diff --git a/tests/wpt/metadata/MANIFEST.json b/tests/wpt/metadata/MANIFEST.json
index fffdafa6a89b..ca67f6af07f9 100644
--- a/tests/wpt/metadata/MANIFEST.json
+++ b/tests/wpt/metadata/MANIFEST.json
@@ -137677,6 +137677,42 @@
      {}
     ]
    ],
+   "css/css-tables/subpixel-collapsed-borders-001.html": [
+    [
+     "/css/css-tables/subpixel-collapsed-borders-001.html",
+     [
+      [
+       "/css/css-tables/subpixel-collapsed-borders-ref.html",
+       "=="
+      ]
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+   "css/css-tables/subpixel-collapsed-borders-002.html": [
+    [
+     "/css/css-tables/subpixel-collapsed-borders-002.html",
+     [
+      [
+       "/css/css-tables/subpixel-collapsed-borders-ref.html",
+       "=="
+      ]
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+   ],
+   "css/css-tables/subpixel-collapsed-borders-003.html": [
+    [
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+     [
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+       "/css/css-tables/subpixel-collapsed-borders-003-ref.html",
+       "=="
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    "css/css-tables/subpixel-table-cell-height-001.html": [
     [
      "/css/css-tables/subpixel-table-cell-height-001.html",
@@ -193089,6 +193125,18 @@
      {}
     ]
    ],
+   "html/semantics/embedded-content/media-elements/track/track-element/track-cue-rendering-empty-cue.html": [
+    [
+     "/html/semantics/embedded-content/media-elements/track/track-element/track-cue-rendering-empty-cue.html",
+     [
+      [
+       "/html/semantics/embedded-content/media-elements/track/track-element/track-cue-rendering-empty-cue-ref.html",
+       "=="
+      ]
+     ],
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+   ],
    "html/semantics/embedded-content/media-elements/track/track-element/track-cue-rendering-line-doesnt-fit.html": [
     [
      "/html/semantics/embedded-content/media-elements/track/track-element/track-cue-rendering-line-doesnt-fit.html",
@@ -194305,6 +194353,114 @@
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+     [
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+     [
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+     [
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    "mathml/presentation-markup/spaces/space-2.html": [
     [
      "/mathml/presentation-markup/spaces/space-2.html",
@@ -205742,6 +205898,11 @@
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     [
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@@ -271047,6 +271208,16 @@
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+   "css/css-tables/subpixel-collapsed-borders-ref.html": [
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    "css/css-tables/subpixel-table-cell-height-001-ref.html": [
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@@ -298787,6 +298958,11 @@
      {}
     ]
    ],
+   "html/semantics/embedded-content/media-elements/track/track-element/track-cue-rendering-empty-cue-ref.html": [
+    [
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+    ]
+   ],
    "html/semantics/embedded-content/media-elements/track/track-element/track-cue-rendering-line-doesnt-fit-ref.html": [
     [
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@@ -303112,6 +303288,51 @@
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+   "mathml/presentation-markup/fractions/frac-color-002-ref.html": [
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+   "mathml/presentation-markup/fractions/frac-numalign-denomalign-001-ref.html": [
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+   "mathml/presentation-markup/fractions/frac-visibility-001-ref.html": [
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@@ -323982,6 +324203,11 @@
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+   "webdriver/tests/send_alert_text/conftest.py": [
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    "webdriver/tests/set_timeouts/__init__.py": [
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@@ -338580,6 +338806,18 @@
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+   "client-hints/sec-ch-ua.https.html": [
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@@ -376652,12 +376890,6 @@
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@@ -411214,12 +411446,52 @@
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+   "reporting/generateTestReport.html": [
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+   "reporting/nestedReport.html": [
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+   "reporting/order.html": [
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@@ -425626,6 +425898,12 @@
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    "webxr/xrSession_cancelAnimationFrame.https.html": [
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@@ -449828,7 +450106,7 @@
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+   "cb204cabe288508280622c59b1d30bf18b74c1a1",
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@@ -577063,6 +577353,26 @@
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+   "reftest"
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@@ -634167,12 +634477,16 @@
    "76019c9b41e4fd4c56f4252d399f088b7b3e4470",
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@@ -634180,7 +634494,7 @@
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@@ -644087,6 +644401,70 @@
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@@ -666123,10 +666509,30 @@
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    "support"
   ],
   "tools/wptrunner/wptrunner/executors/executorwebdriver.py": [
-   "3f8c2bb5a3f94a5230bf93e7e4192692df8f0ab3",
+   "817b2717cb71352955315497956065c72561050f",
    "support"
   ],
   "tools/wptrunner/wptrunner/executors/executorwebkit.py": [
@@ -682240,7 +682646,7 @@
    "support"
   ],
   "tools/wptrunner/wptrunner/executors/protocol.py": [
-   "aa3565e5726a0662d10ed49cee85f153691c441f",
+   "d08b74bfc36ae97cebaa148741701dcc2a767399",
    "support"
   ],
   "tools/wptrunner/wptrunner/executors/pytestrunner/__init__.py": [
@@ -682300,7 +682706,7 @@
    "support"
   ],
   "tools/wptrunner/wptrunner/metadata.py": [
-   "3a92491aa22202e21041a258220afae6bda13a92",
+   "8699ac4fc734c1a45a4b7723b3dceea27590f8fa",
    "support"
   ],
   "tools/wptrunner/wptrunner/products.py": [
@@ -682312,7 +682718,7 @@
    "support"
   ],
   "tools/wptrunner/wptrunner/testdriver-extra.js": [
-   "6336d227db8d7d9f3e6c4276ad2f5c609e9f27e9",
+   "09d7c2908671228e625d0717e567d751470fe6cd",
    "support"
   ],
   "tools/wptrunner/wptrunner/testdriver-vendor.js": [
@@ -687959,6 +688365,10 @@
    "e69de29bb2d1d6434b8b29ae775ad8c2e48c5391",
    "support"
   ],
+  "webdriver/tests/send_alert_text/conftest.py": [
+   "f34630c3cbc5de2700552e576bc7c797d2bd724f",
+   "support"
+  ],
   "webdriver/tests/send_alert_text/send.py": [
    "6dbc03f94019abf6fc467ae2baf8fb9d21823e64",
    "wdspec"
@@ -693559,6 +693969,10 @@
    "69a35c2510983550993f630ea6f0a165c2e89369",
    "testharness"
   ],
+  "webxr/xrFrame_lifetime.https.html": [
+   "971a6d78a1e1ee1c51141a475868185318680495",
+   "testharness"
+  ],
   "webxr/xrSession_cancelAnimationFrame.https.html": [
    "9b08f93eead693c1c9aa6d7e2458988aa7dae442",
    "testharness"
diff --git a/tests/wpt/metadata/css/css-transitions/transitions-animatable-properties-01.html.ini b/tests/wpt/metadata/css/css-transitions/transitions-animatable-properties-01.html.ini
index 8850ec200da2..a100b2814538 100644
--- a/tests/wpt/metadata/css/css-transitions/transitions-animatable-properties-01.html.ini
+++ b/tests/wpt/metadata/css/css-transitions/transitions-animatable-properties-01.html.ini
@@ -74,3 +74,6 @@
   [opacity end]
     expected: FAIL
 
+  [border-bottom-width end]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/css/cssom-view/scroll-behavior-smooth.html.ini b/tests/wpt/metadata/css/cssom-view/scroll-behavior-smooth.html.ini
index 8e2ceeddfbe3..bcd187f508ce 100644
--- a/tests/wpt/metadata/css/cssom-view/scroll-behavior-smooth.html.ini
+++ b/tests/wpt/metadata/css/cssom-view/scroll-behavior-smooth.html.ini
@@ -6,6 +6,3 @@
   [Instant scrolling while doing history navigation.]
     expected: FAIL
 
-  [Smooth scrolling while doing history navigation.]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/encoding/single-byte-decoder.html.ini b/tests/wpt/metadata/encoding/single-byte-decoder.html.ini
index 2a5ec608a339..4acc2e997de6 100644
--- a/tests/wpt/metadata/encoding/single-byte-decoder.html.ini
+++ b/tests/wpt/metadata/encoding/single-byte-decoder.html.ini
@@ -32,7 +32,7 @@
 
 
 [single-byte-decoder.html?XMLHttpRequest]
-  expected: CRASH
+  expected: TIMEOUT
   [ISO-8859-2: iso_8859-2:1987 (XMLHttpRequest)]
     expected: FAIL
 
@@ -60,12 +60,6 @@
   [windows-1254: iso_8859-9:1989 (XMLHttpRequest)]
     expected: TIMEOUT
 
-  [windows-1258: cp1258 (XMLHttpRequest)]
-    expected: TIMEOUT
-
-  [windows-1256: cp1256 (XMLHttpRequest)]
-    expected: TIMEOUT
-
   [windows-1254: iso_8859-9 (XMLHttpRequest)]
     expected: TIMEOUT
 
@@ -90,34 +84,31 @@
   [windows-1256: x-cp1256 (XMLHttpRequest)]
     expected: TIMEOUT
 
-  [windows-1257: x-cp1257 (XMLHttpRequest)]
-    expected: TIMEOUT
-
   [windows-1255: cp1255 (XMLHttpRequest)]
     expected: TIMEOUT
 
-  [windows-1256: windows-1256 (XMLHttpRequest)]
-    expected: TIMEOUT
-
   [windows-1257: windows-1257 (XMLHttpRequest)]
     expected: TIMEOUT
 
   [windows-1254: iso88599 (XMLHttpRequest)]
     expected: TIMEOUT
 
-  [windows-1254: iso-8859-9 (XMLHttpRequest)]
+  [windows-1254: iso8859-9 (XMLHttpRequest)]
     expected: TIMEOUT
 
-  [windows-1254: iso8859-9 (XMLHttpRequest)]
+  [windows-1255: windows-1255 (XMLHttpRequest)]
     expected: TIMEOUT
 
-  [windows-1254: iso-ir-148 (XMLHttpRequest)]
+  [windows-1258: x-cp1258 (XMLHttpRequest)]
     expected: TIMEOUT
 
-  [windows-1254: csisolatin5 (XMLHttpRequest)]
+  [windows-1255: x-cp1255 (XMLHttpRequest)]
     expected: TIMEOUT
 
-  [windows-1255: windows-1255 (XMLHttpRequest)]
+  [windows-1258: windows-1258 (XMLHttpRequest)]
+    expected: TIMEOUT
+
+  [x-mac-cyrillic: x-mac-cyrillic (XMLHttpRequest)]
     expected: TIMEOUT
 
 
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 ff6b5fb487c9..8a008d8b2b87 100644
--- a/tests/wpt/metadata/fetch/content-type/response.window.js.ini
+++ b/tests/wpt/metadata/fetch/content-type/response.window.js.ini
@@ -312,18 +312,9 @@
   [<iframe>: separate response Content-Type: text/plain */*;charset=gbk]
     expected: FAIL
 
-  [<iframe>: combined response Content-Type: text/html;" text/plain]
-    expected: FAIL
-
-  [<iframe>: combined response Content-Type: text/html */*]
-    expected: FAIL
-
   [<iframe>: separate response Content-Type: text/html */*;charset=gbk]
     expected: FAIL
 
   [<iframe>: separate response Content-Type: text/html;x=" text/plain]
     expected: FAIL
 
-  [<iframe>: separate response Content-Type: text/html;" \\" text/plain]
-    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 d4ba399b7623..87c807a49ff9 100644
--- a/tests/wpt/metadata/fetch/nosniff/parsing-nosniff.window.js.ini
+++ b/tests/wpt/metadata/fetch/nosniff/parsing-nosniff.window.js.ini
@@ -11,6 +11,3 @@
   [X-Content-Type-Options%3A%20nosniff%0C]
     expected: FAIL
 
-  [X-Content-Type-Options%3A%20'NosniFF']
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini
deleted file mode 100644
index dc2e45516deb..000000000000
--- a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[traverse_the_history_5.html]
-  [Multiple history traversals, last would be aborted]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/html/semantics/embedded-content/media-elements/track/track-element/track-cue-rendering-empty-cue.html.ini b/tests/wpt/metadata/html/semantics/embedded-content/media-elements/track/track-element/track-cue-rendering-empty-cue.html.ini
index e8fe94b8878c..cc781d0a7825 100644
--- a/tests/wpt/metadata/html/semantics/embedded-content/media-elements/track/track-element/track-cue-rendering-empty-cue.html.ini
+++ b/tests/wpt/metadata/html/semantics/embedded-content/media-elements/track/track-element/track-cue-rendering-empty-cue.html.ini
@@ -1,4 +1,5 @@
 [track-cue-rendering-empty-cue.html]
+  expected: TIMEOUT
   [Empty cues]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/html/semantics/embedded-content/the-img-element/non-active-document.html.ini b/tests/wpt/metadata/html/semantics/embedded-content/the-img-element/non-active-document.html.ini
deleted file mode 100644
index 8cc42056d34e..000000000000
--- a/tests/wpt/metadata/html/semantics/embedded-content/the-img-element/non-active-document.html.ini
+++ /dev/null
@@ -1,10 +0,0 @@
-[non-active-document.html]
-  [DOMParser]
-    expected: FAIL
-
-  [createHTMLDocument]
-    expected: FAIL
-
-  [<template>]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/performance-timeline/webtiming-resolution.any.js.ini b/tests/wpt/metadata/performance-timeline/webtiming-resolution.any.js.ini
index 7725b118e9d9..99a24216c88b 100644
--- a/tests/wpt/metadata/performance-timeline/webtiming-resolution.any.js.ini
+++ b/tests/wpt/metadata/performance-timeline/webtiming-resolution.any.js.ini
@@ -12,6 +12,3 @@
   [Verifies the resolution of entry.startTime is at least 5 microseconds.]
     expected: TIMEOUT
 
-  [Verifies the resolution of performance.now() is at least 5 microseconds.]
-    expected: FAIL
-
diff --git a/tests/wpt/mozilla/meta/css/transition_calc_implicit.html.ini b/tests/wpt/mozilla/meta/css/transition_calc_implicit.html.ini
new file mode 100644
index 000000000000..dbea4f293ad0
--- /dev/null
+++ b/tests/wpt/mozilla/meta/css/transition_calc_implicit.html.ini
@@ -0,0 +1,2 @@
+[transition_calc_implicit.html]
+  expected: TIMEOUT
diff --git a/tests/wpt/mozilla/meta/mozilla/paint_timing.html.ini b/tests/wpt/mozilla/meta/mozilla/paint_timing.html.ini
deleted file mode 100644
index 14a9e778f396..000000000000
--- a/tests/wpt/mozilla/meta/mozilla/paint_timing.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[paint_timing.html]
-  [Performance entries observer]
-    expected: FAIL
-
diff --git a/tests/wpt/web-platform-tests/.azure-pipelines.yml b/tests/wpt/web-platform-tests/.azure-pipelines.yml
index 5bd9fd67a1d5..cb204cabe288 100644
--- a/tests/wpt/web-platform-tests/.azure-pipelines.yml
+++ b/tests/wpt/web-platform-tests/.azure-pipelines.yml
@@ -211,16 +211,3 @@ jobs:
     displayName: 'Publish results'
     inputs:
       artifactName: 'safari-preview-results'
-
-# The InvokeRESTAPI task can only run in a server job.
-- job: results_post
-  displayName: 'all tests (wpt.fyi hook)'
-  dependsOn: results_safari_preview
-  pool:
-    vmImage: 'ubuntu-16.04'
-  steps:
-  - script: curl -s -S https://wpt.fyi/api/checks/azure/$(Build.BuildId)
-    displayName: 'Invoke wpt.fyi hook'
-  - script: curl -s -S https://staging.wpt.fyi/api/checks/azure/$(Build.BuildId)
-    displayName: 'Invoke staging.wpt.fyi hook'
-    condition: succeededOrFailed()
diff --git a/tests/wpt/web-platform-tests/client-hints/resources/sec-ch-ua.py b/tests/wpt/web-platform-tests/client-hints/resources/sec-ch-ua.py
new file mode 100644
index 000000000000..a14a27dadf9e
--- /dev/null
+++ b/tests/wpt/web-platform-tests/client-hints/resources/sec-ch-ua.py
@@ -0,0 +1,11 @@
+def main(request, response):
+    ua = request.headers.get('sec-ch-ua', '')
+    response.headers.set("Content-Type", "text/html")
+    response.headers.set("Accept-CH", "UA")
+    response.headers.set("Accept-CH-Lifetime", "10")
+    response.content = '''
+<script>
+  window.opener.postMessage({ header: "%s" }, "*");
+</script>
+Sec-CH-UA: %s
+''' % (ua, ua)
diff --git a/tests/wpt/web-platform-tests/client-hints/sec-ch-ua.http.html b/tests/wpt/web-platform-tests/client-hints/sec-ch-ua.http.html
new file mode 100644
index 000000000000..e333c605301e
--- /dev/null
+++ b/tests/wpt/web-platform-tests/client-hints/sec-ch-ua.http.html
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script>
+  promise_test(t => {
+    return new Promise((resolve, reject) => {
+      var w;
+      window.onmessage = e => {
+        assert_equals(e.data.header, "", "The `Sec-CH-UA` header is not delivered.");
+        w.close();
+        resolve();
+      };
+      w = window.open("./resources/sec-ch-ua.py");
+    });
+  }, "Open HTTP window: no `Sec-CH-UA` header.")
+</script>
diff --git a/tests/wpt/web-platform-tests/client-hints/sec-ch-ua.https.html b/tests/wpt/web-platform-tests/client-hints/sec-ch-ua.https.html
new file mode 100644
index 000000000000..b293745365a6
--- /dev/null
+++ b/tests/wpt/web-platform-tests/client-hints/sec-ch-ua.https.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<head>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script>
+  var minor = "";
+  promise_test(t => {
+    return new Promise((resolve, reject) => {
+      var w;
+      window.onmessage = e => {
+        try {
+          assert_not_equals(e.data.header, "", "The `Sec-CH-UA` header is delivered.");
+          minor = e.data.header;
+        } catch (ex) {
+          reject(ex);
+        }
+        w.close();
+        resolve();
+      };
+      w = window.open("./resources/sec-ch-ua.py");
+    });
+  }, "Open HTTPS window prior to opt-in: `Sec-CH-UA` header with minor version.")
+
+  promise_test(t => {
+    return new Promise((resolve, reject) => {
+      var w;
+      window.onmessage = e => {
+        try {
+          assert_not_equals(e.data.header, "", "The `Sec-CH-UA` header is delivered.");
+          assert_not_equals(e.data.header, minor, "The `Sec-CH-UA` header is different after the opt-in than before.");
+        } catch (ex) {
+          reject(ex);
+        }
+        w.close();
+        resolve();
+      };
+      w = window.open("./resources/sec-ch-ua.py");
+    });
+  }, "Open HTTPS window post-opt-in: `Sec-CH-UA` header with minor version.")
+</script>
+</head>
diff --git a/tests/wpt/web-platform-tests/css/css-tables/subpixel-collapsed-borders-001.html b/tests/wpt/web-platform-tests/css/css-tables/subpixel-collapsed-borders-001.html
new file mode 100644
index 000000000000..a71f5cc698b7
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-tables/subpixel-collapsed-borders-001.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<link rel="author" title="David Grogan" href="mailto:dgrogan@chromium.org">
+<link rel="help" href="https://www.w3.org/TR/CSS22/tables.html#collapsing-borders">
+<link rel="help" href="https://drafts.csswg.org/css-tables-3/#border-conflict-resolution-algorithm">
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/606">
+<link rel="match" href="subpixel-collapsed-borders-ref.html">
+<meta name="flags" content="" />
+<meta name="assert" content="When collapsed border tables have border widths larger than cells', the table border wins." />
+
+<style>
+table {
+  border: 5px solid green;
+  border-collapse: collapse;
+}
+
+td {
+  width: 50px;
+  height: 50px;
+  border: 4.95px solid red;
+}
+</style>
+
+<p>There should be a square with a green border, not a red border.
+</p>
+
+<table>
+  <tr>
+    <td></td>
+  </tr>
+</table>
diff --git a/tests/wpt/web-platform-tests/css/css-tables/subpixel-collapsed-borders-002.html b/tests/wpt/web-platform-tests/css/css-tables/subpixel-collapsed-borders-002.html
new file mode 100644
index 000000000000..8f8292cd22be
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-tables/subpixel-collapsed-borders-002.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<link rel="author" title="David Grogan" href="mailto:dgrogan@chromium.org">
+<link rel="help" href="https://www.w3.org/TR/CSS22/tables.html#collapsing-borders">
+<link rel="help" href="https://drafts.csswg.org/css-tables-3/#border-conflict-resolution-algorithm">
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/606">
+<link rel="match" href="subpixel-collapsed-borders-ref.html">
+<meta name="flags" content="" />
+<meta name="assert" content="When collapsed border tables have border widths larger than cells', the table border wins even when the cell border is merely 0.01 pixels narrower" />
+
+<style>
+table {
+  border: 5px solid green;
+  border-collapse: collapse;
+}
+
+td {
+  width: 50px;
+  height: 50px;
+  border: 4.99px solid red;
+}
+</style>
+
+<p>There should be a square with a green border, not a red border.
+</p>
+
+<table>
+  <tr>
+    <td></td>
+  </tr>
+</table>
diff --git a/tests/wpt/web-platform-tests/css/css-tables/subpixel-collapsed-borders-003-ref.html b/tests/wpt/web-platform-tests/css/css-tables/subpixel-collapsed-borders-003-ref.html
new file mode 100644
index 000000000000..78e0be389393
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-tables/subpixel-collapsed-borders-003-ref.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<style>
+table {
+  border: 5.95px solid green;
+  border-collapse: collapse;
+}
+
+td {
+  width: 50px;
+  height: 50px;
+  border: 1px solid red;
+}
+</style>
+
+<p>There should be a square with a green border, not a red border.
+</p>
+
+<table>
+  <tr>
+    <td></td>
+  </tr>
+</table>
diff --git a/tests/wpt/web-platform-tests/css/css-tables/subpixel-collapsed-borders-003.html b/tests/wpt/web-platform-tests/css/css-tables/subpixel-collapsed-borders-003.html
new file mode 100644
index 000000000000..358562cbd7ff
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-tables/subpixel-collapsed-borders-003.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<link rel="author" title="David Grogan" href="mailto:dgrogan@chromium.org">
+<link rel="help" href="https://www.w3.org/TR/CSS22/tables.html#collapsing-borders">
+<link rel="help" href="https://drafts.csswg.org/css-tables-3/#border-conflict-resolution-algorithm">
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/606">
+<link rel="match" href="subpixel-collapsed-borders-003-ref.html">
+<meta name="flags" content="" />
+<meta name="assert" content="When collapsed border tables have border widths larger than cells', the table border wins even when the floored table border is the same size as the cell's." />
+
+<style>
+table {
+  border: 5.95px solid green;
+  border-collapse: collapse;
+}
+
+td {
+  width: 50px;
+  height: 50px;
+  border: 5px solid red;
+}
+</style>
+
+<p>There should be a square with a green border, not a red border.
+</p>
+
+<table>
+  <tr>
+    <td></td>
+  </tr>
+</table>
diff --git a/tests/wpt/web-platform-tests/css/css-tables/subpixel-collapsed-borders-ref.html b/tests/wpt/web-platform-tests/css/css-tables/subpixel-collapsed-borders-ref.html
new file mode 100644
index 000000000000..0a2e7a8d95b9
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-tables/subpixel-collapsed-borders-ref.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<style>
+table {
+  border: 5px solid green;
+  border-collapse: collapse;
+}
+
+td {
+  width: 50px;
+  height: 50px;
+  border: 1px solid red;
+}
+</style>
+
+<p>There should be a square with a green border, not a red border.
+</p>
+
+<table>
+  <tr>
+    <td></td>
+  </tr>
+</table>
diff --git a/tests/wpt/web-platform-tests/css/cssom/CSSStyleSheet-constructable.html b/tests/wpt/web-platform-tests/css/cssom/CSSStyleSheet-constructable.html
index e3083d283f35..80189fe2f36e 100644
--- a/tests/wpt/web-platform-tests/css/cssom/CSSStyleSheet-constructable.html
+++ b/tests/wpt/web-platform-tests/css/cssom/CSSStyleSheet-constructable.html
@@ -14,7 +14,7 @@
     <span class="yellow"></span>
   </div>
 </section>
-<section id="secondSection"></section>
+<section id="shadowHost"></section>
 <section id="thirdSection"></section>
 
 <script>
@@ -27,7 +27,8 @@
 
 const firstDiv = document.querySelector('#firstSection > div');
 const secondDiv = firstDiv.cloneNode(true);
-const shadowRoot = document.querySelector('#secondSection').attachShadow({mode: 'open'});
+const shadowHost = document.querySelector('#shadowHost');
+const shadowRoot = shadowHost.attachShadow({mode: 'open'});
 shadowRoot.appendChild(secondDiv);
 
 const greenSpan = firstDiv.children[0];
@@ -209,6 +210,24 @@
   });
 }, 'Constructed style sheets can be applied on shadow root');
 
+promise_test(() => {
+  return Promise.all(createAllSheetsPromise()).then(values => {
+    const greenStyleSheet = values[0];
+    const redStyleSheet = values[1];
+    shadowRoot.adoptedStyleSheets = [greenStyleSheet];
+    assert_equals(getComputedStyle(greenShadowSpan).color, "rgb(0, 128, 0)", "Style applies connected");
+    assert_equals(getComputedStyle(redShadowSpan).color, "rgb(0, 0, 0)", "Style applies when connected");
+    let hostParent = shadowHost.parentNode;
+    hostParent.removeChild(shadowHost);
+    assert_equals(getComputedStyle(greenShadowSpan).color, "", "Style doesn't apply when detached");
+    assert_equals(getComputedStyle(redShadowSpan).color, "", "Style doesn't apply when detached");
+    shadowRoot.adoptedStyleSheets = [redStyleSheet, greenStyleSheet];
+    hostParent.appendChild(shadowHost);
+    assert_equals(getComputedStyle(greenShadowSpan).color, "rgb(0, 128, 0)", "Style applies after reattach");
+    assert_equals(getComputedStyle(redShadowSpan).color, "rgb(255, 0, 0)", "Style applies after reattach");
+  });
+}, 'Re-attaching shadow host with adopted stylesheets work');
+
 promise_test(() => {
   const plainSheet = new CSSStyleSheet();
   const redStyleSheetPromise = plainSheet.replace(redStyleTexts[0]);
diff --git a/tests/wpt/web-platform-tests/domparsing/DOMParser-parseFromString-html.html b/tests/wpt/web-platform-tests/domparsing/DOMParser-parseFromString-html.html
index ec424423a1d2..ad65cc586184 100644
--- a/tests/wpt/web-platform-tests/domparsing/DOMParser-parseFromString-html.html
+++ b/tests/wpt/web-platform-tests/domparsing/DOMParser-parseFromString-html.html
@@ -66,6 +66,11 @@
     assert_equals(htmldoc.documentElement.namespaceURI, "http://www.w3.org/1999/xhtml");
 }, "DOMParser parses HTML tag soup with no problems");
 
+test(function() {
+   const doc = new DOMParser().parseFromString('<noembed>&lt;a&gt;</noembed>', 'text/html');
+   assert_equals(doc.querySelector('noembed').textContent, '&lt;a&gt;');
+}, 'DOMParser should handle the content of <noembed> as raw text');
+
 test(function() {
     assert_throws(new TypeError(), function() {
         new DOMParser().parseFromString("", "text/foo-this-is-invalid");
diff --git a/tests/wpt/web-platform-tests/html/semantics/embedded-content/media-elements/track/track-element/track-cue-rendering-empty-cue-ref.html b/tests/wpt/web-platform-tests/html/semantics/embedded-content/media-elements/track/track-element/track-cue-rendering-empty-cue-ref.html
new file mode 100644
index 000000000000..837c4fd7833d
--- /dev/null
+++ b/tests/wpt/web-platform-tests/html/semantics/embedded-content/media-elements/track/track-element/track-cue-rendering-empty-cue-ref.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+<title>Reference for track rendering with empty cue</title>
+<script src="/common/reftest-wait.js"></script>
+<style>
+html { overflow:hidden }
+body { margin:0 }
+.container {
+  display: inline-block;
+  position: relative;
+}
+</style>
+<div class="container">
+  <video width="320" height="180">
+    <source src="/media/white.webm" type="video/webm">
+    <source src="/media/white.mp4" type="video/mp4">
+    <script>
+      var video = document.querySelector("video");
+      video.addEventListener('playing', () => {
+        video.pause();
+        takeScreenshot();
+      }, { once: true});
+      video.play();
+    </script>
+  </video>
+</div>
+</html>
\ No newline at end of file
diff --git a/tests/wpt/web-platform-tests/html/semantics/embedded-content/media-elements/track/track-element/track-cue-rendering-empty-cue.html b/tests/wpt/web-platform-tests/html/semantics/embedded-content/media-elements/track/track-element/track-cue-rendering-empty-cue.html
index 427189f6fc78..c2d300999eea 100644
--- a/tests/wpt/web-platform-tests/html/semantics/embedded-content/media-elements/track/track-element/track-cue-rendering-empty-cue.html
+++ b/tests/wpt/web-platform-tests/html/semantics/embedded-content/media-elements/track/track-element/track-cue-rendering-empty-cue.html
@@ -1,16 +1,26 @@
 <!DOCTYPE html>
-<title>Empty cues</title>
-<script src="/common/media.js"></script>
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-<script>
-async_test(function(t) {
-    var video = document.createElement("video");
-    video.src = getVideoURI("/media/test");
-    video.addTextTrack("captions", "regular captions track", "en");
-    video.textTracks[0].addCue(new VTTCue(0, 4, ""));
+<html class="reftest-wait">
+<title>Track rendering with empty cue</title>
+<link rel="match" href="track-cue-rendering-empty-cue-ref.html">
+<style>
+html { overflow:hidden }
+body { margin:0 }
+</style>
+<script src="/common/reftest-wait.js"></script>
+<video width="320" height="180">
+  <source src="/media/white.webm" type="video/webm">
+  <source src="/media/white.mp4" type="video/mp4">
+  <script>
+    var video = document.querySelector("video");
+    var track = video.addTextTrack("captions", "regular captions track", "en");
+    track.addCue(new VTTCue(0, 4, ""));
+    track.mode = "showing";
 
-    video.onplaying = t.step_func_done();
+    video.addEventListener('playing', () => {
+      video.pause();
+      takeScreenshot();
+    }, { once: true});
     video.play();
-});
-</script>
\ No newline at end of file
+  </script>
+</video>
+</html>
\ No newline at end of file
diff --git a/tests/wpt/web-platform-tests/html/semantics/embedded-content/media-elements/track/track-element/track-cue-rendering-line-doesnt-fit-ref.html b/tests/wpt/web-platform-tests/html/semantics/embedded-content/media-elements/track/track-element/track-cue-rendering-line-doesnt-fit-ref.html
index 8354041eb2a0..c4c14bc2a394 100644
--- a/tests/wpt/web-platform-tests/html/semantics/embedded-content/media-elements/track/track-element/track-cue-rendering-line-doesnt-fit-ref.html
+++ b/tests/wpt/web-platform-tests/html/semantics/embedded-content/media-elements/track/track-element/track-cue-rendering-line-doesnt-fit-ref.html
@@ -20,7 +20,6 @@
   background: green;
   color: green;
   font-size: 120px;
-  padding: 2px;
 }
 </style>
 <div class="container">
diff --git a/tests/wpt/web-platform-tests/html/semantics/embedded-content/media-elements/track/track-element/track-cue-rendering-transformed-video-ref.html b/tests/wpt/web-platform-tests/html/semantics/embedded-content/media-elements/track/track-element/track-cue-rendering-transformed-video-ref.html
index 39461350b089..c3ee804c485b 100644
--- a/tests/wpt/web-platform-tests/html/semantics/embedded-content/media-elements/track/track-element/track-cue-rendering-transformed-video-ref.html
+++ b/tests/wpt/web-platform-tests/html/semantics/embedded-content/media-elements/track/track-element/track-cue-rendering-transformed-video-ref.html
@@ -22,7 +22,6 @@
   background: green;
   color: green;
   font-size: 50px;
-  padding: 2px;
 }
 </style>
 <div class="container">
diff --git a/tests/wpt/web-platform-tests/interfaces/webxr.idl b/tests/wpt/web-platform-tests/interfaces/webxr.idl
index 74466f856be2..899bb0daa008 100644
--- a/tests/wpt/web-platform-tests/interfaces/webxr.idl
+++ b/tests/wpt/web-platform-tests/interfaces/webxr.idl
@@ -170,7 +170,7 @@ interface XRRay {
 };
 
 enum XRHandedness {
-  "",
+  "none",
   "left",
   "right"
 };
diff --git a/tests/wpt/web-platform-tests/mathml/presentation-markup/fractions/frac-bar-001-ref.html b/tests/wpt/web-platform-tests/mathml/presentation-markup/fractions/frac-bar-001-ref.html
new file mode 100644
index 000000000000..5b7a8dff47e9
--- /dev/null
+++ b/tests/wpt/web-platform-tests/mathml/presentation-markup/fractions/frac-bar-001-ref.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>fractions bar</title>
+    <style type="text/css">
+      #container {
+          position: absolute;
+          left: 10px;
+          top: 50px;
+          width: 150px;
+          height: 150px;
+          background: green;
+      }
+    </style>
+  </head>
+  <body>
+    <p>This test passes if you see a green square.</p>
+    <div id="container"></div>
+  </body>
+</html>
diff --git a/tests/wpt/web-platform-tests/mathml/presentation-markup/fractions/frac-bar-001.html b/tests/wpt/web-platform-tests/mathml/presentation-markup/fractions/frac-bar-001.html
new file mode 100644
index 000000000000..6688a587b1f2
--- /dev/null
+++ b/tests/wpt/web-platform-tests/mathml/presentation-markup/fractions/frac-bar-001.html
@@ -0,0 +1,55 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+  <head>
+    <meta charset="utf-8">
+    <title>fractions bar</title>
+    <link rel="help" href="http://www.mathml-association.org/MathMLinHTML5/S3.html#SS3.SSS2">
+    <meta name="assert" content="Verifies painting of the fraction bar">
+    <link rel="match" href="frac-bar-001-ref.html">
+    <style type="text/css">
+      @font-face {
+        font-family: TestFont;
+        src: url("/fonts/math/fraction-rulethickness10000.woff");
+      }
+      math {
+        /* FractionRuleThickness = 10000 * 1 / 1000 = 10px; */
+        /* The gap / shift / axisheight parameters are set to 0. */
+        font-family: "TestFont";
+        font-size: 1px;
+      }
+      #container {
+          position: absolute;
+          left: 0;
+          top: 0;
+      }
+    </style>
+    <script src="/common/reftest-wait.js"></script>
+    <script>
+      window.addEventListener("load", () => {
+        // Delay the check to workaround WebKit's bug https://webkit.org/b/174030.
+        requestAnimationFrame(() => { document.fonts.ready.then(adjustPositionOfFraction); });
+      });
+      function adjustPositionOfFraction()
+      {
+        requestAnimationFrame(() => {
+          var container = document.getElementById("container");
+          var numeratorBox = document.getElementById("numerator").getBoundingClientRect();
+          container.style.left = (10 - numeratorBox.left) + "px";
+          container.style.top = (50 - numeratorBox.top) + "px";
+          requestAnimationFrame(takeScreenshot);
+        });
+      }
+    </script>
+  </head>
+  <body>
+    <p>This test passes if you see a green square.</p>
+    <div id="container">
+      <math>
+        <mfrac style="color: green; font-size: 15em">
+          <mspace id="numerator" width="150px"></mspace>
+          <mspace></mspace>
+        </mfrac>
+      </math>
+    </div>
+  </body>
+</html>
diff --git a/tests/wpt/web-platform-tests/mathml/presentation-markup/fractions/frac-color-001-notref.html b/tests/wpt/web-platform-tests/mathml/presentation-markup/fractions/frac-color-001-notref.html
new file mode 100644
index 000000000000..498d6277a325
--- /dev/null
+++ b/tests/wpt/web-platform-tests/mathml/presentation-markup/fractions/frac-color-001-notref.html
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Fraction bar color</title>
+  </head>
+  <body style="font-size: 20pt;">
+    <p>This test passes if you see a fraction with a blue fraction bar.</p>
+    <math>
+      <mfrac>
+        <mspace width="200px" height="20px" style="background: black"></mspace>
+        <mspace width="200px" height="20px" style="background: black"></mspace>
+      </mfrac>
+    </math>
+  </body>
+</html>
diff --git a/tests/wpt/web-platform-tests/mathml/presentation-markup/fractions/frac-color-001.html b/tests/wpt/web-platform-tests/mathml/presentation-markup/fractions/frac-color-001.html
new file mode 100644
index 000000000000..bc61dbf51ffe
--- /dev/null
+++ b/tests/wpt/web-platform-tests/mathml/presentation-markup/fractions/frac-color-001.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Fraction bar color</title>
+    <link rel="help" href="http://www.mathml-association.org/MathMLinHTML5/S3.html#SS3.SSS2">
+    <meta name="assert" content="The CSS color property has an effect on the fraction bar.">
+    <link rel="mismatch" href="frac-color-001-notref.html">
+  </head>
+  <body style="font-size: 20pt;">
+    <p>This test passes if you see a fraction with a blue fraction bar.</p>
+    <math>
+      <mfrac style="color: blue;">
+        <mspace width="200px" height="20px" style="background: black"></mspace>
+        <mspace width="200px" height="20px" style="background: black"></mspace>
+      </mfrac>
+    </math>
+  </body>
+</html>
diff --git a/tests/wpt/web-platform-tests/mathml/presentation-markup/fractions/frac-color-002-ref.html b/tests/wpt/web-platform-tests/mathml/presentation-markup/fractions/frac-color-002-ref.html
new file mode 100644
index 000000000000..fe2f4fa7b189
--- /dev/null
+++ b/tests/wpt/web-platform-tests/mathml/presentation-markup/fractions/frac-color-002-ref.html
@@ -0,0 +1,14 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>fractions color</title>
+  </head>
+  <body>
+    <p>This test passes if you see a green square and a blue square.</p>
+    <div style="background: green; width: 200px; height: 200px;">
+    </div>
+    <div style="background: blue; width: 200px; height: 200px;">
+    </div>
+  </body>
+</html>
diff --git a/tests/wpt/web-platform-tests/mathml/presentation-markup/fractions/frac-color-002.html b/tests/wpt/web-platform-tests/mathml/presentation-markup/fractions/frac-color-002.html
new file mode 100644
index 000000000000..d7cc88cb21bd
--- /dev/null
+++ b/tests/wpt/web-platform-tests/mathml/presentation-markup/fractions/frac-color-002.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>fractions color</title>
+    <link rel="help" href="http://www.mathml-association.org/MathMLinHTML5/S3.html#SS3.SSS2">
+    <meta name="assert" content="Verifies the color attribute affects the fraction bar">
+    <link rel="match" href="frac-color-002-ref.html">
+  </head>
+  <body>
+    <p>This test passes if you see a green square and a blue square.</p>
+    <div style="background: green; width: 200px; height: 200px;">
+      <math>
+        <mspace width="10px"></mspace>
+        <mfrac style="color: green">
+          <mspace width="150px" height="20px"></mspace>
+          <mspace width="150px" height="20px"></mspace>
+        </mfrac>
+      </math>
+    </div>
+    <div style="background: blue; width: 200px; height: 200px;">
+      <math>
+        <mspace width="10px"></mspace>
+        <mfrac style="color: blue">
+          <mspace width="150px" height="20px"></mspace>
+          <mspace width="150px" height="20px"></mspace>
+        </mfrac>
+      </math>
+    </div>
+  </body>
+</html>
diff --git a/tests/wpt/web-platform-tests/mathml/presentation-markup/fractions/frac-linethickness-001-ref.html b/tests/wpt/web-platform-tests/mathml/presentation-markup/fractions/frac-linethickness-001-ref.html
new file mode 100644
index 000000000000..c703edb764fe
--- /dev/null
+++ b/tests/wpt/web-platform-tests/mathml/presentation-markup/fractions/frac-linethickness-001-ref.html
@@ -0,0 +1,39 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>fractions linethickness</title>
+    <style type="text/css">
+      @font-face {
+        font-family: TestFont;
+        src: url("/fonts/math/fraction-rulethickness10000.woff");
+      }
+      math {
+        /* FractionRuleThickness = 10000 * 1 / 1000 = 10px; */
+        font-family: "TestFont";
+        font-size: 1px;
+      }
+    </style>
+  </head>
+  <body>
+    <p>This test passes if you see fractions with line thickness equal to the height of their blue numerator and cyan denominator.</p>
+    <math>
+      <mfrac linethickness="5px">
+        <mspace width="20px" height="5px" style="background: blue"></mspace>
+        <mspace width="20px" height="5px" style="background: cyan"></mspace>
+      </mfrac>
+      <mfrac linethickness="10px">
+        <mspace width="20px" height="10px" style="background: blue"></mspace>
+        <mspace width="20px" height="10px" style="background: cyan"></mspace>
+      </mfrac>
+      <mfrac linethickness="20px">
+        <mspace width="20px" height="20px" style="background: blue"></mspace>
+        <mspace width="20px" height="20px" style="background: cyan"></mspace>
+      </mfrac>
+      <mfrac linethickness="50px">
+        <mspace width="20px" height="50px" style="background: blue"></mspace>
+        <mspace width="20px" height="50px" style="background: cyan"></mspace>
+      </mfrac>
+    </math>
+  </body>
+</html>
diff --git a/tests/wpt/web-platform-tests/mathml/presentation-markup/fractions/frac-linethickness-001.html b/tests/wpt/web-platform-tests/mathml/presentation-markup/fractions/frac-linethickness-001.html
new file mode 100644
index 000000000000..94111174c6aa
--- /dev/null
+++ b/tests/wpt/web-platform-tests/mathml/presentation-markup/fractions/frac-linethickness-001.html
@@ -0,0 +1,42 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>fractions linethickness</title>
+    <link rel="help" href="http://www.mathml-association.org/MathMLinHTML5/S3.html#SS3.SSS2">
+    <meta name="assert" content="Verifies 'thin', 'medium', 'thick' and unitless values for the linethickness attribute of the mfrac element">
+    <link rel="match" href="frac-linethickness-001-ref.html">
+    <style type="text/css">
+      @font-face {
+        font-family: TestFont;
+        src: url("/fonts/math/fraction-rulethickness10000.woff");
+      }
+      math {
+        /* FractionRuleThickness = 10000 * 1 / 1000 = 10px; */
+        font-family: "TestFont";
+        font-size: 1px;
+      }
+    </style>
+  </head>
+  <body>
+    <p>This test passes if you see fractions with line thickness equal to the height of their blue numerator and cyan denominator.</p>
+    <math>
+      <mfrac linethickness="thin">
+        <mspace width="20px" height="5px" style="background: blue"></mspace>
+        <mspace width="20px" height="5px" style="background: cyan"></mspace>
+      </mfrac>
+      <mfrac linethickness="medium">
+        <mspace width="20px" height="10px" style="background: blue"></mspace>
+        <mspace width="20px" height="10px" style="background: cyan"></mspace>
+      </mfrac>
+      <mfrac linethickness="thick">
+        <mspace width="20px" height="20px" style="background: blue"></mspace>
+        <mspace width="20px" height="20px" style="background: cyan"></mspace>
+      </mfrac>
+      <mfrac linethickness="5">
+        <mspace width="20px" height="50px" style="background: blue"></mspace>
+        <mspace width="20px" height="50px" style="background: cyan"></mspace>
+      </mfrac>
+    </math>
+  </body>
+</html>
diff --git a/tests/wpt/web-platform-tests/mathml/presentation-markup/fractions/frac-linethickness-002-ref.html b/tests/wpt/web-platform-tests/mathml/presentation-markup/fractions/frac-linethickness-002-ref.html
new file mode 100644
index 000000000000..69663938c195
--- /dev/null
+++ b/tests/wpt/web-platform-tests/mathml/presentation-markup/fractions/frac-linethickness-002-ref.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>fractions linethickness</title>
+    <style type="text/css">
+      @font-face {
+        font-family: TestFont;
+        src: url("/fonts/math/fraction-rulethickness10000.woff");
+      }
+      math {
+        /* FractionRuleThickness = 10000 * 1 / 1000 = 10px; */
+        font-family: "TestFont";
+        font-size: 1px;
+      }
+    </style>
+  </head>
+  <body>
+    <p>This test passes if you see fraction with a cyan denominator and
+      a blue numerator as tall as its black bar.</p>
+    <math>
+      <mfrac linethickness="0px">
+        <mspace width="20px" height="0px" style="background: blue"></mspace>
+        <mspace width="20px" height="10px" style="background: cyan"></mspace>
+      </mfrac>
+    </math>
+    <math>
+      <mfrac linethickness="50px">
+        <mspace width="20px" height="50px" style="background: blue"></mspace>
+        <mspace width="20px" height="10px" style="background: cyan"></mspace>
+      </mfrac>
+    </math>
+    <math style="font-size: 180px">
+      <mfrac linethickness="0.3888888888888889em">
+        <mspace width="20px" height="70px" style="background: blue"></mspace>
+        <mspace width="20px" height="10px" style="background: cyan"></mspace>
+      </mfrac>
+    </math>
+  </body>
+</html>
diff --git a/tests/wpt/web-platform-tests/mathml/presentation-markup/fractions/frac-linethickness-002.html b/tests/wpt/web-platform-tests/mathml/presentation-markup/fractions/frac-linethickness-002.html
new file mode 100644
index 000000000000..5bb0d6bfb9d6
--- /dev/null
+++ b/tests/wpt/web-platform-tests/mathml/presentation-markup/fractions/frac-linethickness-002.html
@@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>fractions linethickness</title>
+    <link rel="help" href="http://www.mathml-association.org/MathMLinHTML5/S3.html#SS3.SSS2">
+    <meta name="assert" content="Verifies fraction with negative, percent and named space linethickness values.">
+    <link rel="match" href="frac-linethickness-002-ref.html">
+    <style type="text/css">
+      @font-face {
+        font-family: TestFont;
+        src: url("/fonts/math/fraction-rulethickness10000.woff");
+      }
+      math {
+        /* FractionRuleThickness = 10000 * 1 / 1000 = 10px; */
+        font-family: "TestFont";
+        font-size: 1px;
+      }
+    </style>
+  </head>
+  <body>
+    <p>This test passes if you see fraction with a cyan denominator and
+      a blue numerator as tall as its black bar.</p>
+    <math>
+      <mfrac linethickness="-1.23em">
+        <mspace width="20px" height="0px" style="background: blue"></mspace>
+        <mspace width="20px" height="10px" style="background: cyan"></mspace>
+      </mfrac>
+    </math>
+    <math>
+      <mfrac linethickness="500%">
+        <mspace width="20px" height="50px" style="background: blue"></mspace>
+        <mspace width="20px" height="10px" style="background: cyan"></mspace>
+      </mfrac>
+    </math>
+    <math style="font-size: 180px">
+      <mfrac linethickness="veryverythickmathspace">
+        <mspace width="20px" height="70px" style="background: blue"></mspace>
+        <mspace width="20px" height="10px" style="background: cyan"></mspace>
+      </mfrac>
+    </math>
+  </body>
+</html>
diff --git a/tests/wpt/web-platform-tests/mathml/presentation-markup/fractions/frac-linethickness-003-notref.html b/tests/wpt/web-platform-tests/mathml/presentation-markup/fractions/frac-linethickness-003-notref.html
new file mode 100644
index 000000000000..934d66633397
--- /dev/null
+++ b/tests/wpt/web-platform-tests/mathml/presentation-markup/fractions/frac-linethickness-003-notref.html
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>fractions linethickness</title>
+  </head>
+  <body>
+    <p>This test passes if you see a fraction without fraction bar.</p>
+    <math>
+      <mfrac>
+        <mspace width="20px" height="5px" style="background: blue"></mspace>
+        <mspace width="20px" height="5px" style="background: cyan"></mspace>
+      </mfrac>
+    </math>
+  </body>
+</html>
diff --git a/tests/wpt/web-platform-tests/mathml/presentation-markup/fractions/frac-linethickness-003.html b/tests/wpt/web-platform-tests/mathml/presentation-markup/fractions/frac-linethickness-003.html
new file mode 100644
index 000000000000..e535e703b52c
--- /dev/null
+++ b/tests/wpt/web-platform-tests/mathml/presentation-markup/fractions/frac-linethickness-003.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>fractions linethickness</title>
+    <link rel="help" href="http://www.mathml-association.org/MathMLinHTML5/S3.html#SS3.SSS2">
+    <meta name="assert" content="Verifies fraction with 0px bar.">
+    <link rel="mismatch" href="frac-linethickness-003-notref.html">
+  </head>
+  <body>
+    <p>This test passes if you see a fraction without fraction bar.</p>
+    <math>
+      <mfrac linethickness="0px">
+        <mspace width="20px" height="5px" style="background: blue"></mspace>
+        <mspace width="20px" height="5px" style="background: cyan"></mspace>
+      </mfrac>
+    </math>
+  </body>
+</html>
diff --git a/tests/wpt/web-platform-tests/mathml/presentation-markup/fractions/frac-mrow-001-ref.html b/tests/wpt/web-platform-tests/mathml/presentation-markup/fractions/frac-mrow-001-ref.html
new file mode 100644
index 000000000000..e42cb96fe838
--- /dev/null
+++ b/tests/wpt/web-platform-tests/mathml/presentation-markup/fractions/frac-mrow-001-ref.html
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Fraction mrow</title>
+  </head>
+  <body style="font-size: 20pt;">
+    <p>This test passes if you see a fraction with a blue square as numerator and a cyan square as denominator.</p>
+    <math>
+      <mfrac>
+        <mspace width="60px" height="60px" style="background: blue"></mspace>
+        <mspace width="60px" height="60px" style="background: cyan"></mspace>
+      </mfrac>
+    </math>
+  </body>
+</html>
diff --git a/tests/wpt/web-platform-tests/mathml/presentation-markup/fractions/frac-mrow-001.html b/tests/wpt/web-platform-tests/mathml/presentation-markup/fractions/frac-mrow-001.html
new file mode 100644
index 000000000000..e5c6f5252944
--- /dev/null
+++ b/tests/wpt/web-platform-tests/mathml/presentation-markup/fractions/frac-mrow-001.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Fraction mrow</title>
+    <link rel="help" href="http://www.mathml-association.org/MathMLinHTML5/S3.html#SS3.SSS2">
+    <meta name="assert" content="This test that <mrow> elements can be used as numerator and denominator of fractions.">
+    <link rel="match" href="frac-mrow-001-ref.html">
+  </head>
+  <body style="font-size: 20pt;">
+    <p>This test passes if you see a fraction with a blue square as numerator and a cyan square as denominator.</p>
+    <math>
+      <mfrac>
+        <mrow>
+          <mspace width="30px" height="60px" style="background: blue"></mspace>
+          <mspace width="30px" height="60px" style="background: blue "></mspace>
+        </mrow>
+        <mrow>
+          <mspace width="30px" height="60px" style="background: cyan"></mspace>
+          <mspace width="30px" height="60px" style="background: cyan "></mspace>
+        </mrow>
+      </mfrac>
+    </math>
+  </body>
+</html>
diff --git a/tests/wpt/web-platform-tests/mathml/presentation-markup/fractions/frac-numalign-denomalign-001-ref.html b/tests/wpt/web-platform-tests/mathml/presentation-markup/fractions/frac-numalign-denomalign-001-ref.html
new file mode 100644
index 000000000000..2fa978624dc2
--- /dev/null
+++ b/tests/wpt/web-platform-tests/mathml/presentation-markup/fractions/frac-numalign-denomalign-001-ref.html
@@ -0,0 +1,73 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Fraction numalign denomalign</title>
+  </head>
+  <body>
+    <p>This test passes if you see 3 fractions with a numerator respectively
+      aligned left/center/right with respect to the denominator ;
+      followed by 3 fractions with a denominator respectively aligned
+      left/center/right with respect to the numerator.</p>
+    <p>
+      <math>
+        <mfrac>
+          <mrow>
+            <mspace width="10px" height="20px" style="background: blue;"></mspace>
+            <mspace width="20px" height="20px"></mspace>
+          </mrow>
+          <mspace width="30px" height="20px" style="background: cyan;"></mspace>
+        </mfrac>
+      </math>
+      <math>
+        <mfrac>
+          <mrow>
+            <mspace width="10px" height="20px"></mspace>
+            <mspace width="10px" height="20px" style="background: blue;"></mspace>
+            <mspace width="10px" height="20px"></mspace>
+          </mrow>
+          <mspace width="30px" height="20px" style="background: cyan;"></mspace>
+        </mfrac>
+      </math>
+      <math>
+        <mfrac>
+          <mrow>
+            <mspace width="20px" height="20px"></mspace>
+            <mspace width="10px" height="20px" style="background: blue;"></mspace>
+          </mrow>
+          <mspace width="30px" height="20px" style="background: cyan;"></mspace>
+        </mfrac>
+      </math>
+    </p>
+    <p>
+      <math>
+        <mfrac>
+          <mspace width="30px" height="20px" style="background: cyan;"></mspace>
+          <mrow>
+            <mspace width="10px" height="20px" style="background: blue;"></mspace>
+            <mspace width="20px" height="20px"></mspace>
+          </mrow>
+        </mfrac>
+      </math>
+      <math>
+        <mfrac>
+          <mspace width="30px" height="20px" style="background: cyan;"></mspace>
+          <mrow>
+            <mspace width="10px" height="20px"></mspace>
+            <mspace width="10px" height="20px" style="background: blue;"></mspace>
+            <mspace width="10px" height="20px"></mspace>
+          </mrow>
+        </mfrac>
+      </math>
+      <math>
+        <mfrac>
+          <mspace width="30px" height="20px" style="background: cyan;"></mspace>
+          <mrow>
+            <mspace width="20px" height="20px"></mspace>
+            <mspace width="10px" height="20px" style="background: blue;"></mspace>
+          </mrow>
+        </mfrac>
+      </math>
+    </p>
+  </body>
+</html>
diff --git a/tests/wpt/web-platform-tests/mathml/presentation-markup/fractions/frac-numalign-denomalign-001.html b/tests/wpt/web-platform-tests/mathml/presentation-markup/fractions/frac-numalign-denomalign-001.html
new file mode 100644
index 000000000000..61f49e2ff538
--- /dev/null
+++ b/tests/wpt/web-platform-tests/mathml/presentation-markup/fractions/frac-numalign-denomalign-001.html
@@ -0,0 +1,56 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Fraction numalign denomalign</title>
+    <link rel="help" href="http://www.mathml-association.org/MathMLinHTML5/S3.html#SS3.SSS2">
+    <meta name="assert" content="This fraction alignment with the numalign/denomalign attributes.">
+    <link rel="match" href="frac-numalign-denomalign-001-ref.html">
+  </head>
+  <body>
+    <p>This test passes if you see 3 fractions with a numerator respectively
+      aligned left/center/right with respect to the denominator ;
+      followed by 3 fractions with a denominator respectively aligned
+      left/center/right with respect to the numerator.</p>
+    <p>
+      <math>
+        <mfrac numalign="left">
+          <mspace width="10px" height="20px" style="background: blue;"></mspace>
+          <mspace width="30px" height="20px" style="background: cyan;"></mspace>
+        </mfrac>
+      </math>
+      <math>
+        <mfrac numalign="center">
+          <mspace width="10px" height="20px" style="background: blue;"></mspace>
+          <mspace width="30px" height="20px" style="background: cyan;"></mspace>
+        </mfrac>
+      </math>
+      <math>
+        <mfrac numalign="right">
+          <mspace width="10px" height="20px" style="background: blue;"></mspace>
+          <mspace width="30px" height="20px" style="background: cyan;"></mspace>
+        </mfrac>
+      </math>
+    </p>
+    <p>
+      <math>
+        <mfrac denomalign="left">
+          <mspace width="30px" height="20px" style="background: cyan;"></mspace>
+          <mspace width="10px" height="20px" style="background: blue;"></mspace>
+        </mfrac>
+      </math>
+      <math>
+        <mfrac denomalign="center">
+          <mspace width="30px" height="20px" style="background: cyan;"></mspace>
+          <mspace width="10px" height="20px" style="background: blue;"></mspace>
+        </mfrac>
+      </math>
+      <math>
+        <mfrac denomalign="right">
+          <mspace width="30px" height="20px" style="background: cyan;"></mspace>
+          <mspace width="10px" height="20px" style="background: blue;"></mspace>
+        </mfrac>
+      </math>
+    </p>
+  </body>
+</html>
diff --git a/tests/wpt/web-platform-tests/mathml/presentation-markup/fractions/frac-visibility-001-ref.html b/tests/wpt/web-platform-tests/mathml/presentation-markup/fractions/frac-visibility-001-ref.html
new file mode 100644
index 000000000000..41a262d51119
--- /dev/null
+++ b/tests/wpt/web-platform-tests/mathml/presentation-markup/fractions/frac-visibility-001-ref.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Fraction bar visibility</title>
+  </head>
+  <body>
+    <p>This test passes if you see a green square and no red.</p>
+    <div style="background: green; width: 200px; height: 200px;">
+    </div>
+  </body>
+</html>
diff --git a/tests/wpt/web-platform-tests/mathml/presentation-markup/fractions/frac-visibility-001.html b/tests/wpt/web-platform-tests/mathml/presentation-markup/fractions/frac-visibility-001.html
new file mode 100644
index 000000000000..b98f68d2a585
--- /dev/null
+++ b/tests/wpt/web-platform-tests/mathml/presentation-markup/fractions/frac-visibility-001.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Fraction bar visibility</title>
+    <link rel="help" href="http://www.mathml-association.org/MathMLinHTML5/S3.html#SS3.SSS2">
+    <meta name="assert" content="The CSS visible property affects the rendering of the fraction bar.">
+    <link rel="match" href="frac-visibility-001-ref.html">
+  </head>
+  <body>
+    <p>This test passes if you see a green square and no red.</p>
+    <div style="background: green; width: 200px; height: 200px;">
+      <math>
+        <mfrac style="visibility: hidden; color: red">
+          <mspace width="200px" height="20px"></mspace>
+          <mspace width="200px" height="20px"></mspace>
+        </mfrac>
+      </math>
+    </div>
+  </body>
+</html>
diff --git a/tests/wpt/web-platform-tests/reporting/bufferSize.html b/tests/wpt/web-platform-tests/reporting/bufferSize.html
new file mode 100644
index 000000000000..b3512b3bc93b
--- /dev/null
+++ b/tests/wpt/web-platform-tests/reporting/bufferSize.html
@@ -0,0 +1,29 @@
+<!DOCTYPE HTML>
+<meta charset=utf-8>
+<title>Reporting: Buffer size</title>
+<link rel="author" title="Paul Meyer" href="paulmeyer@chromium.org">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script>
+  // Test the buffer size (100) of ReportingObserver.
+  async_test(async function(test) {
+    for (i = 0; i != 110; ++i)
+      await test_driver.generate_test_report("" + i);
+
+    var observer = new ReportingObserver(function(reports) {
+      test.step(function() {
+        // Only (the most recent) 100 reports should be observed, even though
+        // 110 were buffered.
+        assert_equals(reports.length, 100);
+        for(i = 0; i != 100; ++i) {
+          assert_equals(reports[i].body.message, "" + (i + 10));
+        }
+      });
+
+      test.done();
+    }, {buffered: true});
+    observer.observe();
+  }, "Buffer size");
+</script>
diff --git a/tests/wpt/web-platform-tests/reporting/disconnect.html b/tests/wpt/web-platform-tests/reporting/disconnect.html
new file mode 100644
index 000000000000..2dc5e8fd2de7
--- /dev/null
+++ b/tests/wpt/web-platform-tests/reporting/disconnect.html
@@ -0,0 +1,25 @@
+<!DOCTYPE HTML>
+<meta charset=utf-8>
+<title>Reporting: Disconnect</title>
+<link rel="author" title="Paul Meyer" href="paulmeyer@chromium.org">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script>
+  async_test(async function(test) {
+    var observer = new ReportingObserver(function(reports, observer) {
+      test.step(function() {
+        assert_equals(reports.length, 1);
+        assert_equals(reports[0].body.message, "Test message.");
+      });
+      test.done();
+    });
+    observer.observe();
+
+    // The observer should still receive this report even though disconnect()
+    // is called immediately afterwards.
+    await test_driver.generate_test_report("Test message.");
+    observer.disconnect();
+  }, "Disconnect");
+</script>
diff --git a/tests/wpt/web-platform-tests/reporting/generateTestReport.html b/tests/wpt/web-platform-tests/reporting/generateTestReport.html
new file mode 100644
index 000000000000..e3c2735686a0
--- /dev/null
+++ b/tests/wpt/web-platform-tests/reporting/generateTestReport.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<meta charset="utf-8" />
+<title>Reporting: Generate Test Report</title>
+<link rel="author" title="Paul Meyer" href="paulmeyer@chromium.org">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script>
+  // Test that the "generate_test_report" API works.
+  async_test(function(test) {
+    var observer = new ReportingObserver(function(reports) {
+      test.step(function() {
+        assert_equals(reports.length, 1);
+        // Ensure that the contents of the report are valid.
+        assert_equals(reports[0].type, "test");
+        assert_true(reports[0].url.endsWith("reporting/generateTestReport.html"));
+        assert_equals(reports[0].body.message, "Test message.");
+      });
+      test.done();
+    });
+    observer.observe();
+
+    // This should result in a "test" type report being generated and observed.
+    test_driver.generate_test_report("Test message.");
+  }, "Generate Test Report");
+</script>
diff --git a/tests/wpt/web-platform-tests/reporting/nestedReport.html b/tests/wpt/web-platform-tests/reporting/nestedReport.html
new file mode 100644
index 000000000000..156338ee7465
--- /dev/null
+++ b/tests/wpt/web-platform-tests/reporting/nestedReport.html
@@ -0,0 +1,30 @@
+<!DOCTYPE HTML>
+<meta charset=utf-8>
+<title>Reporting: Nested report</title>
+<link rel="author" title="Paul Meyer" href="paulmeyer@chromium.org">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script>
+  // Test that reports can be generated within a ReportingObserver
+  // callback. These reports should be received by the same observer.
+  async_test(function(test) {
+    var step = 0;
+    var observer = new ReportingObserver(async function(reports, observer) {
+      test.step(function() {
+        assert_equals(reports.length, 1);
+        assert_equals(reports[0].body.message, "" + step);
+      });
+
+      ++step;
+      if (step == 3)
+        test.done();
+
+      test_driver.generate_test_report("" + step);
+    });
+    observer.observe();
+
+    test_driver.generate_test_report("0");
+  }, "Nested report");
+</script>
diff --git a/tests/wpt/web-platform-tests/reporting/order.html b/tests/wpt/web-platform-tests/reporting/order.html
new file mode 100644
index 000000000000..c43964220c98
--- /dev/null
+++ b/tests/wpt/web-platform-tests/reporting/order.html
@@ -0,0 +1,32 @@
+<!DOCTYPE HTML>
+<meta charset=utf-8>
+<title>Reporting: Order</title>
+<link rel="author" title="Paul Meyer" href="paulmeyer@chromium.org">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<p id="error">No error</p>
+<script>
+  var count = 0;
+  async_test(function(test) {
+    var observer = new ReportingObserver(function(reports) {
+      test.step(function() {
+        // Reports should be received in the same order that they were
+        // generated.
+        for(i in reports) {
+          assert_equals(reports[i].body.message, "" + count++);
+        }
+      });
+
+      if (count == 10)
+        test.done();
+    });
+    observer.observe();
+
+    for (i = 0; i != 10; ++i)
+      test_driver.generate_test_report("" + i);
+  }, "Order");
+</script>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/resources/testdriver.js b/tests/wpt/web-platform-tests/resources/testdriver.js
index e328302e4f34..031be1b7e550 100644
--- a/tests/wpt/web-platform-tests/resources/testdriver.js
+++ b/tests/wpt/web-platform-tests/resources/testdriver.js
@@ -194,6 +194,20 @@
          */
         action_sequence: function(actions) {
             return window.test_driver_internal.action_sequence(actions);
+        },
+
+        /**
+         * Generates a test report on the current page
+         *
+         * The generate_test_report function generates a report (to be observed
+         * by ReportingObserver) for testing purposes, as described in
+         * {@link https://w3c.github.io/reporting/#generate-test-report-command}
+         *
+         * @returns {Promise} fulfilled after the report is generated, or
+         *                    rejected if the report generation fails
+         */
+        generate_test_report: function(message) {
+            return window.test_driver_internal.generate_test_report(message);
         }
     };
 
@@ -281,6 +295,17 @@
          */
         action_sequence: function(actions) {
             return Promise.reject(new Error("unimplemented"));
+        },
+
+        /**
+         * Generates a test report on the current page
+         *
+         * @param {String} message - the message to be contained in the report
+         * @returns {Promise} fulfilled after the report is generated, or
+         *                    rejected if the report generation fails
+         */
+        generate_test_report: function(message) {
+            return Promise.reject(new Error("unimplemented"));
         }
     };
 })();
diff --git a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/executors/base.py b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/executors/base.py
index 0e54eca778b3..41cf2c641d29 100644
--- a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/executors/base.py
+++ b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/executors/base.py
@@ -509,7 +509,8 @@ def __init__(self, logger, protocol, test_window):
         self.actions = {
             "click": ClickAction(self.logger, self.protocol),
             "send_keys": SendKeysAction(self.logger, self.protocol),
-            "action_sequence": ActionSequenceAction(self.logger, self.protocol)
+            "action_sequence": ActionSequenceAction(self.logger, self.protocol),
+            "generate_test_report": GenerateTestReportAction(self.logger, self.protocol)
         }
 
     def __call__(self, result):
@@ -593,3 +594,13 @@ def __call__(self, payload):
     def get_element(self, selector):
         element = self.protocol.select.element_by_selector(selector)
         return element
+
+class GenerateTestReportAction(object):
+    def __init__(self, logger, protocol):
+        self.logger = logger
+        self.protocol = protocol
+
+    def __call__(self, payload):
+        message = payload["message"]
+        self.logger.debug("Generating test report: %s" % message)
+        self.protocol.generate_test_report.generate_test_report(message)
diff --git a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/executors/executorselenium.py b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/executors/executorselenium.py
index 218684217129..fa257e1296e9 100644
--- a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/executors/executorselenium.py
+++ b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/executors/executorselenium.py
@@ -213,9 +213,6 @@ def connect(self):
                                                                             resolve_ip=False),
                                           desired_capabilities=self.capabilities)
 
-    def after_conect(self):
-        pass
-
     def teardown(self):
         self.logger.debug("Hanging up on Selenium session")
         try:
diff --git a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/executors/executorwebdriver.py b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/executors/executorwebdriver.py
index 3f8c2bb5a3f9..817b2717cb71 100644
--- a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/executors/executorwebdriver.py
+++ b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/executors/executorwebdriver.py
@@ -20,7 +20,8 @@
                        ClickProtocolPart,
                        SendKeysProtocolPart,
                        ActionSequenceProtocolPart,
-                       TestDriverProtocolPart)
+                       TestDriverProtocolPart,
+                       GenerateTestReportProtocolPart)
 from ..testrunner import Stop
 
 import webdriver as client
@@ -188,6 +189,15 @@ def send_message(self, message_type, status, message=None):
         self.webdriver.execute_script("window.postMessage(%s, '*')" % json.dumps(obj))
 
 
+class WebDriverGenerateTestReportProtocolPart(GenerateTestReportProtocolPart):
+    def setup(self):
+        self.webdriver = self.parent.webdriver
+
+    def generate_test_report(self, message):
+        json_message = {"message": message}
+        self.webdriver.send_session_command("POST", "reporting/generate_test_report", json_message)
+
+
 class WebDriverProtocol(Protocol):
     implements = [WebDriverBaseProtocolPart,
                   WebDriverTestharnessProtocolPart,
@@ -195,7 +205,8 @@ class WebDriverProtocol(Protocol):
                   WebDriverClickProtocolPart,
                   WebDriverSendKeysProtocolPart,
                   WebDriverActionSequenceProtocolPart,
-                  WebDriverTestDriverProtocolPart]
+                  WebDriverTestDriverProtocolPart,
+                  WebDriverGenerateTestReportProtocolPart]
 
     def __init__(self, executor, browser, capabilities, **kwargs):
         super(WebDriverProtocol, self).__init__(executor, browser)
@@ -214,9 +225,6 @@ def connect(self):
         self.webdriver.start()
 
 
-    def after_conect(self):
-        pass
-
     def teardown(self):
         self.logger.debug("Hanging up on WebDriver session")
         try:
diff --git a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/executors/protocol.py b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/executors/protocol.py
index aa3565e5726a..d08b74bfc36a 100644
--- a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/executors/protocol.py
+++ b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/executors/protocol.py
@@ -265,6 +265,7 @@ def element(self, element):
         :param element: A protocol-specific handle to an element."""
         pass
 
+
 class SendKeysProtocolPart(ProtocolPart):
     """Protocol part for performing trusted clicks"""
     __metaclass__ = ABCMeta
@@ -280,6 +281,20 @@ def send_keys(self, element, keys):
         pass
 
 
+class GenerateTestReportProtocolPart(ProtocolPart):
+    """Protocol part for generating test reports"""
+    __metaclass__ = ABCMeta
+
+    name = "generate_test_report"
+
+    @abstractmethod
+    def generate_test_report(self, message):
+        """Generate a test report.
+
+        :param message: The message to be contained in the report."""
+        pass
+
+
 class ActionSequenceProtocolPart(ProtocolPart):
     """Protocol part for performing trusted clicks"""
     __metaclass__ = ABCMeta
diff --git a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/metadata.py b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/metadata.py
index 3a92491aa222..8699ac4fc734 100644
--- a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/metadata.py
+++ b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/metadata.py
@@ -365,7 +365,7 @@ def test_start(self, data):
 
         if self.ignore_existing:
             test_data.set_requires_update()
-            test_data.clear.append("expected")
+            test_data.clear.add("expected")
         self.tests_visited[test_id] = set()
 
     def test_status(self, data):
diff --git a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/testdriver-extra.js b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/testdriver-extra.js
index 6336d227db8d..09d7c2908671 100644
--- a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/testdriver-extra.js
+++ b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/testdriver-extra.js
@@ -90,4 +90,13 @@
         window.__wptrunner_message_queue.push({"type": "action", "action": "action_sequence", "actions": actions});
         return pending_promise;
     };
+
+    window.test_driver_internal.generate_test_report = function(message) {
+        const pending_promise = new Promise(function(resolve, reject) {
+            pending_resolve = resolve;
+            pending_reject = reject;
+        });
+        window.__wptrunner_message_queue.push({"type": "action", "action": "generate_test_report", "message": message});
+        return pending_promise;
+    };
 })();
diff --git a/tests/wpt/web-platform-tests/webdriver/tests/send_alert_text/conftest.py b/tests/wpt/web-platform-tests/webdriver/tests/send_alert_text/conftest.py
new file mode 100644
index 000000000000..f34630c3cbc5
--- /dev/null
+++ b/tests/wpt/web-platform-tests/webdriver/tests/send_alert_text/conftest.py
@@ -0,0 +1,24 @@
+import pytest
+
+from webdriver.error import NoSuchAlertException, NoSuchWindowException
+
+
+@pytest.fixture(name="session")
+def fixture_session(capabilities, session, create_window):
+    """Prevent dialog rate limits by running the test in a new window."""
+    original_handle = session.window_handle
+    session.window_handle = create_window()
+
+    yield session
+
+    try:
+        session.alert.dismiss()
+    except NoSuchAlertException:
+        pass
+
+    try:
+        session.close()
+    except NoSuchWindowException:
+        pass
+
+    session.window_handle = original_handle
diff --git a/tests/wpt/web-platform-tests/webxr/xrFrame_lifetime.https.html b/tests/wpt/web-platform-tests/webxr/xrFrame_lifetime.https.html
new file mode 100644
index 000000000000..971a6d78a1e1
--- /dev/null
+++ b/tests/wpt/web-platform-tests/webxr/xrFrame_lifetime.https.html
@@ -0,0 +1,55 @@
+<!DOCTYPE html>
+<body>
+  <script src=/resources/testharness.js></script>
+  <script src=/resources/testharnessreport.js></script>
+  <script src="resources/webxr_util.js"></script>
+  <canvas></canvas>
+
+  <script>
+    let immersiveTestName = "XRFrame methods throw exceptions outside of the " +
+      "requestAnimationFrame callback for immersive sessions";
+    let nonImmersiveTestName = "XRFrame methods throw exceptions outside of the " +
+      "requestAnimationFrame callback for non-immersive sessions";
+
+    let fakeDeviceInitParams = { supportsImmersive:true };
+
+    let immersiveSessionOptions = { mode: 'immersive-vr' };
+    let nonImmersiveSessionOptions = { outputContext: getOutputContext() };
+
+    let testFunction = (testSession, testController, t) => new Promise((resolve) => {
+      let staleFrame = null;
+      let currentReferenceSpace = null;
+
+      function onFrame(time, xrFrame) {
+        t.step(() => {
+          assert_true(xrFrame instanceof XRFrame);
+        });
+
+        staleFrame = xrFrame;
+        step_timeout(afterFrame, 0);
+      }
+
+      function afterFrame() {
+        t.step(() => {
+          // Attempting to call a method on the frame outside the callback that
+          // originally provided it should cause it to throw an exception.
+          assert_throws('InvalidStateError', () => staleFrame.getViewerPose(currentReferenceSpace));
+        });
+
+        // Test does not complete until the this function has executed.
+        resolve();
+      }
+
+      testSession.requestReferenceSpace({ type: 'stationary', subtype: 'eye-level' }).then((referenceSpace) => {
+        currentReferenceSpace = referenceSpace;
+        testSession.requestAnimationFrame(onFrame);
+      });
+    });
+
+    xr_session_promise_test(immersiveTestName, testFunction,
+      fakeDeviceInitParams, immersiveSessionOptions);
+    xr_session_promise_test(nonImmersiveTestName, testFunction,
+      fakeDeviceInitParams, nonImmersiveSessionOptions);
+
+  </script>
+</body>
\ No newline at end of file