diff --git a/tests/wpt/metadata/FileAPI/url/url-in-tags-revoke.window.js.ini b/tests/wpt/metadata/FileAPI/url/url-in-tags-revoke.window.js.ini
index a9e467132440..76b398963aee 100644
--- a/tests/wpt/metadata/FileAPI/url/url-in-tags-revoke.window.js.ini
+++ b/tests/wpt/metadata/FileAPI/url/url-in-tags-revoke.window.js.ini
@@ -7,7 +7,7 @@
     expected: FAIL
 
   [Opening a blob URL in a new window immediately before revoking it works.]
-    expected: TIMEOUT
+    expected: FAIL
 
   [Opening a blob URL in a noopener about:blank window immediately before revoking it works.]
     expected: FAIL
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 3a3d15b84062..947e223fb28f 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
@@ -14,9 +14,6 @@
   [Revoke blob URL after creating Request, will fetch]
     expected: FAIL
 
-  [Revoke blob URL after calling fetch, fetch should succeed]
-    expected: FAIL
-
 
 [url-with-fetch.any.html]
   [Untitled]
@@ -37,6 +34,3 @@
   [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 2d4dd5edc572..23de99261dde 100644
--- a/tests/wpt/metadata/MANIFEST.json
+++ b/tests/wpt/metadata/MANIFEST.json
@@ -361364,18 +361364,42 @@
      {}
     ]
    ],
+   "mathml/relations/css-styling/padding-border-margin/border-002.html": [
+    [
+     "mathml/relations/css-styling/padding-border-margin/border-002.html",
+     {}
+    ]
+   ],
    "mathml/relations/css-styling/padding-border-margin/margin-001.html": [
     [
      "mathml/relations/css-styling/padding-border-margin/margin-001.html",
      {}
     ]
    ],
+   "mathml/relations/css-styling/padding-border-margin/margin-002.html": [
+    [
+     "mathml/relations/css-styling/padding-border-margin/margin-002.html",
+     {}
+    ]
+   ],
    "mathml/relations/css-styling/padding-border-margin/padding-001.html": [
     [
      "mathml/relations/css-styling/padding-border-margin/padding-001.html",
      {}
     ]
    ],
+   "mathml/relations/css-styling/padding-border-margin/padding-002.html": [
+    [
+     "mathml/relations/css-styling/padding-border-margin/padding-002.html",
+     {}
+    ]
+   ],
+   "mathml/relations/css-styling/padding-border-margin/padding-003.html": [
+    [
+     "mathml/relations/css-styling/padding-border-margin/padding-003.html",
+     {}
+    ]
+   ],
    "mathml/relations/html5-tree/class-2.html": [
     [
      "mathml/relations/html5-tree/class-2.html",
@@ -640579,18 +640603,34 @@
    "8efb6a5ab0e6759fccbd9775da700d5065a3fdd7",
    "testharness"
   ],
+  "mathml/relations/css-styling/padding-border-margin/border-002.html": [
+   "4168c3cdb942d903598d50013443de041b019af2",
+   "testharness"
+  ],
   "mathml/relations/css-styling/padding-border-margin/helper.js": [
-   "8d8ac32f442d0593abeb16fa961dee479e22b552",
+   "d3f4b261a75ad7706edc65793bd15661aa866b47",
    "support"
   ],
   "mathml/relations/css-styling/padding-border-margin/margin-001.html": [
    "dc3a2b4a150d7b140cbc2339a04363a2a29e2e25",
    "testharness"
   ],
+  "mathml/relations/css-styling/padding-border-margin/margin-002.html": [
+   "8631be586e472965bcecdb955e6eb98de78415b5",
+   "testharness"
+  ],
   "mathml/relations/css-styling/padding-border-margin/padding-001.html": [
    "1f8875f657d0ce30719390fc0f6b7c28aae04c65",
    "testharness"
   ],
+  "mathml/relations/css-styling/padding-border-margin/padding-002.html": [
+   "eadff36b460565f175f135a40bff3b6cfea8ba21",
+   "testharness"
+  ],
+  "mathml/relations/css-styling/padding-border-margin/padding-003.html": [
+   "cad4a990b1d4993afaa36b240007a5ea1cfa925a",
+   "testharness"
+  ],
   "mathml/relations/css-styling/visibility-001-ref.html": [
    "fcaf5fe85b44129db71f82913374859380576369",
    "support"
@@ -640748,7 +640788,7 @@
    "support"
   ],
   "mathml/support/mathml-fragments.js": [
-   "5de537ca42af4a4763c5acf9307d2017214680db",
+   "3753c3460ec25a872d887db048ac3e708a12e69d",
    "support"
   ],
   "mathml/tools/axisheight.py": [
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 1b4ae9a29da9..62efd46733a2 100644
--- a/tests/wpt/metadata/fetch/content-type/response.window.js.ini
+++ b/tests/wpt/metadata/fetch/content-type/response.window.js.ini
@@ -315,21 +315,21 @@
   [<iframe>: combined response Content-Type: text/html;" text/plain]
     expected: FAIL
 
-  [<iframe>: separate response Content-Type: text/html */*]
+  [<iframe>: separate response Content-Type: text/plain */*]
     expected: FAIL
 
-  [<iframe>: combined response Content-Type: */* text/html]
+  [<iframe>: combined response Content-Type: text/html */*;charset=gbk]
     expected: FAIL
 
-  [<iframe>: separate response Content-Type: text/html */*;charset=gbk]
+  [<iframe>: combined response Content-Type: text/html;charset=gbk text/plain text/html]
     expected: FAIL
 
-  [<iframe>: separate response Content-Type: text/plain */*]
+  [<iframe>: combined response Content-Type: text/html */*]
     expected: FAIL
 
-  [<iframe>: combined response Content-Type: text/html */*;charset=gbk]
+  [<iframe>: combined response Content-Type: text/html;x=" text/plain]
     expected: FAIL
 
-  [<iframe>: combined response Content-Type: text/html;" \\" text/plain]
+  [<iframe>: separate response Content-Type: text/plain */*;charset=gbk]
     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 5c0015928591..e67f0406fc3d 100644
--- a/tests/wpt/metadata/fetch/content-type/script.window.js.ini
+++ b/tests/wpt/metadata/fetch/content-type/script.window.js.ini
@@ -53,9 +53,3 @@
   [combined text/javascript ]
     expected: FAIL
 
-  [separate text/javascript x/x]
-    expected: FAIL
-
-  [separate text/javascript;charset=windows-1252 error text/javascript]
-    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 536384f36e1c..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%2Cnosniff]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini
deleted file mode 100644
index 87b07c3e6704..000000000000
--- a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[traverse_the_history_1.html]
-  [Multiple history traversals from the same task]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_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/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/creating_browsing_context_test_01.html.ini b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/creating_browsing_context_test_01.html.ini
deleted file mode 100644
index dec4c579137c..000000000000
--- a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/creating_browsing_context_test_01.html.ini
+++ /dev/null
@@ -1,5 +0,0 @@
-[creating_browsing_context_test_01.html]
-  expected: TIMEOUT
-  [first argument: absolute url]
-    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-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-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-top.html.ini b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-top.html.ini
index 10f617db69e0..8540f53d8d69 100644
--- a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-top.html.ini
+++ b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-top.html.ini
@@ -1,32 +1,42 @@
 [open-features-non-integer-top.html]
   type: testharness
+  expected: TIMEOUT
   [HTML: window.open `features`: non-integer values for feature `top`]
     expected: FAIL
 
   [features "top=105/5" should set "top=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "top=105*3" should set "top=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "top=105LLl" should set "top=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "top=105e-1" should set "top=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "top=105.32" should set "top=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "top=105e1" should set "top=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "top=105  " should set "top=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "top=105^4" should set "top=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "top=105.5" should set "top=105"]
-    expected: FAIL
+    expected: TIMEOUT
+
+  [features "top=/104" should NOT set "top=104"]
+    expected: TIMEOUT
+
+  [features "top=_104" should NOT set "top=104"]
+    expected: TIMEOUT
+
+  [features "top=L104" should NOT set "top=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-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/html/semantics/forms/form-submission-0/form-submission-algorithm.html.ini b/tests/wpt/metadata/html/semantics/forms/form-submission-0/form-submission-algorithm.html.ini
index 127392316de4..702af61a3c4c 100644
--- a/tests/wpt/metadata/html/semantics/forms/form-submission-0/form-submission-algorithm.html.ini
+++ b/tests/wpt/metadata/html/semantics/forms/form-submission-0/form-submission-algorithm.html.ini
@@ -1,7 +1,11 @@
 [form-submission-algorithm.html]
+  expected: TIMEOUT
   [If form's firing submission events is true, then return; 'submit' event]
     expected: FAIL
 
   [If form's firing submission events is true, then return; 'invalid' event]
     expected: FAIL
 
+  [Cannot navigate (after constructing the entry list)]
+    expected: TIMEOUT
+
diff --git a/tests/wpt/metadata/html/semantics/interactive-elements/the-details-element/toggleEvent.html.ini b/tests/wpt/metadata/html/semantics/interactive-elements/the-details-element/toggleEvent.html.ini
deleted file mode 100644
index 9e522297c94d..000000000000
--- a/tests/wpt/metadata/html/semantics/interactive-elements/the-details-element/toggleEvent.html.ini
+++ /dev/null
@@ -1,7 +0,0 @@
-[toggleEvent.html]
-  [Calling open twice on 'details' fires only one toggle event]
-    expected: FAIL
-
-  [Setting open=true to opened 'details' element should not fire a toggle event at the 'details' element]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/resource-timing/resource_TAO_origin.htm.ini b/tests/wpt/metadata/resource-timing/resource_TAO_origin.htm.ini
index 5c59982f7907..5a549d938b6f 100644
--- a/tests/wpt/metadata/resource-timing/resource_TAO_origin.htm.ini
+++ b/tests/wpt/metadata/resource-timing/resource_TAO_origin.htm.ini
@@ -11,6 +11,3 @@
   [The iframe should have one resource timing entry.]
     expected: FAIL
 
-  [responseEnd should not be 0 in timing-allow cross-origin request.]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-fft-scaling.html.ini b/tests/wpt/metadata/webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-fft-scaling.html.ini
index 66bd350083b0..a56bad443a2d 100644
--- a/tests/wpt/metadata/webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-fft-scaling.html.ini
+++ b/tests/wpt/metadata/webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-fft-scaling.html.ini
@@ -1,4 +1,5 @@
 [realtimeanalyser-fft-scaling.html]
+  expected: TIMEOUT
   [X 2048-point FFT peak position is not equal to 64. Got 0.]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/webaudio/the-audio-api/the-audiobuffersourcenode-interface/sub-sample-buffer-stitching.html.ini b/tests/wpt/metadata/webaudio/the-audio-api/the-audiobuffersourcenode-interface/sub-sample-buffer-stitching.html.ini
index 6da130a36a46..98a49abc6aca 100644
--- a/tests/wpt/metadata/webaudio/the-audio-api/the-audiobuffersourcenode-interface/sub-sample-buffer-stitching.html.ini
+++ b/tests/wpt/metadata/webaudio/the-audio-api/the-audiobuffersourcenode-interface/sub-sample-buffer-stitching.html.ini
@@ -140,3 +140,9 @@
   [X SNR (-7.533841891306955 dB) is not greater than or equal to 65.737. Got -7.533841891306955.]
     expected: FAIL
 
+  [X Stitched sine-wave buffers at sample rate 43800 does not equal [0,0.06264832615852356,0.12505052983760834,0.18696144223213196,0.24813786149024963,0.308339387178421,0.36732959747314453,0.4248766601085663,0.480754554271698,0.5347436666488647,0.5866320133209229,0.6362156271934509,0.6832997798919678,0.7276994585990906,0.7692402601242065,0.8077589869499207...\] with an element-wise tolerance of {"absoluteThreshold":0.0038986,"relativeThreshold":0}.\n\tIndex\tActual\t\t\tExpected\t\tAbsError\t\tRelError\t\tTest threshold\n\t[30\]\t9.4836157560348511e-1\t9.5236867666244507e-1\t4.0071010589599609e-3\t4.2075103446311962e-3\t3.8985999999999999e-3\n\t[31\]\t9.2646563053131104e-1\t9.3139332532882690e-1\t4.9276947975158691e-3\t5.2906700783754857e-3\t3.8985999999999999e-3\n\t[32\]\t9.0087991952896118e-1\t9.0675884485244751e-1\t5.8789253234863281e-3\t6.4834496590358351e-3\t3.8985999999999999e-3\n\t[33\]\t8.7170630693435669e-1\t8.7856203317642212e-1\t6.8557262420654297e-3\t7.8033490899654511e-3\t3.8985999999999999e-3\n\t[34\]\t8.3906102180480957e-1\t8.4691369533538818e-1\t7.8526735305786133e-3\t9.2721059699818163e-3\t3.8985999999999999e-3\n\t...and 31036 more errors.\n\tMax AbsError of 9.8276454210281372e-1 at index of 39267.\n\t[39267\]\t7.7570681365122299e-38\t-9.8276454210281372e-1\t9.8276454210281372e-1\t1.0000000000000000e+0\t3.8985999999999999e-3\n\tMax RelError of 3.3137802965303198e+0 at index of 1253.\n\t[1253\]\t-4.3022233992815018e-2\t-9.9732093513011932e-3\t3.3049024641513824e-2\t3.3137802965303198e+0\t3.8985999999999999e-3\n]
+    expected: FAIL
+
+  [X SNR (NaN dB) is not greater than or equal to 65.737. Got NaN.]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/webxr/xrBoundedReferenceSpace_updates.https.html.ini b/tests/wpt/metadata/webxr/xrBoundedReferenceSpace_updates.https.html.ini
index 6ff00c31bef6..27f6c5ed7a22 100644
--- a/tests/wpt/metadata/webxr/xrBoundedReferenceSpace_updates.https.html.ini
+++ b/tests/wpt/metadata/webxr/xrBoundedReferenceSpace_updates.https.html.ini
@@ -1,5 +1,5 @@
 [xrBoundedReferenceSpace_updates.https.html]
-  expected: TIMEOUT
+  expected: ERROR
   ['XRBoundedReferenceSpace updates properly when the changes are applied]
     expected: TIMEOUT
 
diff --git a/tests/wpt/web-platform-tests/mathml/relations/css-styling/padding-border-margin/border-002.html b/tests/wpt/web-platform-tests/mathml/relations/css-styling/padding-border-margin/border-002.html
new file mode 100644
index 000000000000..4168c3cdb942
--- /dev/null
+++ b/tests/wpt/web-platform-tests/mathml/relations/css-styling/padding-border-margin/border-002.html
@@ -0,0 +1,51 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>border</title>
+<link rel="help" href="https://mathml-refresh.github.io/mathml-core/#layout-algorithms">
+<meta name="assert" content="Verify that border is taken into account.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/mathml/support/mathml-fragments.js"></script>
+<script src="helper.js"></script>
+<script>
+  var epsilon = 1;
+
+  setup({ explicit_done: true });
+  window.addEventListener("load", runTests);
+
+  function runTests() {
+
+    for (tag in MathMLFragments) {
+        if (!FragmentHelper.isValidChildOfMrow(tag))
+            continue;
+
+        var style = "border-left: 30px solid; border-right: 40px solid; border-top: 50px solid; border-bottom: 60px solid;";
+
+        if (FragmentHelper.isEmpty(tag)) {
+            test(function() {
+                var s = compareSizeWithAndWithoutStyle(tag, style);
+                assert_approx_equals(s.width_delta, 30 + 40, epsilon, "left/right border");
+                assert_approx_equals(s.height_delta, 50 + 60, epsilon, "top/bottom border");
+            }, `Border properties on ${tag}`);
+            continue;
+        }
+
+        test(function() {
+            var s = compareSpaceWithAndWithoutStyle(tag, style);
+            assert_approx_equals(s.left_delta, 30, epsilon, "left border");
+            assert_approx_equals(s.right_delta, 40, epsilon, "right border");
+            assert_approx_equals(s.top_delta, 50, epsilon, "top border");
+            assert_approx_equals(s.bottom_delta, 60, epsilon, "bottom border");
+        }, `Border properties on ${tag}`);
+    }
+
+    done();
+  }
+</script>
+</head>
+<body>
+  <div id="log"></div>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/mathml/relations/css-styling/padding-border-margin/helper.js b/tests/wpt/web-platform-tests/mathml/relations/css-styling/padding-border-margin/helper.js
index 8d8ac32f442d..d3f4b261a75a 100644
--- a/tests/wpt/web-platform-tests/mathml/relations/css-styling/padding-border-margin/helper.js
+++ b/tests/wpt/web-platform-tests/mathml/relations/css-styling/padding-border-margin/helper.js
@@ -1,12 +1,79 @@
+function spaceBetween(childBox, parentBox) {
+    return {
+        left: childBox.left - parentBox.left,
+        right: parentBox.right - childBox.right,
+        top: childBox.top - parentBox.top,
+        bottom: parentBox.bottom - childBox.bottom
+    };
+}
+
 function measureSpaceAround(id) {
     var mrow = document.getElementById(id);
     var mrowBox = mrow.getBoundingClientRect();
     var parentBox = mrow.parentNode.getBoundingClientRect();
     var childBox = mrow.firstElementChild.getBoundingClientRect();
+    return spaceBetween(childBox, parentBox);
+}
+
+function compareSpaceWithAndWithoutStyle(tag, style) {
+    if (!FragmentHelper.isValidChildOfMrow(tag) ||
+        FragmentHelper.isEmpty(tag))
+        throw `Invalid argument: ${tag}`;
+
+    document.body.insertAdjacentHTML("beforeend", `<div>\
+<math>${MathMLFragments[tag]}</math>\
+<math>${MathMLFragments[tag]}</math>\
+</div>`);
+    var div = document.body.lastElementChild;
+
+    var styleMath = div.firstElementChild;
+    var styleElement = FragmentHelper.element(styleMath);
+    styleElement.setAttribute("style", style);
+    var styleChild = FragmentHelper.forceNonEmptyElement(styleElement);
+    var styleBox = styleMath.getBoundingClientRect();
+    var styleChildBox = styleChild.getBoundingClientRect();
+    var styleSpace = spaceBetween(styleChildBox, styleBox);
+
+    var noStyleMath = div.lastElementChild;
+    var noStyleElement = FragmentHelper.element(noStyleMath);
+    var noStyleChild = FragmentHelper.forceNonEmptyElement(noStyleElement);
+    var noStyleBox = noStyleMath.getBoundingClientRect();
+    var noStyleChildBox = noStyleChild.getBoundingClientRect();
+    var noStyleSpace = spaceBetween(noStyleChildBox, noStyleBox);
+
+    div.style = "display: none;"; // Hide the div after measurement.
+
     return {
-        left: childBox.left - parentBox.left,
-        right: parentBox.right - childBox.right,
-        top: childBox.top - parentBox.top,
-        bottom: parentBox.bottom - childBox.bottom
+        left_delta: styleSpace.left - noStyleSpace.left,
+        right_delta: styleSpace.right - noStyleSpace.right,
+        top_delta: styleSpace.top - noStyleSpace.top,
+        bottom_delta: styleSpace.bottom - noStyleSpace.bottom
     };
 }
+
+function compareSizeWithAndWithoutStyle(tag, style) {
+    if (!FragmentHelper.isValidChildOfMrow(tag))
+        throw `Invalid argument: ${tag}`;
+
+    document.body.insertAdjacentHTML("beforeend", `<div>\
+<math>${MathMLFragments[tag]}</math>\
+<math>${MathMLFragments[tag]}</math>\
+</div>`);
+    var div = document.body.lastElementChild;
+
+    var styleMath = div.firstElementChild;
+    var styleElement = FragmentHelper.element(styleMath);
+    styleElement.setAttribute("style", style);
+    var styleBox = styleMath.getBoundingClientRect();
+
+    var noStyleMath = div.lastElementChild;
+    var noStyleElement = FragmentHelper.element(noStyleMath);
+    var noStyleBox = noStyleMath.getBoundingClientRect();
+
+    div.style = "display: none;"; // Hide the div after measurement.
+
+    return {
+        width_delta: styleBox.width - noStyleBox.width,
+        height_delta: styleBox.height - noStyleBox.height
+    };
+};
diff --git a/tests/wpt/web-platform-tests/mathml/relations/css-styling/padding-border-margin/margin-002.html b/tests/wpt/web-platform-tests/mathml/relations/css-styling/padding-border-margin/margin-002.html
new file mode 100644
index 000000000000..8631be586e47
--- /dev/null
+++ b/tests/wpt/web-platform-tests/mathml/relations/css-styling/padding-border-margin/margin-002.html
@@ -0,0 +1,51 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>margin</title>
+<link rel="help" href="https://mathml-refresh.github.io/mathml-core/#layout-algorithms">
+<meta name="assert" content="Verify that margin is taken into account.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/mathml/support/mathml-fragments.js"></script>
+<script src="helper.js"></script>
+<script>
+  var epsilon = 1;
+
+  setup({ explicit_done: true });
+  window.addEventListener("load", runTests);
+
+  function runTests() {
+
+    for (tag in MathMLFragments) {
+        if (!FragmentHelper.isValidChildOfMrow(tag))
+            continue;
+
+        var style = "margin-left: 30px; margin-right: 40px;  margin-top: 50px; margin-bottom: 60px;";
+
+        if (FragmentHelper.isEmpty(tag)) {
+            test(function() {
+                var s = compareSizeWithAndWithoutStyle(tag, style);
+                assert_approx_equals(s.width_delta, 30 + 40, epsilon, "left/right margin");
+                assert_approx_equals(s.height_delta, 50 + 60, epsilon, "top/bottom margin");
+            }, `Margin properties on ${tag}`);
+            continue;
+        }
+
+        test(function() {
+            var s = compareSpaceWithAndWithoutStyle(tag, style);
+            assert_approx_equals(s.left_delta, 30, epsilon, "left margin");
+            assert_approx_equals(s.right_delta, 40, epsilon, "right margin");
+            assert_approx_equals(s.top_delta, 50, epsilon, "top margin");
+            assert_approx_equals(s.bottom_delta, 60, epsilon, "bottom margin");
+        }, `Margin properties on ${tag}`);
+    }
+
+    done();
+  }
+</script>
+</head>
+<body>
+  <div id="log"></div>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/mathml/relations/css-styling/padding-border-margin/padding-002.html b/tests/wpt/web-platform-tests/mathml/relations/css-styling/padding-border-margin/padding-002.html
new file mode 100644
index 000000000000..eadff36b4605
--- /dev/null
+++ b/tests/wpt/web-platform-tests/mathml/relations/css-styling/padding-border-margin/padding-002.html
@@ -0,0 +1,51 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>padding</title>
+<link rel="help" href="https://mathml-refresh.github.io/mathml-core/#layout-algorithms">
+<meta name="assert" content="Verify that padding is taken into account.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/mathml/support/mathml-fragments.js"></script>
+<script src="helper.js"></script>
+<script>
+  var epsilon = 1;
+
+  setup({ explicit_done: true });
+  window.addEventListener("load", runTests);
+
+  function runTests() {
+
+    for (tag in MathMLFragments) {
+        if (!FragmentHelper.isValidChildOfMrow(tag))
+            continue;
+
+        var style = "padding-left: 30px; padding-right: 40px;  padding-top: 50px; padding-bottom: 60px;";
+
+        if (FragmentHelper.isEmpty(tag)) {
+            test(function() {
+                var s = compareSizeWithAndWithoutStyle(tag, style);
+                assert_approx_equals(s.width_delta, 30 + 40, epsilon, "left/right padding");
+                assert_approx_equals(s.height_delta, 50 + 60, epsilon, "top/bottom padding");
+            }, `Padding properties on ${tag}`);
+            continue;
+        }
+
+        test(function() {
+            var s = compareSpaceWithAndWithoutStyle(tag, style);
+            assert_approx_equals(s.left_delta, 30, epsilon, "left padding");
+            assert_approx_equals(s.right_delta, 40, epsilon, "right padding");
+            assert_approx_equals(s.top_delta, 50, epsilon, "top padding");
+            assert_approx_equals(s.bottom_delta, 60, epsilon, "bottom padding");
+        }, `Padding properties on ${tag}`);
+    }
+
+    done();
+  }
+</script>
+</head>
+<body>
+  <div id="log"></div>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/mathml/relations/css-styling/padding-border-margin/padding-003.html b/tests/wpt/web-platform-tests/mathml/relations/css-styling/padding-border-margin/padding-003.html
new file mode 100644
index 000000000000..cad4a990b1d4
--- /dev/null
+++ b/tests/wpt/web-platform-tests/mathml/relations/css-styling/padding-border-margin/padding-003.html
@@ -0,0 +1,39 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>padding</title>
+<link rel="help" href="https://mathml-refresh.github.io/mathml-core/#layout-algorithms">
+<meta name="assert" content="Verify that padding is taken into account.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/mathml/support/mathml-fragments.js"></script>
+<script src="helper.js"></script>
+<script>
+  var epsilon = 1;
+
+  setup({ explicit_done: true });
+  window.addEventListener("load", runTests);
+
+  function runTests() {
+
+    for (tag in MathMLFragments) {
+        if (!FragmentHelper.isEmpty(tag))
+            continue;
+
+        test(function() {
+            var style = "padding-left: 10px; padding-right: 20px;  padding-top: 15px; padding-bottom: 25px;";
+            var s = compareSizeWithAndWithoutStyle(tag, style);
+            assert_approx_equals(s.width_delta, 10 + 20, epsilon, "padding left/right");
+            assert_approx_equals(s.height_delta, 15 + 25, epsilon, "padding top/bottom");
+        }, `Padding properties on ${tag}`);
+    }
+
+    done();
+  }
+</script>
+</head>
+<body>
+  <div id="log"></div>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/mathml/support/mathml-fragments.js b/tests/wpt/web-platform-tests/mathml/support/mathml-fragments.js
index 5de537ca42af..3753c3460ec2 100644
--- a/tests/wpt/web-platform-tests/mathml/support/mathml-fragments.js
+++ b/tests/wpt/web-platform-tests/mathml/support/mathml-fragments.js
@@ -110,8 +110,42 @@ var MathMLFragments = {
   <mrow class='mathml-container'></mrow>\
 </mmultiscripts>",
     "semantics": "\
-<semantics class='element>\
+<semantics class='element'>\
   <mrow class='mathml-container'></mrow>\
   <annotation class='text-container'></annotation>\
 </semantics>"
 };
+
+var FragmentHelper = {
+    createElement: function(tag) {
+        return document.createElementNS("http://www.w3.org/1998/Math/MathML", tag);
+    },
+
+    isValidChildOfMrow: function(tag) {
+        return !(tag == "annotation" ||
+                 tag == "annotation-xml" ||
+                 tag == "mprescripts" ||
+                 tag == "none" ||
+                 tag == "mtr" ||
+                 tag == "mtd");
+    },
+
+    isEmpty: function(tag) {
+        return tag === "mspace" || tag == "mprescripts" || tag == "none";
+    },
+
+    element: function(fragment) {
+        return fragment.getElementsByClassName('element')[0];
+    },
+
+    forceNonEmptyElement: function(fragment) {
+        var element = this.element(fragment) || fragment;
+        if (element.firstElementChild)
+            return element.firstElementChild;
+        if (element.classList.contains("mathml-container"))
+            return element.appendChild(this.createElement("mrow"));
+        if (element.classList.contains("foreign-container"))
+            return element.appendChild(document.createElement("span"));
+        throw "Cannot make the element nonempty";
+    }
+}