test(t => {
+    // Setup: Create a <script> element, and insert text via a text node.
+    let s = document.createElement("script");
+    let text = document.createTextNode("alert('hello');");
+    assert_throws(new TypeError(),
+                  _ => { s.appendChild(text); },
+                  "We should not be able to modify <script>.");
+    container.appendChild(s);
+  }, "Regression test: Bypass via appendChild into off-document script element");
+
+  // Variant: Create a <script> element and insert it into the document. Then
+  // create a text node and insert it into the live <script> element.
+  test(t => {
+    // Setup: Create a <script> element, insert it into the doc, and then create
+    // and insert text via a text node.
+    let s = document.createElement("script");
+    container.appendChild(s);
+    let text = document.createTextNode("alert('hello');");
+    assert_throws(new TypeError(),
+                  _ => { s.appendChild(text); },
+                  "We should not be able to modify <script>.");
+  }, "Regression test: Bypass via appendChild into live script element");
+</script>
+</body>
+</html>
+
diff --git a/tests/wpt/web-platform-tests/web-nfc/NFCErrorEvent_constructor.https.html b/tests/wpt/web-platform-tests/web-nfc/NFCErrorEvent_constructor.https.html
index 8a08fe0a70ed..1cc9ce160be4 100644
--- a/tests/wpt/web-platform-tests/web-nfc/NFCErrorEvent_constructor.https.html
+++ b/tests/wpt/web-platform-tests/web-nfc/NFCErrorEvent_constructor.https.html
@@ -8,4 +8,13 @@
     assert_equals(NFCErrorEvent.length, 2);
     assert_throws(new TypeError, () => new NFCErrorEvent('error'));
   }, 'NFCErrorEvent constructor without init dict');
+
+  test(() => {
+    assert_throws(new TypeError, () => new NFCErrorEvent('error', { error : null }));
+  }, 'NFCErrorEvent constructor with a null that is not of type DOMException');
+
+  test(() => {
+    const event = new NFCErrorEvent('error', { error : new DOMException() });
+    assert_true(event.error instanceof DOMException);
+  }, 'NFCErrorEvent constructor with a valid DOMException');
 </script>
diff --git a/tests/wpt/web-platform-tests/web-nfc/NFCReadingEvent_constructor.https.html b/tests/wpt/web-platform-tests/web-nfc/NFCReadingEvent_constructor.https.html
index 6cfcc0d3bdda..460e92b2508b 100644
--- a/tests/wpt/web-platform-tests/web-nfc/NFCReadingEvent_constructor.https.html
+++ b/tests/wpt/web-platform-tests/web-nfc/NFCReadingEvent_constructor.https.html
@@ -3,9 +3,32 @@
 <link rel="help" href="https://w3c.github.io/web-nfc/#dom-nfcreadingevent">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
+<script src="resources/nfc_help.js"></script>
 <script>
+
+  const non_strings = [
+    123,
+    {},
+    true,
+    Symbol(),
+    () => {},
+    self
+  ]
+
   test(() => {
     assert_equals(NFCReadingEvent.length, 2);
     assert_throws(new TypeError, () => new NFCReadingEvent('message'));
   }, 'NFCReadingEvent constructor without init dict');
+
+  test(() => {
+    assert_equals(NFCReadingEvent.length, 2);
+    const message = createMessage([createJsonRecord(test_json_data)]);
+    non_strings.forEach(invalid_serialNumber => {
+      assert_throws(new TypeError, () => new NFCReadingEvent(
+        'message',
+        {invalid_serialNumber, message}
+      ));
+    });
+  }, 'NFCReadingEvent constructor with non-string serialNumber');
+
 </script>
diff --git a/tests/wpt/web-platform-tests/web-nfc/NFCWriter_push.https.html b/tests/wpt/web-platform-tests/web-nfc/NFCWriter_push.https.html
index 5badeb408385..b1559b30fec5 100644
--- a/tests/wpt/web-platform-tests/web-nfc/NFCWriter_push.https.html
+++ b/tests/wpt/web-platform-tests/web-nfc/NFCWriter_push.https.html
@@ -233,17 +233,4 @@
   return Promise.all(promises);
 }, "Test that promise is rejected with TypeError if NDEFMessageSource contains non-string url.");
 
-promise_test(t => {
-  const writer = new NFCWriter();
-  const promises = [];
-  non_strings.forEach(invalid_serialNumber => {
-    promises.push(
-      promise_rejects(t, new TypeError(), writer.push({
-        serialNumber: invalid_serialNumber,
-        records: [{ recordType: "text", data: 'Hello World' }]
-      })));
-  });
-  return Promise.all(promises);
-}, "Test that promise is rejected with TypeError if NDEFMessageSource contains non-string serialNumber.");
-
 </script>
diff --git a/tests/wpt/web-platform-tests/web-nfc/idlharness.https.window.js b/tests/wpt/web-platform-tests/web-nfc/idlharness.https.window.js
index ab0d6cd191a5..c19458aed83f 100644
--- a/tests/wpt/web-platform-tests/web-nfc/idlharness.https.window.js
+++ b/tests/wpt/web-platform-tests/web-nfc/idlharness.https.window.js
@@ -14,7 +14,7 @@ const message = {
 
 idl_test(
   ['web-nfc'],
-  ['html', 'dom'],
+  ['html', 'dom', 'WebIDL'],
   idl_array => {
     idl_array.add_objects({
       NFCWriter: ['new NFCWriter();'],
diff --git a/tests/wpt/web-platform-tests/webrtc/idlharness.https.window.js b/tests/wpt/web-platform-tests/webrtc/idlharness.https.window.js
index 66abc25b0840..85fc7a68b9df 100644
--- a/tests/wpt/web-platform-tests/webrtc/idlharness.https.window.js
+++ b/tests/wpt/web-platform-tests/webrtc/idlharness.https.window.js
@@ -102,7 +102,7 @@ function asyncInit() {
 
 idl_test(
   ['webrtc'],
-  ['mediacapture-streams', 'dom', 'html'],
+  ['WebIDL', 'mediacapture-streams', 'dom', 'html'],
   async idlArray => {
     idlArray.add_objects({
       RTCPeerConnection: [`new RTCPeerConnection()`],
diff --git a/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/2_cues_overlapping_completely_move_up-ref.html b/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/2_cues_overlapping_completely_move_up-ref.html
index 4be9d6a5c1ca..17222bdc7b3c 100644
--- a/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/2_cues_overlapping_completely_move_up-ref.html
+++ b/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/2_cues_overlapping_completely_move_up-ref.html
@@ -11,26 +11,22 @@
     position: relative;
     font-size: 9px;
 }
-#cue1 {
+.cue {
     position: absolute;
-    top: 50%;
+    bottom: 0;
     left: 0;
     right: 0;
-    margin-top: -4.5px;
-    text-align: center
+    text-align: center;
 }
-#cue2 {
-    position: absolute;
-    top: 50%;
-    left: 0;
-    right: 0;
-    margin-top: -13.5px;
-    text-align: center
-}
-.cue > span {
+.cueText {
     font-family: Ahem, sans-serif;
     background: rgba(0,0,0,0.8);
     color: green;
 }
 </style>
-<div class="video"><span class="cue" id="cue1"><span>This is a test subtitle</span></span><span class="cue" id="cue2"><span>This is another test subtitle</span></span></div>
+<div class="video">
+    <span class="cue">
+        <div><span class="cueText">This is another test subtitle</span></div>
+        <div><span class="cueText">This is a test subtitle</span></div>
+    </span>
+</div>
diff --git a/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/2_cues_overlapping_partially_move_up-ref.html b/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/2_cues_overlapping_partially_move_up-ref.html
index d6117b325714..22a711af6878 100644
--- a/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/2_cues_overlapping_partially_move_up-ref.html
+++ b/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/2_cues_overlapping_partially_move_up-ref.html
@@ -11,26 +11,26 @@
     position: relative;
     font-size: 9px;
 }
-#cue1 {
+.cue {
     position: absolute;
-    top: 50%;
+    bottom: 0;
     left: 0;
     right: 0;
-    margin-top: -4.5px;
-    text-align: center
+    text-align: center;
 }
-#cue2 {
-    position: absolute;
-    top: 50%;
-    left: 0;
-    right: 0;
-    margin-top: -13.5px;
-    text-align: center
-}
-.cue > span {
+.cueText {
     font-family: Ahem, sans-serif;
     background: rgba(0,0,0,0.8);
     color: green;
 }
+.cueTextGoingUp {
+    position: relative;
+    top: -1.8px; /* 1% height of video's height */
+}
 </style>
-<div class="video"><span class="cue" id="cue1"><span>This is a test subtitle</span></span><span class="cue" id="cue2"><span>This is another test subtitle</span></span></div>
+<div class="video">
+    <span class="cue">
+        <div><span class="cueText cueTextGoingUp">This is another test subtitle</span></div>
+        <div><span class="cueText">This is a test subtitle</span></div>
+    </span>
+</div>
diff --git a/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/align_center_position_gt_50-ref.html b/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/align_center_position_gt_50-ref.html
index 9f79bf8e3bf6..c37ae7a7dfad 100644
--- a/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/align_center_position_gt_50-ref.html
+++ b/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/align_center_position_gt_50-ref.html
@@ -14,7 +14,7 @@
 .cue {
     position: absolute;
     bottom: 0;
-    right: 23px;
+    right: 0px;
     width: 64px;
     text-align: center;
 }
@@ -24,4 +24,4 @@
     color: green;
 }
 </style>
-<div class=video><span class=cue><span>Aweso<br>me!!!</span></span></div>
+<div class=video><span class=cue><span>Awesome!!!</span></span></div>
diff --git a/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/align_center_position_lt_50-ref.html b/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/align_center_position_lt_50-ref.html
index cc52e2db7332..108495e4b00e 100644
--- a/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/align_center_position_lt_50-ref.html
+++ b/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/align_center_position_lt_50-ref.html
@@ -14,7 +14,7 @@
 .cue {
     position: absolute;
     bottom: 0;
-    left: 23px;
+    left: 0px;
     right: 0;
     width: 64px;
     text-align: center
@@ -25,4 +25,4 @@
     color: green;
 }
 </style>
-<div class=video><span class=cue><span>Awesome<br>!!!</span></span></div>
+<div class=video><span class=cue><span>Awesome!!!</span></span></div>
diff --git a/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/align_center_position_lt_50_size_gt_maximum_size-ref.html b/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/align_center_position_lt_50_size_gt_maximum_size-ref.html
index 02a7ae458494..296369332cf8 100644
--- a/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/align_center_position_lt_50_size_gt_maximum_size-ref.html
+++ b/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/align_center_position_lt_50_size_gt_maximum_size-ref.html
@@ -14,7 +14,7 @@
 .cue {
     position: absolute;
     bottom: 0;
-    left: 23px;
+    left: 0px;
     right: 0;
     width: 64px;
     text-align: center;
@@ -25,4 +25,4 @@
     color: green;
 }
 </style>
-<div class=video><span class=cue><span>Aweso<br>me!!!</span></span></div>
+<div class=video><span class=cue><span>Awesome!!!</span></span></div>
diff --git a/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/align_center_wrapped-ref.html b/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/align_center_wrapped-ref.html
index d67f0a8c04ae..55aed284b7a5 100644
--- a/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/align_center_wrapped-ref.html
+++ b/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/align_center_wrapped-ref.html
@@ -24,4 +24,4 @@
     color: green;
 }
 </style>
-<div class=video><span class=cue><span>This is a test subtitle that <br>most likely will span over <br>several rows since it is a pretty <br>long cue with a lot of text.</span></span></div>
+<div class=video><span class=cue><span>This is a test subtitle that most likely will span over several rows since it is a pretty long cue with a lot of text.</span></span></div>
diff --git a/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/align_end_wrapped-ref.html b/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/align_end_wrapped-ref.html
index 70b32cfc9bad..eee75f138fde 100644
--- a/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/align_end_wrapped-ref.html
+++ b/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/align_end_wrapped-ref.html
@@ -24,4 +24,4 @@
     color: green;
 }
 </style>
-<div class=video><span class=cue><span>This is a test <br>subtitle that <br>most likely <br>will span over <br>several rows <br>since it is a <br>pretty long <br>cue with a <br>lot of text.</span></span></div>
+<div class=video><span class=cue><span>This is a test subtitle that most likely will span over several rows since it is a pretty long cue with a lot of text.</span></span></div>
diff --git a/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/align_start_wrapped-ref.html b/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/align_start_wrapped-ref.html
index d3c28fc36194..45cb287e2f6c 100644
--- a/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/align_start_wrapped-ref.html
+++ b/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/align_start_wrapped-ref.html
@@ -24,4 +24,4 @@
     color: green;
 }
 </style>
-<div class=video><span class=cue><span>This is a test <br>subtitle that <br>most likely <br>will span over <br>several rows <br>since it is a <br>pretty long <br>cue with a <br>lot of text.</span></span></div>
+<div class=video><span class=cue><span>This is a test subtitle that most likely will span over several rows since it is a pretty long cue with a lot of text.</span></span></div>
diff --git a/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/bidi/start_alignment-ref.html b/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/bidi/start_alignment-ref.html
new file mode 100644
index 000000000000..78ca8979c95a
--- /dev/null
+++ b/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/bidi/start_alignment-ref.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<html class="reftest-wait">
+<title>WebVTT rendering, set align start and the cue contains two lines with different writing directions</title>
+<script src="/common/reftest-wait.js"></script>
+<style>
+html { overflow:hidden }
+body { margin:0 }
+.video {
+    display: inline-block;
+    width: 320px;
+    height: 180px;
+    position: relative;
+    font-size: 9px;
+}
+.cue {
+    position: absolute;
+    top: 0;
+    bottom: 0;
+    left: 0;
+    right: 0;
+    text-align: start;
+    unicode-bidi: plaintext;
+}
+.cueText {
+    font-family: sans-serif;
+    background: rgba(0,0,0,0.8);
+    color: green;
+}
+</style>
+<div class="video">
+    <video width="320" height="180" autoplay onplaying="this.onplaying = null; this.pause(); takeScreenshot();">
+        <source src="/media/white.webm" type="video/webm">
+        <source src="/media/white.mp4" type="video/mp4">
+    </video>
+    <span class="cue">
+        <span class="cueText">Hello!</span><br>
+        <span class="cueText">שלום!</span>
+    </span>
+</div>
+</html>
diff --git a/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/bidi/start_alignment.html b/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/bidi/start_alignment.html
new file mode 100644
index 000000000000..2b6cd76c2010
--- /dev/null
+++ b/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/bidi/start_alignment.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+<title>WebVTT rendering, set align start and the cue contains two lines with different writing directions</title>
+<link rel="match" href="start_alignment-ref.html">
+<style>
+html { overflow:hidden }
+body { margin:0 }
+::cue {
+    font-family: sans-serif;
+    color: green;
+}
+</style>
+<script src="/common/reftest-wait.js"></script>
+<video width="320" height="180" autoplay onplaying="this.onplaying = null; this.pause(); takeScreenshot();">
+    <source src="/media/white.webm" type="video/webm">
+    <source src="/media/white.mp4" type="video/mp4">
+    <track src="../support/start_alignment.vtt" default>
+</video>
+</html>
diff --git a/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/navigate_cue_position-1.html b/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/navigate_cue_position-1.html
index 0139f0c83395..87f3834e3d78 100644
--- a/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/navigate_cue_position-1.html
+++ b/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/navigate_cue_position-1.html
@@ -14,7 +14,7 @@
   color: green;
 }
 </style>
-<video autoplay controls onplaying="this.onplaying = null;
+<video autoplay onplaying="this.onplaying = null;
                            this.pause();
                            this.currentTime = 0;
                            ">
diff --git a/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/navigate_cue_position-ref-1.html b/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/navigate_cue_position-ref-1.html
index fb954a423027..5ee98043ec2d 100644
--- a/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/navigate_cue_position-ref-1.html
+++ b/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/navigate_cue_position-ref-1.html
@@ -17,7 +17,7 @@
 }
 .cue {
     position: absolute;
-    bottom: 50px;
+    bottom: 0;
     left: 0;
     right: 0;
     text-align: center
@@ -28,7 +28,7 @@
     color: green;
 }
 </style>
-<video controls>
+<video>
     <source src="/media/white.webm" type="video/webm">
     <source src="/media/white.mp4" type="video/mp4">
 </video>
diff --git a/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/support/2_cues_overlapping_completely_move_up.vtt b/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/support/2_cues_overlapping_completely_move_up.vtt
index d4a967924821..1ca56e56f6a8 100644
--- a/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/support/2_cues_overlapping_completely_move_up.vtt
+++ b/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/support/2_cues_overlapping_completely_move_up.vtt
@@ -1,7 +1,7 @@
 WEBVTT
 
-00:00:00.000 --> 00:00:05.000 line:50%
+00:00:00.000 --> 00:00:05.000 line:100%
 This is a test subtitle
 
-00:00:01.000 --> 00:00:05.000 line:50%
+00:00:01.000 --> 00:00:05.000 line:100%
 This is another test subtitle
diff --git a/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/support/2_cues_overlapping_partially_move_up.vtt b/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/support/2_cues_overlapping_partially_move_up.vtt
index 6c99ce3b1fe1..7160f3791ee0 100644
--- a/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/support/2_cues_overlapping_partially_move_up.vtt
+++ b/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/support/2_cues_overlapping_partially_move_up.vtt
@@ -1,7 +1,7 @@
 WEBVTT
 
-00:00:00.000 --> 00:00:05.000 line:50%
+00:00:00.000 --> 00:00:05.000 line:100%
 This is a test subtitle
 
-00:00:01.000 --> 00:00:05.000 line:49%
+00:00:01.000 --> 00:00:05.000 line:99%
 This is another test subtitle
diff --git a/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/support/start_alignment.vtt b/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/support/start_alignment.vtt
new file mode 100644
index 000000000000..9a92729381b3
--- /dev/null
+++ b/tests/wpt/web-platform-tests/webvtt/rendering/cues-with-video/processing-model/support/start_alignment.vtt
@@ -0,0 +1,5 @@
+WEBVTT FILE
+
+00:00:00.000 --> 00:00:10.000 align:start line:0
+Hello!
+שלום!