diff --git a/tests/wpt/meta-legacy-layout/WebCryptoAPI/import_export/okp_importKey.https.any.js.ini b/tests/wpt/meta-legacy-layout/WebCryptoAPI/import_export/okp_importKey.https.any.js.ini
index ed0fd4312df..4c3061e29a5 100644
--- a/tests/wpt/meta-legacy-layout/WebCryptoAPI/import_export/okp_importKey.https.any.js.ini
+++ b/tests/wpt/meta-legacy-layout/WebCryptoAPI/import_export/okp_importKey.https.any.js.ini
@@ -287,6 +287,66 @@
   [Good parameters: X448 bits (jwk, object(crv, d, x, kty), {name: X448}, false, [deriveKey, deriveBits, deriveKey, deriveBits\])]
     expected: FAIL
 
+  [Good parameters with ignored JWK alg: Ed25519 (jwk, object(kty, crv, x), {name: Ed25519}, true, [verify\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: Ed25519 (jwk, object(kty, crv, x), {name: Ed25519}, true, [\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: Ed25519 (jwk, object(kty, crv, x), {name: Ed25519}, true, [verify, verify\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: Ed25519 (jwk, object(crv, d, x, kty), {name: Ed25519}, true, [sign\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: Ed25519 (jwk, object(crv, d, x, kty), {name: Ed25519}, true, [sign, sign\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: Ed448 (jwk, object(kty, crv, x), {name: Ed448}, true, [verify\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: Ed448 (jwk, object(kty, crv, x), {name: Ed448}, true, [\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: Ed448 (jwk, object(kty, crv, x), {name: Ed448}, true, [verify, verify\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: Ed448 (jwk, object(crv, d, x, kty), {name: Ed448}, true, [sign\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: Ed448 (jwk, object(crv, d, x, kty), {name: Ed448}, true, [sign, sign\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: X25519 (jwk, object(kty, crv, x), {name: X25519}, true, [\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: X25519 (jwk, object(crv, d, x, kty), {name: X25519}, true, [deriveKey\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: X25519 (jwk, object(crv, d, x, kty), {name: X25519}, true, [deriveBits, deriveKey\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: X25519 (jwk, object(crv, d, x, kty), {name: X25519}, true, [deriveBits\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: X25519 (jwk, object(crv, d, x, kty), {name: X25519}, true, [deriveKey, deriveBits, deriveKey, deriveBits\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: X448 (jwk, object(kty, crv, x), {name: X448}, true, [\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: X448 (jwk, object(crv, d, x, kty), {name: X448}, true, [deriveKey\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: X448 (jwk, object(crv, d, x, kty), {name: X448}, true, [deriveBits, deriveKey\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: X448 (jwk, object(crv, d, x, kty), {name: X448}, true, [deriveBits\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: X448 (jwk, object(crv, d, x, kty), {name: X448}, true, [deriveKey, deriveBits, deriveKey, deriveBits\])]
+    expected: FAIL
+
 
 [okp_importKey.https.any.worker.html]
   [Good parameters: Ed25519 bits (spki, buffer(44), {name: Ed25519}, true, [\])]
@@ -576,3 +636,63 @@
 
   [Good parameters: X448 bits (jwk, object(crv, d, x, kty), {name: X448}, false, [deriveKey, deriveBits, deriveKey, deriveBits\])]
     expected: FAIL
+
+  [Good parameters with ignored JWK alg: Ed25519 (jwk, object(kty, crv, x), {name: Ed25519}, true, [verify\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: Ed25519 (jwk, object(kty, crv, x), {name: Ed25519}, true, [\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: Ed25519 (jwk, object(kty, crv, x), {name: Ed25519}, true, [verify, verify\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: Ed25519 (jwk, object(crv, d, x, kty), {name: Ed25519}, true, [sign\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: Ed25519 (jwk, object(crv, d, x, kty), {name: Ed25519}, true, [sign, sign\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: Ed448 (jwk, object(kty, crv, x), {name: Ed448}, true, [verify\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: Ed448 (jwk, object(kty, crv, x), {name: Ed448}, true, [\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: Ed448 (jwk, object(kty, crv, x), {name: Ed448}, true, [verify, verify\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: Ed448 (jwk, object(crv, d, x, kty), {name: Ed448}, true, [sign\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: Ed448 (jwk, object(crv, d, x, kty), {name: Ed448}, true, [sign, sign\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: X25519 (jwk, object(kty, crv, x), {name: X25519}, true, [\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: X25519 (jwk, object(crv, d, x, kty), {name: X25519}, true, [deriveKey\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: X25519 (jwk, object(crv, d, x, kty), {name: X25519}, true, [deriveBits, deriveKey\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: X25519 (jwk, object(crv, d, x, kty), {name: X25519}, true, [deriveBits\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: X25519 (jwk, object(crv, d, x, kty), {name: X25519}, true, [deriveKey, deriveBits, deriveKey, deriveBits\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: X448 (jwk, object(kty, crv, x), {name: X448}, true, [\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: X448 (jwk, object(crv, d, x, kty), {name: X448}, true, [deriveKey\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: X448 (jwk, object(crv, d, x, kty), {name: X448}, true, [deriveBits, deriveKey\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: X448 (jwk, object(crv, d, x, kty), {name: X448}, true, [deriveBits\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: X448 (jwk, object(crv, d, x, kty), {name: X448}, true, [deriveKey, deriveBits, deriveKey, deriveBits\])]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/css-align/parsing/align-tracks-computed.html.ini b/tests/wpt/meta-legacy-layout/css/css-align/parsing/align-tracks-computed.html.ini
deleted file mode 100644
index e63929a5b30..00000000000
--- a/tests/wpt/meta-legacy-layout/css/css-align/parsing/align-tracks-computed.html.ini
+++ /dev/null
@@ -1,45 +0,0 @@
-[align-tracks-computed.html]
-  [Property align-tracks value 'normal']
-    expected: FAIL
-
-  [Property align-tracks value 'baseline']
-    expected: FAIL
-
-  [Property align-tracks value 'last baseline']
-    expected: FAIL
-
-  [Property align-tracks value 'space-between']
-    expected: FAIL
-
-  [Property align-tracks value 'space-around']
-    expected: FAIL
-
-  [Property align-tracks value 'space-evenly']
-    expected: FAIL
-
-  [Property align-tracks value 'stretch']
-    expected: FAIL
-
-  [Property align-tracks value 'center']
-    expected: FAIL
-
-  [Property align-tracks value 'start']
-    expected: FAIL
-
-  [Property align-tracks value 'end']
-    expected: FAIL
-
-  [Property align-tracks value 'flex-start']
-    expected: FAIL
-
-  [Property align-tracks value 'flex-end']
-    expected: FAIL
-
-  [Property align-tracks value 'unsafe end']
-    expected: FAIL
-
-  [Property align-tracks value 'safe flex-start']
-    expected: FAIL
-
-  [Property align-tracks value 'normal, normal']
-    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/css-align/parsing/align-tracks-valid.html.ini b/tests/wpt/meta-legacy-layout/css/css-align/parsing/align-tracks-valid.html.ini
deleted file mode 100644
index cbe763cc151..00000000000
--- a/tests/wpt/meta-legacy-layout/css/css-align/parsing/align-tracks-valid.html.ini
+++ /dev/null
@@ -1,54 +0,0 @@
-[align-tracks-valid.html]
-  [e.style['align-tracks'\] = "normal" should set the property value]
-    expected: FAIL
-
-  [e.style['align-tracks'\] = "baseline" should set the property value]
-    expected: FAIL
-
-  [e.style['align-tracks'\] = "first baseline" should set the property value]
-    expected: FAIL
-
-  [e.style['align-tracks'\] = "last baseline" should set the property value]
-    expected: FAIL
-
-  [e.style['align-tracks'\] = "space-between" should set the property value]
-    expected: FAIL
-
-  [e.style['align-tracks'\] = "space-around" should set the property value]
-    expected: FAIL
-
-  [e.style['align-tracks'\] = "space-evenly" should set the property value]
-    expected: FAIL
-
-  [e.style['align-tracks'\] = "stretch" should set the property value]
-    expected: FAIL
-
-  [e.style['align-tracks'\] = "center" should set the property value]
-    expected: FAIL
-
-  [e.style['align-tracks'\] = "start" should set the property value]
-    expected: FAIL
-
-  [e.style['align-tracks'\] = "end" should set the property value]
-    expected: FAIL
-
-  [e.style['align-tracks'\] = "flex-start" should set the property value]
-    expected: FAIL
-
-  [e.style['align-tracks'\] = "flex-end" should set the property value]
-    expected: FAIL
-
-  [e.style['align-tracks'\] = "unsafe end" should set the property value]
-    expected: FAIL
-
-  [e.style['align-tracks'\] = "safe flex-start" should set the property value]
-    expected: FAIL
-
-  [e.style['align-tracks'\] = "flex-start, last baseline" should set the property value]
-    expected: FAIL
-
-  [e.style['align-tracks'\] = "normal, normal" should set the property value]
-    expected: FAIL
-
-  [e.style['align-tracks'\] = "start, flex-end, flex-end, flex-end, flex-end" should set the property value]
-    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/css-align/parsing/justify-tracks-computed.html.ini b/tests/wpt/meta-legacy-layout/css/css-align/parsing/justify-tracks-computed.html.ini
deleted file mode 100644
index c5b835863d7..00000000000
--- a/tests/wpt/meta-legacy-layout/css/css-align/parsing/justify-tracks-computed.html.ini
+++ /dev/null
@@ -1,45 +0,0 @@
-[justify-tracks-computed.html]
-  [Property justify-tracks value 'normal']
-    expected: FAIL
-
-  [Property justify-tracks value 'space-between']
-    expected: FAIL
-
-  [Property justify-tracks value 'space-around']
-    expected: FAIL
-
-  [Property justify-tracks value 'space-evenly']
-    expected: FAIL
-
-  [Property justify-tracks value 'stretch']
-    expected: FAIL
-
-  [Property justify-tracks value 'center']
-    expected: FAIL
-
-  [Property justify-tracks value 'start']
-    expected: FAIL
-
-  [Property justify-tracks value 'end']
-    expected: FAIL
-
-  [Property justify-tracks value 'flex-start']
-    expected: FAIL
-
-  [Property justify-tracks value 'flex-end']
-    expected: FAIL
-
-  [Property justify-tracks value 'unsafe end']
-    expected: FAIL
-
-  [Property justify-tracks value 'safe flex-start']
-    expected: FAIL
-
-  [Property justify-tracks value 'left']
-    expected: FAIL
-
-  [Property justify-tracks value 'unsafe right']
-    expected: FAIL
-
-  [Property justify-tracks value 'normal, normal']
-    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/css-align/parsing/justify-tracks-valid.html.ini b/tests/wpt/meta-legacy-layout/css/css-align/parsing/justify-tracks-valid.html.ini
deleted file mode 100644
index 641b10fa7bd..00000000000
--- a/tests/wpt/meta-legacy-layout/css/css-align/parsing/justify-tracks-valid.html.ini
+++ /dev/null
@@ -1,51 +0,0 @@
-[justify-tracks-valid.html]
-  [e.style['justify-tracks'\] = "normal" should set the property value]
-    expected: FAIL
-
-  [e.style['justify-tracks'\] = "space-between" should set the property value]
-    expected: FAIL
-
-  [e.style['justify-tracks'\] = "space-around" should set the property value]
-    expected: FAIL
-
-  [e.style['justify-tracks'\] = "space-evenly" should set the property value]
-    expected: FAIL
-
-  [e.style['justify-tracks'\] = "stretch" should set the property value]
-    expected: FAIL
-
-  [e.style['justify-tracks'\] = "center" should set the property value]
-    expected: FAIL
-
-  [e.style['justify-tracks'\] = "start" should set the property value]
-    expected: FAIL
-
-  [e.style['justify-tracks'\] = "end" should set the property value]
-    expected: FAIL
-
-  [e.style['justify-tracks'\] = "flex-start" should set the property value]
-    expected: FAIL
-
-  [e.style['justify-tracks'\] = "flex-end" should set the property value]
-    expected: FAIL
-
-  [e.style['justify-tracks'\] = "unsafe end" should set the property value]
-    expected: FAIL
-
-  [e.style['justify-tracks'\] = "safe flex-start" should set the property value]
-    expected: FAIL
-
-  [e.style['justify-tracks'\] = "left" should set the property value]
-    expected: FAIL
-
-  [e.style['justify-tracks'\] = "unsafe right" should set the property value]
-    expected: FAIL
-
-  [e.style['justify-tracks'\] = "flex-start, last baseline" should set the property value]
-    expected: FAIL
-
-  [e.style['justify-tracks'\] = "normal, normal" should set the property value]
-    expected: FAIL
-
-  [e.style['justify-tracks'\] = "start, flex-end, flex-end, flex-end, flex-end" should set the property value]
-    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/css-backgrounds/border-image-repeat-002.htm.ini b/tests/wpt/meta-legacy-layout/css/css-backgrounds/border-image-repeat-002.htm.ini
new file mode 100644
index 00000000000..fb4031b3d52
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/css/css-backgrounds/border-image-repeat-002.htm.ini
@@ -0,0 +1,2 @@
+[border-image-repeat-002.htm]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/css-backgrounds/border-image-repeat-004.htm.ini b/tests/wpt/meta-legacy-layout/css/css-backgrounds/border-image-repeat-004.htm.ini
new file mode 100644
index 00000000000..7ae2c899b70
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/css/css-backgrounds/border-image-repeat-004.htm.ini
@@ -0,0 +1,2 @@
+[border-image-repeat-004.htm]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/css-color/light-dark-basic.html.ini b/tests/wpt/meta-legacy-layout/css/css-color/light-dark-basic.html.ini
new file mode 100644
index 00000000000..e04d692f0eb
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/css/css-color/light-dark-basic.html.ini
@@ -0,0 +1,6 @@
+[light-dark-basic.html]
+  [light-dark(white, black)]
+    expected: FAIL
+
+  [light-dark(light-dark(white, red), red)]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/css-color/light-dark-currentcolor.html.ini b/tests/wpt/meta-legacy-layout/css/css-color/light-dark-currentcolor.html.ini
new file mode 100644
index 00000000000..669af6d8ea5
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/css/css-color/light-dark-currentcolor.html.ini
@@ -0,0 +1,2 @@
+[light-dark-currentcolor.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/css-color/light-dark-inheritance.html.ini b/tests/wpt/meta-legacy-layout/css/css-color/light-dark-inheritance.html.ini
new file mode 100644
index 00000000000..bf8493daf3a
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/css/css-color/light-dark-inheritance.html.ini
@@ -0,0 +1,2 @@
+[light-dark-inheritance.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/css-flexbox/abspos/position-absolute-013.html.ini b/tests/wpt/meta-legacy-layout/css/css-flexbox/abspos/position-absolute-013.html.ini
index 2b2e0fce8eb..80111fb0236 100644
--- a/tests/wpt/meta-legacy-layout/css/css-flexbox/abspos/position-absolute-013.html.ini
+++ b/tests/wpt/meta-legacy-layout/css/css-flexbox/abspos/position-absolute-013.html.ini
@@ -1,5 +1,4 @@
 [position-absolute-013.html]
-  expected: TIMEOUT
   [.flexbox 309]
     expected: FAIL
 
diff --git a/tests/wpt/meta-legacy-layout/css/css-text/text-spacing-trim/text-spacing-trim-combinations-001.html.ini b/tests/wpt/meta-legacy-layout/css/css-text/text-spacing-trim/text-spacing-trim-combinations-001.html.ini
deleted file mode 100644
index 52b0d0166bc..00000000000
--- a/tests/wpt/meta-legacy-layout/css/css-text/text-spacing-trim/text-spacing-trim-combinations-001.html.ini
+++ /dev/null
@@ -1,27 +0,0 @@
-[text-spacing-trim-combinations-001.html]
-  ["国（（国"]
-    expected: FAIL
-
-  ["国・（国"]
-    expected: FAIL
-
-  ["国）（国"]
-    expected: FAIL
-
-  ["国　（国"]
-    expected: FAIL
-
-  ["国））国"]
-    expected: FAIL
-
-  ["国）・国"]
-    expected: FAIL
-
-  ["国）　国"]
-    expected: FAIL
-
-  ["国（（（国"]
-    expected: FAIL
-
-  ["国）））国"]
-    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/css-text/white-space/trailing-other-space-separators-break-spaces-004.html.ini b/tests/wpt/meta-legacy-layout/css/css-text/white-space/trailing-other-space-separators-break-spaces-004.html.ini
deleted file mode 100644
index 3257d1b4d49..00000000000
--- a/tests/wpt/meta-legacy-layout/css/css-text/white-space/trailing-other-space-separators-break-spaces-004.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[trailing-other-space-separators-break-spaces-004.html]
-  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/css-ui/parsing/form-sizing-computed.html.ini b/tests/wpt/meta-legacy-layout/css/css-ui/parsing/form-sizing-computed.html.ini
index 39141cebc56..25c7ccdbe18 100644
--- a/tests/wpt/meta-legacy-layout/css/css-ui/parsing/form-sizing-computed.html.ini
+++ b/tests/wpt/meta-legacy-layout/css/css-ui/parsing/form-sizing-computed.html.ini
@@ -4,3 +4,9 @@
 
   [Property form-sizing value 'normal']
     expected: FAIL
+
+  [Property form-sizing value 'fixed']
+    expected: FAIL
+
+  [Property form-sizing value 'content']
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/css-ui/parsing/form-sizing-valid.html.ini b/tests/wpt/meta-legacy-layout/css/css-ui/parsing/form-sizing-valid.html.ini
index cda7dbed687..a31eb2c5cb0 100644
--- a/tests/wpt/meta-legacy-layout/css/css-ui/parsing/form-sizing-valid.html.ini
+++ b/tests/wpt/meta-legacy-layout/css/css-ui/parsing/form-sizing-valid.html.ini
@@ -4,3 +4,9 @@
 
   [e.style['form-sizing'\] = "normal" should set the property value]
     expected: FAIL
+
+  [e.style['form-sizing'\] = "fixed" should set the property value]
+    expected: FAIL
+
+  [e.style['form-sizing'\] = "content" should set the property value]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/cssom-view/MediaQueryList-extends-EventTarget.html.ini b/tests/wpt/meta-legacy-layout/css/cssom-view/MediaQueryList-extends-EventTarget.html.ini
new file mode 100644
index 00000000000..3fc2e24da01
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/css/cssom-view/MediaQueryList-extends-EventTarget.html.ini
@@ -0,0 +1,3 @@
+[MediaQueryList-extends-EventTarget.html]
+  [onchange removes listener]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/cssom-view/offsetTopLeft-border-box.html.ini b/tests/wpt/meta-legacy-layout/css/cssom-view/offsetTopLeft-border-box.html.ini
new file mode 100644
index 00000000000..00753fab1d1
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/css/cssom-view/offsetTopLeft-border-box.html.ini
@@ -0,0 +1,6 @@
+[offsetTopLeft-border-box.html]
+  [container: 0]
+    expected: FAIL
+
+  [container: 1]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/selectors/is-where-parsing.html.ini b/tests/wpt/meta-legacy-layout/css/selectors/is-where-parsing.html.ini
index dae62bf6253..83f85b33d30 100644
--- a/tests/wpt/meta-legacy-layout/css/selectors/is-where-parsing.html.ini
+++ b/tests/wpt/meta-legacy-layout/css/selectors/is-where-parsing.html.ini
@@ -40,3 +40,99 @@
 
   [Pseudo-elements inside]
     expected: FAIL
+
+  [":is(div )" should be a valid selector]
+    expected: FAIL
+
+  [":where(div )" should be a valid selector]
+    expected: FAIL
+
+  [":is(div + bar, div ~ .baz)" should be a valid selector]
+    expected: FAIL
+
+  [":where(div + bar, div ~ .baz)" should be a valid selector]
+    expected: FAIL
+
+  [":is(:is(div))" should be a valid selector]
+    expected: FAIL
+
+  [":where(:is(div))" should be a valid selector]
+    expected: FAIL
+
+  [":is(:where(div))" should be a valid selector]
+    expected: FAIL
+
+  [":where(:where(div))" should be a valid selector]
+    expected: FAIL
+
+  [":host(:is(div))" should be a valid selector]
+    expected: FAIL
+
+  [":host(:where(div))" should be a valid selector]
+    expected: FAIL
+
+  [":host(:is(div ))" should be a valid selector]
+    expected: FAIL
+
+  [":host(:where(div ))" should be a valid selector]
+    expected: FAIL
+
+  [":host(:is(div .foo))" should be a valid selector]
+    expected: FAIL
+
+  [":host(:where(div .foo))" should be a valid selector]
+    expected: FAIL
+
+  [":is(:hover, :active)" should be a valid selector]
+    expected: FAIL
+
+  [":where(:hover, :active)" should be a valid selector]
+    expected: FAIL
+
+  [":is(div):hover" should be a valid selector]
+    expected: FAIL
+
+  [":where(div):hover" should be a valid selector]
+    expected: FAIL
+
+  [":is(div)::before" should be a valid selector]
+    expected: FAIL
+
+  [":where(div)::before" should be a valid selector]
+    expected: FAIL
+
+  [":is(::before)" should be a valid selector]
+    expected: FAIL
+
+  [":where(::before)" should be a valid selector]
+    expected: FAIL
+
+  [":is(div) + bar" should be a valid selector]
+    expected: FAIL
+
+  [":where(div) + bar" should be a valid selector]
+    expected: FAIL
+
+  ["::part(foo):is(:hover)" should be a valid selector]
+    expected: FAIL
+
+  ["::part(foo):where(:hover)" should be a valid selector]
+    expected: FAIL
+
+  ["::part(foo):is([attr='value'\])" should be a valid selector]
+    expected: FAIL
+
+  ["::part(foo):where([attr='value'\])" should be a valid selector]
+    expected: FAIL
+
+  [":not(:is(div))" should be a valid selector]
+    expected: FAIL
+
+  [":not(:where(div))" should be a valid selector]
+    expected: FAIL
+
+  [":not(:is(div .foo))" should be a valid selector]
+    expected: FAIL
+
+  [":not(:where(div .foo))" should be a valid selector]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/selectors/parsing/parse-has-disallow-nesting-has-inside-has.html.ini b/tests/wpt/meta-legacy-layout/css/selectors/parsing/parse-has-disallow-nesting-has-inside-has.html.ini
index 7b4af3d0cd3..6d4e77b234b 100644
--- a/tests/wpt/meta-legacy-layout/css/selectors/parsing/parse-has-disallow-nesting-has-inside-has.html.ini
+++ b/tests/wpt/meta-legacy-layout/css/selectors/parsing/parse-has-disallow-nesting-has-inside-has.html.ini
@@ -16,3 +16,9 @@
 
   [CSS Selectors: The relational pseudo-class (disallow nesting :has() inside :has())]
     expected: FAIL
+
+  [":has(:is(:has(*)))" should be a valid selector]
+    expected: FAIL
+
+  [":has(:where(:has(*)))" should be a valid selector]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/dom/observable/tentative/observable-constructor.any.js.ini b/tests/wpt/meta-legacy-layout/dom/observable/tentative/observable-constructor.any.js.ini
new file mode 100644
index 00000000000..5eb54f20977
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/dom/observable/tentative/observable-constructor.any.js.ini
@@ -0,0 +1,80 @@
+[observable-constructor.any.worker.html]
+  [Observable constructor]
+    expected: FAIL
+
+  [Subscriber interface is not constructible]
+    expected: FAIL
+
+  [subscribe() can be called with no arguments]
+    expected: FAIL
+
+  [Observable constructor calls initializer on subscribe]
+    expected: FAIL
+
+  [Observable error path called synchronously]
+    expected: FAIL
+
+  [Observable should error if initializer throws]
+    expected: FAIL
+
+  [Subscription does not emit values after completion]
+    expected: FAIL
+
+  [Subscription does not emit values after error]
+    expected: FAIL
+
+  [Completing or nexting a subscriber after an error does nothing]
+    expected: FAIL
+
+  [Errors pushed to the subscriber that are not handled by the subscription are reported to the global]
+    expected: FAIL
+
+  [Errors thrown in the initializer that are not handled by the subscription are reported to the global]
+    expected: FAIL
+
+  [Subscription reports errors that are pushed after subscriber is closed by completion]
+    expected: FAIL
+
+  [Errors thrown by initializer function after subscriber is closed by completion are reported]
+    expected: FAIL
+
+
+[observable-constructor.any.html]
+  [Observable constructor]
+    expected: FAIL
+
+  [Subscriber interface is not constructible]
+    expected: FAIL
+
+  [subscribe() can be called with no arguments]
+    expected: FAIL
+
+  [Observable constructor calls initializer on subscribe]
+    expected: FAIL
+
+  [Observable error path called synchronously]
+    expected: FAIL
+
+  [Observable should error if initializer throws]
+    expected: FAIL
+
+  [Subscription does not emit values after completion]
+    expected: FAIL
+
+  [Subscription does not emit values after error]
+    expected: FAIL
+
+  [Completing or nexting a subscriber after an error does nothing]
+    expected: FAIL
+
+  [Errors pushed to the subscriber that are not handled by the subscription are reported to the global]
+    expected: FAIL
+
+  [Errors thrown in the initializer that are not handled by the subscription are reported to the global]
+    expected: FAIL
+
+  [Subscription reports errors that are pushed after subscriber is closed by completion]
+    expected: FAIL
+
+  [Errors thrown by initializer function after subscriber is closed by completion are reported]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/dom/parts/basic-dom-part-declarative-brace-syntax-innerhtml.tentative.html.ini b/tests/wpt/meta-legacy-layout/dom/parts/basic-dom-part-declarative-brace-syntax-innerhtml.tentative.html.ini
new file mode 100644
index 00000000000..c68ae3e8990
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/dom/parts/basic-dom-part-declarative-brace-syntax-innerhtml.tentative.html.ini
@@ -0,0 +1,27 @@
+[basic-dom-part-declarative-brace-syntax-innerhtml.tentative.html]
+  [Declarative DOM Parts innerHTML <div><h1>content... (expect no parts)]
+    expected: FAIL
+
+  [Declarative DOM Parts innerHTML <div><h1 parseparts>content... (expect no parts)]
+    expected: FAIL
+
+  [Declarative DOM Parts innerHTML <div parseparts=""><h1>content... (expect no parts)]
+    expected: FAIL
+
+  [Declarative DOM Parts innerHTML <div parseparts=""><h1 parseparts>content... (expect no parts)]
+    expected: FAIL
+
+  [Declarative DOM Parts innerHTML <template><h1>content... (expect no parts)]
+    expected: FAIL
+
+  [Declarative DOM Parts innerHTML <template><h1 parseparts>content... (expect no parts)]
+    expected: FAIL
+
+  [Declarative DOM Parts innerHTML <template parseparts="" class="expect_success"><h1>content... (expect parts)]
+    expected: FAIL
+
+  [Declarative DOM Parts innerHTML <template parseparts="" class="expect_success"><h1 parseparts>content... (expect parts)]
+    expected: FAIL
+
+  [Basic NodePart parsing]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/fetch/metadata/generated/css-images.sub.tentative.html.ini b/tests/wpt/meta-legacy-layout/fetch/metadata/generated/css-images.sub.tentative.html.ini
index f9de5391ad6..f2d7867c9ff 100644
--- a/tests/wpt/meta-legacy-layout/fetch/metadata/generated/css-images.sub.tentative.html.ini
+++ b/tests/wpt/meta-legacy-layout/fetch/metadata/generated/css-images.sub.tentative.html.ini
@@ -146,3 +146,12 @@
 
   [list-style-image sec-fetch-site - HTTPS downgrade-upgrade]
     expected: FAIL
+
+  [border-image sec-fetch-mode - Not sent to non-trustworthy cross-site destination]
+    expected: FAIL
+
+  [background-image sec-fetch-site - HTTPS downgrade (header not sent)]
+    expected: TIMEOUT
+
+  [border-image sec-fetch-site - HTTPS downgrade (header not sent)]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/empty-iframe-load-event.html.ini b/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/empty-iframe-load-event.html.ini
new file mode 100644
index 00000000000..3e07e6b7d1f
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/empty-iframe-load-event.html.ini
@@ -0,0 +1,6 @@
+[empty-iframe-load-event.html]
+  [Check execution order from nested timeout]
+    expected: FAIL
+
+  [Check execution order on load handler]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/iframe-src-aboutblank-navigate-immediately.html.ini b/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/iframe-src-aboutblank-navigate-immediately.html.ini
index c5fc1407992..1bca09f21d6 100644
--- a/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/iframe-src-aboutblank-navigate-immediately.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/iframe-src-aboutblank-navigate-immediately.html.ini
@@ -1,5 +1,4 @@
 [iframe-src-aboutblank-navigate-immediately.html]
-  expected: TIMEOUT
   [Navigating to a different document with window.open]
     expected: FAIL
 
@@ -7,4 +6,4 @@
     expected: FAIL
 
   [Navigating to a different document with form submission]
-    expected: TIMEOUT
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/load-pageshow-events-iframe-contentWindow.html.ini b/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/load-pageshow-events-iframe-contentWindow.html.ini
index 149bcb4ff8c..51fd557bd7f 100644
--- a/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/load-pageshow-events-iframe-contentWindow.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/load-pageshow-events-iframe-contentWindow.html.ini
@@ -7,6 +7,3 @@
 
   [load & pageshow events do not fire on contentWindow of <iframe> element created with src='about:blank#foo']
     expected: FAIL
-
-  [load & pageshow events do not fire on contentWindow of <iframe> element created with src='about:blank']
-    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/load-pageshow-events-window-open.html.ini b/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/load-pageshow-events-window-open.html.ini
index 324db3d9b35..5aef7ce66ce 100644
--- a/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/load-pageshow-events-window-open.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/load-pageshow-events-window-open.html.ini
@@ -10,3 +10,6 @@
 
   [load event does not fire on window.open('about:blank?foo')]
     expected: FAIL
+
+  [load event does not fire on window.open('about:blank')]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/navigation-unload-same-origin.window.js.ini b/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/navigation-unload-same-origin.window.js.ini
similarity index 100%
rename from tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/navigation-unload-same-origin.window.js.ini
rename to tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/navigation-unload-same-origin.window.js.ini
diff --git a/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/replace-before-load/a-click.html.ini b/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/replace-before-load/a-click.html.ini
new file mode 100644
index 00000000000..60a4fa51f8a
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/replace-before-load/a-click.html.ini
@@ -0,0 +1,3 @@
+[a-click.html]
+  [aElement.click() before the load event must NOT replace]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/replace-before-load/form-submit-button-click.html.ini b/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/replace-before-load/form-submit-button-click.html.ini
index e84cccbbd1f..6c777ea167c 100644
--- a/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/replace-before-load/form-submit-button-click.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/replace-before-load/form-submit-button-click.html.ini
@@ -1,3 +1,4 @@
 [form-submit-button-click.html]
+  expected: TIMEOUT
   [Replace before load, triggered by submitButton.click()]
-    expected: FAIL
+    expected: TIMEOUT
diff --git a/tests/wpt/meta-legacy-layout/html/browsers/history/the-history-interface/traverse_the_history_write_onload_1.html.ini b/tests/wpt/meta-legacy-layout/html/browsers/history/the-history-interface/traverse_the_history_write_onload_1.html.ini
new file mode 100644
index 00000000000..02bd301a7ca
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/browsers/history/the-history-interface/traverse_the_history_write_onload_1.html.ini
@@ -0,0 +1,3 @@
+[traverse_the_history_write_onload_1.html]
+  [Traverse the history when a history entry is written in the load event]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/canvas/element/manual/drawing-text-to-the-canvas/canvas.2d.disconnected-font-size-math.html.ini b/tests/wpt/meta-legacy-layout/html/canvas/element/manual/drawing-text-to-the-canvas/canvas.2d.disconnected-font-size-math.html.ini
deleted file mode 100644
index addd810a23d..00000000000
--- a/tests/wpt/meta-legacy-layout/html/canvas/element/manual/drawing-text-to-the-canvas/canvas.2d.disconnected-font-size-math.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[canvas.2d.disconnected-font-size-math.html]
-  expected: CRASH
diff --git a/tests/wpt/meta-legacy-layout/html/canvas/element/manual/text/canvas.2d.disconnected.html.ini b/tests/wpt/meta-legacy-layout/html/canvas/element/manual/text/canvas.2d.disconnected.html.ini
index 17247137cb1..5cdcce07c65 100644
--- a/tests/wpt/meta-legacy-layout/html/canvas/element/manual/text/canvas.2d.disconnected.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/canvas/element/manual/text/canvas.2d.disconnected.html.ini
@@ -1,2 +1,2 @@
 [canvas.2d.disconnected.html]
-  expected: CRASH
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-01.html.ini b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-01.html.ini
new file mode 100644
index 00000000000..cc76a05c1d8
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-01.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-01.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-02.html.ini b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-02.html.ini
new file mode 100644
index 00000000000..d83ab8db3b9
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-02.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-02.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-03.html.ini b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-03.html.ini
new file mode 100644
index 00000000000..341d054ebbc
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-03.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-03.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-04.html.ini b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-04.html.ini
new file mode 100644
index 00000000000..d34ae8710b2
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-04.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-04.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-05.html.ini b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-05.html.ini
new file mode 100644
index 00000000000..c80d7307d57
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-05.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-05.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-06.html.ini b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-06.html.ini
new file mode 100644
index 00000000000..40d08e09e38
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-06.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-06.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-07.html.ini b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-07.html.ini
new file mode 100644
index 00000000000..8b118b20ad7
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-07.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-07.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-08.html.ini b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-08.html.ini
new file mode 100644
index 00000000000..927891eb7e0
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-08.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-08.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-09.html.ini b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-09.html.ini
new file mode 100644
index 00000000000..53ac23518f6
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-09.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-09.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-10.html.ini b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-10.html.ini
new file mode 100644
index 00000000000..9e6f6f536c0
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-10.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-10.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-11.html.ini b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-11.html.ini
new file mode 100644
index 00000000000..69ea943cfa8
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-11.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-11.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-12.html.ini b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-12.html.ini
new file mode 100644
index 00000000000..cb9af7df593
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-12.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-12.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-13.html.ini b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-13.html.ini
new file mode 100644
index 00000000000..43a10154051
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-13.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-13.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-14.html.ini b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-14.html.ini
new file mode 100644
index 00000000000..5b3c17a3035
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-14.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-14.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-15.html.ini b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-15.html.ini
new file mode 100644
index 00000000000..9b7646bf688
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-15.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-15.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-16.html.ini b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-16.html.ini
new file mode 100644
index 00000000000..57a8aa33c82
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-16.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-16.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-17.html.ini b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-17.html.ini
new file mode 100644
index 00000000000..8436d0266fe
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-17.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-17.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-18.html.ini b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-18.html.ini
new file mode 100644
index 00000000000..1a75c98888d
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-18.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-18.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-19.html.ini b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-19.html.ini
new file mode 100644
index 00000000000..882a73cedc1
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-19.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-19.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-20.html.ini b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-20.html.ini
new file mode 100644
index 00000000000..e2ac54e85b6
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-20.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-20.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-21.html.ini b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-21.html.ini
new file mode 100644
index 00000000000..1fe6eed4d86
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-21.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-21.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-22.html.ini b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-22.html.ini
new file mode 100644
index 00000000000..2bbb71f26cf
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-22.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-22.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-23.html.ini b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-23.html.ini
new file mode 100644
index 00000000000..340f5057d5c
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-23.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-23.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-24.html.ini b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-24.html.ini
new file mode 100644
index 00000000000..d4a3db2a878
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-24.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-24.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-25.html.ini b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-25.html.ini
new file mode 100644
index 00000000000..2ef28e7d55d
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-25.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-25.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-26.html.ini b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-26.html.ini
new file mode 100644
index 00000000000..eae14c85b6d
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-26.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-26.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-27.html.ini b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-27.html.ini
new file mode 100644
index 00000000000..49b7b6b841b
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-27.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-27.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-28.html.ini b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-28.html.ini
new file mode 100644
index 00000000000..c168cc1a8b6
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-28.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-28.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-29.html.ini b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-29.html.ini
new file mode 100644
index 00000000000..d03ea918944
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-29.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-29.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-30.html.ini b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-30.html.ini
new file mode 100644
index 00000000000..bbb82b3cd63
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-30.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-30.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-31.html.ini b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-31.html.ini
new file mode 100644
index 00000000000..052af599162
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-31.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-31.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-32.html.ini b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-32.html.ini
new file mode 100644
index 00000000000..d6240b000ed
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-32.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-32.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-33.html.ini b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-33.html.ini
new file mode 100644
index 00000000000..993ccadc8f3
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-33.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-33.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-34.html.ini b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-34.html.ini
new file mode 100644
index 00000000000..9a036bcae5c
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-34.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-34.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-35.html.ini b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-35.html.ini
new file mode 100644
index 00000000000..4b931e6b885
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-35.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-35.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-36.html.ini b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-36.html.ini
new file mode 100644
index 00000000000..5c6d67ba0d4
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-36.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-36.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-37.html.ini b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-37.html.ini
new file mode 100644
index 00000000000..fbada3e32c8
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-37.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-37.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-38.html.ini b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-38.html.ini
new file mode 100644
index 00000000000..09b03873496
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-38.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-38.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-39.html.ini b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-39.html.ini
new file mode 100644
index 00000000000..8d63022c0f9
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-39.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-39.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-40.html.ini b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-40.html.ini
new file mode 100644
index 00000000000..026d2a27546
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-40.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-40.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-41.html.ini b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-41.html.ini
new file mode 100644
index 00000000000..75cf38f059b
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-shadow-41.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-41.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/lang-attribute-shadow.window.js.ini b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/lang-attribute-shadow.window.js.ini
new file mode 100644
index 00000000000..ec7919c1c68
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/lang-attribute-shadow.window.js.ini
@@ -0,0 +1,18 @@
+[lang-attribute-shadow.window.html]
+  [lang only on slot]
+    expected: FAIL
+
+  [lang only on host]
+    expected: FAIL
+
+  [lang on host and slot]
+    expected: FAIL
+
+  [lang on host and slotted element]
+    expected: FAIL
+
+  [lang on host and slot and slotted element]
+    expected: FAIL
+
+  [lang on slot inherits from shadow host]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/infrastructure/urls/base-url/document-base-url-changes-about-srcdoc-2.https.html.ini b/tests/wpt/meta-legacy-layout/html/infrastructure/urls/base-url/document-base-url-changes-about-srcdoc-2.https.html.ini
deleted file mode 100644
index b21e45dd17f..00000000000
--- a/tests/wpt/meta-legacy-layout/html/infrastructure/urls/base-url/document-base-url-changes-about-srcdoc-2.https.html.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[document-base-url-changes-about-srcdoc-2.https.html]
-  [document-base-url-changes-about-srcdoc-2]
-    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/interaction/focus/the-autofocus-attribute/document-with-fragment-top.html.ini b/tests/wpt/meta-legacy-layout/html/interaction/focus/the-autofocus-attribute/document-with-fragment-top.html.ini
index ab1003579be..6f0fc648f04 100644
--- a/tests/wpt/meta-legacy-layout/html/interaction/focus/the-autofocus-attribute/document-with-fragment-top.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/interaction/focus/the-autofocus-attribute/document-with-fragment-top.html.ini
@@ -1,7 +1,6 @@
 [document-with-fragment-top.html]
-  expected: TIMEOUT
   [Autofocus elements in iframed documents with "top" fragments should work.]
     expected: FAIL
 
   [Autofocus elements in top-level browsing context's documents with "top" fragments should work.]
-    expected: TIMEOUT
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/interaction/focus/the-autofocus-attribute/supported-elements.html.ini b/tests/wpt/meta-legacy-layout/html/interaction/focus/the-autofocus-attribute/supported-elements.html.ini
index 8a926207630..d169bd2e9fa 100644
--- a/tests/wpt/meta-legacy-layout/html/interaction/focus/the-autofocus-attribute/supported-elements.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/interaction/focus/the-autofocus-attribute/supported-elements.html.ini
@@ -1,5 +1,4 @@
 [supported-elements.html]
-  expected: TIMEOUT
   [Contenteditable element should support autofocus]
     expected: FAIL
 
@@ -7,10 +6,10 @@
     expected: FAIL
 
   [Host element with delegatesFocus including no focusable descendants should be skipped]
-    expected: TIMEOUT
+    expected: FAIL
 
   [Area element should support autofocus]
-    expected: NOTRUN
+    expected: FAIL
 
   [Host element with delegatesFocus should support autofocus]
     expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/rendering/the-details-element/details-display-type-002.tentative.html.ini b/tests/wpt/meta-legacy-layout/html/rendering/the-details-element/details-display-type-002.tentative.html.ini
new file mode 100644
index 00000000000..4e5a3ff1e5b
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/rendering/the-details-element/details-display-type-002.tentative.html.ini
@@ -0,0 +1,2 @@
+[details-display-type-002.tentative.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/semantics/embedded-content/media-elements/loading-the-media-resource/resource-selection-source-media-env-change.html.ini b/tests/wpt/meta-legacy-layout/html/semantics/embedded-content/media-elements/loading-the-media-resource/resource-selection-source-media-env-change.html.ini
index a7b23688dad..516e1fa0442 100644
--- a/tests/wpt/meta-legacy-layout/html/semantics/embedded-content/media-elements/loading-the-media-resource/resource-selection-source-media-env-change.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/semantics/embedded-content/media-elements/loading-the-media-resource/resource-selection-source-media-env-change.html.ini
@@ -1,3 +1,4 @@
 [resource-selection-source-media-env-change.html]
+  expected: TIMEOUT
   [the <source> media attribute: no reaction to environment change]
-    expected: FAIL
+    expected: TIMEOUT
diff --git a/tests/wpt/meta-legacy-layout/html/semantics/embedded-content/the-img-element/image-compositing-change.html.ini b/tests/wpt/meta-legacy-layout/html/semantics/embedded-content/the-img-element/image-compositing-change.html.ini
deleted file mode 100644
index 30b696b181c..00000000000
--- a/tests/wpt/meta-legacy-layout/html/semantics/embedded-content/the-img-element/image-compositing-change.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[image-compositing-change.html]
-  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/semantics/forms/form-submission-0/multipart-formdata.window.js.ini b/tests/wpt/meta-legacy-layout/html/semantics/forms/form-submission-0/multipart-formdata.window.js.ini
index 52f30c9e707..ad86a0c8730 100644
--- a/tests/wpt/meta-legacy-layout/html/semantics/forms/form-submission-0/multipart-formdata.window.js.ini
+++ b/tests/wpt/meta-legacy-layout/html/semantics/forms/form-submission-0/multipart-formdata.window.js.ini
@@ -178,3 +178,9 @@
 
   [multipart/form-data: 0x00 in name (normal form)]
     expected: FAIL
+
+  [multipart/form-data: Basic test (formdata event)]
+    expected: FAIL
+
+  [multipart/form-data: non-ASCII in name and value (normal form)]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/semantics/forms/form-submission-0/reparent-form-during-planned-navigation-task.html.ini b/tests/wpt/meta-legacy-layout/html/semantics/forms/form-submission-0/reparent-form-during-planned-navigation-task.html.ini
new file mode 100644
index 00000000000..7682a4830bf
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/semantics/forms/form-submission-0/reparent-form-during-planned-navigation-task.html.ini
@@ -0,0 +1,4 @@
+[reparent-form-during-planned-navigation-task.html]
+  expected: TIMEOUT
+  [reparent-form-during-planned-navigation-task]
+    expected: TIMEOUT
diff --git a/tests/wpt/meta-legacy-layout/html/semantics/forms/form-submission-0/urlencoded2.window.js.ini b/tests/wpt/meta-legacy-layout/html/semantics/forms/form-submission-0/urlencoded2.window.js.ini
index 63ed783745e..091da3d48a6 100644
--- a/tests/wpt/meta-legacy-layout/html/semantics/forms/form-submission-0/urlencoded2.window.js.ini
+++ b/tests/wpt/meta-legacy-layout/html/semantics/forms/form-submission-0/urlencoded2.window.js.ini
@@ -143,9 +143,6 @@
   [application/x-www-form-urlencoded: character not in encoding in filename (normal form)]
     expected: FAIL
 
-  [application/x-www-form-urlencoded: 0x00 in name (formdata event)]
-    expected: FAIL
-
   [application/x-www-form-urlencoded: backslash in value (normal form)]
     expected: FAIL
 
@@ -167,9 +164,6 @@
   [application/x-www-form-urlencoded: double quote in value (normal form)]
     expected: FAIL
 
-  [application/x-www-form-urlencoded: Basic test (formdata event)]
-    expected: FAIL
-
   [application/x-www-form-urlencoded: lone surrogate in name and value (normal form)]
     expected: FAIL
 
@@ -178,3 +172,6 @@
 
   [application/x-www-form-urlencoded: non-ASCII in filename (formdata event)]
     expected: FAIL
+
+  [application/x-www-form-urlencoded: 0x00 in value (formdata event)]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/semantics/interactive-elements/the-details-element/name-attribute.tentative.html.ini b/tests/wpt/meta-legacy-layout/html/semantics/interactive-elements/the-details-element/name-attribute.html.ini
similarity index 91%
rename from tests/wpt/meta/html/semantics/interactive-elements/the-details-element/name-attribute.tentative.html.ini
rename to tests/wpt/meta-legacy-layout/html/semantics/interactive-elements/the-details-element/name-attribute.html.ini
index 2646908c361..d569dd37abc 100644
--- a/tests/wpt/meta/html/semantics/interactive-elements/the-details-element/name-attribute.tentative.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/semantics/interactive-elements/the-details-element/name-attribute.html.ini
@@ -1,4 +1,4 @@
-[name-attribute.tentative.html]
+[name-attribute.html]
   [basic handling of mutually exclusive details]
     expected: FAIL
 
@@ -8,7 +8,7 @@
   [mutually exclusive details across multiple names and multiple tree scopes]
     expected: FAIL
 
-  [mutation event and toggle event order matches tree order]
+  [mutation event and toggle event order]
     expected: FAIL
 
   [exclusivity enforcement with attachment scenario connected]
@@ -35,9 +35,6 @@
   [exclusivity enforcement with attachment scenario connected-in-template]
     expected: FAIL
 
-  [mutation event and toggle event order]
-    expected: FAIL
-
   [handling of name attribute changes]
     expected: FAIL
 
diff --git a/tests/wpt/meta-legacy-layout/html/semantics/interactive-elements/the-dialog-element/fixed-position-child-with-transformed-ancestor.html.ini b/tests/wpt/meta-legacy-layout/html/semantics/interactive-elements/the-dialog-element/fixed-position-child-with-transformed-ancestor.html.ini
deleted file mode 100644
index 267c09e0562..00000000000
--- a/tests/wpt/meta-legacy-layout/html/semantics/interactive-elements/the-dialog-element/fixed-position-child-with-transformed-ancestor.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[fixed-position-child-with-transformed-ancestor.html]
-  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/semantics/interactive-elements/the-dialog-element/fixed-position-child-with-transformed-ancestor.tentative.html.ini b/tests/wpt/meta-legacy-layout/html/semantics/interactive-elements/the-dialog-element/fixed-position-child-with-transformed-ancestor.tentative.html.ini
new file mode 100644
index 00000000000..5def8ec35f5
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/semantics/interactive-elements/the-dialog-element/fixed-position-child-with-transformed-ancestor.tentative.html.ini
@@ -0,0 +1,2 @@
+[fixed-position-child-with-transformed-ancestor.tentative.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/semantics/interactive-elements/the-dialog-element/fixed-position-child-with-will-change-ancestor.html.ini b/tests/wpt/meta-legacy-layout/html/semantics/interactive-elements/the-dialog-element/fixed-position-child-with-will-change-ancestor.html.ini
deleted file mode 100644
index 32f315368ab..00000000000
--- a/tests/wpt/meta-legacy-layout/html/semantics/interactive-elements/the-dialog-element/fixed-position-child-with-will-change-ancestor.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[fixed-position-child-with-will-change-ancestor.html]
-  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/semantics/interactive-elements/the-dialog-element/fixed-position-child-with-will-change-ancestor.tentative.html.ini b/tests/wpt/meta-legacy-layout/html/semantics/interactive-elements/the-dialog-element/fixed-position-child-with-will-change-ancestor.tentative.html.ini
new file mode 100644
index 00000000000..cddca13cbcc
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/semantics/interactive-elements/the-dialog-element/fixed-position-child-with-will-change-ancestor.tentative.html.ini
@@ -0,0 +1,2 @@
+[fixed-position-child-with-will-change-ancestor.tentative.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/semantics/interactive-elements/the-dialog-element/top-layer-stacking.html.ini b/tests/wpt/meta-legacy-layout/html/semantics/interactive-elements/the-dialog-element/top-layer-stacking.html.ini
deleted file mode 100644
index d85ee8e016a..00000000000
--- a/tests/wpt/meta-legacy-layout/html/semantics/interactive-elements/the-dialog-element/top-layer-stacking.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[top-layer-stacking.html]
-  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/semantics/interactive-elements/the-dialog-element/top-layer-stacking.tentative.html.ini b/tests/wpt/meta-legacy-layout/html/semantics/interactive-elements/the-dialog-element/top-layer-stacking.tentative.html.ini
new file mode 100644
index 00000000000..3f6ad25adbf
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/semantics/interactive-elements/the-dialog-element/top-layer-stacking.tentative.html.ini
@@ -0,0 +1,2 @@
+[top-layer-stacking.tentative.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/semantics/interfaces.html.ini b/tests/wpt/meta-legacy-layout/html/semantics/interfaces.html.ini
index f2d3fc77517..f4015594b6b 100644
--- a/tests/wpt/meta-legacy-layout/html/semantics/interfaces.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/semantics/interfaces.html.ini
@@ -110,3 +110,12 @@
 
   [Interfaces for SLOT: createElement]
     expected: FAIL
+
+  [Interfaces for permission: useNS]
+    expected: FAIL
+
+  [Interfaces for permission: useParser]
+    expected: FAIL
+
+  [Interfaces for PERMISSION: createElement]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/semantics/links/links-created-by-a-and-area-elements/htmlanchorelement_noopener.html.ini b/tests/wpt/meta-legacy-layout/html/semantics/links/links-created-by-a-and-area-elements/htmlanchorelement_noopener.html.ini
index cc18f512574..2d44172f4dc 100644
--- a/tests/wpt/meta-legacy-layout/html/semantics/links/links-created-by-a-and-area-elements/htmlanchorelement_noopener.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/semantics/links/links-created-by-a-and-area-elements/htmlanchorelement_noopener.html.ini
@@ -1,5 +1,6 @@
 [htmlanchorelement_noopener.html]
   type: testharness
+  expected: TIMEOUT
   [Check that targeting of rel=noopener with a given name ignores an existing window with that name]
     expected: NOTRUN
 
@@ -7,10 +8,10 @@
     expected: FAIL
 
   [Check that rel=noopener with target=_top does a normal load]
-    expected: FAIL
+    expected: NOTRUN
 
   [Check that rel=noopener with target=_parent does a normal load]
-    expected: FAIL
+    expected: NOTRUN
 
   [Check that rel=noopener with target=_self does a normal load]
-    expected: FAIL
+    expected: NOTRUN
diff --git a/tests/wpt/meta-legacy-layout/html/semantics/permission-element/no-end-tag-no-contents.html.ini b/tests/wpt/meta-legacy-layout/html/semantics/permission-element/no-end-tag-no-contents.html.ini
new file mode 100644
index 00000000000..9a7c183ef37
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/semantics/permission-element/no-end-tag-no-contents.html.ini
@@ -0,0 +1,3 @@
+[no-end-tag-no-contents.html]
+  [The permission element should have no end tag or contents]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/uievents/idlharness.window.js.ini b/tests/wpt/meta-legacy-layout/uievents/idlharness.window.js.ini
index 25d032b22eb..4995d1d82da 100644
--- a/tests/wpt/meta-legacy-layout/uievents/idlharness.window.js.ini
+++ b/tests/wpt/meta-legacy-layout/uievents/idlharness.window.js.ini
@@ -157,3 +157,21 @@
 
   [MutationEvent interface: operation initMutationEvent(DOMString, optional boolean, optional boolean, optional Node?, optional DOMString, optional DOMString, optional DOMString, optional unsigned short)]
     expected: FAIL
+
+  [MouseEvent interface: attribute layerX]
+    expected: FAIL
+
+  [MouseEvent interface: attribute layerY]
+    expected: FAIL
+
+  [MouseEvent interface: new MouseEvent("event") must inherit property "layerX" with the proper type]
+    expected: FAIL
+
+  [MouseEvent interface: new MouseEvent("event") must inherit property "layerY" with the proper type]
+    expected: FAIL
+
+  [MouseEvent interface: new WheelEvent("event") must inherit property "layerX" with the proper type]
+    expected: FAIL
+
+  [MouseEvent interface: new WheelEvent("event") must inherit property "layerY" with the proper type]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/webaudio/idlharness.https.window.js.ini b/tests/wpt/meta-legacy-layout/webaudio/idlharness.https.window.js.ini
index b5e9c75e20a..63969725792 100644
--- a/tests/wpt/meta-legacy-layout/webaudio/idlharness.https.window.js.ini
+++ b/tests/wpt/meta-legacy-layout/webaudio/idlharness.https.window.js.ini
@@ -1303,3 +1303,12 @@
 
   [AudioParamMap interface: maplike<DOMString, AudioParam>]
     expected: FAIL
+
+  [BaseAudioContext interface: attribute renderQuantumSize]
+    expected: FAIL
+
+  [BaseAudioContext interface: context must inherit property "renderQuantumSize" with the proper type]
+    expected: FAIL
+
+  [BaseAudioContext interface: new OfflineAudioContext(1, 1, sample_rate) must inherit property "renderQuantumSize" with the proper type]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/webaudio/the-audio-api/the-audiocontext-interface/audiocontext-not-fully-active.html.ini b/tests/wpt/meta-legacy-layout/webaudio/the-audio-api/the-audiocontext-interface/audiocontext-not-fully-active.html.ini
index eed03df37f3..b7537329068 100644
--- a/tests/wpt/meta-legacy-layout/webaudio/the-audio-api/the-audiocontext-interface/audiocontext-not-fully-active.html.ini
+++ b/tests/wpt/meta-legacy-layout/webaudio/the-audio-api/the-audiocontext-interface/audiocontext-not-fully-active.html.ini
@@ -1,4 +1,5 @@
 [audiocontext-not-fully-active.html]
+  expected: TIMEOUT
   [frame in navigated remote-site frame]
     expected: FAIL
 
diff --git a/tests/wpt/meta-legacy-layout/webaudio/the-audio-api/the-audioparam-interface/moderate-exponentialRamp.html.ini b/tests/wpt/meta-legacy-layout/webaudio/the-audio-api/the-audioparam-interface/moderate-exponentialRamp.html.ini
new file mode 100644
index 00000000000..4880a89bc1a
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/webaudio/the-audio-api/the-audioparam-interface/moderate-exponentialRamp.html.ini
@@ -0,0 +1,3 @@
+[moderate-exponentialRamp.html]
+  [Test exponentialRampToValueAtTime() with a moderate ratio of change]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/webgl/idlharness.any.js.ini b/tests/wpt/meta-legacy-layout/webgl/idlharness.any.js.ini
index 020e2f36dd9..b429262aa81 100644
--- a/tests/wpt/meta-legacy-layout/webgl/idlharness.any.js.ini
+++ b/tests/wpt/meta-legacy-layout/webgl/idlharness.any.js.ini
@@ -3896,6 +3896,9 @@
   [WebGL2RenderingContext interface: attribute unpackColorSpace]
     expected: FAIL
 
+  [WebGL2RenderingContext interface: operation getBufferSubData(GLenum, GLintptr, ArrayBufferView, optional unsigned long long, optional GLuint)]
+    expected: FAIL
+
 
 [idlharness.any.worker.html]
   [WebGL2RenderingContext interface: constant ONE_MINUS_SRC_COLOR on interface object]
@@ -10179,3 +10182,6 @@
 
   [WebGL2RenderingContext interface: attribute unpackColorSpace]
     expected: FAIL
+
+  [WebGL2RenderingContext interface: operation getBufferSubData(GLenum, GLintptr, ArrayBufferView, optional unsigned long long, optional GLuint)]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/webmessaging/with-ports/017.html.ini b/tests/wpt/meta-legacy-layout/webmessaging/with-ports/017.html.ini
deleted file mode 100644
index c7946fc91b4..00000000000
--- a/tests/wpt/meta-legacy-layout/webmessaging/with-ports/017.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[017.html]
-  expected: TIMEOUT
-  [origin of the script that invoked the method, about:blank]
-    expected: TIMEOUT
diff --git a/tests/wpt/meta-legacy-layout/workers/constructors/Worker/Worker-constructor.html.ini b/tests/wpt/meta-legacy-layout/workers/constructors/Worker/Worker-constructor.html.ini
new file mode 100644
index 00000000000..80f9a4f15b8
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/workers/constructors/Worker/Worker-constructor.html.ini
@@ -0,0 +1,2 @@
+[Worker-constructor.html]
+  expected: ERROR
diff --git a/tests/wpt/meta-legacy-layout/workers/shared-worker-partitioned-cookies.tentative.https.html.ini b/tests/wpt/meta-legacy-layout/workers/shared-worker-partitioned-cookies.tentative.https.html.ini
new file mode 100644
index 00000000000..0f221c965c3
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/workers/shared-worker-partitioned-cookies.tentative.https.html.ini
@@ -0,0 +1,3 @@
+[shared-worker-partitioned-cookies.tentative.https.html]
+  [SharedWorker: Partitioned Cookies]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/xhr/xhr-timeout-longtask.any.js.ini b/tests/wpt/meta-legacy-layout/xhr/xhr-timeout-longtask.any.js.ini
deleted file mode 100644
index 36b2068c5a6..00000000000
--- a/tests/wpt/meta-legacy-layout/xhr/xhr-timeout-longtask.any.js.ini
+++ /dev/null
@@ -1,6 +0,0 @@
-[xhr-timeout-longtask.any.worker.html]
-  [Long tasks should not trigger load timeout]
-    expected: FAIL
-
-
-[xhr-timeout-longtask.any.html]
diff --git a/tests/wpt/meta/MANIFEST.json b/tests/wpt/meta/MANIFEST.json
index b4f38f5d3d9..a61c4b4600f 100644
--- a/tests/wpt/meta/MANIFEST.json
+++ b/tests/wpt/meta/MANIFEST.json
@@ -1191,6 +1191,13 @@
        null,
        {}
       ]
+     ],
+     "tons-of-declarations-crash.html": [
+      "50a32c19389667a17768794415bbd89021fe1d88",
+      [
+       null,
+       {}
+      ]
      ]
     },
     "css-contain": {
@@ -5901,6 +5908,13 @@
          {}
         ]
        ],
+       "input-importNode-to-detached-document-crash.html": [
+        "5e0cff4fa309a4286f922082264e2ae82bc00321",
+        [
+         null,
+         {}
+        ]
+       ],
        "input-type-change-empty-crash.html": [
         "6e44250ccb79f3a2a06b6ef639914cad656a4bb6",
         [
@@ -30681,7 +30695,22 @@
        ],
        {}
       ]
-     ]
+     ],
+     "sticky": {
+      "position-sticky-offset-print.html": [
+       "3954bbcf4418b8af87dca12949efc7e6f59c963e",
+       [
+        null,
+        [
+         [
+          "/css/reference/ref-filled-green-100px-square.xht",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ]
+     }
     },
     "css-tables": {
      "tfoot-crash-print.html": [
@@ -130518,6 +130547,19 @@
      }
     },
     "css-anchor-position": {
+     "anchor-center-002.html": [
+      "b7f61003a67be5baf897fa5a9c7da982586820b1",
+      [
+       null,
+       [
+        [
+         "/css/css-anchor-position/anchor-center-002-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
      "anchor-default-001.html": [
       "8bb59851ee656715cb30d3a26690ee807b7fd7ca",
       [
@@ -137660,6 +137702,32 @@
        {}
       ]
      ],
+     "border-image-repeat-002.htm": [
+      "a0c081863d42cd4c0ea24996e23ace8537c7a133",
+      [
+       null,
+       [
+        [
+         "/css/css-backgrounds/reference/border-image-repeat-002-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "border-image-repeat-004.htm": [
+      "40194506940c38f2669ae1c5e8fd43b74b2313ce",
+      [
+       null,
+       [
+        [
+         "/css/css-backgrounds/reference/border-image-repeat-004-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
      "border-image-repeat-005.html": [
       "f5078fc322c936d65415a4bfec5d022357cb714c",
       [
@@ -138181,6 +138249,19 @@
        {}
       ]
      ],
+     "border-image-slice-004.htm": [
+      "1e5adb311f597fc4fa3c4413628b70ebd4c4103e",
+      [
+       null,
+       [
+        [
+         "/css/css-backgrounds/reference/border-image-slice-004-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
      "border-image-slice-005.htm": [
       "5d8bd7df1c3fe1b09a8a9387e355e2c7d111b805",
       [
@@ -153525,6 +153606,32 @@
        {}
       ]
      ],
+     "light-dark-currentcolor.html": [
+      "512a492b293d469b4c66052dd0b1d4ba9ca15b30",
+      [
+       null,
+       [
+        [
+         "/css/reference/ref-filled-green-100px-square-only.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "light-dark-inheritance.html": [
+      "1128b57319b0e9b8b4224b6c3005e18d349d8191",
+      [
+       null,
+       [
+        [
+         "/css/reference/ref-filled-green-100px-square-only.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
      "named-001.html": [
       "61a98dcb7bb02fab3db18ed337eee5ddb07724fc",
       [
@@ -180184,6 +180291,19 @@
       ]
      ],
      "order": {
+      "order-abs-children-painting-order-different-container.html": [
+       "202581dd1d1b668722182aa22744b092c064cb95",
+       [
+        null,
+        [
+         [
+          "/css/reference/ref-filled-green-100px-square-only.html",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
       "order-abs-children-painting-order.html": [
        "248f380e5aebb651069116cb32722389a511d962",
        [
@@ -183588,6 +183708,19 @@
        {}
       ]
      ],
+     "font-synthesis-08.html": [
+      "b3de1afcaee681b7e79969b325fc6bf98de4ec1c",
+      [
+       null,
+       [
+        [
+         "/css/css-fonts/font-synthesis-08-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
      "font-synthesis-position-001.html": [
       "1ed13f67c1950f3abf4b599c2b58ad1b0db3d169",
       [
@@ -192783,60 +192916,6 @@
          ]
         ]
        },
-       "align-tracks": {
-        "masonry-align-tracks-001.html": [
-         "4ff3e61087597bee960e30d245bf3aae255cec72",
-         [
-          null,
-          [
-           [
-            "/css/css-grid/masonry/tentative/align-tracks/masonry-align-tracks-001-ref.html",
-            "=="
-           ]
-          ],
-          {}
-         ]
-        ],
-        "masonry-align-tracks-multi-001.html": [
-         "0e20217da8063dc2e35fae3333b93988210e7eb1",
-         [
-          null,
-          [
-           [
-            "/css/css-grid/masonry/tentative/align-tracks/masonry-align-tracks-multi-001-ref.html",
-            "=="
-           ]
-          ],
-          {}
-         ]
-        ],
-        "masonry-align-tracks-stretch-001.html": [
-         "d2fede7a8edcd0ddec450baa2961d767ba89a81a",
-         [
-          null,
-          [
-           [
-            "/css/css-grid/masonry/tentative/align-tracks/masonry-align-tracks-stretch-001-ref.html",
-            "=="
-           ]
-          ],
-          {}
-         ]
-        ],
-        "masonry-align-tracks-stretch-002.html": [
-         "1631ac3c07d3f97c30ebcad6f16f9b3cd29cd4d4",
-         [
-          null,
-          [
-           [
-            "/css/css-grid/masonry/tentative/align-tracks/masonry-align-tracks-stretch-002-ref.html",
-            "=="
-           ]
-          ],
-          {}
-         ]
-        ]
-       },
        "baseline": {
         "masonry-grid-item-content-baseline-001.html": [
          "60d11653b3f231a07ad7aa493a0effeae7720671",
@@ -193293,60 +193372,6 @@
          ]
         ]
        },
-       "justify-tracks": {
-        "masonry-justify-tracks-001.html": [
-         "bfd3c1ca587bb0bdb534a281824f158dace0c04c",
-         [
-          null,
-          [
-           [
-            "/css/css-grid/masonry/tentative/justify-tracks/masonry-justify-tracks-001-ref.html",
-            "=="
-           ]
-          ],
-          {}
-         ]
-        ],
-        "masonry-justify-tracks-multi-001.html": [
-         "011c487cb721d6185d6a27debf9fec0953af5bfe",
-         [
-          null,
-          [
-           [
-            "/css/css-grid/masonry/tentative/justify-tracks/masonry-justify-tracks-multi-001-ref.html",
-            "=="
-           ]
-          ],
-          {}
-         ]
-        ],
-        "masonry-justify-tracks-stretch-001.html": [
-         "17cb321821830281a65b284af2de40ab3a6f53ef",
-         [
-          null,
-          [
-           [
-            "/css/css-grid/masonry/tentative/justify-tracks/masonry-justify-tracks-stretch-001-ref.html",
-            "=="
-           ]
-          ],
-          {}
-         ]
-        ],
-        "masonry-justify-tracks-stretch-002.html": [
-         "6b7746722dca430951c2f3be63e8d66308566b0c",
-         [
-          null,
-          [
-           [
-            "/css/css-grid/masonry/tentative/justify-tracks/masonry-justify-tracks-stretch-002-ref.html",
-            "=="
-           ]
-          ],
-          {}
-         ]
-        ]
-       },
        "masonry-columns-item-containing-block-is-grid-content-width.html": [
         "e48b650253974a22e2dbf68eee6505ca918ddde7",
         [
@@ -206909,6 +206934,19 @@
         {}
        ]
       ],
+      "clip-path-foreignobject-non-zero-xy.html": [
+       "a63f4c8aa294db0b3e1ed3a3434015d65ecf453f",
+       [
+        null,
+        [
+         [
+          "/css/css-masking/clip-path/reference/green-100x100.html",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
       "clip-path-geometryBox-2.html": [
        "d4c47349d2053c90ebb82998b10b16e916421dbb",
        [
@@ -207871,6 +207909,19 @@
         {}
        ]
       ],
+      "clip-path-shape-foreignobject-non-zero-xy.html": [
+       "4e221f36e4cb7bc698f1929dcc09096114ab2693",
+       [
+        null,
+        [
+         [
+          "/css/css-masking/clip-path/reference/green-100x100.html",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
       "clip-path-strokeBox-1a.html": [
        "487f5363b694304923538d0314d3c6d2a685da6b",
        [
@@ -299067,6 +299118,57 @@
         {}
        ]
       ],
+      "file-input-horizontal.optional.html": [
+       "b7bcb340e0ef1644e99bbe665d544cc51f446ce8",
+       [
+        null,
+        [
+         [
+          "/css/css-writing-modes/forms/file-input-vertical.optional.html",
+          "!="
+         ],
+         [
+          "/css/css-writing-modes/forms/file-input-vertical-rtl.optional.html",
+          "!="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "file-input-vertical-rtl.optional.html": [
+       "b58242555b31251ba174fd691240337fc927f19b",
+       [
+        null,
+        [
+         [
+          "/css/css-writing-modes/forms/file-input-horizontal.optional.html",
+          "!="
+         ],
+         [
+          "/css/css-writing-modes/forms/file-input-vertical.optional.html",
+          "!="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "file-input-vertical.optional.html": [
+       "c9b4272f84b2ed4b29a63516d156fb7c26f2b3fa",
+       [
+        null,
+        [
+         [
+          "/css/css-writing-modes/forms/file-input-vertical-rtl.optional.html",
+          "!="
+         ],
+         [
+          "/css/css-writing-modes/forms/file-input-horizontal.optional.html",
+          "!="
+         ]
+        ],
+        {}
+       ]
+      ],
       "meter-appearance-native-horizontal.optional.html": [
        "7b25e1a9000d6c611c62c770871b7e32e4f8c696",
        [
@@ -319920,6 +320022,539 @@
      },
      "elements": {
       "global-attributes": {
+       "dir-shadow-01.html": [
+        "2d6983cb14b3f3f2c4f4ddbb2dcb987ecbc99bcf",
+        [
+         null,
+         [
+          [
+           "/html/dom/elements/global-attributes/dir-shadow-01-ref.html",
+           "=="
+          ]
+         ],
+         {}
+        ]
+       ],
+       "dir-shadow-02.html": [
+        "0553ef9a333a03f211c3fd302011c0b1c17c52a4",
+        [
+         null,
+         [
+          [
+           "/html/dom/elements/global-attributes/dir-shadow-02-ref.html",
+           "=="
+          ]
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     ],
     "audio-encoder.https.any.js": [
-     "cd7739bcd26deb4fb8e5970d39180d68e3a331d3",
+     "51496551cf525b3208be63bb3dbce325a13882ed",
      [
       "webcodecs/audio-encoder.https.any.html",
       {
@@ -728221,7 +729147,7 @@
      ]
     ],
     "transfering.https.any.js": [
-     "b9487e589d833d8617eeae4d7f4cc513c30a9c69",
+     "b127670d7b4c6f78382f1b34a080ac9b7a119a6c",
      [
       "webcodecs/transfering.https.any.html",
       {
@@ -744509,6 +745435,147 @@
          {}
         ]
        ],
+       "close-connecting-async.any.js": [
+        "c7ace1fca2734085705e191cd2a5e089f2306664",
+        [
+         "websockets/interfaces/WebSocket/close/close-connecting-async.any.html",
+         {
+          "script_metadata": [
+           [
+            "script",
+            "../../../constants.sub.js"
+           ],
+           [
+            "variant",
+            ""
+           ],
+           [
+            "variant",
+            "?wpt_flags=h2"
+           ],
+           [
+            "variant",
+            "?wss"
+           ]
+          ]
+         }
+        ],
+        [
+         "websockets/interfaces/WebSocket/close/close-connecting-async.any.html?wpt_flags=h2",
+         {
+          "script_metadata": [
+           [
+            "script",
+            "../../../constants.sub.js"
+           ],
+           [
+            "variant",
+            ""
+           ],
+           [
+            "variant",
+            "?wpt_flags=h2"
+           ],
+           [
+            "variant",
+            "?wss"
+           ]
+          ]
+         }
+        ],
+        [
+         "websockets/interfaces/WebSocket/close/close-connecting-async.any.html?wss",
+         {
+          "script_metadata": [
+           [
+            "script",
+            "../../../constants.sub.js"
+           ],
+           [
+            "variant",
+            ""
+           ],
+           [
+            "variant",
+            "?wpt_flags=h2"
+           ],
+           [
+            "variant",
+            "?wss"
+           ]
+          ]
+         }
+        ],
+        [
+         "websockets/interfaces/WebSocket/close/close-connecting-async.any.worker.html",
+         {
+          "script_metadata": [
+           [
+            "script",
+            "../../../constants.sub.js"
+           ],
+           [
+            "variant",
+            ""
+           ],
+           [
+            "variant",
+            "?wpt_flags=h2"
+           ],
+           [
+            "variant",
+            "?wss"
+           ]
+          ]
+         }
+        ],
+        [
+         "websockets/interfaces/WebSocket/close/close-connecting-async.any.worker.html?wpt_flags=h2",
+         {
+          "script_metadata": [
+           [
+            "script",
+            "../../../constants.sub.js"
+           ],
+           [
+            "variant",
+            ""
+           ],
+           [
+            "variant",
+            "?wpt_flags=h2"
+           ],
+           [
+            "variant",
+            "?wss"
+           ]
+          ]
+         }
+        ],
+        [
+         "websockets/interfaces/WebSocket/close/close-connecting-async.any.worker.html?wss",
+         {
+          "script_metadata": [
+           [
+            "script",
+            "../../../constants.sub.js"
+           ],
+           [
+            "variant",
+            ""
+           ],
+           [
+            "variant",
+            "?wpt_flags=h2"
+           ],
+           [
+            "variant",
+            "?wss"
+           ]
+          ]
+         }
+        ]
+       ],
        "close-connecting.html": [
         "de038ca09f0ea6b24419e9ae3da1c621b6302f3c",
         [
@@ -753762,6 +754829,15 @@
       {}
      ]
     ],
+    "shared-worker-partitioned-cookies.tentative.https.html": [
+     "e5f79cd864965af352c5ebcc4491d1311b652ef0",
+     [
+      null,
+      {
+       "timeout": "long"
+      }
+     ]
+    ],
     "shared-worker-partitioned.tentative.html": [
      "0be8479fa9b0d6f8bca1109d3adc27ae76242cef",
      [
@@ -775666,41 +776742,6 @@
        {}
       ]
      ],
-     "border-image-repeat-001.htm": [
-      "e447421a89ff6a0036a209b1c2ecef93f256a6ae",
-      [
-       null,
-       {}
-      ]
-     ],
-     "border-image-repeat-002.htm": [
-      "f1fd6ffbc3bf56c18c6d10a7460dc5be3a073117",
-      [
-       null,
-       {}
-      ]
-     ],
-     "border-image-repeat-003.htm": [
-      "255fdfccb96fe5a27ceba17aa72728dd528f0edc",
-      [
-       null,
-       {}
-      ]
-     ],
-     "border-image-repeat-004.htm": [
-      "acf7cfa7b842b96c70a57dda047e834e8649f594",
-      [
-       null,
-       {}
-      ]
-     ],
-     "border-image-slice-004.htm": [
-      "86b3c1e6b1dd80770c3867b058e9a8920786db06",
-      [
-       null,
-       {}
-      ]
-     ],
      "border-images.html": [
       "930a1df3b7fda4098f36cc9691a544f46e2311d5",
       [
@@ -780166,10 +781207,12 @@
          ]
         ],
         "invalid.py": [
-         "cfe5711e63bed061462fb1cd5da75e023883b5fb",
+         "9de343955c8a260203f0a0beee962e0aa2ddaaf6",
          [
           null,
-          {}
+          {
+           "timeout": "long"
+          }
          ]
         ],
         "invalid_tentative.py": [
@@ -780248,6 +781291,13 @@
           null,
           {}
          ]
+        ],
+        "user_activation.py": [
+         "786fb43954f19d28e08b9b75b88b06d29dad89bc",
+         [
+          null,
+          {}
+         ]
         ]
        },
        "classic_interop": {
@@ -780326,7 +781376,7 @@
          ]
         ],
         "invalid.py": [
-         "666bf4d06e0ef128132ef659c8ce039e3821f6fc",
+         "f27720a204e5ae78e12fcfa6be883750b9767337",
          [
           null,
           {}
@@ -780380,6 +781430,13 @@
           null,
           {}
          ]
+        ],
+        "user_activation.py": [
+         "4ca558435d70e3890b0b8b8c7b7b3f4cd28db91e",
+         [
+          null,
+          {}
+         ]
         ]
        },
        "get_realms": {
diff --git a/tests/wpt/meta/WebCryptoAPI/import_export/okp_importKey.https.any.js.ini b/tests/wpt/meta/WebCryptoAPI/import_export/okp_importKey.https.any.js.ini
index 5c65209a084..381ee699ecc 100644
--- a/tests/wpt/meta/WebCryptoAPI/import_export/okp_importKey.https.any.js.ini
+++ b/tests/wpt/meta/WebCryptoAPI/import_export/okp_importKey.https.any.js.ini
@@ -287,6 +287,66 @@
   [Good parameters: X448 bits (jwk, object(crv, d, x, kty), {name: X448}, false, [deriveKey, deriveBits, deriveKey, deriveBits\])]
     expected: FAIL
 
+  [Good parameters with ignored JWK alg: Ed25519 (jwk, object(kty, crv, x), {name: Ed25519}, true, [verify\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: Ed25519 (jwk, object(kty, crv, x), {name: Ed25519}, true, [\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: Ed25519 (jwk, object(kty, crv, x), {name: Ed25519}, true, [verify, verify\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: Ed25519 (jwk, object(crv, d, x, kty), {name: Ed25519}, true, [sign\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: Ed25519 (jwk, object(crv, d, x, kty), {name: Ed25519}, true, [sign, sign\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: Ed448 (jwk, object(kty, crv, x), {name: Ed448}, true, [verify\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: Ed448 (jwk, object(kty, crv, x), {name: Ed448}, true, [\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: Ed448 (jwk, object(kty, crv, x), {name: Ed448}, true, [verify, verify\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: Ed448 (jwk, object(crv, d, x, kty), {name: Ed448}, true, [sign\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: Ed448 (jwk, object(crv, d, x, kty), {name: Ed448}, true, [sign, sign\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: X25519 (jwk, object(kty, crv, x), {name: X25519}, true, [\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: X25519 (jwk, object(crv, d, x, kty), {name: X25519}, true, [deriveKey\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: X25519 (jwk, object(crv, d, x, kty), {name: X25519}, true, [deriveBits, deriveKey\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: X25519 (jwk, object(crv, d, x, kty), {name: X25519}, true, [deriveBits\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: X25519 (jwk, object(crv, d, x, kty), {name: X25519}, true, [deriveKey, deriveBits, deriveKey, deriveBits\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: X448 (jwk, object(kty, crv, x), {name: X448}, true, [\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: X448 (jwk, object(crv, d, x, kty), {name: X448}, true, [deriveKey\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: X448 (jwk, object(crv, d, x, kty), {name: X448}, true, [deriveBits, deriveKey\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: X448 (jwk, object(crv, d, x, kty), {name: X448}, true, [deriveBits\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: X448 (jwk, object(crv, d, x, kty), {name: X448}, true, [deriveKey, deriveBits, deriveKey, deriveBits\])]
+    expected: FAIL
+
 
 [okp_importKey.https.any.html]
   [Good parameters: Ed25519 bits (spki, buffer(44), {name: Ed25519}, true, [\])]
@@ -576,3 +636,63 @@
 
   [Good parameters: X448 bits (jwk, object(crv, d, x, kty), {name: X448}, false, [deriveKey, deriveBits, deriveKey, deriveBits\])]
     expected: FAIL
+
+  [Good parameters with ignored JWK alg: Ed25519 (jwk, object(kty, crv, x), {name: Ed25519}, true, [verify\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: Ed25519 (jwk, object(kty, crv, x), {name: Ed25519}, true, [\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: Ed25519 (jwk, object(kty, crv, x), {name: Ed25519}, true, [verify, verify\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: Ed25519 (jwk, object(crv, d, x, kty), {name: Ed25519}, true, [sign\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: Ed25519 (jwk, object(crv, d, x, kty), {name: Ed25519}, true, [sign, sign\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: Ed448 (jwk, object(kty, crv, x), {name: Ed448}, true, [verify\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: Ed448 (jwk, object(kty, crv, x), {name: Ed448}, true, [\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: Ed448 (jwk, object(kty, crv, x), {name: Ed448}, true, [verify, verify\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: Ed448 (jwk, object(crv, d, x, kty), {name: Ed448}, true, [sign\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: Ed448 (jwk, object(crv, d, x, kty), {name: Ed448}, true, [sign, sign\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: X25519 (jwk, object(kty, crv, x), {name: X25519}, true, [\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: X25519 (jwk, object(crv, d, x, kty), {name: X25519}, true, [deriveKey\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: X25519 (jwk, object(crv, d, x, kty), {name: X25519}, true, [deriveBits, deriveKey\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: X25519 (jwk, object(crv, d, x, kty), {name: X25519}, true, [deriveBits\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: X25519 (jwk, object(crv, d, x, kty), {name: X25519}, true, [deriveKey, deriveBits, deriveKey, deriveBits\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: X448 (jwk, object(kty, crv, x), {name: X448}, true, [\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: X448 (jwk, object(crv, d, x, kty), {name: X448}, true, [deriveKey\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: X448 (jwk, object(crv, d, x, kty), {name: X448}, true, [deriveBits, deriveKey\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: X448 (jwk, object(crv, d, x, kty), {name: X448}, true, [deriveBits\])]
+    expected: FAIL
+
+  [Good parameters with ignored JWK alg: X448 (jwk, object(crv, d, x, kty), {name: X448}, true, [deriveKey, deriveBits, deriveKey, deriveBits\])]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-align/parsing/align-tracks-computed.html.ini b/tests/wpt/meta/css/css-align/parsing/align-tracks-computed.html.ini
deleted file mode 100644
index e63929a5b30..00000000000
--- a/tests/wpt/meta/css/css-align/parsing/align-tracks-computed.html.ini
+++ /dev/null
@@ -1,45 +0,0 @@
-[align-tracks-computed.html]
-  [Property align-tracks value 'normal']
-    expected: FAIL
-
-  [Property align-tracks value 'baseline']
-    expected: FAIL
-
-  [Property align-tracks value 'last baseline']
-    expected: FAIL
-
-  [Property align-tracks value 'space-between']
-    expected: FAIL
-
-  [Property align-tracks value 'space-around']
-    expected: FAIL
-
-  [Property align-tracks value 'space-evenly']
-    expected: FAIL
-
-  [Property align-tracks value 'stretch']
-    expected: FAIL
-
-  [Property align-tracks value 'center']
-    expected: FAIL
-
-  [Property align-tracks value 'start']
-    expected: FAIL
-
-  [Property align-tracks value 'end']
-    expected: FAIL
-
-  [Property align-tracks value 'flex-start']
-    expected: FAIL
-
-  [Property align-tracks value 'flex-end']
-    expected: FAIL
-
-  [Property align-tracks value 'unsafe end']
-    expected: FAIL
-
-  [Property align-tracks value 'safe flex-start']
-    expected: FAIL
-
-  [Property align-tracks value 'normal, normal']
-    expected: FAIL
diff --git a/tests/wpt/meta/css/css-align/parsing/align-tracks-valid.html.ini b/tests/wpt/meta/css/css-align/parsing/align-tracks-valid.html.ini
deleted file mode 100644
index cbe763cc151..00000000000
--- a/tests/wpt/meta/css/css-align/parsing/align-tracks-valid.html.ini
+++ /dev/null
@@ -1,54 +0,0 @@
-[align-tracks-valid.html]
-  [e.style['align-tracks'\] = "normal" should set the property value]
-    expected: FAIL
-
-  [e.style['align-tracks'\] = "baseline" should set the property value]
-    expected: FAIL
-
-  [e.style['align-tracks'\] = "first baseline" should set the property value]
-    expected: FAIL
-
-  [e.style['align-tracks'\] = "last baseline" should set the property value]
-    expected: FAIL
-
-  [e.style['align-tracks'\] = "space-between" should set the property value]
-    expected: FAIL
-
-  [e.style['align-tracks'\] = "space-around" should set the property value]
-    expected: FAIL
-
-  [e.style['align-tracks'\] = "space-evenly" should set the property value]
-    expected: FAIL
-
-  [e.style['align-tracks'\] = "stretch" should set the property value]
-    expected: FAIL
-
-  [e.style['align-tracks'\] = "center" should set the property value]
-    expected: FAIL
-
-  [e.style['align-tracks'\] = "start" should set the property value]
-    expected: FAIL
-
-  [e.style['align-tracks'\] = "end" should set the property value]
-    expected: FAIL
-
-  [e.style['align-tracks'\] = "flex-start" should set the property value]
-    expected: FAIL
-
-  [e.style['align-tracks'\] = "flex-end" should set the property value]
-    expected: FAIL
-
-  [e.style['align-tracks'\] = "unsafe end" should set the property value]
-    expected: FAIL
-
-  [e.style['align-tracks'\] = "safe flex-start" should set the property value]
-    expected: FAIL
-
-  [e.style['align-tracks'\] = "flex-start, last baseline" should set the property value]
-    expected: FAIL
-
-  [e.style['align-tracks'\] = "normal, normal" should set the property value]
-    expected: FAIL
-
-  [e.style['align-tracks'\] = "start, flex-end, flex-end, flex-end, flex-end" should set the property value]
-    expected: FAIL
diff --git a/tests/wpt/meta/css/css-align/parsing/justify-tracks-computed.html.ini b/tests/wpt/meta/css/css-align/parsing/justify-tracks-computed.html.ini
deleted file mode 100644
index c5b835863d7..00000000000
--- a/tests/wpt/meta/css/css-align/parsing/justify-tracks-computed.html.ini
+++ /dev/null
@@ -1,45 +0,0 @@
-[justify-tracks-computed.html]
-  [Property justify-tracks value 'normal']
-    expected: FAIL
-
-  [Property justify-tracks value 'space-between']
-    expected: FAIL
-
-  [Property justify-tracks value 'space-around']
-    expected: FAIL
-
-  [Property justify-tracks value 'space-evenly']
-    expected: FAIL
-
-  [Property justify-tracks value 'stretch']
-    expected: FAIL
-
-  [Property justify-tracks value 'center']
-    expected: FAIL
-
-  [Property justify-tracks value 'start']
-    expected: FAIL
-
-  [Property justify-tracks value 'end']
-    expected: FAIL
-
-  [Property justify-tracks value 'flex-start']
-    expected: FAIL
-
-  [Property justify-tracks value 'flex-end']
-    expected: FAIL
-
-  [Property justify-tracks value 'unsafe end']
-    expected: FAIL
-
-  [Property justify-tracks value 'safe flex-start']
-    expected: FAIL
-
-  [Property justify-tracks value 'left']
-    expected: FAIL
-
-  [Property justify-tracks value 'unsafe right']
-    expected: FAIL
-
-  [Property justify-tracks value 'normal, normal']
-    expected: FAIL
diff --git a/tests/wpt/meta/css/css-align/parsing/justify-tracks-valid.html.ini b/tests/wpt/meta/css/css-align/parsing/justify-tracks-valid.html.ini
deleted file mode 100644
index 641b10fa7bd..00000000000
--- a/tests/wpt/meta/css/css-align/parsing/justify-tracks-valid.html.ini
+++ /dev/null
@@ -1,51 +0,0 @@
-[justify-tracks-valid.html]
-  [e.style['justify-tracks'\] = "normal" should set the property value]
-    expected: FAIL
-
-  [e.style['justify-tracks'\] = "space-between" should set the property value]
-    expected: FAIL
-
-  [e.style['justify-tracks'\] = "space-around" should set the property value]
-    expected: FAIL
-
-  [e.style['justify-tracks'\] = "space-evenly" should set the property value]
-    expected: FAIL
-
-  [e.style['justify-tracks'\] = "stretch" should set the property value]
-    expected: FAIL
-
-  [e.style['justify-tracks'\] = "center" should set the property value]
-    expected: FAIL
-
-  [e.style['justify-tracks'\] = "start" should set the property value]
-    expected: FAIL
-
-  [e.style['justify-tracks'\] = "end" should set the property value]
-    expected: FAIL
-
-  [e.style['justify-tracks'\] = "flex-start" should set the property value]
-    expected: FAIL
-
-  [e.style['justify-tracks'\] = "flex-end" should set the property value]
-    expected: FAIL
-
-  [e.style['justify-tracks'\] = "unsafe end" should set the property value]
-    expected: FAIL
-
-  [e.style['justify-tracks'\] = "safe flex-start" should set the property value]
-    expected: FAIL
-
-  [e.style['justify-tracks'\] = "left" should set the property value]
-    expected: FAIL
-
-  [e.style['justify-tracks'\] = "unsafe right" should set the property value]
-    expected: FAIL
-
-  [e.style['justify-tracks'\] = "flex-start, last baseline" should set the property value]
-    expected: FAIL
-
-  [e.style['justify-tracks'\] = "normal, normal" should set the property value]
-    expected: FAIL
-
-  [e.style['justify-tracks'\] = "start, flex-end, flex-end, flex-end, flex-end" should set the property value]
-    expected: FAIL
diff --git a/tests/wpt/meta/css/css-backgrounds/border-image-repeat-002.htm.ini b/tests/wpt/meta/css/css-backgrounds/border-image-repeat-002.htm.ini
new file mode 100644
index 00000000000..fb4031b3d52
--- /dev/null
+++ b/tests/wpt/meta/css/css-backgrounds/border-image-repeat-002.htm.ini
@@ -0,0 +1,2 @@
+[border-image-repeat-002.htm]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-backgrounds/border-image-repeat-004.htm.ini b/tests/wpt/meta/css/css-backgrounds/border-image-repeat-004.htm.ini
new file mode 100644
index 00000000000..7ae2c899b70
--- /dev/null
+++ b/tests/wpt/meta/css/css-backgrounds/border-image-repeat-004.htm.ini
@@ -0,0 +1,2 @@
+[border-image-repeat-004.htm]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-backgrounds/border-image-slice-004.htm.ini b/tests/wpt/meta/css/css-backgrounds/border-image-slice-004.htm.ini
new file mode 100644
index 00000000000..33ecfc8ebc7
--- /dev/null
+++ b/tests/wpt/meta/css/css-backgrounds/border-image-slice-004.htm.ini
@@ -0,0 +1,2 @@
+[border-image-slice-004.htm]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-color/light-dark-basic.html.ini b/tests/wpt/meta/css/css-color/light-dark-basic.html.ini
new file mode 100644
index 00000000000..e04d692f0eb
--- /dev/null
+++ b/tests/wpt/meta/css/css-color/light-dark-basic.html.ini
@@ -0,0 +1,6 @@
+[light-dark-basic.html]
+  [light-dark(white, black)]
+    expected: FAIL
+
+  [light-dark(light-dark(white, red), red)]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-color/light-dark-currentcolor.html.ini b/tests/wpt/meta/css/css-color/light-dark-currentcolor.html.ini
new file mode 100644
index 00000000000..669af6d8ea5
--- /dev/null
+++ b/tests/wpt/meta/css/css-color/light-dark-currentcolor.html.ini
@@ -0,0 +1,2 @@
+[light-dark-currentcolor.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-color/light-dark-inheritance.html.ini b/tests/wpt/meta/css/css-color/light-dark-inheritance.html.ini
new file mode 100644
index 00000000000..bf8493daf3a
--- /dev/null
+++ b/tests/wpt/meta/css/css-color/light-dark-inheritance.html.ini
@@ -0,0 +1,2 @@
+[light-dark-inheritance.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-fonts/variations/at-font-face-font-matching.html.ini b/tests/wpt/meta/css/css-fonts/variations/at-font-face-font-matching.html.ini
index d12a4482f02..ca491f611bd 100644
--- a/tests/wpt/meta/css/css-fonts/variations/at-font-face-font-matching.html.ini
+++ b/tests/wpt/meta/css/css-fonts/variations/at-font-face-font-matching.html.ini
@@ -50,9 +50,6 @@
   [Matching font-stretch: '110%' should prefer '115% 116%' over '105%']
     expected: FAIL
 
-  [Matching font-stretch: '90%' should prefer '90% 100%' over '50% 80%']
-    expected: FAIL
-
   [Matching font-style: 'normal' should prefer 'oblique 0deg' over 'oblique 10deg 40deg']
     expected: FAIL
 
@@ -71,9 +68,6 @@
   [Matching font-style: 'oblique 10deg' should prefer 'oblique -50deg -20deg' over 'oblique -40deg -30deg']
     expected: FAIL
 
-  [Matching font-style: 'oblique 0deg' should prefer 'oblique 5deg' over 'oblique 15deg 20deg']
-    expected: FAIL
-
   [Matching font-style: 'oblique 0deg' should prefer 'oblique 15deg 20deg' over 'oblique 30deg 60deg']
     expected: FAIL
 
@@ -107,9 +101,6 @@
   [Matching font-weight: '430' should prefer '340 398' over '501 550']
     expected: FAIL
 
-  [Matching font-style: 'oblique 10deg' should prefer 'oblique 30deg 60deg' over 'oblique 40deg 50deg']
-    expected: FAIL
-
   [Matching font-style: 'oblique -20deg' should prefer 'oblique -10deg' over 'italic']
     expected: FAIL
 
@@ -146,9 +137,6 @@
   [Matching font-weight: '400' should prefer '400' over '450 460']
     expected: FAIL
 
-  [Matching font-style: 'italic' should prefer 'normal' over 'oblique 0deg']
-    expected: FAIL
-
   [Matching font-style: 'oblique 20deg' should prefer 'oblique 40deg 50deg' over 'oblique 10deg']
     expected: FAIL
 
@@ -164,12 +152,6 @@
   [Matching font-style: 'oblique 20deg' should prefer 'oblique 20deg' over 'oblique 30deg 60deg']
     expected: FAIL
 
-  [Matching font-style: 'oblique 21deg' should prefer 'oblique 10deg' over 'italic']
-    expected: FAIL
-
-  [Matching font-style: 'oblique 10deg' should prefer 'oblique 5deg' over 'oblique 15deg 20deg']
-    expected: FAIL
-
   [Matching font-weight: '399' should prefer '400' over '450 460']
     expected: FAIL
 
@@ -191,9 +173,6 @@
   [Matching font-style: 'oblique 10deg' should prefer 'oblique 10deg' over 'oblique 5deg']
     expected: FAIL
 
-  [Matching font-style: 'oblique 10deg' should prefer 'oblique 40deg 50deg' over 'italic']
-    expected: FAIL
-
   [Matching font-style: 'oblique -20deg' should prefer 'italic' over 'oblique 0deg']
     expected: FAIL
 
@@ -206,9 +185,6 @@
   [Matching font-weight: '430' should prefer '500' over '400 425']
     expected: FAIL
 
-  [Matching font-weight: '500' should prefer '350 399' over '351 398']
-    expected: FAIL
-
   [Matching font-weight: '501' should prefer '500' over '450 460']
     expected: FAIL
 
@@ -224,9 +200,6 @@
   [Matching font-style: 'oblique -10deg' should prefer 'oblique -50deg -40deg' over 'italic']
     expected: FAIL
 
-  [Matching font-style: 'normal' should prefer 'normal' over 'oblique 0deg']
-    expected: FAIL
-
   [Matching font-style: 'normal' should prefer 'oblique 10deg 40deg' over 'oblique 20deg 30deg']
     expected: FAIL
 
@@ -248,9 +221,6 @@
   [Matching font-style: 'italic' should prefer 'oblique 0deg' over 'oblique -60deg -30deg']
     expected: FAIL
 
-  [Matching font-style: 'oblique -10deg' should prefer 'italic' over 'oblique 0deg 10deg']
-    expected: FAIL
-
   [Matching font-style: 'oblique 20deg' should prefer 'oblique 0deg' over 'oblique -50deg -20deg']
     expected: FAIL
 
@@ -260,9 +230,6 @@
   [Matching font-weight: '500' should prefer '500' over '450 460']
     expected: FAIL
 
-  [Matching font-weight: '501' should prefer '501' over '502 510']
-    expected: FAIL
-
   [Matching font-style: 'normal' should prefer 'oblique -50deg -20deg' over 'oblique -40deg -30deg']
     expected: FAIL
 
@@ -277,3 +244,45 @@
 
   [Matching font-style: 'oblique -21deg' should prefer 'italic' over 'oblique 0deg']
     expected: FAIL
+
+  [Matching font-weight: '500' should prefer '450 460' over '400']
+    expected: FAIL
+
+  [Matching font-weight: '399' should prefer '350 399' over '340 360']
+    expected: FAIL
+
+  [Matching font-stretch: '110%' should prefer '100%' over '50% 80%']
+    expected: FAIL
+
+  [Matching font-stretch: '90%' should prefer '50% 80%' over '60% 70%']
+    expected: FAIL
+
+  [Matching font-stretch: '90%' should prefer '110% 140%' over '120% 130%']
+    expected: FAIL
+
+  [Matching font-style: 'italic' should prefer 'oblique 20deg' over 'oblique 30deg 60deg']
+    expected: FAIL
+
+  [Matching font-style: 'italic' should prefer 'oblique 30deg 60deg' over 'oblique 40deg 50deg']
+    expected: FAIL
+
+  [Matching font-style: 'italic' should prefer 'oblique 5deg' over 'normal']
+    expected: FAIL
+
+  [Matching font-style: 'oblique 20deg' should prefer 'oblique 10deg' over 'italic']
+    expected: FAIL
+
+  [Matching font-style: 'oblique 10deg' should prefer 'oblique 0deg' over 'oblique -50deg -20deg']
+    expected: FAIL
+
+  [Matching font-style: 'oblique 0deg' should prefer 'italic' over 'oblique -50deg -20deg']
+    expected: FAIL
+
+  [Matching font-style: 'oblique -20deg' should prefer 'oblique -60deg -40deg' over 'oblique -10deg']
+    expected: FAIL
+
+  [Matching font-style: 'oblique -21deg' should prefer 'oblique -21deg' over 'oblique -60deg -40deg']
+    expected: FAIL
+
+  [Matching font-style: 'oblique -21deg' should prefer 'oblique 0deg' over 'oblique 30deg 60deg']
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-text/text-spacing-trim/text-spacing-trim-combinations-001.html.ini b/tests/wpt/meta/css/css-text/text-spacing-trim/text-spacing-trim-combinations-001.html.ini
deleted file mode 100644
index 52b0d0166bc..00000000000
--- a/tests/wpt/meta/css/css-text/text-spacing-trim/text-spacing-trim-combinations-001.html.ini
+++ /dev/null
@@ -1,27 +0,0 @@
-[text-spacing-trim-combinations-001.html]
-  ["国（（国"]
-    expected: FAIL
-
-  ["国・（国"]
-    expected: FAIL
-
-  ["国）（国"]
-    expected: FAIL
-
-  ["国　（国"]
-    expected: FAIL
-
-  ["国））国"]
-    expected: FAIL
-
-  ["国）・国"]
-    expected: FAIL
-
-  ["国）　国"]
-    expected: FAIL
-
-  ["国（（（国"]
-    expected: FAIL
-
-  ["国）））国"]
-    expected: FAIL
diff --git a/tests/wpt/meta/css/css-ui/parsing/form-sizing-computed.html.ini b/tests/wpt/meta/css/css-ui/parsing/form-sizing-computed.html.ini
index 39141cebc56..25c7ccdbe18 100644
--- a/tests/wpt/meta/css/css-ui/parsing/form-sizing-computed.html.ini
+++ b/tests/wpt/meta/css/css-ui/parsing/form-sizing-computed.html.ini
@@ -4,3 +4,9 @@
 
   [Property form-sizing value 'normal']
     expected: FAIL
+
+  [Property form-sizing value 'fixed']
+    expected: FAIL
+
+  [Property form-sizing value 'content']
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-ui/parsing/form-sizing-valid.html.ini b/tests/wpt/meta/css/css-ui/parsing/form-sizing-valid.html.ini
index cda7dbed687..a31eb2c5cb0 100644
--- a/tests/wpt/meta/css/css-ui/parsing/form-sizing-valid.html.ini
+++ b/tests/wpt/meta/css/css-ui/parsing/form-sizing-valid.html.ini
@@ -4,3 +4,9 @@
 
   [e.style['form-sizing'\] = "normal" should set the property value]
     expected: FAIL
+
+  [e.style['form-sizing'\] = "fixed" should set the property value]
+    expected: FAIL
+
+  [e.style['form-sizing'\] = "content" should set the property value]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/selectors/is-where-parsing.html.ini b/tests/wpt/meta/css/selectors/is-where-parsing.html.ini
index dae62bf6253..83f85b33d30 100644
--- a/tests/wpt/meta/css/selectors/is-where-parsing.html.ini
+++ b/tests/wpt/meta/css/selectors/is-where-parsing.html.ini
@@ -40,3 +40,99 @@
 
   [Pseudo-elements inside]
     expected: FAIL
+
+  [":is(div )" should be a valid selector]
+    expected: FAIL
+
+  [":where(div )" should be a valid selector]
+    expected: FAIL
+
+  [":is(div + bar, div ~ .baz)" should be a valid selector]
+    expected: FAIL
+
+  [":where(div + bar, div ~ .baz)" should be a valid selector]
+    expected: FAIL
+
+  [":is(:is(div))" should be a valid selector]
+    expected: FAIL
+
+  [":where(:is(div))" should be a valid selector]
+    expected: FAIL
+
+  [":is(:where(div))" should be a valid selector]
+    expected: FAIL
+
+  [":where(:where(div))" should be a valid selector]
+    expected: FAIL
+
+  [":host(:is(div))" should be a valid selector]
+    expected: FAIL
+
+  [":host(:where(div))" should be a valid selector]
+    expected: FAIL
+
+  [":host(:is(div ))" should be a valid selector]
+    expected: FAIL
+
+  [":host(:where(div ))" should be a valid selector]
+    expected: FAIL
+
+  [":host(:is(div .foo))" should be a valid selector]
+    expected: FAIL
+
+  [":host(:where(div .foo))" should be a valid selector]
+    expected: FAIL
+
+  [":is(:hover, :active)" should be a valid selector]
+    expected: FAIL
+
+  [":where(:hover, :active)" should be a valid selector]
+    expected: FAIL
+
+  [":is(div):hover" should be a valid selector]
+    expected: FAIL
+
+  [":where(div):hover" should be a valid selector]
+    expected: FAIL
+
+  [":is(div)::before" should be a valid selector]
+    expected: FAIL
+
+  [":where(div)::before" should be a valid selector]
+    expected: FAIL
+
+  [":is(::before)" should be a valid selector]
+    expected: FAIL
+
+  [":where(::before)" should be a valid selector]
+    expected: FAIL
+
+  [":is(div) + bar" should be a valid selector]
+    expected: FAIL
+
+  [":where(div) + bar" should be a valid selector]
+    expected: FAIL
+
+  ["::part(foo):is(:hover)" should be a valid selector]
+    expected: FAIL
+
+  ["::part(foo):where(:hover)" should be a valid selector]
+    expected: FAIL
+
+  ["::part(foo):is([attr='value'\])" should be a valid selector]
+    expected: FAIL
+
+  ["::part(foo):where([attr='value'\])" should be a valid selector]
+    expected: FAIL
+
+  [":not(:is(div))" should be a valid selector]
+    expected: FAIL
+
+  [":not(:where(div))" should be a valid selector]
+    expected: FAIL
+
+  [":not(:is(div .foo))" should be a valid selector]
+    expected: FAIL
+
+  [":not(:where(div .foo))" should be a valid selector]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/selectors/parsing/parse-has-disallow-nesting-has-inside-has.html.ini b/tests/wpt/meta/css/selectors/parsing/parse-has-disallow-nesting-has-inside-has.html.ini
index 7b4af3d0cd3..6d4e77b234b 100644
--- a/tests/wpt/meta/css/selectors/parsing/parse-has-disallow-nesting-has-inside-has.html.ini
+++ b/tests/wpt/meta/css/selectors/parsing/parse-has-disallow-nesting-has-inside-has.html.ini
@@ -16,3 +16,9 @@
 
   [CSS Selectors: The relational pseudo-class (disallow nesting :has() inside :has())]
     expected: FAIL
+
+  [":has(:is(:has(*)))" should be a valid selector]
+    expected: FAIL
+
+  [":has(:where(:has(*)))" should be a valid selector]
+    expected: FAIL
diff --git a/tests/wpt/meta/dom/observable/tentative/observable-constructor.any.js.ini b/tests/wpt/meta/dom/observable/tentative/observable-constructor.any.js.ini
new file mode 100644
index 00000000000..5eb54f20977
--- /dev/null
+++ b/tests/wpt/meta/dom/observable/tentative/observable-constructor.any.js.ini
@@ -0,0 +1,80 @@
+[observable-constructor.any.worker.html]
+  [Observable constructor]
+    expected: FAIL
+
+  [Subscriber interface is not constructible]
+    expected: FAIL
+
+  [subscribe() can be called with no arguments]
+    expected: FAIL
+
+  [Observable constructor calls initializer on subscribe]
+    expected: FAIL
+
+  [Observable error path called synchronously]
+    expected: FAIL
+
+  [Observable should error if initializer throws]
+    expected: FAIL
+
+  [Subscription does not emit values after completion]
+    expected: FAIL
+
+  [Subscription does not emit values after error]
+    expected: FAIL
+
+  [Completing or nexting a subscriber after an error does nothing]
+    expected: FAIL
+
+  [Errors pushed to the subscriber that are not handled by the subscription are reported to the global]
+    expected: FAIL
+
+  [Errors thrown in the initializer that are not handled by the subscription are reported to the global]
+    expected: FAIL
+
+  [Subscription reports errors that are pushed after subscriber is closed by completion]
+    expected: FAIL
+
+  [Errors thrown by initializer function after subscriber is closed by completion are reported]
+    expected: FAIL
+
+
+[observable-constructor.any.html]
+  [Observable constructor]
+    expected: FAIL
+
+  [Subscriber interface is not constructible]
+    expected: FAIL
+
+  [subscribe() can be called with no arguments]
+    expected: FAIL
+
+  [Observable constructor calls initializer on subscribe]
+    expected: FAIL
+
+  [Observable error path called synchronously]
+    expected: FAIL
+
+  [Observable should error if initializer throws]
+    expected: FAIL
+
+  [Subscription does not emit values after completion]
+    expected: FAIL
+
+  [Subscription does not emit values after error]
+    expected: FAIL
+
+  [Completing or nexting a subscriber after an error does nothing]
+    expected: FAIL
+
+  [Errors pushed to the subscriber that are not handled by the subscription are reported to the global]
+    expected: FAIL
+
+  [Errors thrown in the initializer that are not handled by the subscription are reported to the global]
+    expected: FAIL
+
+  [Subscription reports errors that are pushed after subscriber is closed by completion]
+    expected: FAIL
+
+  [Errors thrown by initializer function after subscriber is closed by completion are reported]
+    expected: FAIL
diff --git a/tests/wpt/meta/dom/parts/basic-dom-part-declarative-brace-syntax-innerhtml.tentative.html.ini b/tests/wpt/meta/dom/parts/basic-dom-part-declarative-brace-syntax-innerhtml.tentative.html.ini
new file mode 100644
index 00000000000..c68ae3e8990
--- /dev/null
+++ b/tests/wpt/meta/dom/parts/basic-dom-part-declarative-brace-syntax-innerhtml.tentative.html.ini
@@ -0,0 +1,27 @@
+[basic-dom-part-declarative-brace-syntax-innerhtml.tentative.html]
+  [Declarative DOM Parts innerHTML <div><h1>content... (expect no parts)]
+    expected: FAIL
+
+  [Declarative DOM Parts innerHTML <div><h1 parseparts>content... (expect no parts)]
+    expected: FAIL
+
+  [Declarative DOM Parts innerHTML <div parseparts=""><h1>content... (expect no parts)]
+    expected: FAIL
+
+  [Declarative DOM Parts innerHTML <div parseparts=""><h1 parseparts>content... (expect no parts)]
+    expected: FAIL
+
+  [Declarative DOM Parts innerHTML <template><h1>content... (expect no parts)]
+    expected: FAIL
+
+  [Declarative DOM Parts innerHTML <template><h1 parseparts>content... (expect no parts)]
+    expected: FAIL
+
+  [Declarative DOM Parts innerHTML <template parseparts="" class="expect_success"><h1>content... (expect parts)]
+    expected: FAIL
+
+  [Declarative DOM Parts innerHTML <template parseparts="" class="expect_success"><h1 parseparts>content... (expect parts)]
+    expected: FAIL
+
+  [Basic NodePart parsing]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/iframe-src-aboutblank-navigate-immediately.html.ini b/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/iframe-src-aboutblank-navigate-immediately.html.ini
index 530635e744f..1bca09f21d6 100644
--- a/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/iframe-src-aboutblank-navigate-immediately.html.ini
+++ b/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/iframe-src-aboutblank-navigate-immediately.html.ini
@@ -4,3 +4,6 @@
 
   [Navigating to a different document with link click]
     expected: FAIL
+
+  [Navigating to a different document with form submission]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/load-pageshow-events-iframe-contentWindow.html.ini b/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/load-pageshow-events-iframe-contentWindow.html.ini
index 51fd557bd7f..574b2fd8927 100644
--- a/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/load-pageshow-events-iframe-contentWindow.html.ini
+++ b/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/load-pageshow-events-iframe-contentWindow.html.ini
@@ -5,5 +5,5 @@
   [load & pageshow events do not fire on contentWindow of <iframe> element created with src='about:blank?foo']
     expected: FAIL
 
-  [load & pageshow events do not fire on contentWindow of <iframe> element created with src='about:blank#foo']
+  [load & pageshow events do not fire on contentWindow of <iframe> element created with src='about:blank']
     expected: FAIL
diff --git a/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/javascript-url-return-value-handling-dynamic.html.ini b/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/javascript-url-return-value-handling-dynamic.html.ini
index f27acdd3b9d..78240a2f463 100644
--- a/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/javascript-url-return-value-handling-dynamic.html.ini
+++ b/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/javascript-url-return-value-handling-dynamic.html.ini
@@ -4,3 +4,15 @@
 
   [Test javascript URL string return values in direct and indirect (target) frame contexts. 9]
     expected: FAIL
+
+  [0041 set in href="" targeting a frame and clicked]
+    expected: FAIL
+
+  [0080 00FF set in href="" targeting a frame and clicked]
+    expected: FAIL
+
+  [0080 00FF 0100 set in href="" targeting a frame and clicked]
+    expected: FAIL
+
+  [D83D DE0D set in href="" targeting a frame and clicked]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/navigate-to-unparseable-url.html.ini b/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/navigate-to-unparseable-url.html.ini
index 27889a98fb5..24d2f8ac554 100644
--- a/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/navigate-to-unparseable-url.html.ini
+++ b/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/navigate-to-unparseable-url.html.ini
@@ -1,6 +1,3 @@
 [navigate-to-unparseable-url.html]
   [location.href setter throws a SyntaxError DOMException for unparseable URLs]
     expected: FAIL
-
-  [<a> tag navigate fails for unparseable URLs]
-    expected: FAIL
diff --git a/tests/wpt/meta/html/browsers/browsing-the-web/overlapping-navigations-and-traversals/nav-cancelation-2.sub.html.ini b/tests/wpt/meta/html/browsers/browsing-the-web/overlapping-navigations-and-traversals/nav-cancelation-2.sub.html.ini
index 0e40ffc0656..9f7f24f662e 100644
--- a/tests/wpt/meta/html/browsers/browsing-the-web/overlapping-navigations-and-traversals/nav-cancelation-2.sub.html.ini
+++ b/tests/wpt/meta/html/browsers/browsing-the-web/overlapping-navigations-and-traversals/nav-cancelation-2.sub.html.ini
@@ -1,4 +1,3 @@
 [nav-cancelation-2.sub.html]
-  expected: TIMEOUT
   [grandparent cancels a pending navigation in a cross-origin grandchild]
-    expected: TIMEOUT
+    expected: FAIL
diff --git a/tests/wpt/meta/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini b/tests/wpt/meta/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini
deleted file mode 100644
index 7a5fcb79165..00000000000
--- a/tests/wpt/meta/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[traverse_the_history_5.html]
-  [Multiple history traversals, last would be aborted]
-    expected: FAIL
diff --git a/tests/wpt/meta/html/browsers/the-window-object/open-close/creating_browsing_context_test_01.html.ini b/tests/wpt/meta/html/browsers/the-window-object/open-close/creating_browsing_context_test_01.html.ini
deleted file mode 100644
index 4b4820d1729..00000000000
--- a/tests/wpt/meta/html/browsers/the-window-object/open-close/creating_browsing_context_test_01.html.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[creating_browsing_context_test_01.html]
-  [first argument: absolute url]
-    expected: FAIL
diff --git a/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-01.html.ini b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-01.html.ini
new file mode 100644
index 00000000000..cc76a05c1d8
--- /dev/null
+++ b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-01.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-01.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-02.html.ini b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-02.html.ini
new file mode 100644
index 00000000000..d83ab8db3b9
--- /dev/null
+++ b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-02.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-02.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-03.html.ini b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-03.html.ini
new file mode 100644
index 00000000000..341d054ebbc
--- /dev/null
+++ b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-03.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-03.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-04.html.ini b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-04.html.ini
new file mode 100644
index 00000000000..d34ae8710b2
--- /dev/null
+++ b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-04.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-04.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-05.html.ini b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-05.html.ini
new file mode 100644
index 00000000000..c80d7307d57
--- /dev/null
+++ b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-05.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-05.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-06.html.ini b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-06.html.ini
new file mode 100644
index 00000000000..40d08e09e38
--- /dev/null
+++ b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-06.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-06.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-07.html.ini b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-07.html.ini
new file mode 100644
index 00000000000..8b118b20ad7
--- /dev/null
+++ b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-07.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-07.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-08.html.ini b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-08.html.ini
new file mode 100644
index 00000000000..927891eb7e0
--- /dev/null
+++ b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-08.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-08.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-09.html.ini b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-09.html.ini
new file mode 100644
index 00000000000..53ac23518f6
--- /dev/null
+++ b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-09.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-09.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-10.html.ini b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-10.html.ini
new file mode 100644
index 00000000000..9e6f6f536c0
--- /dev/null
+++ b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-10.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-10.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-11.html.ini b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-11.html.ini
new file mode 100644
index 00000000000..69ea943cfa8
--- /dev/null
+++ b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-11.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-11.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-12.html.ini b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-12.html.ini
new file mode 100644
index 00000000000..cb9af7df593
--- /dev/null
+++ b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-12.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-12.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-13.html.ini b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-13.html.ini
new file mode 100644
index 00000000000..43a10154051
--- /dev/null
+++ b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-13.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-13.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-14.html.ini b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-14.html.ini
new file mode 100644
index 00000000000..5b3c17a3035
--- /dev/null
+++ b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-14.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-14.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-15.html.ini b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-15.html.ini
new file mode 100644
index 00000000000..9b7646bf688
--- /dev/null
+++ b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-15.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-15.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-16.html.ini b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-16.html.ini
new file mode 100644
index 00000000000..57a8aa33c82
--- /dev/null
+++ b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-16.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-16.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-17.html.ini b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-17.html.ini
new file mode 100644
index 00000000000..8436d0266fe
--- /dev/null
+++ b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-17.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-17.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-18.html.ini b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-18.html.ini
new file mode 100644
index 00000000000..1a75c98888d
--- /dev/null
+++ b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-18.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-18.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-19.html.ini b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-19.html.ini
new file mode 100644
index 00000000000..882a73cedc1
--- /dev/null
+++ b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-19.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-19.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-20.html.ini b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-20.html.ini
new file mode 100644
index 00000000000..e2ac54e85b6
--- /dev/null
+++ b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-20.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-20.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-21.html.ini b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-21.html.ini
new file mode 100644
index 00000000000..1fe6eed4d86
--- /dev/null
+++ b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-21.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-21.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-22.html.ini b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-22.html.ini
new file mode 100644
index 00000000000..2bbb71f26cf
--- /dev/null
+++ b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-22.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-22.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-23.html.ini b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-23.html.ini
new file mode 100644
index 00000000000..340f5057d5c
--- /dev/null
+++ b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-23.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-23.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-24.html.ini b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-24.html.ini
new file mode 100644
index 00000000000..d4a3db2a878
--- /dev/null
+++ b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-24.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-24.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-25.html.ini b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-25.html.ini
new file mode 100644
index 00000000000..2ef28e7d55d
--- /dev/null
+++ b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-25.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-25.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-26.html.ini b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-26.html.ini
new file mode 100644
index 00000000000..eae14c85b6d
--- /dev/null
+++ b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-26.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-26.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-27.html.ini b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-27.html.ini
new file mode 100644
index 00000000000..49b7b6b841b
--- /dev/null
+++ b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-27.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-27.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-28.html.ini b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-28.html.ini
new file mode 100644
index 00000000000..c168cc1a8b6
--- /dev/null
+++ b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-28.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-28.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-29.html.ini b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-29.html.ini
new file mode 100644
index 00000000000..d03ea918944
--- /dev/null
+++ b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-29.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-29.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-30.html.ini b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-30.html.ini
new file mode 100644
index 00000000000..bbb82b3cd63
--- /dev/null
+++ b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-30.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-30.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-31.html.ini b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-31.html.ini
new file mode 100644
index 00000000000..052af599162
--- /dev/null
+++ b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-31.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-31.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-32.html.ini b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-32.html.ini
new file mode 100644
index 00000000000..d6240b000ed
--- /dev/null
+++ b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-32.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-32.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-33.html.ini b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-33.html.ini
new file mode 100644
index 00000000000..993ccadc8f3
--- /dev/null
+++ b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-33.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-33.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-34.html.ini b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-34.html.ini
new file mode 100644
index 00000000000..9a036bcae5c
--- /dev/null
+++ b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-34.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-34.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-35.html.ini b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-35.html.ini
new file mode 100644
index 00000000000..4b931e6b885
--- /dev/null
+++ b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-35.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-35.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-36.html.ini b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-36.html.ini
new file mode 100644
index 00000000000..5c6d67ba0d4
--- /dev/null
+++ b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-36.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-36.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-37.html.ini b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-37.html.ini
new file mode 100644
index 00000000000..fbada3e32c8
--- /dev/null
+++ b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-37.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-37.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-38.html.ini b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-38.html.ini
new file mode 100644
index 00000000000..09b03873496
--- /dev/null
+++ b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-38.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-38.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-39.html.ini b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-39.html.ini
new file mode 100644
index 00000000000..8d63022c0f9
--- /dev/null
+++ b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-39.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-39.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-40.html.ini b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-40.html.ini
new file mode 100644
index 00000000000..026d2a27546
--- /dev/null
+++ b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-40.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-40.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-41.html.ini b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-41.html.ini
new file mode 100644
index 00000000000..75cf38f059b
--- /dev/null
+++ b/tests/wpt/meta/html/dom/elements/global-attributes/dir-shadow-41.html.ini
@@ -0,0 +1,2 @@
+[dir-shadow-41.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/html/dom/elements/global-attributes/lang-attribute-shadow.window.js.ini b/tests/wpt/meta/html/dom/elements/global-attributes/lang-attribute-shadow.window.js.ini
new file mode 100644
index 00000000000..ec7919c1c68
--- /dev/null
+++ b/tests/wpt/meta/html/dom/elements/global-attributes/lang-attribute-shadow.window.js.ini
@@ -0,0 +1,18 @@
+[lang-attribute-shadow.window.html]
+  [lang only on slot]
+    expected: FAIL
+
+  [lang only on host]
+    expected: FAIL
+
+  [lang on host and slot]
+    expected: FAIL
+
+  [lang on host and slotted element]
+    expected: FAIL
+
+  [lang on host and slot and slotted element]
+    expected: FAIL
+
+  [lang on slot inherits from shadow host]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/editing/dnd/the-draggable-attribute/draggable_attribute.html.ini b/tests/wpt/meta/html/editing/dnd/the-draggable-attribute/draggable_attribute.html.ini
index 3aefca6fde9..91cac15f60d 100644
--- a/tests/wpt/meta/html/editing/dnd/the-draggable-attribute/draggable_attribute.html.ini
+++ b/tests/wpt/meta/html/editing/dnd/the-draggable-attribute/draggable_attribute.html.ini
@@ -880,3 +880,9 @@
 
   [Element å-bar draggable attribute test]
     expected: FAIL
+
+  [Element permission should have draggable property]
+    expected: FAIL
+
+  [Element permission draggable attribute test]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/infrastructure/urls/base-url/document-base-url-changes-about-srcdoc-2.https.html.ini b/tests/wpt/meta/html/infrastructure/urls/base-url/document-base-url-changes-about-srcdoc-2.https.html.ini
deleted file mode 100644
index b21e45dd17f..00000000000
--- a/tests/wpt/meta/html/infrastructure/urls/base-url/document-base-url-changes-about-srcdoc-2.https.html.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[document-base-url-changes-about-srcdoc-2.https.html]
-  [document-base-url-changes-about-srcdoc-2]
-    expected: FAIL
diff --git a/tests/wpt/meta/html/interaction/focus/the-autofocus-attribute/document-with-fragment-nonexistent.html.ini b/tests/wpt/meta/html/interaction/focus/the-autofocus-attribute/document-with-fragment-nonexistent.html.ini
index 114d6424efc..a10be12e8cc 100644
--- a/tests/wpt/meta/html/interaction/focus/the-autofocus-attribute/document-with-fragment-nonexistent.html.ini
+++ b/tests/wpt/meta/html/interaction/focus/the-autofocus-attribute/document-with-fragment-nonexistent.html.ini
@@ -1,6 +1,7 @@
 [document-with-fragment-nonexistent.html]
+  expected: TIMEOUT
   [Autofocus elements in iframed documents with non-existent fragments should work.]
     expected: FAIL
 
   [Autofocus elements in top-level browsing context's documents with non-existent fragments should work.]
-    expected: FAIL
+    expected: TIMEOUT
diff --git a/tests/wpt/meta/html/interaction/focus/the-autofocus-attribute/supported-elements.html.ini b/tests/wpt/meta/html/interaction/focus/the-autofocus-attribute/supported-elements.html.ini
index ddd65fdcec8..16db1ea9c58 100644
--- a/tests/wpt/meta/html/interaction/focus/the-autofocus-attribute/supported-elements.html.ini
+++ b/tests/wpt/meta/html/interaction/focus/the-autofocus-attribute/supported-elements.html.ini
@@ -1,15 +1,16 @@
 [supported-elements.html]
+  expected: TIMEOUT
   [Contenteditable element should support autofocus]
     expected: FAIL
 
   [Host element with delegatesFocus including no focusable descendants should be skipped]
-    expected: FAIL
+    expected: TIMEOUT
 
   [Element with tabindex should support autofocus]
     expected: FAIL
 
   [Area element should support autofocus]
-    expected: FAIL
+    expected: NOTRUN
 
   [Host element with delegatesFocus should support autofocus]
     expected: FAIL
diff --git a/tests/wpt/meta/html/rendering/the-details-element/details-display-type-002.tentative.html.ini b/tests/wpt/meta/html/rendering/the-details-element/details-display-type-002.tentative.html.ini
new file mode 100644
index 00000000000..4e5a3ff1e5b
--- /dev/null
+++ b/tests/wpt/meta/html/rendering/the-details-element/details-display-type-002.tentative.html.ini
@@ -0,0 +1,2 @@
+[details-display-type-002.tentative.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/html/semantics/embedded-content/media-elements/loading-the-media-resource/resource-selection-source-media-env-change.html.ini b/tests/wpt/meta/html/semantics/embedded-content/media-elements/loading-the-media-resource/resource-selection-source-media-env-change.html.ini
index a7b23688dad..516e1fa0442 100644
--- a/tests/wpt/meta/html/semantics/embedded-content/media-elements/loading-the-media-resource/resource-selection-source-media-env-change.html.ini
+++ b/tests/wpt/meta/html/semantics/embedded-content/media-elements/loading-the-media-resource/resource-selection-source-media-env-change.html.ini
@@ -1,3 +1,4 @@
 [resource-selection-source-media-env-change.html]
+  expected: TIMEOUT
   [the <source> media attribute: no reaction to environment change]
-    expected: FAIL
+    expected: TIMEOUT
diff --git a/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-2.html.ini b/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-2.html.ini
index 841bafc6eca..26704422bbe 100644
--- a/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-2.html.ini
+++ b/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-2.html.ini
@@ -1,3 +1,4 @@
 [iframe_sandbox_popups_escaping-2.html]
+  expected: TIMEOUT
   [Check that popups from a sandboxed iframe escape the sandbox if\n       allow-popups-to-escape-sandbox is used]
-    expected: FAIL
+    expected: TIMEOUT
diff --git a/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini b/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini
index 4034793cc72..c6f1e5d7d84 100644
--- a/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini
+++ b/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini
@@ -1,3 +1,4 @@
 [iframe_sandbox_popups_nonescaping-2.html]
+  expected: TIMEOUT
   [Check that popups from a sandboxed iframe do not escape the sandbox]
-    expected: FAIL
+    expected: NOTRUN
diff --git a/tests/wpt/meta/html/semantics/embedded-content/the-img-element/image-compositing-change.html.ini b/tests/wpt/meta/html/semantics/embedded-content/the-img-element/image-compositing-change.html.ini
deleted file mode 100644
index 30b696b181c..00000000000
--- a/tests/wpt/meta/html/semantics/embedded-content/the-img-element/image-compositing-change.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[image-compositing-change.html]
-  expected: FAIL
diff --git a/tests/wpt/meta/html/semantics/forms/historical.html.ini b/tests/wpt/meta/html/semantics/forms/historical.html.ini
deleted file mode 100644
index 5d8289307cc..00000000000
--- a/tests/wpt/meta/html/semantics/forms/historical.html.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[historical.html]
-  [<input name=isindex> should not be supported]
-    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/semantics/interactive-elements/the-details-element/name-attribute.tentative.html.ini b/tests/wpt/meta/html/semantics/interactive-elements/the-details-element/name-attribute.html.ini
similarity index 84%
rename from tests/wpt/meta-legacy-layout/html/semantics/interactive-elements/the-details-element/name-attribute.tentative.html.ini
rename to tests/wpt/meta/html/semantics/interactive-elements/the-details-element/name-attribute.html.ini
index 1b9c7154376..d569dd37abc 100644
--- a/tests/wpt/meta-legacy-layout/html/semantics/interactive-elements/the-details-element/name-attribute.tentative.html.ini
+++ b/tests/wpt/meta/html/semantics/interactive-elements/the-details-element/name-attribute.html.ini
@@ -1,4 +1,4 @@
-[name-attribute.tentative.html]
+[name-attribute.html]
   [basic handling of mutually exclusive details]
     expected: FAIL
 
@@ -8,10 +8,7 @@
   [mutually exclusive details across multiple names and multiple tree scopes]
     expected: FAIL
 
-  [mutation event and toggle event order matches order of insertion in set of named elements]
-    expected: FAIL
-
-  [mutation event and toggle event order matches tree order]
+  [mutation event and toggle event order]
     expected: FAIL
 
   [exclusivity enforcement with attachment scenario connected]
@@ -38,9 +35,6 @@
   [exclusivity enforcement with attachment scenario connected-in-template]
     expected: FAIL
 
-  [mutation event and toggle event order]
-    expected: FAIL
-
   [handling of name attribute changes]
     expected: FAIL
 
diff --git a/tests/wpt/meta/html/semantics/interactive-elements/the-dialog-element/fixed-position-child-with-transformed-ancestor.html.ini b/tests/wpt/meta/html/semantics/interactive-elements/the-dialog-element/fixed-position-child-with-transformed-ancestor.html.ini
deleted file mode 100644
index 267c09e0562..00000000000
--- a/tests/wpt/meta/html/semantics/interactive-elements/the-dialog-element/fixed-position-child-with-transformed-ancestor.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[fixed-position-child-with-transformed-ancestor.html]
-  expected: FAIL
diff --git a/tests/wpt/meta/html/semantics/interactive-elements/the-dialog-element/fixed-position-child-with-transformed-ancestor.tentative.html.ini b/tests/wpt/meta/html/semantics/interactive-elements/the-dialog-element/fixed-position-child-with-transformed-ancestor.tentative.html.ini
new file mode 100644
index 00000000000..5def8ec35f5
--- /dev/null
+++ b/tests/wpt/meta/html/semantics/interactive-elements/the-dialog-element/fixed-position-child-with-transformed-ancestor.tentative.html.ini
@@ -0,0 +1,2 @@
+[fixed-position-child-with-transformed-ancestor.tentative.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/html/semantics/interactive-elements/the-dialog-element/fixed-position-child-with-will-change-ancestor.html.ini b/tests/wpt/meta/html/semantics/interactive-elements/the-dialog-element/fixed-position-child-with-will-change-ancestor.html.ini
deleted file mode 100644
index 32f315368ab..00000000000
--- a/tests/wpt/meta/html/semantics/interactive-elements/the-dialog-element/fixed-position-child-with-will-change-ancestor.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[fixed-position-child-with-will-change-ancestor.html]
-  expected: FAIL
diff --git a/tests/wpt/meta/html/semantics/interactive-elements/the-dialog-element/fixed-position-child-with-will-change-ancestor.tentative.html.ini b/tests/wpt/meta/html/semantics/interactive-elements/the-dialog-element/fixed-position-child-with-will-change-ancestor.tentative.html.ini
new file mode 100644
index 00000000000..cddca13cbcc
--- /dev/null
+++ b/tests/wpt/meta/html/semantics/interactive-elements/the-dialog-element/fixed-position-child-with-will-change-ancestor.tentative.html.ini
@@ -0,0 +1,2 @@
+[fixed-position-child-with-will-change-ancestor.tentative.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/html/semantics/interactive-elements/the-dialog-element/top-layer-stacking.html.ini b/tests/wpt/meta/html/semantics/interactive-elements/the-dialog-element/top-layer-stacking.html.ini
deleted file mode 100644
index d85ee8e016a..00000000000
--- a/tests/wpt/meta/html/semantics/interactive-elements/the-dialog-element/top-layer-stacking.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[top-layer-stacking.html]
-  expected: FAIL
diff --git a/tests/wpt/meta/html/semantics/interactive-elements/the-dialog-element/top-layer-stacking.tentative.html.ini b/tests/wpt/meta/html/semantics/interactive-elements/the-dialog-element/top-layer-stacking.tentative.html.ini
new file mode 100644
index 00000000000..3f6ad25adbf
--- /dev/null
+++ b/tests/wpt/meta/html/semantics/interactive-elements/the-dialog-element/top-layer-stacking.tentative.html.ini
@@ -0,0 +1,2 @@
+[top-layer-stacking.tentative.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/html/semantics/interfaces.html.ini b/tests/wpt/meta/html/semantics/interfaces.html.ini
index 1eb16ea6005..bc426a7a6f2 100644
--- a/tests/wpt/meta/html/semantics/interfaces.html.ini
+++ b/tests/wpt/meta/html/semantics/interfaces.html.ini
@@ -61,3 +61,12 @@
 
   [Interfaces for SLOT: createElement]
     expected: FAIL
+
+  [Interfaces for permission: useNS]
+    expected: FAIL
+
+  [Interfaces for permission: useParser]
+    expected: FAIL
+
+  [Interfaces for PERMISSION: createElement]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/semantics/links/links-created-by-a-and-area-elements/htmlanchorelement_noopener.html.ini b/tests/wpt/meta/html/semantics/links/links-created-by-a-and-area-elements/htmlanchorelement_noopener.html.ini
index dcd52d2fee8..e0d30013daf 100644
--- a/tests/wpt/meta/html/semantics/links/links-created-by-a-and-area-elements/htmlanchorelement_noopener.html.ini
+++ b/tests/wpt/meta/html/semantics/links/links-created-by-a-and-area-elements/htmlanchorelement_noopener.html.ini
@@ -1,4 +1,5 @@
 [htmlanchorelement_noopener.html]
+  expected: TIMEOUT
   [Check that targeting of rel=noopener with a given name reuses an existing window with that name]
     expected: FAIL
 
@@ -9,4 +10,4 @@
     expected: FAIL
 
   [Check that rel=noopener with target=_self does a normal load]
-    expected: FAIL
+    expected: NOTRUN
diff --git a/tests/wpt/meta/html/semantics/permission-element/no-end-tag-no-contents.html.ini b/tests/wpt/meta/html/semantics/permission-element/no-end-tag-no-contents.html.ini
new file mode 100644
index 00000000000..9a7c183ef37
--- /dev/null
+++ b/tests/wpt/meta/html/semantics/permission-element/no-end-tag-no-contents.html.ini
@@ -0,0 +1,3 @@
+[no-end-tag-no-contents.html]
+  [The permission element should have no end tag or contents]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/webappapis/dynamic-markup-insertion/document-write/module-delayed.html.ini b/tests/wpt/meta/html/webappapis/dynamic-markup-insertion/document-write/module-delayed.html.ini
deleted file mode 100644
index fc0233f5241..00000000000
--- a/tests/wpt/meta/html/webappapis/dynamic-markup-insertion/document-write/module-delayed.html.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[module-delayed.html]
-  [async document.write in a module]
-    expected: FAIL
diff --git a/tests/wpt/meta/html/webappapis/scripting/events/compile-event-handler-settings-objects.html.ini b/tests/wpt/meta/html/webappapis/scripting/events/compile-event-handler-settings-objects.html.ini
index 1053fb90051..6206f8c0210 100644
--- a/tests/wpt/meta/html/webappapis/scripting/events/compile-event-handler-settings-objects.html.ini
+++ b/tests/wpt/meta/html/webappapis/scripting/events/compile-event-handler-settings-objects.html.ini
@@ -2,6 +2,3 @@
   expected: TIMEOUT
   [The incumbent settings object while executing the compiled callback via Web IDL's invoke must be that of the node document]
     expected: TIMEOUT
-
-  [The entry settings object while executing the compiled callback via Web IDL's invoke must be that of the node document]
-    expected: FAIL
diff --git a/tests/wpt/meta/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/promise-job-entry.html.ini b/tests/wpt/meta/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/promise-job-entry.html.ini
index 8bcf3a07de4..6ab46a7862c 100644
--- a/tests/wpt/meta/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/promise-job-entry.html.ini
+++ b/tests/wpt/meta/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/promise-job-entry.html.ini
@@ -4,10 +4,10 @@
     expected: FAIL
 
   [Rejection handler on pending-then-rejected promise]
-    expected: TIMEOUT
+    expected: FAIL
 
   [Sanity check: this all works as expected with no promises involved]
-    expected: FAIL
+    expected: TIMEOUT
 
   [Thenable resolution]
     expected: FAIL
@@ -16,4 +16,4 @@
     expected: FAIL
 
   [Fulfillment handler on pending-then-fulfilled promise]
-    expected: TIMEOUT
+    expected: FAIL
diff --git a/tests/wpt/meta/uievents/idlharness.window.js.ini b/tests/wpt/meta/uievents/idlharness.window.js.ini
index 6df68cc5a33..22e2d482930 100644
--- a/tests/wpt/meta/uievents/idlharness.window.js.ini
+++ b/tests/wpt/meta/uievents/idlharness.window.js.ini
@@ -154,3 +154,21 @@
 
   [MutationEvent interface: operation initMutationEvent(DOMString, optional boolean, optional boolean, optional Node?, optional DOMString, optional DOMString, optional DOMString, optional unsigned short)]
     expected: FAIL
+
+  [MouseEvent interface: attribute layerX]
+    expected: FAIL
+
+  [MouseEvent interface: attribute layerY]
+    expected: FAIL
+
+  [MouseEvent interface: new MouseEvent("event") must inherit property "layerX" with the proper type]
+    expected: FAIL
+
+  [MouseEvent interface: new MouseEvent("event") must inherit property "layerY" with the proper type]
+    expected: FAIL
+
+  [MouseEvent interface: new WheelEvent("event") must inherit property "layerX" with the proper type]
+    expected: FAIL
+
+  [MouseEvent interface: new WheelEvent("event") must inherit property "layerY" with the proper type]
+    expected: FAIL
diff --git a/tests/wpt/meta/webaudio/idlharness.https.window.js.ini b/tests/wpt/meta/webaudio/idlharness.https.window.js.ini
index b5e9c75e20a..63969725792 100644
--- a/tests/wpt/meta/webaudio/idlharness.https.window.js.ini
+++ b/tests/wpt/meta/webaudio/idlharness.https.window.js.ini
@@ -1303,3 +1303,12 @@
 
   [AudioParamMap interface: maplike<DOMString, AudioParam>]
     expected: FAIL
+
+  [BaseAudioContext interface: attribute renderQuantumSize]
+    expected: FAIL
+
+  [BaseAudioContext interface: context must inherit property "renderQuantumSize" with the proper type]
+    expected: FAIL
+
+  [BaseAudioContext interface: new OfflineAudioContext(1, 1, sample_rate) must inherit property "renderQuantumSize" with the proper type]
+    expected: FAIL
diff --git a/tests/wpt/meta/webaudio/the-audio-api/the-audioparam-interface/moderate-exponentialRamp.html.ini b/tests/wpt/meta/webaudio/the-audio-api/the-audioparam-interface/moderate-exponentialRamp.html.ini
new file mode 100644
index 00000000000..4880a89bc1a
--- /dev/null
+++ b/tests/wpt/meta/webaudio/the-audio-api/the-audioparam-interface/moderate-exponentialRamp.html.ini
@@ -0,0 +1,3 @@
+[moderate-exponentialRamp.html]
+  [Test exponentialRampToValueAtTime() with a moderate ratio of change]
+    expected: FAIL
diff --git a/tests/wpt/meta/webgl/idlharness.any.js.ini b/tests/wpt/meta/webgl/idlharness.any.js.ini
index 6447307c2e8..51c3f3177a7 100644
--- a/tests/wpt/meta/webgl/idlharness.any.js.ini
+++ b/tests/wpt/meta/webgl/idlharness.any.js.ini
@@ -3884,6 +3884,9 @@
   [WebGL2RenderingContext interface: attribute unpackColorSpace]
     expected: FAIL
 
+  [WebGL2RenderingContext interface: operation getBufferSubData(GLenum, GLintptr, ArrayBufferView, optional unsigned long long, optional GLuint)]
+    expected: FAIL
+
 
 [idlharness.any.worker.html]
   [WebGLRenderingContext includes WebGLRenderingContextOverloads: member names are unique]
@@ -10149,3 +10152,6 @@
 
   [WebGL2RenderingContext interface: attribute unpackColorSpace]
     expected: FAIL
+
+  [WebGL2RenderingContext interface: operation getBufferSubData(GLenum, GLintptr, ArrayBufferView, optional unsigned long long, optional GLuint)]
+    expected: FAIL
diff --git a/tests/wpt/meta/webmessaging/without-ports/018.html.ini b/tests/wpt/meta/webmessaging/without-ports/018.html.ini
deleted file mode 100644
index b7b36c1d3a4..00000000000
--- a/tests/wpt/meta/webmessaging/without-ports/018.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[018.html]
-  expected: TIMEOUT
-  [origin of the script that invoked the method, javascript:]
-    expected: TIMEOUT
diff --git a/tests/wpt/meta/workers/shared-worker-partitioned-cookies.tentative.https.html.ini b/tests/wpt/meta/workers/shared-worker-partitioned-cookies.tentative.https.html.ini
new file mode 100644
index 00000000000..0f221c965c3
--- /dev/null
+++ b/tests/wpt/meta/workers/shared-worker-partitioned-cookies.tentative.https.html.ini
@@ -0,0 +1,3 @@
+[shared-worker-partitioned-cookies.tentative.https.html]
+  [SharedWorker: Partitioned Cookies]
+    expected: FAIL
diff --git a/tests/wpt/tests/WebCryptoAPI/import_export/okp_importKey.https.any.js b/tests/wpt/tests/WebCryptoAPI/import_export/okp_importKey.https.any.js
index a0ec3e81c87..a56bd31cbe1 100644
--- a/tests/wpt/tests/WebCryptoAPI/import_export/okp_importKey.https.any.js
+++ b/tests/wpt/tests/WebCryptoAPI/import_export/okp_importKey.https.any.js
@@ -81,6 +81,11 @@
                     }
 
                     testFormat(format, algorithm, data, vector.name, usages, extractable);
+
+                    // Test for https://github.com/WICG/webcrypto-secure-curves/pull/24
+                    if (format === "jwk" && extractable) {
+                        testJwkAlgBehaviours(algorithm, data.jwk, vector.name, usages);
+                    }
                 });
 
             });
@@ -92,6 +97,11 @@
                     var data = keyData[vector.name];
 
                     testFormat(format, algorithm, data, vector.name, usages, extractable);
+
+                    // Test for https://github.com/WICG/webcrypto-secure-curves/pull/24
+                    if (format === "jwk" && extractable) {
+                        testJwkAlgBehaviours(algorithm, data.jwk, vector.name, usages);
+                    }
                 });
             });
         });
@@ -126,6 +136,28 @@
         }, "Good parameters: " + keySize.toString() + " bits " + parameterString(format, keyData[format], algorithm, extractable, usages));
     }
 
+    // Test importKey/exportKey "alg" behaviours, alg is ignored upon import and alg is missing for Ed25519 and Ed448 JWK export
+    // https://github.com/WICG/webcrypto-secure-curves/pull/24
+    function testJwkAlgBehaviours(algorithm, keyData, crv, usages) {
+        promise_test(function(test) {
+            return subtle.importKey('jwk', { ...keyData, alg: 'this is ignored' }, algorithm, true, usages).
+            then(function(key) {
+                assert_equals(key.constructor, CryptoKey, "Imported a CryptoKey object");
+
+                return subtle.exportKey('jwk', key).
+                then(function(result) {
+                    assert_equals(Object.keys(result).length, keyData.d ? 6 : 5, "Correct number of JWK members");
+                    assert_equals(result.alg, undefined, 'No JWK "alg" member is present');
+                    assert_true(equalJwk(keyData, result), "Round trip works");
+                }, function(err) {
+                    assert_unreached("Threw an unexpected error: " + err.toString());
+                });
+            }, function(err) {
+                assert_unreached("Threw an unexpected error: " + err.toString());
+            });
+        }, "Good parameters with ignored JWK alg: " + crv.toString() + " " + parameterString('jwk', keyData, algorithm, true, usages));
+    }
+
 
 
     // Helper methods follow:
diff --git a/tests/wpt/tests/WebCryptoAPI/sign_verify/eddsa.js b/tests/wpt/tests/WebCryptoAPI/sign_verify/eddsa.js
index d425fec2dc3..d77a8808831 100644
--- a/tests/wpt/tests/WebCryptoAPI/sign_verify/eddsa.js
+++ b/tests/wpt/tests/WebCryptoAPI/sign_verify/eddsa.js
@@ -167,6 +167,7 @@ function run_test() {
           promise_test(function(test) {
               return subtle.sign(algorithm, vector.privateKey, vector.data)
               .then(function(signature) {
+                  assert_true(equalBuffers(signature, vector.signature), "Signing did not give the expected output");
                   // Can we verify the signature?
                   return subtle.verify(algorithm, vector.publicKey, signature, vector.data)
                   .then(function(is_verified) {
diff --git a/tests/wpt/tests/WebCryptoAPI/sign_verify/hmac.js b/tests/wpt/tests/WebCryptoAPI/sign_verify/hmac.js
index 8df4b042f54..f5e2ad2769c 100644
--- a/tests/wpt/tests/WebCryptoAPI/sign_verify/hmac.js
+++ b/tests/wpt/tests/WebCryptoAPI/sign_verify/hmac.js
@@ -117,6 +117,7 @@ function run_test() {
             promise_test(function(test) {
                 return subtle.sign({name: "HMAC", hash: vector.hash}, vector.key, vector.plaintext)
                 .then(function(signature) {
+                    assert_true(equalBuffers(signature, vector.signature), "Signing did not give the expected output");
                     // Can we get the verify the new signature?
                     return subtle.verify({name: "HMAC", hash: vector.hash}, vector.key, signature, vector.plaintext)
                     .then(function(is_verified) {
diff --git a/tests/wpt/tests/accname/name/comp_embedded_control.html b/tests/wpt/tests/accname/name/comp_embedded_control.html
index 09856ef662e..2cdb5cbdf7d 100644
--- a/tests/wpt/tests/accname/name/comp_embedded_control.html
+++ b/tests/wpt/tests/accname/name/comp_embedded_control.html
@@ -13,24 +13,119 @@
 
 <p>Tests the <a href="https://w3c.github.io/accname/#comp_embedded_control">#comp_embedded_control</a> portions of the AccName <em>Name Computation</em> algorithm.</p>
 
+<!-- Textfield (textbox) -->
 <label>
   <input type="checkbox" data-expectedlabel="Flash the screen 3 times" data-testname="checkbox label with embedded textfield" class="ex">
   Flash the screen
   <input value="3" aria-label="number of times" data-expectedlabel="number of times" data-testname="label of embedded textfield inside checkbox label" class="ex"> times
 </label>
+<br><br>
+
+<!-- HTML select:not([size]) element renders as menu button (on Mac) or single-row listbox (on Windows/Linux) -->
+<label>
+  <input type="checkbox" data-expectedlabel="Flash the screen 3 times" data-testname="checkbox label with embedded select:not([size])" class="ex">
+  Flash the screen
+  <select aria-label="number of times" data-expectedlabel="number of times" data-testname="label of embedded select:not([size]) inside checkbox label" class="ex">
+    <option value="1">1</option>
+    <option value="2">2</option>
+    <option value="3" selected>3</option>
+    <option value="4">4</option>
+    <option value="5">5</option>
+  </select>
+  times
+</label>
+<br><br>
+
+<!-- HTML select[size] element renders as multi-row listbox -->
+<label>
+  <input type="checkbox" data-expectedlabel="Flash the screen 3 times" data-testname="checkbox label with embedded select[size]" class="ex">
+  Flash the screen
+  <select size=5 aria-label="number of times" data-expectedlabel="number of times" data-testname="label of embedded select[size] inside checkbox label" class="ex">
+    <option value="1">1</option>
+    <option value="2">2</option>
+    <option value="3" selected>3</option>
+    <option value="4">4</option>
+    <option value="5">5</option>
+  </select>
+  times
+</label>
+<br><br>
+
+<!-- ARIA combobox examples (not interactive) -->
+<label>
+  <input type="checkbox" data-expectedlabel="Flash the screen 3 times" data-testname="checkbox label with embedded combobox (input[type=text])" class="ex">
+  Flash the screen
+  <input role="combobox" value="3" aria-label="number of times" data-expectedlabel="number of times" data-testname="label of embedded combobox (input[type=text]) inside checkbox label" class="ex"> times
+</label>
+<br><br>
+<label>
+  <input type="checkbox" data-expectedlabel="Flash the screen 3 times" data-testname="checkbox label with embedded combobox (span)" class="ex">
+  Flash the screen
+  <span role="combobox" tabindex="0" aria-label="number of times" data-expectedlabel="number of times" data-testname="label of embedded combobox (span) inside checkbox label" class="ex">3</span> times
+</label>
+<br><br>
+<label>
+  <input type="checkbox" data-expectedlabel="Flash the screen 3 times" data-testname="checkbox label with embedded combobox (div)" class="ex">
+  Flash the screen
+  <div style="display: inline-block;" role="combobox" tabindex="0" aria-label="number of times" data-expectedlabel="number of times" data-testname="label of embedded combobox (div) inside checkbox label" class="ex">3</div> times
+</label>
+<br><br>
+<!-- Todo: we may want another combobox example using aria-activedescendant? -->
 
 
-<!--
+<!-- ARIA listbox examples (not interactive) -->
+<label>
+  <input type="checkbox" data-expectedlabel="Flash the screen 3 times" data-testname="checkbox label with embedded listbox>option[aria-selected=true]" class="ex">
+  Flash the screen
+  <ul role="listbox" aria-label="number of times" data-expectedlabel="number of times" data-testname="label of embedded listbox>option[aria-selected=true] inside checkbox label" class="ex" style="padding:0; list-style:none; border: solid 1px gray; width: 15em; display: inline-block;">
+    <li role="option" tabindex="-1" style="padding:0.2em 0.8em; list-style:none;">1</li>
+    <li role="option" tabindex="-1" style="padding:0.2em 0.8em; list-style:none;">2</li>
+    <li role="option" tabindex="0" aria-selected="true" style="padding:0.2em 0.8em; list-style:none; color: white; background-color: #555;">3</li>
+    <li role="option" tabindex="-1" style="padding:0.2em 0.8em; list-style:none;">4</li>
+    <li role="option" tabindex="-1" style="padding:0.2em 0.8em; list-style:none;">5</li>
+  </ul> times
+</label>
+<br><br>
 
-Todo: test all remaining cases of https://w3c.github.io/accname/#comp_embedded_control
- - comp_embedded_control_textbox
- - comp_embedded_control_combobox_or_listbox
- - comp_embedded_control_range
- - comp_embedded_control_range_valuetext
- - comp_embedded_control_range_valuenow
- - comp_embedded_control_range_host_language_value
 
--->
+<!-- Ranges: HTML native and ARIA sliders and steppers (valuetext, valuenow, host language specific) -->
+<label>
+  <input type="checkbox" data-expectedlabel="Flash the screen 3 times" data-testname="checkbox label with embedded input[type=range]" class="ex">
+  Flash the screen
+  <input type ="range" min="1" max="5" value="3" step="1" aria-label="number of times" data-expectedlabel="number of times" data-testname="label of embedded input[type=range] inside checkbox label" class="ex"> times
+</label>
+<br><br>
+<label>
+  <input type="checkbox" data-expectedlabel="Flash the screen 3 times" data-testname="checkbox label with embedded input[type=number]" class="ex">
+  Flash the screen
+  <input type ="number" min="1" max="5" value="3" step="1" aria-label="number of times" data-expectedlabel="number of times" data-testname="label of embedded input[type=number] inside checkbox label" class="ex"> times
+</label>
+<br><br>
+<label>
+  <input type="checkbox" data-expectedlabel="Flash the screen 3 times" data-testname="checkbox label with embedded ARIA slider (aria-valuenow)" class="ex">
+  Flash the screen
+  <span tabindex="0" role="slider" aria-valuemin="1" aria-valuemax="5" aria-valuenow="3" aria-label="number of times" data-expectedlabel="number of times" data-testname="label of embedded ARIA slider (aria-valuenow) inside checkbox label" class="ex">3.0</span> times
+</label>
+<br><br>
+<label>
+  <input type="checkbox" data-expectedlabel="Flash the screen 3 times" data-testname="checkbox label with embedded ARIA slider (aria-valuetext)" class="ex">
+  Flash the screen
+  <span tabindex="0" role="slider" aria-valuemin="1.0" aria-valuemax="5.0" aria-valuenow="3.0" aria-valuetext="3" aria-label="number of times" data-expectedlabel="number of times" data-testname="label of embedded ARIA slider (aria-valuetext) inside checkbox label" class="ex">3.0</span> times
+</label>
+<br><br>
+<label>
+  <input type="checkbox" data-expectedlabel="Flash the screen 3 times" data-testname="checkbox label with embedded ARIA spinbutton (aria-valuenow)" class="ex">
+  Flash the screen
+  <span tabindex="0" role="spinbutton" aria-valuemin="1" aria-valuemax="5" aria-valuenow="3" aria-label="number of times" data-expectedlabel="number of times" data-testname="label of embedded ARIA spinbutton (aria-valuenow) inside checkbox label" class="ex">3.0</span> times
+</label>
+<br><br>
+<label>
+  <input type="checkbox" data-expectedlabel="Flash the screen 3 times" data-testname="checkbox label with embedded ARIA spinbutton (aria-valuetext)" class="ex">
+  Flash the screen
+  <span tabindex="0" role="spinbutton" aria-valuemin="1.0" aria-valuemax="5.0" aria-valuenow="3.0" aria-valuetext="3" aria-label="number of times" data-expectedlabel="number of times" data-testname="label of embedded ARIA spinbutton (aria-valuetext) inside checkbox label" class="ex">3.0</span> times
+</label>
+<br><br>
+
 
 <script>
 AriaUtils.verifyLabelsBySelector(".ex");
diff --git a/tests/wpt/tests/accname/name/comp_hidden_not_referenced.html b/tests/wpt/tests/accname/name/comp_hidden_not_referenced.html
index 84a2a2ca802..7d9cf2c36f6 100644
--- a/tests/wpt/tests/accname/name/comp_hidden_not_referenced.html
+++ b/tests/wpt/tests/accname/name/comp_hidden_not_referenced.html
@@ -1,6 +1,7 @@
 <!doctype html>
 <html>
 <head>
+  <meta charset="utf-8">
   <title>Name Comp: Hidden Not Referenced</title>
   <script src="/resources/testharness.js"></script>
   <script src="/resources/testharnessreport.js"></script>
@@ -13,16 +14,79 @@
 
 <p>Tests the <a href="https://w3c.github.io/accname/#comp_hidden_not_referenced">#comp_hidden_not_referenced</a> portions of the AccName <em>Name Computation</em> algorithm.</p>
 
-<h2 class="ex" data-expectedlabel="heading label" data-testname="heading with interior hidden node">
-  heading
-  <span hidden>bogus</span>
-  label
+<button
+  class="ex"
+  data-expectedlabel="visible to all users"
+  data-testname="button containing a rendered, unreferenced element that is aria-hidden=true, an unreferenced element with the hidden host language attribute, and an unreferenced element that is unconditionally rendered"
+>
+  <span aria-hidden="true">hidden,</span>
+  <span hidden>hidden from all users,</span>
+  <span>visible to all users</span>
+</button>
+
+<button
+  class="ex"
+  data-expectedlabel="hidden but referenced,"
+  data-testname="button labelled by element that is aria-hidden=true"
+  aria-labelledby="button-label-2"
+>
+  <span aria-hidden="true" id="button-label-2">hidden but referenced,</span>
+  <span hidden>hidden from all users,</span>
+  <span>visible to all users</span>
+</button>
+
+<button
+  class="ex"
+  data-expectedlabel="hidden from all users but referenced,"
+  data-testname="button labelled by element with the hidden host language attribute"
+  aria-labelledby="button-label-3"
+>
+  <span aria-hidden="true">hidden,</span>
+  <span hidden id="button-label-3">hidden from all users but referenced,</span>
+  <span>visible to all users</span>
+</button>
+
+<a
+  class="ex"
+  data-testname="link labelled by elements with assorted visibility and a11y tree exposure"
+  data-expectedlabel="visible to all users, hidden but referenced, hidden from all users but referenced"
+  href="#"
+  aria-labelledby="link-label-1a link-label-1b link-label-1c"
+>
+  <span id="link-label-1a">
+    <span>visible to all users,</span>
+    <span aria-hidden="true">hidden,</span>
+  </span>
+  <span aria-hidden="true" id="link-label-1b">hidden but referenced,</span>
+  <span hidden id="link-label-1c">hidden from all users but referenced</span>
+</a>
+
+<h2
+  class="ex"
+  data-testname="heading with name from content, containing element that is visibility:hidden with nested content that is visibility:visible"
+  data-expectedlabel="visible to all users, un-hidden for all users"
+>
+  visible to all users,
+  <span style="visibility: hidden;">
+    hidden from all users,
+    <span style="visibility: visible;">un-hidden for all users</span>
+  </span>
 </h2>
 
-<!-- Todo: test all remaining cases of https://w3c.github.io/accname/#comp_hidden_not_referenced -->
+<!-- TODO: Test cases once https://github.com/w3c/aria/issues/1256 resolved: -->
+<!--       - button labelled by an element that is aria-hidden=true which contains a nested child that is aria-hidden=false -->
+<!--       - button labelled by an element that is aria-hidden=false which belongs to a parent that is aria-hidden=true -->
+<!--       - heading with name from content, containing rendered content that is aria-hidden=true with nested, rendered content that is aria-hidden=false -->
+<!--       - heading with name from content, containing element with the hidden host language attribute with nested content that is aria-hidden=false -->
+
+<!-- TODO: New test case?
+<!--       What is the expectation for a details element when it’s given an -->
+<!--       explicit role that allows name from contents (e.g., `comment`) -->
+<!--       but is also not in the open state, and therefore has contents -->
+<!--       that are both not rendered and excluded from the a11y tree. -->
 
 <script>
 AriaUtils.verifyLabelsBySelector(".ex");
 </script>
 </body>
-</html>
\ No newline at end of file
+</html>
diff --git a/tests/wpt/tests/clipboard-apis/async-unsanitized-standard-html-formats-write-read.tentative.https.html b/tests/wpt/tests/clipboard-apis/async-unsanitized-standard-html-formats-write-read.tentative.https.html
deleted file mode 100644
index 0eb97926bc0..00000000000
--- a/tests/wpt/tests/clipboard-apis/async-unsanitized-standard-html-formats-write-read.tentative.https.html
+++ /dev/null
@@ -1,64 +0,0 @@
-<!doctype html>
-<meta charset="utf-8">
-<title>Async Clipboard unsanitized HTML write -> Async Clipboard unsanitized HTML read test</title>
-<link rel="help" href="https://w3c.github.io/clipboard-apis/#async-clipboard-api">
-<body>Body needed for test_driver.click()</body>
-<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 src="resources/user-activation.js"></script>
-<script>
-'use strict';
-
-// This function removes extra spaces between tags in html. For example, the
-// following html: "<p> Hello </p>   <body> World </body>" would turn into this
-//           html: "<p> Hello </p> <body> World </body>"
-// We remove the extra spaces because in html they are considered equivalent,
-// but when we are comparing for equality the spaces make a difference.
-function reformatHtml(html) {
-  const parser = new DOMParser();
-  const htmlString =
-        parser.parseFromString(html, 'text/html').documentElement.innerHTML;
-  const reformattedString = htmlString.replace(/\>\s*\</g, '> <').replace(/<!--[a-zA-Z]*?-->/g, '');
-  return reformattedString;
-}
-
-// Writes a payload with HTML content and checks to ensure the correct data
-// was written successfully.
-promise_test(async t => {
-  await test_driver.set_permission({name: 'clipboard-read'}, 'granted');
-  await test_driver.set_permission({name: 'clipboard-write'}, 'granted');
-
-  // Create and write unsanitized version of standard HTML format.
-  const format1 = 'text/html';
-  // The string must be concatenated in this way because the html parser
-  // will recognize a script tag even in quotes as a real script tag. By
-  // splitting it up in this way we avoid that error.
-  const html_script = '<script>const a = 5;</scr'
-                          + 'ipt> <p>Hello World</p>';
-  const textInput = '<head><style>color:blue</style><head>' +
-                    '<body><p>Hello</p>' + html_script + '</body>';
-  const blobInput1 = new Blob([textInput], {type: format1});
-  const clipboardItemInput = new ClipboardItem({[format1]: blobInput1});
-  await waitForUserActivation();
-  await navigator.clipboard.write([clipboardItemInput]);
-
-  // Read unsanitized version of HTML format.
-  await waitForUserActivation();
-  const clipboardItems =
-    await navigator.clipboard.read({unsanitized: ["text/html"]});
-  assert_equals(clipboardItems.length, 1);
-  const clipboardItem = clipboardItems[0];
-  assert_true(clipboardItem instanceof ClipboardItem);
-
-  const blobOutput1 = await clipboardItem.getType(format1);
-  assert_equals(blobOutput1.type, format1);
-
-  const data1 = await (new Response(blobOutput1)).text();
-  const outputHtml = reformatHtml(data1);
-  const expectedHtml = '<html>' + textInput + '</html>';
-  const unsanitizedExpectedHtml = reformatHtml(expectedHtml);
-  assert_equals(outputHtml, unsanitizedExpectedHtml);
-}, 'Verify write and read unsanitized content to the clipboard given text/html format as input');
-</script>
diff --git a/tests/wpt/tests/css/css-align/parsing/align-tracks-computed.html b/tests/wpt/tests/css/css-align/parsing/align-tracks-computed.html
deleted file mode 100644
index 76241f694af..00000000000
--- a/tests/wpt/tests/css/css-align/parsing/align-tracks-computed.html
+++ /dev/null
@@ -1,37 +0,0 @@
-<!DOCTYPE html>
-<html>
-<head>
-<meta charset="utf-8">
-<title>CSS Grid Level 3: getComputedStyle().alignContent</title>
-<link rel="help" href="https://drafts.csswg.org/css-grid-3/#tracks-alignment">
-<meta name="assert" content="align-tracks computed value is as specified.">
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-<script src="/css/support/computed-testcommon.js"></script>
-</head>
-<body>
-
-<div id="target"></div>
-<script>
-test_computed_value("align-tracks", "normal");
-
-test_computed_value("align-tracks", "baseline");
-test_computed_value("align-tracks", "last baseline");
-
-test_computed_value("align-tracks", "space-between");
-test_computed_value("align-tracks", "space-around");
-test_computed_value("align-tracks", "space-evenly");
-test_computed_value("align-tracks", "stretch");
-
-test_computed_value("align-tracks", "center");
-test_computed_value("align-tracks", "start");
-test_computed_value("align-tracks", "end");
-test_computed_value("align-tracks", "flex-start");
-test_computed_value("align-tracks", "flex-end");
-test_computed_value("align-tracks", "unsafe end");
-test_computed_value("align-tracks", "safe flex-start");
-
-test_computed_value("align-tracks", "normal, normal", "normal")
-</script>
-</body>
-</html>
diff --git a/tests/wpt/tests/css/css-align/parsing/align-tracks-invalid.html b/tests/wpt/tests/css/css-align/parsing/align-tracks-invalid.html
deleted file mode 100644
index 68f38f5a61c..00000000000
--- a/tests/wpt/tests/css/css-align/parsing/align-tracks-invalid.html
+++ /dev/null
@@ -1,41 +0,0 @@
-<!DOCTYPE html>
-<html>
-<head>
-<meta charset="utf-8">
-<title>CSS Grid Level 3: parsing align-tracks with invalid values</title>
-<link rel="help" href="https://drafts.csswg.org/css-grid-3/#tracks-alignment">
-<meta name="assert" content="align-tracks supports only the grammar 'normal | <baseline-position> | <content-distribution> | <overflow-position>? <content-position>'.">
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-<script src="/css/support/parsing-testcommon.js"></script>
-</head>
-<body>
-<script>
-test_invalid_value("align-tracks", "auto");
-test_invalid_value("align-tracks", "baseline last");
-test_invalid_value("align-tracks", "center baseline");
-test_invalid_value("align-tracks", "first");
-test_invalid_value("align-tracks", "flex-start flex-end");
-test_invalid_value("align-tracks", "last");
-test_invalid_value("align-tracks", "left");
-test_invalid_value("align-tracks", "legacy center");
-test_invalid_value("align-tracks", "legacy left");
-test_invalid_value("align-tracks", "legacy");
-test_invalid_value("align-tracks", "normal baseline");
-test_invalid_value("align-tracks", "right legacy");
-test_invalid_value("align-tracks", "safe self-end");
-test_invalid_value("align-tracks", "safe");
-test_invalid_value("align-tracks", "self-end unsafe");
-test_invalid_value("align-tracks", "self-start");
-test_invalid_value("align-tracks", "start safe");
-test_invalid_value("align-tracks", "unsafe right");
-test_invalid_value("align-tracks", "unsafe");
-
-test_invalid_value("align-tracks", "auto, left");
-test_invalid_value("align-tracks", "foo, auto");
-test_invalid_value("align-tracks", "start, left, end");
-test_invalid_value("align-tracks", "left, start, end");
-test_invalid_value("align-tracks", "start, end, left");
-</script>
-</body>
-</html>
diff --git a/tests/wpt/tests/css/css-align/parsing/align-tracks-valid.html b/tests/wpt/tests/css/css-align/parsing/align-tracks-valid.html
deleted file mode 100644
index 1c9a8b040cd..00000000000
--- a/tests/wpt/tests/css/css-align/parsing/align-tracks-valid.html
+++ /dev/null
@@ -1,44 +0,0 @@
-<!DOCTYPE html>
-<html>
-<head>
-<meta charset="utf-8">
-<title>CSS Grid Level 3: parsing align-tracks with valid values</title>
-<link rel="help" href="https://drafts.csswg.org/css-grid-3/#tracks-alignment">
-<meta name="assert" content="align-tracks supports the full grammar 'normal | <baseline-position> | <content-distribution> | <overflow-position>? <content-position>'.">
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-<script src="/css/support/parsing-testcommon.js"></script>
-</head>
-<body>
-<script>
-test_valid_value("align-tracks", "normal");
-
-// <baseline-position> = [ first | last ]? baseline
-test_valid_value("align-tracks", "baseline");
-test_valid_value("align-tracks", "first baseline", "baseline");
-test_valid_value("align-tracks", "last baseline");
-
-// <content-distribution> = space-between | space-around | space-evenly | stretch
-test_valid_value("align-tracks", "space-between");
-test_valid_value("align-tracks", "space-around");
-test_valid_value("align-tracks", "space-evenly");
-test_valid_value("align-tracks", "stretch");
-
-// <overflow-position>? <content-position>
-// <overflow-position> = unsafe | safe
-// <content-position> = center | start | end | flex-start | flex-end
-test_valid_value("align-tracks", "center");
-test_valid_value("align-tracks", "start");
-test_valid_value("align-tracks", "end");
-test_valid_value("align-tracks", "flex-start");
-test_valid_value("align-tracks", "flex-end");
-test_valid_value("align-tracks", "unsafe end");
-test_valid_value("align-tracks", "safe flex-start");
-
-test_valid_value("align-tracks", "flex-start, last baseline");
-test_valid_value("align-tracks", "normal, normal", "normal");
-test_valid_value("align-tracks", "start, flex-end, flex-end, flex-end, flex-end", "start, flex-end");
-
-</script>
-</body>
-</html>
diff --git a/tests/wpt/tests/css/css-align/parsing/justify-tracks-computed.html b/tests/wpt/tests/css/css-align/parsing/justify-tracks-computed.html
deleted file mode 100644
index 372d17c9101..00000000000
--- a/tests/wpt/tests/css/css-align/parsing/justify-tracks-computed.html
+++ /dev/null
@@ -1,35 +0,0 @@
-<!DOCTYPE html>
-<html>
-<head>
-<meta charset="utf-8">
-<title>CSS Grid Level 3: getComputedStyle().justifyContent</title>
-<link rel="help" href="https://drafts.csswg.org/css-grid-3/#tracks-alignment">
-<meta name="assert" content="justify-tracks computed value is as specified.">
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-<script src="/css/support/computed-testcommon.js"></script>
-</head>
-<body>
-<div id="target"></div>
-<script>
-test_computed_value("justify-tracks", "normal");
-
-test_computed_value("justify-tracks", "space-between");
-test_computed_value("justify-tracks", "space-around");
-test_computed_value("justify-tracks", "space-evenly");
-test_computed_value("justify-tracks", "stretch");
-
-test_computed_value("justify-tracks", "center");
-test_computed_value("justify-tracks", "start");
-test_computed_value("justify-tracks", "end");
-test_computed_value("justify-tracks", "flex-start");
-test_computed_value("justify-tracks", "flex-end");
-test_computed_value("justify-tracks", "unsafe end");
-test_computed_value("justify-tracks", "safe flex-start");
-test_computed_value("justify-tracks", "left");
-test_computed_value("justify-tracks", "unsafe right");
-
-test_computed_value("justify-tracks", "normal, normal", "normal")
-</script>
-</body>
-</html>
diff --git a/tests/wpt/tests/css/css-align/parsing/justify-tracks-invalid.html b/tests/wpt/tests/css/css-align/parsing/justify-tracks-invalid.html
deleted file mode 100644
index a1dc2cc7388..00000000000
--- a/tests/wpt/tests/css/css-align/parsing/justify-tracks-invalid.html
+++ /dev/null
@@ -1,42 +0,0 @@
-<!DOCTYPE html>
-<html>
-<head>
-<meta charset="utf-8">
-<title>CSS Grid Level 3: parsing justify-tracks with invalid values</title>
-<link rel="help" href="https://drafts.csswg.org/css-grid-3/#tracks-alignment">
-<meta name="assert" content="justify-tracks supports only the grammar 'normal | <content-distribution> | <overflow-position>? [ <content-position> | left | right ]'.">
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-<script src="/css/support/parsing-testcommon.js"></script>
-</head>
-<body>
-<script>
-test_invalid_value("justify-tracks", "auto");
-test_invalid_value("justify-tracks", "baseline last");
-test_invalid_value("justify-tracks", "baseline");
-test_invalid_value("justify-tracks", "center baseline");
-test_invalid_value("justify-tracks", "first baseline");
-test_invalid_value("justify-tracks", "first");
-test_invalid_value("justify-tracks", "flex-start flex-end");
-test_invalid_value("justify-tracks", "last baseline");
-test_invalid_value("justify-tracks", "last");
-test_invalid_value("justify-tracks", "legacy center");
-test_invalid_value("justify-tracks", "legacy left");
-test_invalid_value("justify-tracks", "legacy");
-test_invalid_value("justify-tracks", "normal baseline");
-test_invalid_value("justify-tracks", "right legacy");
-test_invalid_value("justify-tracks", "safe self-end");
-test_invalid_value("justify-tracks", "safe");
-test_invalid_value("justify-tracks", "self-end unsafe");
-test_invalid_value("justify-tracks", "self-start");
-test_invalid_value("justify-tracks", "start safe");
-test_invalid_value("justify-tracks", "unsafe");
-
-test_invalid_value("align-tracks", "auto, left");
-test_invalid_value("align-tracks", "foo, auto");
-test_invalid_value("align-tracks", "start, foo, end");
-test_invalid_value("align-tracks", "first, start, end");
-test_invalid_value("align-tracks", "start, end, unsafe");
-</script>
-</body>
-</html>
diff --git a/tests/wpt/tests/css/css-align/parsing/justify-tracks-valid.html b/tests/wpt/tests/css/css-align/parsing/justify-tracks-valid.html
deleted file mode 100644
index be4f426f144..00000000000
--- a/tests/wpt/tests/css/css-align/parsing/justify-tracks-valid.html
+++ /dev/null
@@ -1,41 +0,0 @@
-<!DOCTYPE html>
-<html>
-<head>
-<meta charset="utf-8">
-<title>CSS Grid Level 3: parsing justify-tracks with valid values</title>
-<link rel="help" href="https://drafts.csswg.org/css-grid-3/#tracks-alignment">
-<meta name="assert" content="justify-tracks supports the full grammar 'normal | <content-distribution> | <overflow-position>? [ <content-position> | left | right ]'.">
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-<script src="/css/support/parsing-testcommon.js"></script>
-</head>
-<body>
-<script>
-test_valid_value("justify-tracks", "normal");
-
-// <content-distribution> = space-between | space-around | space-evenly | stretch
-test_valid_value("justify-tracks", "space-between");
-test_valid_value("justify-tracks", "space-around");
-test_valid_value("justify-tracks", "space-evenly");
-test_valid_value("justify-tracks", "stretch");
-
-// <overflow-position>? [ <content-position> | left | right ]
-// <overflow-position> = unsafe | safe
-// <content-position> = center | start | end | flex-start | flex-end
-test_valid_value("justify-tracks", "center");
-test_valid_value("justify-tracks", "start");
-test_valid_value("justify-tracks", "end");
-test_valid_value("justify-tracks", "flex-start");
-test_valid_value("justify-tracks", "flex-end");
-test_valid_value("justify-tracks", "unsafe end");
-test_valid_value("justify-tracks", "safe flex-start");
-test_valid_value("justify-tracks", "left");
-test_valid_value("justify-tracks", "unsafe right");
-
-test_valid_value("justify-tracks", "flex-start, last baseline");
-test_valid_value("justify-tracks", "normal, normal", "normal");
-test_valid_value("justify-tracks", "start, flex-end, flex-end, flex-end, flex-end", "start, flex-end");
-
-</script>
-</body>
-</html>
diff --git a/tests/wpt/tests/css/css-anchor-position/anchor-center-001.html b/tests/wpt/tests/css/css-anchor-position/anchor-center-001.html
new file mode 100644
index 00000000000..f8583e68c00
--- /dev/null
+++ b/tests/wpt/tests/css/css-anchor-position/anchor-center-001.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<title>Tests the anchor-center keyword is parsed and computed as specified</title>
+<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#anchor-center">
+<link rel="author" href="mailto:xiaochengh@chromium.org">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+<script src="/css/support/computed-testcommon.js"></script>
+
+<div id="container">
+  <div id="target"></div>
+</div>
+
+<script>
+test_valid_value('align-self', 'anchor-center');
+test_valid_value('align-items', 'anchor-center');
+test_valid_value('justify-self', 'anchor-center');
+test_valid_value('justify-items', 'anchor-center');
+
+test_computed_value('align-self', 'anchor-center');
+test_computed_value('align-items', 'anchor-center');
+test_computed_value('justify-self', 'anchor-center');
+test_computed_value('justify-items', 'anchor-center');
+</script>
diff --git a/tests/wpt/tests/css/css-anchor-position/anchor-center-002-ref.html b/tests/wpt/tests/css/css-anchor-position/anchor-center-002-ref.html
new file mode 100644
index 00000000000..40ccc2b044b
--- /dev/null
+++ b/tests/wpt/tests/css/css-anchor-position/anchor-center-002-ref.html
@@ -0,0 +1,49 @@
+<!DOCTYPE html>
+<title>Tests that 'anchor-center' behaves as 'center' in non-OOF layout modes</title>
+
+<style>
+.container {
+  width: 100px;
+  height: 100px;
+  background: orange;
+  margin-block: 5px;
+}
+
+.item {
+  width: 40px;
+  height: 40px;
+  background: lime;
+}
+
+.flex {
+  display: flex;
+}
+
+.grid {
+  display: grid;
+  grid-template-columns: repeat(8, 1fr);
+  grid-auto-rows: 50px;
+  grid-template-areas:
+    "a a a a b b b b"
+    "a a a a b b b b";
+}
+</style>
+
+<div class="flex container" style="align-items: center">
+  <div class="item"></div>
+</div>
+
+<div class="flex container">
+  <div class="item" style="align-self: center"></div>
+</div>
+
+<div class="grid container"
+     style="align-items: center; justify-items: center">
+  <div class="item" style="grid-area: a"></div>
+  <div class="item" style="grid-area: b"></div>
+</div>
+
+<div class="grid container">
+  <div class="item" style="grid-area: a; align-self: center"></div>
+  <div class="item" style="grid-area: b; justify-self: center"></div>
+</div>
diff --git a/tests/wpt/tests/css/css-anchor-position/anchor-center-002.html b/tests/wpt/tests/css/css-anchor-position/anchor-center-002.html
new file mode 100644
index 00000000000..b7f61003a67
--- /dev/null
+++ b/tests/wpt/tests/css/css-anchor-position/anchor-center-002.html
@@ -0,0 +1,52 @@
+<!DOCTYPE html>
+<title>Tests that 'anchor-center' behaves as 'center' in non-OOF layout modes</title>
+<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#anchor-center">
+<link rel="match" href="anchor-center-002-ref.html">
+<link rel="author" href="mailto:xiaochengh@chromium.org">
+
+<style>
+.container {
+  width: 100px;
+  height: 100px;
+  background: orange;
+  margin-block: 5px;
+}
+
+.item {
+  width: 40px;
+  height: 40px;
+  background: lime;
+}
+
+.flex {
+  display: flex;
+}
+
+.grid {
+  display: grid;
+  grid-template-columns: repeat(8, 1fr);
+  grid-auto-rows: 50px;
+  grid-template-areas:
+    "a a a a b b b b"
+    "a a a a b b b b";
+}
+</style>
+
+<div class="flex container" style="align-items: anchor-center">
+  <div class="item"></div>
+</div>
+
+<div class="flex container">
+  <div class="item" style="align-self: anchor-center"></div>
+</div>
+
+<div class="grid container"
+     style="align-items: anchor-center; justify-items: anchor-center">
+  <div class="item" style="grid-area: a"></div>
+  <div class="item" style="grid-area: b"></div>
+</div>
+
+<div class="grid container">
+  <div class="item" style="grid-area: a; align-self: center"></div>
+  <div class="item" style="grid-area: b; justify-self: center"></div>
+</div>
diff --git a/tests/wpt/tests/css/css-anchor-position/anchor-scroll-006.html b/tests/wpt/tests/css/css-anchor-position/anchor-scroll-006.html
new file mode 100644
index 00000000000..2ffd026b552
--- /dev/null
+++ b/tests/wpt/tests/css/css-anchor-position/anchor-scroll-006.html
@@ -0,0 +1,137 @@
+<!DOCTYPE html>
+<title>Tests that scroll adjustment is applied per-axis</title>
+<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#needs-scroll-adjustment">
+<link rel="author" href="mailto:xiaochengh@chromium.org">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="support/test-common.js"></script>
+
+<style>
+body {
+  margin: 0;
+}
+
+.scroller {
+  width: 150px;
+  height: 150px;
+  margin-bottom: 50px;
+  overflow: scroll;
+  position: relative;
+}
+
+.spacer {
+  width: 400px;
+  height: 400px;
+}
+
+.anchor {
+  position: absolute;
+  width: 50px;
+  height: 50px;
+  top: 50px;
+  left: 50px;
+  background: orange;
+}
+
+.target {
+  position: fixed;
+  width: 50px;
+  height: 50px;
+  background: lime;
+}
+
+#scroller1 { anchor-name: --scroller1; }
+#scroller2 { anchor-name: --scroller2; }
+#scroller3 { anchor-name: --scroller3; }
+
+#anchor1 { anchor-name: --a1; }
+#anchor2 { anchor-name: --a2; }
+#anchor3 { anchor-name: --a3; }
+
+/* Needs scroll adjustment in x axis only */
+#target1 {
+  anchor-default: --a1;
+  left: anchor(left);
+  top: anchor(--scroller1 bottom);
+}
+
+/* Needs scroll adjustment in y axis only */
+#target2 {
+  anchor-default: --a2;
+  top: anchor(top);
+  left: anchor(--scroller2 right);
+}
+
+/* No scroll adjustment needed */
+#target3 {
+  anchor-default: --a3;
+  top: anchor(--scroller3 bottom);
+  left: anchor(--scroller3 right);
+}
+</style>
+
+<div class="scroller" id="scroller1">
+  <div class="spacer"></div>
+  <div class="anchor" id="anchor1"></div>
+</div>
+<div class="target" id="target1"></div>
+
+<script>
+promise_test(async () => {
+  await waitUntilNextAnimationFrame();
+  assert_equals(target1.getBoundingClientRect().left, 50);
+  assert_equals(target1.getBoundingClientRect().top, 150);
+
+  scroller1.scrollLeft = 50;
+  await waitUntilNextAnimationFrame();
+  assert_equals(target1.getBoundingClientRect().left, 0);
+
+  scroller1.scrollTop = 50;
+  await waitUntilNextAnimationFrame();
+  assert_equals(target1.getBoundingClientRect().top, 150);
+}, '#target1 is scroll-adjusted in x axis only');
+</script>
+
+<div class="scroller" id="scroller2">
+  <div class="spacer"></div>
+  <div class="anchor" id="anchor2"></div>
+</div>
+<div class="target" id="target2"></div>
+
+<script>
+promise_test(async () => {
+  await waitUntilNextAnimationFrame();
+  assert_equals(target2.getBoundingClientRect().left, 150);
+  assert_equals(target2.getBoundingClientRect().top, 250);
+
+  scroller2.scrollLeft = 50;
+  await waitUntilNextAnimationFrame();
+  assert_equals(target2.getBoundingClientRect().left, 150);
+
+  scroller2.scrollTop = 50;
+  await waitUntilNextAnimationFrame();
+  assert_equals(target2.getBoundingClientRect().top, 200);
+}, '#target2 is scroll-adjusted in y axis only');
+</script>
+
+<div class="scroller" id="scroller3">
+  <div class="spacer"></div>
+  <div class="anchor" id="anchor3"></div>
+</div>
+<div class="target" id="target3"></div>
+
+<script>
+promise_test(async () => {
+  await waitUntilNextAnimationFrame();
+  assert_equals(target3.getBoundingClientRect().left, 150);
+  assert_equals(target3.getBoundingClientRect().top, 550);
+
+  scroller3.scrollLeft = 50;
+  await waitUntilNextAnimationFrame();
+  assert_equals(target3.getBoundingClientRect().left, 150);
+
+  scroller3.scrollTop = 50;
+  await waitUntilNextAnimationFrame();
+  assert_equals(target3.getBoundingClientRect().top, 550);
+}, '#target3 is scroll-adjusted in neither axis');
+</script>
diff --git a/tests/wpt/tests/css/css-anchor-position/anchor-scroll-007.html b/tests/wpt/tests/css/css-anchor-position/anchor-scroll-007.html
new file mode 100644
index 00000000000..ec519106190
--- /dev/null
+++ b/tests/wpt/tests/css/css-anchor-position/anchor-scroll-007.html
@@ -0,0 +1,86 @@
+<!DOCTYPE html>
+<title>Tests that scroll adjustment still applies when using another anchor in default anchor's scroll container</title>
+<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#needs-scroll-adjustment">
+<link rel="author" href="mailto:xiaochengh@chromium.org">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="support/test-common.js"></script>
+
+<style>
+body {
+  margin: 0;
+}
+
+#scroller {
+  width: 400px;
+  height: 400px;
+  overflow: scroll;
+  position: relative;
+}
+
+#spacer {
+  width: 1000px;
+  height: 1000px;
+}
+
+.anchor {
+  width: 50px;
+  height: 50px;
+  position: absolute;
+  background: orange;
+}
+
+#anchor1 {
+  anchor-name: --a1;
+  left: 300px;
+  top: 100px;
+}
+
+#anchor2 {
+  anchor-name: --a2;
+  left: 200px;
+  top: 200px;
+}
+
+#anchor3 {
+  anchor-name: --a3;
+  left: 100px;
+  top: 300px;
+}
+
+/* Uses different anchors in insets instead of the default anchor.
+ * Still scroll-adjusted because they are in the same scroll container. */
+#target {
+  position: fixed;
+  width: 50px;
+  height: 50px;
+  left: anchor(--a3 left);
+  top: anchor(--a1 top);
+  anchor-default: --a2;
+  background: lime;
+}
+</style>
+
+<div id="scroller">
+  <div id="spacer"></div>
+  <div class="anchor" id="anchor1"></div>
+  <div class="anchor" id="anchor2"></div>
+  <div class="anchor" id="anchor3"></div>
+</div>
+<div id="target"></div>
+
+<script>
+promise_test(async () => {
+  await waitUntilNextAnimationFrame();
+  assert_equals(target.getBoundingClientRect().left, 100);
+  assert_equals(target.getBoundingClientRect().top, 100);
+
+  scroller.scrollLeft = 50;
+  await waitUntilNextAnimationFrame();
+  assert_equals(target.getBoundingClientRect().left, 50);
+
+  scroller.scrollTop = 50;
+  await waitUntilNextAnimationFrame();
+  assert_equals(target.getBoundingClientRect().top, 50);
+}, '#target3 is scroll-adjusted in both axises');
+</script>
diff --git a/tests/wpt/tests/css/css-backgrounds/border-image-repeat-001.htm b/tests/wpt/tests/css/css-backgrounds/border-image-repeat-001.htm
deleted file mode 100644
index e447421a89f..00000000000
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diff --git a/tests/wpt/tests/css/css-backgrounds/border-image-repeat-002.htm b/tests/wpt/tests/css/css-backgrounds/border-image-repeat-002.htm
index f1fd6ffbc3b..a0c081863d4 100644
Binary files a/tests/wpt/tests/css/css-backgrounds/border-image-repeat-002.htm and b/tests/wpt/tests/css/css-backgrounds/border-image-repeat-002.htm differ
diff --git a/tests/wpt/tests/css/css-backgrounds/border-image-repeat-003.htm b/tests/wpt/tests/css/css-backgrounds/border-image-repeat-003.htm
deleted file mode 100644
index 255fdfccb96..00000000000
Binary files a/tests/wpt/tests/css/css-backgrounds/border-image-repeat-003.htm and /dev/null differ
diff --git a/tests/wpt/tests/css/css-backgrounds/border-image-repeat-004.htm b/tests/wpt/tests/css/css-backgrounds/border-image-repeat-004.htm
index acf7cfa7b84..40194506940 100644
Binary files a/tests/wpt/tests/css/css-backgrounds/border-image-repeat-004.htm and b/tests/wpt/tests/css/css-backgrounds/border-image-repeat-004.htm differ
diff --git a/tests/wpt/tests/css/css-backgrounds/border-image-slice-004.htm b/tests/wpt/tests/css/css-backgrounds/border-image-slice-004.htm
index 86b3c1e6b1d..1e5adb311f5 100644
Binary files a/tests/wpt/tests/css/css-backgrounds/border-image-slice-004.htm and b/tests/wpt/tests/css/css-backgrounds/border-image-slice-004.htm differ
diff --git a/tests/wpt/tests/css/css-backgrounds/reference/border-image-repeat-002-ref.html b/tests/wpt/tests/css/css-backgrounds/reference/border-image-repeat-002-ref.html
new file mode 100644
index 00000000000..e295a5c65dc
--- /dev/null
+++ b/tests/wpt/tests/css/css-backgrounds/reference/border-image-repeat-002-ref.html
@@ -0,0 +1,54 @@
+<!DOCTYPE html>
+
+  <meta charset="UTF-8">
+
+  <title>CSS Reftest reference</title>
+
+  <link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/">
+
+  <style>
+  table
+    {
+      border-spacing: 0px;
+      margin: 70px;
+      table-layout: fixed;
+    }
+
+  td
+    {
+      height: 40px;
+      padding: 0px;
+    }
+
+  td.corner
+    {
+      background-image: url("../support/new-red-diamond-27x27.png");
+      background-size: cover;
+    }
+
+  td#first-row-second-cell , td#third-row-second-cell , td.second-row
+    {
+      background-image: url("../support/blue-diamond-27x27.png");
+      background-size: 34px 40px;
+    }
+
+  td.second-row
+    {
+      background-size: 40px 34px;
+      height: 102px;
+    }
+  </style>
+
+  <p>Test passes if there are three whole blue diamonds without clipping on four sides of the border.
+
+  <table>
+
+    <col width="40"><col width="102"><col width="40">
+
+    <tr><td class="corner"><td id="first-row-second-cell"><td class="corner">
+
+    <tr><td class="second-row"><td><td class="second-row">
+
+    <tr><td class="corner"><td id="third-row-second-cell"><td class="corner">
+
+  </table>
diff --git a/tests/wpt/tests/css/css-backgrounds/reference/border-image-repeat-004-ref.html b/tests/wpt/tests/css/css-backgrounds/reference/border-image-repeat-004-ref.html
new file mode 100644
index 00000000000..9c3f7176633
--- /dev/null
+++ b/tests/wpt/tests/css/css-backgrounds/reference/border-image-repeat-004-ref.html
@@ -0,0 +1,54 @@
+<!DOCTYPE html>
+
+  <meta charset="UTF-8">
+
+  <title>CSS Reftest reference</title>
+
+  <link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/">
+
+  <style>
+  table
+    {
+      border-spacing: 0px;
+      margin: 70px;
+      table-layout: fixed;
+    }
+
+  td
+    {
+      height: 40px;
+      padding: 0px;
+    }
+
+  td.corner
+    {
+      background-image: url("../support/new-red-diamond-27x27.png");
+      background-size: cover;
+    }
+
+  td#first-row-second-cell , td#third-row-second-cell , td.second-row
+    {
+      background-image: url("../support/blue-diamond-27x27.png");
+      background-size: 100px 40px;
+    }
+
+  td.second-row
+    {
+      background-size: 40px 100px;
+      height: 100px;
+    }
+  </style>
+
+  <p>Test passes if there is only one (and streched) blue diamond on each side of the border.
+
+  <table>
+
+    <col width="40"><col width="100"><col width="40">
+
+    <tr><td class="corner"><td id="first-row-second-cell"><td class="corner">
+
+    <tr><td class="second-row"><td><td class="second-row">
+
+    <tr><td class="corner"><td id="third-row-second-cell"><td class="corner">
+
+  </table>
diff --git a/tests/wpt/tests/css/css-backgrounds/reference/border-image-slice-004-ref.html b/tests/wpt/tests/css/css-backgrounds/reference/border-image-slice-004-ref.html
new file mode 100644
index 00000000000..d9c798a6167
--- /dev/null
+++ b/tests/wpt/tests/css/css-backgrounds/reference/border-image-slice-004-ref.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+
+  <meta charset="UTF-8">
+
+  <title>CSS Reftest reference</title>
+
+  <link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/">
+
+  <style>
+  div
+    {
+      border: green solid 30px;
+      height: 100px;
+      margin: 50px;
+      width: 100px;
+    }
+  </style>
+
+  <p>Test passes if there is no red color visible on the page.
+
+  <div></div>
diff --git a/tests/wpt/tests/css/css-backgrounds/support/9grid20-40-red.png b/tests/wpt/tests/css/css-backgrounds/support/9grid20-40-red.png
new file mode 100644
index 00000000000..75173b7edc0
Binary files /dev/null and b/tests/wpt/tests/css/css-backgrounds/support/9grid20-40-red.png differ
diff --git a/tests/wpt/tests/css/css-cascade/tons-of-declarations-crash.html b/tests/wpt/tests/css/css-cascade/tons-of-declarations-crash.html
new file mode 100644
index 00000000000..50a32c19389
--- /dev/null
+++ b/tests/wpt/tests/css/css-cascade/tons-of-declarations-crash.html
@@ -0,0 +1,6 @@
+<!doctype html>
+<style></style>
+<script>
+document.querySelector('style').innerText = `input { border: 1px solid }`.repeat(2 << 16);
+</script>
+<input>
diff --git a/tests/wpt/tests/css/css-color/light-dark-basic.html b/tests/wpt/tests/css/css-color/light-dark-basic.html
new file mode 100644
index 00000000000..ee053322384
--- /dev/null
+++ b/tests/wpt/tests/css/css-color/light-dark-basic.html
@@ -0,0 +1,26 @@
+<!doctype html>
+<title>light-dark() color-scheme propagation</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<link rel="help" href="https://drafts.csswg.org/css-color-adjust/#color-scheme-effect">
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/7561">
+<div id="system"></div>
+<div id="light" style="color-scheme: light"></div>
+<div id="dark" style="color-scheme: dark"></div>
+<script>
+const system_is_dark = matchMedia("(prefers-color-scheme: dark)").matches;
+const elements = ["system", "light", "dark"].map(document.getElementById.bind(document));
+function test_light_dark(color, expected_light, expected_dark) {
+  test(() => {
+    for (let element of elements) {
+      let should_be_dark = element.id == "dark" || (element.id == "system" && system_is_dark);
+      element.style.backgroundColor = color;
+      assert_not_equals(element.style.backgroundColor, "", "Should be valid");
+      assert_equals(getComputedStyle(element).backgroundColor, should_be_dark ? expected_dark : expected_light);
+    }
+  }, color);
+}
+
+test_light_dark("light-dark(white, black)", "rgb(255, 255, 255)", "rgb(0, 0, 0)");
+test_light_dark("light-dark(light-dark(white, red), red)", "rgb(255, 255, 255)", "rgb(255, 0, 0)");
+</script>
diff --git a/tests/wpt/tests/css/css-color/light-dark-currentcolor.html b/tests/wpt/tests/css/css-color/light-dark-currentcolor.html
new file mode 100644
index 00000000000..512a492b293
--- /dev/null
+++ b/tests/wpt/tests/css/css-color/light-dark-currentcolor.html
@@ -0,0 +1,16 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>CurrentColor can be used inside light-dark</title>
+<link rel="help" href="https://drafts.csswg.org/css-color-adjust/#color-scheme-effect">
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/7561">
+<link rel="match" href="/css/reference/ref-filled-green-100px-square-only.html">
+<style>
+.square {
+  width: 100px;
+  height: 100px;
+  color: green;
+  background-color: light-dark(currentColor, currentColor);
+}
+</style>
+<p>Test passes if there is a filled green square.</p>
+<div class="square"></div>
diff --git a/tests/wpt/tests/css/css-color/light-dark-inheritance.html b/tests/wpt/tests/css/css-color/light-dark-inheritance.html
new file mode 100644
index 00000000000..1128b57319b
--- /dev/null
+++ b/tests/wpt/tests/css/css-color/light-dark-inheritance.html
@@ -0,0 +1,22 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>light-dark() computes to the actual value, like system colors</title>
+<link rel="help" href="https://drafts.csswg.org/css-color-adjust/#color-scheme-effect">
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/7561">
+<link rel="match" href="/css/reference/ref-filled-green-100px-square-only.html">
+<style>
+.square {
+  width: 100px;
+  height: 100px;
+  color-scheme: dark;
+  background-color: currentColor;
+}
+.container {
+  color-scheme: light;
+  color: light-dark(green, red);
+}
+</style>
+<p>Test passes if there is a filled green square.</p>
+<div class="container">
+  <div class="square"></div>
+</div>
diff --git a/tests/wpt/tests/css/css-flexbox/order/order-abs-children-painting-order-different-container.html b/tests/wpt/tests/css/css-flexbox/order/order-abs-children-painting-order-different-container.html
new file mode 100644
index 00000000000..202581dd1d1
--- /dev/null
+++ b/tests/wpt/tests/css/css-flexbox/order/order-abs-children-painting-order-different-container.html
@@ -0,0 +1,53 @@
+<!DOCTYPE html>
+<title>CSS Test: flex order affects painting order of absolutely positioned boxes inside flex</title>
+<link rel="author" title="Chris Harrelson" href="mailto:chrishtr@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-flexbox/#propdef-order">
+<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1489495">
+<link rel="match" href="../../reference/ref-filled-green-100px-square-only.html">
+<meta name="assert" content="This test check that relative positioned boxes that are grandchildren of two flexboxes don't sort paint order relative to each other.">
+<style>
+  #test {
+    display: flex;
+    height: 100px;
+    width: 100px;
+  }
+
+  #test2 {
+    display: flex;
+    height: 100px;
+    width: 100px;
+  }
+
+  #order-1 {
+    order: 1;
+  }
+
+  #order-2 {
+    order: 2;
+  }
+
+  .inner {
+    position: relative;
+    width: 100px;
+    height: 100px;
+  }
+
+  #order-1 .inner {
+    background-color: green;
+  }
+
+  #order-2 .inner {
+    background-color: red;
+  }
+</style>
+<p>Test passes if there is a filled green square.</p>
+<div id="test">
+  <div id="order-2">
+    <div class="inner"></div>
+  </div>
+</div>
+<div id="test2" style="margin-top: -100px">
+  <div id="order-1">
+    <div class="inner"></div>
+  </div>
+</div>
diff --git a/tests/wpt/tests/css/css-fonts/font-synthesis-08-ref.html b/tests/wpt/tests/css/css-fonts/font-synthesis-08-ref.html
new file mode 100644
index 00000000000..39cd4558d98
--- /dev/null
+++ b/tests/wpt/tests/css/css-fonts/font-synthesis-08-ref.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<html lang="en">
+<meta charset="utf-8"/>
+<title>CSS Test: font-synthesis style and weight</title>
+<style>
+    @font-face {
+        font-family: "lato";
+        src: url(support/fonts/Lato-Medium.ttf);
+    }
+    .test {
+        font-family: "lato";
+        font-size: 3em;
+    }
+    .auto {
+        font-style: italic;
+        font-weight: bold;
+    }
+    .weight {
+        font-weight: bold;
+    }
+    .style {
+        font-style: italic;
+    }
+</style>
+
+<section class="test">
+    <p class="auto">Filler text</p>
+    <p class>Filler text</p>
+    <p class="weight">Filler text</p>
+    <p class="style">Filler text</p>
+</section>
\ No newline at end of file
diff --git a/tests/wpt/tests/css/css-fonts/font-synthesis-08.html b/tests/wpt/tests/css/css-fonts/font-synthesis-08.html
new file mode 100644
index 00000000000..b3de1afcaee
--- /dev/null
+++ b/tests/wpt/tests/css/css-fonts/font-synthesis-08.html
@@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<html lang="en">
+<meta charset="utf-8"/>
+<title>CSS Test: font-synthesis style and weight</title>
+<link rel="match" href="font-synthesis-08-ref.html">
+<link rel="help" href="https://www.w3.org/TR/css-fonts-4/#font-synthesis">
+<meta name="assert" content="If ‘weight’/'style' is not specified for
+    font-synthesis property, user agents must not synthesize bold/italic faces">
+<style>
+    @font-face {
+        font-family: "lato";
+        src: url(support/fonts/Lato-Medium.ttf);
+    }
+    .test {
+        font-family: "lato";
+        font-size: 3em;
+        font-style: italic;
+        font-weight: bold;
+    }
+    .auto {
+        font-synthesis: weight style;
+    }
+    .none {
+        font-synthesis: none;
+    }
+    .weight {
+        font-synthesis: weight;
+    }
+    .style {
+        font-synthesis: style;
+    }
+</style>
+
+<!-- If a previous font-synthesis property and value was encountered by the
+    style engine, make sure that this newer value is correctly updated and not
+    confused with an earlier value due to incorrect caching. Appearance of the
+    4 section needs to differ in weight and style respectively. -->
+<section class="test">
+    <p class="auto">Filler text</p>
+    <p class="none">Filler text</p>
+    <p class="weight">Filler text</p>
+    <p class="style">Filler text</p>
+</section>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/align-tracks/masonry-align-tracks-001-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/align-tracks/masonry-align-tracks-001-ref.html
deleted file mode 100644
index 3b22489fdb9..00000000000
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/align-tracks/masonry-align-tracks-001-ref.html
+++ /dev/null
@@ -1,120 +0,0 @@
-<!DOCTYPE HTML>
-<!--
-     Any copyright is dedicated to the Public Domain.
-     http://creativecommons.org/publicdomain/zero/1.0/
--->
-<html><head>
-  <meta charset="utf-8">
-  <title>Reference: Masonry layout with `align-tracks` alignment</title>
-  <link rel="author" title="Mats Palmgren" href="mailto:mats@mozilla.com">
-  <style>
-html,body {
-  color:black; background-color:white; font:10px/1 monospace; padding:0; margin:0;
-}
-
-.hl { writing-mode: horizontal-tb; direction:ltr; }
-.hr { writing-mode: horizontal-tb; direction:rtl; }
-.vll { writing-mode: vertical-lr; direction:ltr; }
-.vlr { writing-mode: vertical-lr; direction:rtl; }
-.vrl { writing-mode: vertical-rl; direction:ltr; }
-.vrr { writing-mode: vertical-rl; direction:rtl; }
-.swl { writing-mode: sideways-lr; direction:ltr; }
-.swr { writing-mode: sideways-lr; direction:rtl; }
-
-grid {
-  display: inline-grid;
-  gap: 1px 2px;
-  background: content-box silver;
-  color: #444;
-  padding: 1px 2px;
-  block-size: 30px;
-  vertical-align: top;
-}
-grid.vll, grid.vrr, grid.vlr, grid.vrl, grid.swl, grid.swr {
-  inline-size: 22px;
-}
-
-grid > div {
-  display: inline-flex;
-  inline-size: min-content;
-}
-
-grid2 {
-  display: inline-grid;
-  row-gap: 1px;
-  grid-template-columns: 8px;
-  vertical-align: top;
-  block-size: 21px;
-}
-
-item {
-  background-color: #444;
-  color: #fff;
-  writing-mode: horizontal-tb;
-  direction: ltr;
-}
-grid2:nth-child(1) {
-  grid-template-rows: 8px 8px;
-  margin-inline-end: 2px;
-}
-grid2:nth-child(2) {
-  grid-template-rows: 12px 8px;
-}
-
-.vll grid2:nth-child(1) { block-size:17px; }
-.vrr grid2:nth-child(1) { block-size:17px; }
-.vlr grid2:nth-child(1) { block-size:17px; }
-.vrl grid2:nth-child(1) { block-size:17px; }
-.swl grid2:nth-child(1) { block-size:17px; }
-.swr grid2:nth-child(1) { block-size:17px; }
-
-.vll grid2:nth-child(2) { grid-template-rows:8px 8px; }
-.vrr grid2:nth-child(2) { grid-template-rows:8px 8px; }
-.vlr grid2:nth-child(2) { grid-template-rows:8px 8px; }
-.vrl grid2:nth-child(2) { grid-template-rows:8px 8px; }
-.swl grid2:nth-child(2) { grid-template-rows:8px 8px; }
-.swr grid2:nth-child(2) { grid-template-rows:8px 8px; }
-
-grid2:nth-child(1) > item:nth-child(1) { background: blue; inline-size:8px; block-size:8px; z-index:1; }
-grid2:nth-child(2) > item:nth-child(1) { background: magenta; inline-size:8px; block-size:12px; z-index:1; }
-grid2:nth-child(1) > item:nth-child(2) { background: lime; inline-size:12px; block-size:8px; z-index:2; }
-grid2:nth-child(2) > item:nth-child(2) { background: purple; inline-size:8px; block-size:8px; z-index:2; }
-</style>
-</head>
-<body>
-<div style="display:none">
-<grid>
- <div>
-  <grid2>
-    <item></item>
-    <item></item>
-  </grid2><grid2>
-    <item></item>
-    <item></item>
-  </grid2>
- </div>
-</grid>
-</div>
-
-<script>
-let wms = [ "hl", "hr", "vll", "vrr", "vlr", "vrl", "swl", "swr", ];
-let ats = [ "start", "self-start", "center", "end", "self-end", "stretch", "space-between", "space-around", "space-evenly", ];
-let acs = [ "start", "center", "end", ];
-let grid = document.getElementsByTagName('grid')[0];
-for (const ac of acs) {
-  for (const at of ats) {
-    for (const wm of wms) {
-      let e = grid.cloneNode(true);
-      e.className = wm;
-      e.children[0].children[1].style.className = wm;
-      e.children[0].children[0].style.alignContent = at;
-      e.children[0].children[1].style.alignContent = at;
-      e.style.alignContent = ac;
-      document.body.appendChild(e);
-    }
-  }
-}
-</script>
-
-</body>
-</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/align-tracks/masonry-align-tracks-001.html b/tests/wpt/tests/css/css-grid/masonry/tentative/align-tracks/masonry-align-tracks-001.html
deleted file mode 100644
index 4ff3e610875..00000000000
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/align-tracks/masonry-align-tracks-001.html
+++ /dev/null
@@ -1,80 +0,0 @@
-<!DOCTYPE HTML>
-<!--
-     Any copyright is dedicated to the Public Domain.
-     http://creativecommons.org/publicdomain/zero/1.0/
--->
-<html><head>
-  <meta charset="utf-8">
-  <title>CSS Grid Test: Masonry layout with `align-tracks` alignment</title>
-  <link rel="author" title="Mats Palmgren" href="mailto:mats@mozilla.com">
-  <link rel="help" href="https://drafts.csswg.org/css-grid-2">
-  <link rel="match" href="masonry-align-tracks-001-ref.html">
-  <style>
-html,body {
-  color:black; background-color:white; font:10px/1 monospace; padding:0; margin:0;
-}
-
-.hl { writing-mode: horizontal-tb; direction:ltr; }
-.hr { writing-mode: horizontal-tb; direction:rtl; }
-.vll { writing-mode: vertical-lr; direction:ltr; }
-.vlr { writing-mode: vertical-lr; direction:rtl; }
-.vrl { writing-mode: vertical-rl; direction:ltr; }
-.vrr { writing-mode: vertical-rl; direction:rtl; }
-.swl { writing-mode: sideways-lr; direction:ltr; }
-.swr { writing-mode: sideways-lr; direction:rtl; }
-
-grid {
-  display: inline-grid;
-  gap: 1px 2px;
-  grid-template-columns: repeat(2,auto);
-  grid-template-rows: masonry;
-  background: content-box silver;
-  color: #444;
-  padding: 1px 2px;
-  block-size: 30px;
-  vertical-align: top;
-}
-
-item {
-  background-color: #444;
-  color: #fff;
-  writing-mode: horizontal-tb;
-  direction: ltr;
-}
-
-item:nth-child(1) { background: blue; inline-size:8px; block-size:8px; }
-item:nth-child(2) { background: magenta; inline-size:8px; block-size:12px; }
-item:nth-child(3) { background: lime; inline-size:12px; block-size:8px; }
-item:nth-child(4) { background: purple; inline-size:8px; block-size:8px; }
-</style>
-</head>
-<body>
-<div style="display:none">
-<grid>
-  <item></item>
-  <item></item>
-  <item></item>
-  <item></item>
-</grid>
-</div>
-
-<script>
-let wms = [ "hl", "hr", "vll", "vrr", "vlr", "vrl", "swl", "swr", ];
-let ats = [ "start", "self-start", "center", "end", "self-end", "stretch", "space-between", "space-around", "space-evenly", ];
-let acs = [ "start", "center", "end", ];
-let grid = document.getElementsByTagName('grid')[0];
-for (const ac of acs) {
-  for (const at of ats) {
-    for (const wm of wms) {
-      let e = grid.cloneNode(true);
-      e.className = wm;
-      e.style.alignTracks = at;
-      e.style.alignContent = ac;
-      document.body.appendChild(e);
-    }
-  }
-}
-</script>
-
-</body>
-</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/align-tracks/masonry-align-tracks-multi-001-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/align-tracks/masonry-align-tracks-multi-001-ref.html
deleted file mode 100644
index b0bf3578618..00000000000
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/align-tracks/masonry-align-tracks-multi-001-ref.html
+++ /dev/null
@@ -1,116 +0,0 @@
-<!DOCTYPE HTML>
-<!--
-     Any copyright is dedicated to the Public Domain.
-     http://creativecommons.org/publicdomain/zero/1.0/
--->
-<html><head>
-  <meta charset="utf-8">
-  <title>Reference: Masonry layout with multiple `align-tracks` values</title>
-  <link rel="author" title="Mats Palmgren" href="mailto:mats@mozilla.com">
-<style>
-html,body {
-  color:black; background-color:white; font:15px/1 "Courier New", monospace; padding:0; margin:0;
-}
-grid {
-  display: inline-grid;
-  grid-template-rows: auto;
-  grid-template-columns: repeat(8,50px); /*intentionally one more than align-tracks values*/
-  gap: 3px 5px;
-  padding: 10px 3px 1px 7px;
-  border: solid;
-  border-width: 1px 7px 3px 5px;
-  background: lightgrey content-box;
-  height: 500px;
-  vertical-align: top;
-}
-.fallback { grid-template-columns:3px; padding:0; border:0; }
-item {
-  background: grey;
-  height: 2em;
-  position: relative;
-  border: 1px solid;
-}
-.purple { background:purple; height:auto; border-top:3px solid; }
-z { display: block; background: yellow; height: 0; width:80%; }
-a {
- position: absolute;
- inset: 0;
- top: auto;
- border: 2px solid lime;
-}
-masonry-track {
-  display: grid;
-  gap: 3px 5px;
-}
-masonry-track:nth-child(1) { align-content:start }
-masonry-track:nth-child(2) { align-content:end }
-masonry-track:nth-child(3) { align-content:center }
-masonry-track:nth-child(4) { align-content:stretch; grid-template-rows: auto auto repeat(3,max-content) }
-masonry-track:nth-child(5) { align-content:space-between }
-masonry-track:nth-child(6) { align-content:space-around }
-masonry-track:nth-child(7) { align-content:space-evenly }
-masonry-track:nth-child(8) { align-content:space-evenly }
-</style>
-</head>
-<body>
-<grid>
- <masonry-track>
-  <item style="width:25px">1</item>
-  <item>11</item>
-  <item class="purple">20</item>
-  <item class="purple">24</item>
-  <item>29</item>
- </masonry-track>
- <masonry-track>
-  <item class="purple" style="height:50px">2</item>
-  <item class="purple" style="writing-mode:vertical-rl">16 vertical-rl</item>
- </masonry-track>
- <masonry-track>
-  <item style="margin-left:5px">3</item>
-  <item class="purple">12<z></z></item>
-  <item>17</item>
-  <item>25</item>
-  <item>33</item>
- </masonry-track>
- <masonry-track>
-  <item class="purple" style="margin-top:5px">4</item>
-  <item class="purple">10</item>
-  <item>15</item>
-  <item>23</item>
-  <item>31</item>
- </masonry-track>
- <masonry-track>
-  <item>5</item>
-  <item>13</item>
-  <item>21</item>
-  <item class="purple">28</item>
- </masonry-track>
- <masonry-track>
-  <item class="purple">6<a></a></item>
-  <item>9<a></a></item>
-  <item class="purple">18</item>
-  <item class="purple">22</item>
-  <item>27</item>
- </masonry-track>
- <masonry-track>
-  <item>7</item>
-  <item class="purple">14<z></z><a></a></item>
-  <item>19</item>
-  <item class="purple">26</item>
-  <item class="purple">30</item>
- </masonry-track>
- <masonry-track>
-  <item class="purple" style="writing-mode:vertical-lr">8 vertical-lr</item>
-  <item class="purple">32</item>
- </masonry-track>
-</grid>
-<grid class="fallback" style="align-content:start">
-  <item></item>
-</grid>
-<grid class="fallback" style="align-content:center">
-  <item></item>
-</grid>
-<grid class="fallback" style="align-content:center">
-  <item></item>
-</grid>
-</body></html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/align-tracks/masonry-align-tracks-multi-001.html b/tests/wpt/tests/css/css-grid/masonry/tentative/align-tracks/masonry-align-tracks-multi-001.html
deleted file mode 100644
index 0e20217da80..00000000000
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/align-tracks/masonry-align-tracks-multi-001.html
+++ /dev/null
@@ -1,91 +0,0 @@
-<!DOCTYPE HTML>
-<!--
-     Any copyright is dedicated to the Public Domain.
-     http://creativecommons.org/publicdomain/zero/1.0/
--->
-<html><head>
-  <meta charset="utf-8">
-  <title>CSS Grid Test: Masonry layout with multiple `align-tracks` values</title>
-  <link rel="author" title="Mats Palmgren" href="mailto:mats@mozilla.com">
-  <link rel="help" href="https://drafts.csswg.org/css-grid-2">
-  <link rel="match" href="masonry-align-tracks-multi-001-ref.html">
-<style>
-html,body {
-  color:black; background-color:white; font:15px/1 "Courier New", monospace; padding:0; margin:0;
-}
-grid {
-  display: inline-grid;
-  grid-template-rows: masonry;
-  grid-template-columns: repeat(8,50px); /*intentionally one more than align-tracks values*/
-  gap: 3px 5px;
-  padding: 10px 3px 1px 7px;
-  border: solid;
-  border-width: 1px 7px 3px 5px;
-  background: lightgrey content-box;
-  align-tracks: start,end,center,stretch,space-between,space-around,space-evenly;
-  height: 500px;
-  vertical-align: top;
-}
-.fallback { grid-template-columns:3px; padding:0; border:0; }
-item {
-  background: grey;
-  height: 2em;
-  position: relative;
-  border: 1px solid;
-}
-item:nth-child(2n) { background:purple; height:auto; border-top:3px solid; }
-z { display: block; background: yellow; height: 20%; width:80%; }
-a {
- position: absolute;
- inset: 0;
- top: auto;
- border: 2px solid lime;
-}
-</style>
-</head>
-<body>
-<grid>
-  <item style="width:50%">1</item>
-  <item style="height:10%">2</item>
-  <item style="margin-left:10%">3</item>
-  <item style="margin-top:10%">4</item>
-  <item>5</item>
-  <item>6<a></a></item>
-  <item>7</item>
-  <item style="writing-mode:vertical-lr">8 vertical-lr</item>
-  <item>9<a></a></item>
-  <item>10</item>
-  <item>11</item>
-  <item>12<z></z></item>
-  <item>13</item>
-  <item><z></z>14<a></a></item>
-  <item>15</item>
-  <item style="writing-mode:vertical-rl">16 vertical-rl</item>
-  <item>17</item>
-  <item>18</item>
-  <item>19</item>
-  <item>20</item>
-  <item>21</item>
-  <item>22</item>
-  <item>23</item>
-  <item>24</item>
-  <item>25</item>
-  <item>26</item>
-  <item>27</item>
-  <item>28</item>
-  <item>29</item>
-  <item>30</item>
-  <item>31</item>
-  <item>32</item>
-  <item>33</item>
-</grid>
-<grid class="fallback" style="align-tracks:space-between">
-  <item></item>
-</grid>
-<grid class="fallback" style="align-tracks:space-around">
-  <item></item>
-</grid>
-<grid class="fallback" style="align-tracks:space-evenly">
-  <item></item>
-</grid>
-</body></html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/align-tracks/masonry-align-tracks-stretch-001-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/align-tracks/masonry-align-tracks-stretch-001-ref.html
deleted file mode 100644
index 0712f14bb31..00000000000
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diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/align-tracks/masonry-align-tracks-stretch-001.html b/tests/wpt/tests/css/css-grid/masonry/tentative/align-tracks/masonry-align-tracks-stretch-001.html
deleted file mode 100644
index d2fede7a8ed..00000000000
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/align-tracks/masonry-align-tracks-stretch-001.html
+++ /dev/null
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-     http://creativecommons.org/publicdomain/zero/1.0/
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-  <title>CSS Grid Test: Masonry layout with `align-tracks:stretch`</title>
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-  <link rel="help" href="https://drafts.csswg.org/css-grid-2">
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diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/align-tracks/masonry-align-tracks-stretch-002-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/align-tracks/masonry-align-tracks-stretch-002-ref.html
deleted file mode 100644
index 01f24ea986f..00000000000
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/align-tracks/masonry-align-tracks-stretch-002-ref.html
+++ /dev/null
@@ -1,68 +0,0 @@
-<!DOCTYPE HTML>
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-     http://creativecommons.org/publicdomain/zero/1.0/
--->
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-  <title>Reference: Masonry layout with `align-tracks:stretch`</title>
-  <link rel="author" title="Mats Palmgren" href="mailto:mats@mozilla.com">
-<style>
-html,body {
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diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/align-tracks/masonry-align-tracks-stretch-002.html b/tests/wpt/tests/css/css-grid/masonry/tentative/align-tracks/masonry-align-tracks-stretch-002.html
deleted file mode 100644
index 1631ac3c07d..00000000000
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/align-tracks/masonry-align-tracks-stretch-002.html
+++ /dev/null
@@ -1,71 +0,0 @@
-<!DOCTYPE HTML>
-<!--
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-     http://creativecommons.org/publicdomain/zero/1.0/
--->
-<html><head>
-  <meta charset="utf-8">
-  <title>CSS Grid Test: Masonry layout with `align-tracks:stretch`</title>
-  <link rel="author" title="Mats Palmgren" href="mailto:mats@mozilla.com">
-  <link rel="help" href="https://drafts.csswg.org/css-grid-2">
-  <link rel="match" href="masonry-align-tracks-stretch-002-ref.html">
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diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/justify-tracks/masonry-justify-tracks-001-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/justify-tracks/masonry-justify-tracks-001-ref.html
deleted file mode 100644
index 912c9c9f823..00000000000
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/justify-tracks/masonry-justify-tracks-001-ref.html
+++ /dev/null
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-<!DOCTYPE HTML>
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-     http://creativecommons.org/publicdomain/zero/1.0/
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-  <style>
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diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/justify-tracks/masonry-justify-tracks-001.html b/tests/wpt/tests/css/css-grid/masonry/tentative/justify-tracks/masonry-justify-tracks-001.html
deleted file mode 100644
index bfd3c1ca587..00000000000
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/justify-tracks/masonry-justify-tracks-001.html
+++ /dev/null
@@ -1,81 +0,0 @@
-<!DOCTYPE HTML>
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-     http://creativecommons.org/publicdomain/zero/1.0/
--->
-<html><head>
-  <meta charset="utf-8">
-  <title>CSS Grid Test: Masonry layout with `justify-tracks` alignment</title>
-  <link rel="author" title="Mats Palmgren" href="mailto:mats@mozilla.com">
-  <link rel="help" href="https://drafts.csswg.org/css-grid-2">
-  <link rel="match" href="masonry-justify-tracks-001-ref.html">
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diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/justify-tracks/masonry-justify-tracks-multi-001-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/justify-tracks/masonry-justify-tracks-multi-001-ref.html
deleted file mode 100644
index 319ef217ea7..00000000000
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/justify-tracks/masonry-justify-tracks-multi-001-ref.html
+++ /dev/null
@@ -1,117 +0,0 @@
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-     http://creativecommons.org/publicdomain/zero/1.0/
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-  <title>Reference: Masonry layout with multiple `justify-tracks` values</title>
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-  gap: 3px 5px;
-}
-masonry-track:nth-child(1) { justify-content:start }
-masonry-track:nth-child(2) { justify-content:end }
-masonry-track:nth-child(3) { justify-content:center }
-masonry-track:nth-child(4) { justify-content:stretch; grid-template-columns: repeat(3,auto) repeat(2,max-content); }
-masonry-track:nth-child(5) { justify-content:space-between }
-masonry-track:nth-child(6) { justify-content:space-around }
-masonry-track:nth-child(7) { justify-content:space-evenly }
-masonry-track:nth-child(8) { justify-content:space-evenly }
-</style>
-</head>
-<body>
-<grid>
- <masonry-track>
-  <item style="width:50px">1</item>
-  <item class="purple">20</item>
-  <item class="purple">26</item>
-  <item>33</item>
- </masonry-track>
- <masonry-track>
-  <item class="purple" style="height:25px">2</item>
-  <item>9<a></a></item>
-  <item class="purple">18</item>
-  <item>25</item>
- </masonry-track>
- <masonry-track>
-  <item style="margin-left:10px">3</item>
-  <item>15</item>
-  <item class="purple">24</item>
-  <item class="purple">32</item>
- </masonry-track>
- <masonry-track>
-  <item class="purple" style="margin-top:5px">4</item>
-  <item class="purple">10</item>
-  <item class="purple" style="writing-mode:vertical-rl">16</item>
-  <item>23</item>
-  <item>31</item>
- </masonry-track>
- <masonry-track>
-  <item>5</item>
-  <item>13</item>
-  <item class="purple">22</item>
-  <item>29</item>
- </masonry-track>
- <masonry-track>
-  <item class="purple">6<a></a></item>
-  <item>11</item>
-  <item>19</item>
-  <item class="purple">28</item>
- </masonry-track>
- <masonry-track>
-  <item>7</item>
-  <item class="purple"><z></z>14<a></a></item>
-  <item>21</item>
-  <item class="purple">30</item>
- </masonry-track>
- <masonry-track>
-  <item class="purple" style="writing-mode:vertical-lr">8</item>
-  <item class="purple">12<z></z></item>
-  <item>17</item>
-  <item>27</item>
- </masonry-track>
-</grid>
-<grid class="fallback" style="justify-content:start">
-  <item></item>
-</grid>
-<grid class="fallback" style="justify-content:center">
-  <item></item>
-</grid>
-<grid class="fallback" style="justify-content:center">
-  <item></item>
-</grid>
-</body></html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/justify-tracks/masonry-justify-tracks-multi-001.html b/tests/wpt/tests/css/css-grid/masonry/tentative/justify-tracks/masonry-justify-tracks-multi-001.html
deleted file mode 100644
index 011c487cb72..00000000000
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/justify-tracks/masonry-justify-tracks-multi-001.html
+++ /dev/null
@@ -1,91 +0,0 @@
-<!DOCTYPE HTML>
-<!--
-     Any copyright is dedicated to the Public Domain.
-     http://creativecommons.org/publicdomain/zero/1.0/
--->
-<html><head>
-  <meta charset="utf-8">
-  <title>CSS Grid Test: Masonry layout with multiple `justify-tracks` values</title>
-  <link rel="author" title="Mats Palmgren" href="mailto:mats@mozilla.com">
-  <link rel="help" href="https://drafts.csswg.org/css-grid-2">
-  <link rel="match" href="masonry-justify-tracks-multi-001-ref.html">
-<style>
-html,body {
-  color:black; background-color:white; font:15px/1 "Courier New", monospace; padding:0; margin:0;
-}
-grid {
-  display: inline-grid;
-  grid-template-columns: masonry;
-  grid-template-rows: repeat(8,50px); /*intentionally one more than justify-tracks values*/
-  gap: 3px 5px;
-  padding: 10px 3px 1px 7px;
-  border: solid;
-  border-width: 1px 7px 3px 5px;
-  background: lightgrey content-box;
-  justify-tracks: start,end,center,stretch,space-between,space-around,space-evenly;
-  width: 500px;
-  vertical-justify: top;
-}
-.fallback { grid-template-rows:3px; padding:0; border:0; display: grid; }
-item {
-  background: grey;
-  width: 3ch;
-  position: relative;
-  border: 1px solid;
-}
-item:nth-child(2n) { background:purple; width:auto; border-left:3px solid; }
-z { display: block; background: yellow; height: 20%; width:80%; }
-a {
- position: absolute;
- inset: 0;
- top: auto;
- border: 2px solid lime;
-}
-</style>
-</head>
-<body>
-<grid>
-  <item style="width:10%">1</item>
-  <item style="height:50%">2</item>
-  <item style="margin-left:2%">3</item>
-  <item style="margin-top:1%">4</item>
-  <item>5</item>
-  <item>6<a></a></item>
-  <item>7</item>
-  <item style="writing-mode:vertical-lr">8</item>
-  <item>9<a></a></item>
-  <item>10</item>
-  <item>11</item>
-  <item>12<z></z></item>
-  <item>13</item>
-  <item><z></z>14<a></a></item>
-  <item>15</item>
-  <item style="writing-mode:vertical-rl">16</item>
-  <item>17</item>
-  <item>18</item>
-  <item>19</item>
-  <item>20</item>
-  <item>21</item>
-  <item>22</item>
-  <item>23</item>
-  <item>24</item>
-  <item>25</item>
-  <item>26</item>
-  <item>27</item>
-  <item>28</item>
-  <item>29</item>
-  <item>30</item>
-  <item>31</item>
-  <item>32</item>
-  <item>33</item>
-</grid>
-<grid class="fallback" style="justify-tracks:space-between">
-  <item></item>
-</grid>
-<grid class="fallback" style="justify-tracks:space-around">
-  <item></item>
-</grid>
-<grid class="fallback" style="justify-tracks:space-evenly">
-  <item></item>
-</grid>
-</body></html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/justify-tracks/masonry-justify-tracks-stretch-001-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/justify-tracks/masonry-justify-tracks-stretch-001-ref.html
deleted file mode 100644
index 39053051cc8..00000000000
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/justify-tracks/masonry-justify-tracks-stretch-001-ref.html
+++ /dev/null
@@ -1,86 +0,0 @@
-<!DOCTYPE HTML>
-<!--
-     Any copyright is dedicated to the Public Domain.
-     http://creativecommons.org/publicdomain/zero/1.0/
--->
-<html><head>
-  <meta charset="utf-8">
-  <title>Reference: Masonry layout with `justify-tracks:stretch`</title>
-  <link rel="author" title="Mats Palmgren" href="mailto:mats@mozilla.com">
-  <link rel="stylesheet" type="text/css" href="/fonts/ahem.css">
-<style>
-html,body {
-  color:black; background-color:white; font:16px/1 Ahem; padding:0; margin:0;
-}
-grid {
-  display: inline-grid;
-  grid-template-rows: 150px 100px 50px;
-  grid-template-columns: 500px;
-  gap: 5px 3px;
-  padding: 10px;
-  border: 3px solid;
-  background: lightgrey content-box;
-  width: 500px;
-}
-masonry-track {
-  display: grid;
-  gap: 5px 3px;
-  width: 500px;
-}
-masonry-track:nth-child(1) {
-  grid-template-rows: 150px;
-  grid-template-columns: max-content auto auto min-content min-content auto;
-}
-masonry-track:nth-child(2) {
-  grid-template-rows: 100px;
-  grid-template-columns: auto 50px 3ch 3ch 3ch  min-content min-content;
-}
-masonry-track:nth-child(3) {
-  grid-template-rows: 50px;
-  grid-template-columns: 3ch auto 3ch 3ch auto 3ch auto;
-}
-item {
-  background: grey;
-  width: 3ch;
-  position: relative;
-}
-.purple { background:purple; width:auto; }
-z { display: block; background: yellow; width: 20%; height:10%; }
-a {
- position: absolute;
- inset: 0;
- left: auto;
- border: 2px solid lime;
-}
-</style>
-</head>
-<body>
-<grid>
- <masonry-track>
-  <item style="border:10px solid; margin:10px 0 5px 3px;">1</item>
-  <item style="writing-mode:vertical-lr" class="purple">8<br>vertical</item>
-  <item class="purple">10</item>
-  <item class="purple" style="width:86px; border:solid; border-width:0 2px; margin-right:1px">12<z></z></item>
-  <item>15</item>
-  <item style="margin:0 auto" class="purple">18</item>
- </masonry-track>
- <masonry-track>
-  <item class="purple">2</item>
-  <item style="width:40px; margin-right:10px" class="purple">4</item>
-  <item>5</item>
-  <item>9<a></a></item>
-  <item>13</item>
-  <item style="justify-self:start" class="purple">16</item>
-  <item>19</item>
- </masonry-track>
- <masonry-track>
-  <item>3</item>
-  <item class="purple">6<a></a></item>
-  <item>7</item>
-  <item>11</item>
-  <item class="purple">14<z></z><a></a></item>
-  <item>17</item>
-  <item style="margin-left: auto" class="purple">20</item>
- </masonry-track>
-</grid>
-</body></html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/justify-tracks/masonry-justify-tracks-stretch-001.html b/tests/wpt/tests/css/css-grid/masonry/tentative/justify-tracks/masonry-justify-tracks-stretch-001.html
deleted file mode 100644
index 17cb3218218..00000000000
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/justify-tracks/masonry-justify-tracks-stretch-001.html
+++ /dev/null
@@ -1,67 +0,0 @@
-<!DOCTYPE HTML>
-<!--
-     Any copyright is dedicated to the Public Domain.
-     http://creativecommons.org/publicdomain/zero/1.0/
--->
-<html><head>
-  <meta charset="utf-8">
-  <title>CSS Grid Test: Masonry layout with `justify-tracks:stretch`</title>
-  <link rel="author" title="Mats Palmgren" href="mailto:mats@mozilla.com">
-  <link rel="help" href="https://drafts.csswg.org/css-grid-2">
-  <link rel="match" href="masonry-justify-tracks-stretch-001-ref.html">
-  <link rel="stylesheet" type="text/css" href="/fonts/ahem.css">
-<style>
-html,body {
-  color:black; background-color:white; font:16px/1 Ahem; padding:0; margin:0;
-}
-grid {
-  display: inline-grid;
-  grid-template-rows: 150px 100px 50px;
-  grid-template-columns: masonry;
-  justify-tracks: stretch;
-  gap: 5px 3px;
-  padding: 10px;
-  border: 3px solid;
-  background: lightgrey content-box;
-  width: 500px;
-}
-item {
-  background: grey;
-  width: 3ch;
-  position: relative;
-}
-item:nth-child(2n) { background:purple; width:auto; }
-item:nth-child(1) { border:10px solid; margin: 10px 0 5px 3px; }
-z { display: block; background: yellow; width: 20%; height:10%; }
-a {
- position: absolute;
- inset: 0;
- left: auto;
- border: 2px solid lime;
-}
-</style>
-</head>
-<body>
-<grid>
-  <item>1</item>
-  <item>2</item>
-  <item>3</item>
-  <item style="max-width:40px; margin-right:10px">4</item>
-  <item>5</item>
-  <item>6<a></a></item>
-  <item>7</item>
-  <item style="writing-mode:vertical-lr">8 vertical</item>
-  <item>9<a></a></item>
-  <item>10</item>
-  <item>11</item>
-  <item style="max-width:90px; border:solid; border-width:0 2px; box-sizing:border-box; margin-right:1px">12<z></z></item>
-  <item>13</item>
-  <item>14<z></z><a></a></item>
-  <item>15</item>
-  <item style="justify-self:start">16</item>
-  <item>17</item>
-  <item style="margin:0 auto">18</item>
-  <item>19</item>
-  <item style="margin-left: auto">20</item>
-</grid>
-</body></html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/justify-tracks/masonry-justify-tracks-stretch-002-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/justify-tracks/masonry-justify-tracks-stretch-002-ref.html
deleted file mode 100644
index 69759484f29..00000000000
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/justify-tracks/masonry-justify-tracks-stretch-002-ref.html
+++ /dev/null
@@ -1,68 +0,0 @@
-<!DOCTYPE HTML>
-<!--
-     Any copyright is dedicated to the Public Domain.
-     http://creativecommons.org/publicdomain/zero/1.0/
--->
-<html><head>
-  <meta charset="utf-8">
-  <title>Reference: Masonry layout with `justify-tracks:stretch`</title>
-  <link rel="author" title="Mats Palmgren" href="mailto:mats@mozilla.com">
-<style>
-html,body {
-  color:black; background-color:white; font:6px/1 monospace; padding:0; margin:0;
-}
-grid {
-  display: inline-grid;
-  grid-template-columns: auto auto;
-  grid-template-rows: 30px;
-  gap: 1px 2px;
-  padding: 2px 3px 1px 1px;
-  border-style: solid;
-  border-width: 1px 7px 3px 5px;
-  border-inline-start-color: magenta;
-  border-block-start-color: blue;
-  background: lightgrey content-box;
-  inline-size: 25px;
-  vertical-align: top;
-}
-item {
-  border-inline-start: 1px solid magenta;
-  border-block-start: 2px solid blue;
-}
-item:nth-child(2n+1) { background: grey; }
-item:nth-child(2n) { background: cyan; }
-.hl { writing-mode: horizontal-tb; direction:ltr; }
-.hr { writing-mode: horizontal-tb; direction:rtl; }
-.vll { writing-mode: vertical-lr; direction:ltr; }
-.vlr { writing-mode: vertical-lr; direction:rtl; }
-.vrl { writing-mode: vertical-rl; direction:ltr; }
-.vrr { writing-mode: vertical-rl; direction:rtl; }
-.swl { writing-mode: sideways-lr; direction:ltr; }
-.swr { writing-mode: sideways-lr; direction:rtl; }
-</style>
-</head>
-<body>
-<div style="display:none">
-<grid>
-  <item>1</item>
-  <item>2a<br>2b</item>
-</grid>
-</div>
-<script>
-let wms = [ "hl", "hr", "vll", "vrr", "vlr", "vrl", "swl", "swr", ];
-let grid = document.getElementsByTagName('grid')[0];
-for (const reorder of [false, true]) {
-  for (const cb_wm of wms) {
-    for (const child_wm of wms) {
-      let e = grid.cloneNode(true);
-      e.className = cb_wm;
-      e.children[1].className = child_wm;
-      if (reorder) {
-        e.children[0].style.order = '1';
-      }
-      document.body.appendChild(e);
-    }
-  }
-}
-</script>
-</body></html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/justify-tracks/masonry-justify-tracks-stretch-002.html b/tests/wpt/tests/css/css-grid/masonry/tentative/justify-tracks/masonry-justify-tracks-stretch-002.html
deleted file mode 100644
index 6b7746722dc..00000000000
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/justify-tracks/masonry-justify-tracks-stretch-002.html
+++ /dev/null
@@ -1,72 +0,0 @@
-<!DOCTYPE HTML>
-<!--
-     Any copyright is dedicated to the Public Domain.
-     http://creativecommons.org/publicdomain/zero/1.0/
--->
-<html><head>
-  <meta charset="utf-8">
-  <title>CSS Grid Test: Masonry layout with `justify-tracks:stretch`</title>
-  <link rel="author" title="Mats Palmgren" href="mailto:mats@mozilla.com">
-  <link rel="help" href="https://drafts.csswg.org/css-grid-2">
-  <link rel="match" href="masonry-justify-tracks-stretch-002-ref.html">
-<style>
-html,body {
-  color:black; background-color:white; font:6px/1 monospace; padding:0; margin:0;
-}
-grid {
-  display: inline-grid;
-  grid-template-columns: masonry;
-  grid-template-rows: 30px;
-  gap: 1px 2px;
-  padding: 2px 3px 1px 1px;
-  border-style: solid;
-  border-width: 1px 7px 3px 5px;
-  border-inline-start-color: magenta;
-  border-block-start-color: blue;
-  background: lightgrey content-box;
-  justify-tracks: stretch;
-  inline-size: 25px;
-  vertical-align: top;
-}
-item {
-  position: relative;
-  border-inline-start: 1px solid magenta;
-  border-block-start: 2px solid blue;
-}
-item:nth-child(2n+1) { background: grey; }
-item:nth-child(2n) { background: cyan; }
-.hl { writing-mode: horizontal-tb; direction:ltr; }
-.hr { writing-mode: horizontal-tb; direction:rtl; }
-.vll { writing-mode: vertical-lr; direction:ltr; }
-.vlr { writing-mode: vertical-lr; direction:rtl; }
-.vrl { writing-mode: vertical-rl; direction:ltr; }
-.vrr { writing-mode: vertical-rl; direction:rtl; }
-.swl { writing-mode: sideways-lr; direction:ltr; }
-.swr { writing-mode: sideways-lr; direction:rtl; }
-</style>
-</head>
-<body>
-<div style="display:none">
-<grid>
-  <item>1</item>
-  <item>2a<br>2b</item>
-</grid>
-</div>
-<script>
-let wms = [ "hl", "hr", "vll", "vrr", "vlr", "vrl", "swl", "swr", ];
-let grid = document.getElementsByTagName('grid')[0];
-for (const reorder of [false, true]) {
-  for (const cb_wm of wms) {
-    for (const child_wm of wms) {
-      let e = grid.cloneNode(true);
-      e.className = cb_wm;
-      e.children[1].className = child_wm;
-      if (reorder) {
-        e.children[0].style.order = '1';
-      }
-      document.body.appendChild(e);
-    }
-  }
-}
-</script>
-</body></html>
diff --git a/tests/wpt/tests/css/css-grid/subgrid/align-self-baseline-with-subgrid-mbp.html b/tests/wpt/tests/css/css-grid/subgrid/align-self-baseline-with-subgrid-mbp.html
new file mode 100644
index 00000000000..bb9f8444835
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/subgrid/align-self-baseline-with-subgrid-mbp.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<html>
+<head>
+<link rel="author" title="Sammy Gill" href="mailto:sammy.gill@apple.com">
+<meta name="assert" content="Margin, border, and padding of subgrids should influence the offset of items in the same baseline alignment context">
+<link rel="help" href="https://drafts.csswg.org/css-grid-2/#subgrid-item-contribution">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+<style>
+html,body {
+  color:black; background-color:white;  padding:0; margin:0;
+}
+.grid {
+    font:16px/1 Ahem;
+    display: inline-grid;
+    border: 1px solid black;
+    grid-template-columns: auto auto;
+}
+.subgrid {
+    display: grid;
+    grid-template-rows: subgrid;
+    border: 9px solid blue;
+    margin-top: 15px;
+    padding-top: 6px;
+}
+.first-baseline {
+    align-self: baseline;
+}
+</style>
+</head>
+<body onload="checkLayout('.first-baseline')">
+<div id="target" class="grid">
+    <div data-offset-y="31" class="first-baseline">X</div>
+    <div class="subgrid">
+        <div data-offset-y="31"  class="first-baseline">X</div>
+    </div>
+</div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-masking/clip-path/clip-path-foreignobject-non-zero-xy.html b/tests/wpt/tests/css/css-masking/clip-path/clip-path-foreignobject-non-zero-xy.html
new file mode 100644
index 00000000000..a63f4c8aa29
--- /dev/null
+++ b/tests/wpt/tests/css/css-masking/clip-path/clip-path-foreignobject-non-zero-xy.html
@@ -0,0 +1,14 @@
+<!doctype html>
+<title>CSS Masking: clip-path on a foreignObject with non-zero 'x' and 'y' render correctly</title>
+<link rel="help" href="https://drafts.fxtf.org/css-masking-1/#the-clip-path">
+<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1218383">
+<link rel="match" href="reference/green-100x100.html">
+<svg viewBox="25 50 200 100" width="200">
+  <rect x="25" y="50" width="100" height="100" fill="red"/>
+  <clipPath id="r">
+    <rect x="25" y="50" width="100" height="100"/>
+  </clipPath>
+  <foreignObject x="25" y="50" width="150" height="100" clip-path="url(#r)">
+    <div style="width: 100px; height: 100px; background-color: green; border-right: 50px solid red"></div>
+  </foreignObject>
+</svg>
diff --git a/tests/wpt/tests/css/css-masking/clip-path/clip-path-shape-foreignobject-non-zero-xy.html b/tests/wpt/tests/css/css-masking/clip-path/clip-path-shape-foreignobject-non-zero-xy.html
new file mode 100644
index 00000000000..4e221f36e4c
--- /dev/null
+++ b/tests/wpt/tests/css/css-masking/clip-path/clip-path-shape-foreignobject-non-zero-xy.html
@@ -0,0 +1,11 @@
+<!doctype html>
+<title>CSS Masking: clip-path on a foreignObject with non-zero 'x' and 'y' render correctly</title>
+<link rel="help" href="https://drafts.fxtf.org/css-masking-1/#the-clip-path">
+<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1218383">
+<link rel="match" href="reference/green-100x100.html">
+<svg viewBox="25 50 200 100" width="200">
+  <rect x="25" y="50" width="100" height="100" fill="red"/>
+  <foreignObject x="25" y="50" width="150" height="100" clip-path="inset(0 50 0 0)">
+    <div style="width: 100px; height: 100px; background-color: green; border-right: 50px solid red"></div>
+  </foreignObject>
+</svg>
diff --git a/tests/wpt/tests/css/css-position/sticky/position-sticky-offset-print.html b/tests/wpt/tests/css/css-position/sticky/position-sticky-offset-print.html
new file mode 100644
index 00000000000..3954bbcf441
--- /dev/null
+++ b/tests/wpt/tests/css/css-position/sticky/position-sticky-offset-print.html
@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1485969">
+<link rel="match" href="../../reference/ref-filled-green-100px-square.xht">
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+<div id="scroller" style="position:relative; width:200px; height:100px; overflow:hidden;">
+  <div style="position:absolute; width:1000px;">
+    <div style="position:sticky; left:0; height:100px; width:100px; background:green;"></div>
+  </div>
+  <div style="width:100px; height:100px; background:red;"></div>
+</div>
+<script>
+document.getElementById('scroller').scrollLeft = 100;
+</script>
diff --git a/tests/wpt/tests/css/css-properties-values-api/determine-registration.html b/tests/wpt/tests/css/css-properties-values-api/determine-registration.html
index 20cddc48adc..99e39c191ec 100644
--- a/tests/wpt/tests/css/css-properties-values-api/determine-registration.html
+++ b/tests/wpt/tests/css/css-properties-values-api/determine-registration.html
@@ -46,6 +46,38 @@ test_with_at_property({
   });
 }, '@property later in document order wins');
 
+test_with_at_property({
+  syntax: '"<length>"',
+  inherits: false,
+  initialValue: '10px'
+}, (name1) => {
+  with_at_property({
+    name: name1,
+    syntax: '"<length>"',
+    inherits: true,
+    initialValue: '20px'
+  }, (name2) => {
+    assert_equals(name1, name2);
+    assert_equals(getComputedStyle(div).getPropertyValue(name2), '20px');
+  });
+}, '@property later in document order wins (overridding definition with inherits=true)');
+
+test_with_at_property({
+  syntax: '"<length>"',
+  inherits: true,
+  initialValue: '10px'
+}, (name1) => {
+  with_at_property({
+    name: name1,
+    syntax: '"<length>"',
+    inherits: false,
+    initialValue: '20px'
+  }, (name2) => {
+    assert_equals(name1, name2);
+    assert_equals(getComputedStyle(div).getPropertyValue(name2), '20px');
+  });
+}, '@property later in document order wins (overridding definition with inherits=false)');
+
 test(() => {
   let name = generate_name();
 
diff --git a/tests/wpt/tests/css/css-properties-values-api/get-computed-style-enumeration.html b/tests/wpt/tests/css/css-properties-values-api/get-computed-style-enumeration.html
new file mode 100644
index 00000000000..909247f69a8
--- /dev/null
+++ b/tests/wpt/tests/css/css-properties-values-api/get-computed-style-enumeration.html
@@ -0,0 +1,96 @@
+<!DOCTYPE html>
+<link rel="help" href="https://drafts.css-houdini.org/css-properties-values-api-1/#at-property-rule">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style>
+  @property --inherited-length-1 {
+      syntax: "<length>";
+      inherits: true;
+      initial-value: 10px;
+  }
+  @property --inherited-length-2 {
+      syntax: "<length>";
+      inherits: true;
+      initial-value: 20px;
+  }
+  @property --non-inherited-length-1 {
+      syntax: "<length>";
+      inherits: false;
+      initial-value: 30px;
+  }
+  @property --non-inherited-length-2 {
+      syntax: "<length>";
+      inherits: false;
+      initial-value: 40px;
+  }
+  @property --inherited-no-initial-value-1 {
+      syntax: "*";
+      inherits: true;
+  }
+  @property --inherited-no-initial-value-2 {
+      syntax: "*";
+      inherits: true;
+  }
+  @property --inherited-no-initial-value-3 {
+      syntax: "*";
+      inherits: true;
+  }
+  @property --non-inherited-no-initial-value-1 {
+      syntax: "*";
+      inherits: false;
+  }
+  @property --non-inherited-no-initial-value-2 {
+      syntax: "*";
+      inherits: false;
+  }
+  @property --non-inherited-no-initial-value-3 {
+      syntax: "*";
+      inherits: false;
+  }
+  #parent {
+      --inherited-no-initial-value-2: parent-A;
+      --non-inherited-no-initial-value-2: parent-B;
+      --non-registered-property-2: parent-C;
+  }
+  #node {
+      --inherited-length-1: 50px;
+      --non-inherited-length-1: 60px;
+      --inherited-no-initial-value-1: child-A;
+      --non-inherited-no-initial-value-1: child-B;
+      --non-registered-property-1: child-C;
+  }
+</style>
+<div id="parent"><div id="node"></div></div>
+<script>
+  let style = window.getComputedStyle(document.getElementById("node"));
+  let properties = new Map();
+  Array.from(style).filter(name => name.startsWith("--"))
+    .forEach(name => properties.set(name, style.getPropertyValue(name)));
+
+  test(() => {
+      assert_equals(properties.get("--inherited-length-1"), "50px");
+      assert_equals(properties.get("--non-inherited-length-1"), "60px");
+      assert_equals(properties.get("--inherited-no-initial-value-1"), "child-A");
+      assert_equals(properties.get("--non-inherited-no-initial-value-1"), "child-B");
+      assert_equals(properties.get("--non-registered-property-1"), "child-C");
+  }, "Custom properties specified on the node exposed when enumerating computed style.");
+
+  test(() => {
+      assert_equals(properties.get("--inherited-no-initial-value-2"), "parent-A");
+      assert_equals(properties.get("--non-registered-property-2"), "parent-C");
+  }, "Inherited custom properties specified on the parent exposed when enumerating computed style.");
+
+  test(() => {
+      assert_equals(properties.get("--inherited-length-2"), "20px");
+      assert_equals(properties.get("--non-inherited-length-2"), "40px");
+  }, "Unspecified properties with initial values exposed when enumerating computed style.");
+
+  test(() => {
+      assert_false(properties.has("--non-inherited-no-initial-value-2"));
+  }, "Non-inherited custom properties specified on the parent without initial values not exposed when enumerating computed style.");
+
+  test(() => {
+      assert_false(properties.has("--inherited-no-initial-value-3"), "inherited");
+      assert_false(properties.has("--non-inherited-no-initial-value-3"), "non-inherited");
+  }, "Unspecified properties without initial values not exposed when enumerating computed style.");
+</script>
diff --git a/tests/wpt/tests/css/css-properties-values-api/invalid-at-computed-value-time.html b/tests/wpt/tests/css/css-properties-values-api/invalid-at-computed-value-time.html
new file mode 100644
index 00000000000..56a7756f406
--- /dev/null
+++ b/tests/wpt/tests/css/css-properties-values-api/invalid-at-computed-value-time.html
@@ -0,0 +1,73 @@
+<!DOCTYPE HTML>
+<link rel="help" href="https://drafts.css-houdini.org/css-properties-values-api/#dom-propertydescriptor-inherits" />
+<link rel="help" href="https://drafts.css-houdini.org/css-properties-values-api/#register-a-custom-property" />
+<link rel="help" href="https://drafts.csswg.org/css-variables-2/#invalid-at-computed-value-time" />
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id=outer><div id=inner></div></div>
+<script>
+
+test(function(){
+    CSS.registerProperty({name: '--p1', syntax: '*', initialValue: '0px', inherits: true});
+    outer.style = '--p1: 42px';
+    inner.style = '--p1: var(--undefined)';
+    assert_equals(getComputedStyle(inner).getPropertyValue('--p1'), '');
+
+    CSS.registerProperty({name: '--p2', syntax: '*', initialValue: '0px', inherits: false});
+    outer.style = '--p2: 42px';
+    inner.style = '--p2: var(--undefined)';
+    assert_equals(getComputedStyle(inner).getPropertyValue('--p2'), '');
+}, "Universal syntax: Undefined reference results in guaranteed-invalid value.");
+
+test(function(){
+    CSS.registerProperty({name: '--p3', syntax: '<length>', initialValue: '0px', inherits: true});
+    outer.style = '--p3: 42px';
+    inner.style = '--p3: var(--undefined)';
+    assert_equals(getComputedStyle(inner).getPropertyValue('--p3'), '42px');
+
+    CSS.registerProperty({name: '--p4', syntax: '<length>', initialValue: '0px', inherits: false});
+    outer.style = '--p4: 42px';
+    inner.style = '--incompatible: nolength; --p4: var(--undefined)';
+    assert_equals(getComputedStyle(inner).getPropertyValue('--p4'), '0px');
+}, "Undefined reference results in unsetting the property.");
+
+test(function(){
+    CSS.registerProperty({name: '--p5', syntax: '<length>', initialValue: '0px', inherits: true});
+    outer.style = '--p5: 42px';
+    inner.style = '--incompatible: nolength; --p5: var(--incompatible)';
+    assert_equals(getComputedStyle(inner).getPropertyValue('--p5'), '42px');
+
+    CSS.registerProperty({name: '--p6', syntax: '<length>', initialValue: '0px', inherits: false});
+    outer.style = '--p6: 42px';
+    inner.style = '--incompatible: nolength; --p6: var(--incompatible)';
+    assert_equals(getComputedStyle(inner).getPropertyValue('--p6'), '0px');
+}, "Syntax-incompatible reference results in unsetting the property.");
+
+test(function(){
+    CSS.registerProperty({name: '--p7', syntax: '<length>', initialValue: '0px', inherits: true});
+    outer.style = '--p7: 42px';
+    inner.style = '--p7: var(--undefined, nolength)';
+    assert_equals(getComputedStyle(inner).getPropertyValue('--p7'), '42px');
+
+    CSS.registerProperty({name: '--p8', syntax: '<length>', initialValue: '0px', inherits: false});
+    outer.style = '--p8: 42px';
+    inner.style = 'var(--undefined, nolength)';
+    assert_equals(getComputedStyle(inner).getPropertyValue('--p8'), '0px');
+}, "Syntax-incompatible fallback results in unsetting the property.");
+
+test(function(){
+    const rootElement = document.documentElement;
+    CSS.registerProperty({name: '--p9', syntax: '<length>', initialValue: '0px', inherits: true});
+    rootElement.style = '--p9: var(--undefined);';
+    assert_equals(getComputedStyle(rootElement).getPropertyValue('--p9'), '0px');
+
+    CSS.registerProperty({name: '--p10', syntax: '<length>', initialValue: '0px', inherits: true});
+    rootElement.style = '--incompatible: nolength; --p10: var(--incompatible)';
+    assert_equals(getComputedStyle(rootElement).getPropertyValue('--p10'), '0px');
+
+    CSS.registerProperty({name: '--p11', syntax: '<length>', initialValue: '0px', inherits: true});
+    rootElement.style = '--p11: var(--undefined, nolength)';
+    assert_equals(getComputedStyle(rootElement).getPropertyValue('--p11'), '0px');
+}, "Unsetting inherited properties on the root results in initial value.");
+
+</script>
diff --git a/tests/wpt/tests/css/css-scoping/slotted-parsing.html b/tests/wpt/tests/css/css-scoping/slotted-parsing.html
index bed4dedd560..e4657b588af 100644
--- a/tests/wpt/tests/css/css-scoping/slotted-parsing.html
+++ b/tests/wpt/tests/css/css-scoping/slotted-parsing.html
@@ -27,13 +27,14 @@
   test_valid_selector("::slotted([attr]:hover)");
   test_valid_selector("::slotted(:not(.a))");
 
-  test_valid_selector("::slotted(*):is()");
-  test_valid_selector("::slotted(*):is(:hover)");
-  test_valid_selector("::slotted(*):is(#id)");
+  test_valid_forgiving_selector("::slotted(*):is()");
+  test_valid_forgiving_selector("::slotted(*):is(:hover)");
+  test_valid_forgiving_selector("::slotted(*):is(#id)");
 
-  test_valid_selector("::slotted(*):where()");
-  test_valid_selector("::slotted(*):where(:hover)");
-  test_valid_selector("::slotted(*):where(#id)");
+  test_valid_forgiving_selector("::slotted(*):where()");
+  test_valid_forgiving_selector("::slotted(*):where(:hover)");
+  test_valid_forgiving_selector("::slotted(*):where(#id)");
+  test_valid_forgiving_selector("::slotted(*):where(::before)");
 
   // Allow tree-abiding pseudo elements after ::slotted
   test_valid_selector("::slotted(*)::before");
diff --git a/tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-combinations-001.html b/tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-combinations-001.html
deleted file mode 100644
index 4b49e64323a..00000000000
--- a/tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-combinations-001.html
+++ /dev/null
@@ -1,41 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<link rel="help" href="https://drafts.csswg.org/css-text-4/#text-spacing-trim-property">
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-<script src="../support/get-char-advances.js"></script>
-<style>
-#container {
-  /* This test prefers fonts with the `halt` feature. */
-  font-family: 'Yu Gothic', 'Noto Sans CJK JP';
-  font-size: 10px;
-}
-</style>
-<div id="container">
-  <div expect="FFHF">国（（国</div>
-  <div expect="FFHF">国・（国</div>
-  <div expect="FFHF">国）（国</div>
-  <div expect="FFHF">国　（国</div>
-  <div expect="FHFF">国））国</div>
-  <div expect="FHFF">国）・国</div>
-  <div expect="FHFF">国）　国</div>
-  <div expect="FFHHF">国（（（国</div>
-  <div expect="FHHFF">国）））国</div>
-</div>
-<script>
-const range = document.createRange();
-
-function assertNode(element, expect) {
-  const advances = getCharAdvances(element);
-  const results = advances.map(advance => advance >= 8 ? 'F' : 'H');
-  const result = results.join('');
-  assert_equals(result, expect);
-}
-
-for (const element of document.querySelectorAll('div[expect]')) {
-  test(() => {
-    let expect = element.getAttribute('expect');
-    assertNode(element, expect);
-  }, `"${element.innerHTML}"`);
-}
-</script>
diff --git a/tests/wpt/tests/css/css-ui/parsing/form-sizing-computed.html b/tests/wpt/tests/css/css-ui/parsing/form-sizing-computed.html
index 557b1d5eb96..e508cd2050e 100644
--- a/tests/wpt/tests/css/css-ui/parsing/form-sizing-computed.html
+++ b/tests/wpt/tests/css/css-ui/parsing/form-sizing-computed.html
@@ -8,7 +8,7 @@
 <body>
 <div id="target"></div>
 <script>
-test_computed_value('form-sizing', 'auto');
-test_computed_value('form-sizing', 'normal');
+test_computed_value('form-sizing', 'fixed');
+test_computed_value('form-sizing', 'content');
 </script>
 </body>
diff --git a/tests/wpt/tests/css/css-ui/parsing/form-sizing-invalid.html b/tests/wpt/tests/css/css-ui/parsing/form-sizing-invalid.html
index 80ab546f90e..5589707b25e 100644
--- a/tests/wpt/tests/css/css-ui/parsing/form-sizing-invalid.html
+++ b/tests/wpt/tests/css/css-ui/parsing/form-sizing-invalid.html
@@ -9,6 +9,8 @@
 <script>
 test_invalid_value('form-sizing', 'none');
 test_invalid_value('form-sizing', 'legacy');
+test_invalid_value('form-sizing', 'auto');
+test_invalid_value('form-sizing', 'normal');
 test_invalid_value('form-sizing', 'normal auto');
 test_invalid_value('form-sizing', '100%');
 test_invalid_value('form-sizing', '10px');
diff --git a/tests/wpt/tests/css/css-ui/parsing/form-sizing-valid.html b/tests/wpt/tests/css/css-ui/parsing/form-sizing-valid.html
index f7cc8f44c3c..d9d39f79132 100644
--- a/tests/wpt/tests/css/css-ui/parsing/form-sizing-valid.html
+++ b/tests/wpt/tests/css/css-ui/parsing/form-sizing-valid.html
@@ -7,7 +7,7 @@
 <script src="/css/support/parsing-testcommon.js"></script>
 <body>
 <script>
-test_valid_value('form-sizing', 'auto');
-test_valid_value('form-sizing', 'normal');
+test_valid_value('form-sizing', 'fixed');
+test_valid_value('form-sizing', 'content');
 </script>
 </body>
diff --git a/tests/wpt/tests/css/css-writing-modes/forms/file-input-computed-style.html b/tests/wpt/tests/css/css-writing-modes/forms/file-input-computed-style.html
new file mode 100644
index 00000000000..417534e9bd6
--- /dev/null
+++ b/tests/wpt/tests/css/css-writing-modes/forms/file-input-computed-style.html
@@ -0,0 +1,39 @@
+<!doctype html>
+<meta charset="utf-8">
+<link rel="author" title="Aditya Keerthi" href="https://github.com/pxlcoder">
+<link rel="help" href="https://drafts.csswg.org/css-writing-modes/#block-flow">
+<title>File input writing mode computed style</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<input type="file" id="horizontal-input" style="writing-mode: horizontal-tb">
+<input type="file" id="vertical-lr-input" style="writing-mode: vertical-lr">
+<input type="file" id="vertical-rl-input" style="writing-mode: vertical-rl">
+
+<script>
+for (const element of document.querySelectorAll("[id^='horizontal-']")) {
+    test(() => {
+        const style = getComputedStyle(element);
+        const blockSize = parseInt(style.blockSize, 10);
+        const inlineSize = parseInt(style.inlineSize, 10);
+        assert_not_equals(blockSize, 0);
+        assert_not_equals(inlineSize, 0);
+        assert_greater_than(inlineSize, blockSize);
+        assert_equals(style.blockSize, style.height);
+        assert_equals(style.inlineSize, style.width);
+    }, `${element.id} block size should match height and inline size should match width`);
+}
+
+for (const element of document.querySelectorAll("[id^='vertical-']")) {
+    test(() => {
+        const style = getComputedStyle(element);
+        const blockSize = parseInt(style.blockSize, 10);
+        const inlineSize = parseInt(style.inlineSize, 10);
+        assert_not_equals(blockSize, 0);
+        assert_not_equals(inlineSize, 0);
+        assert_greater_than(inlineSize, blockSize);
+        assert_equals(style.blockSize, style.width);
+        assert_equals(style.inlineSize, style.height);
+    }, `${element.id} block size should match width and inline size should match height`);
+}
+</script>
diff --git a/tests/wpt/tests/css/css-writing-modes/forms/file-input-horizontal.optional.html b/tests/wpt/tests/css/css-writing-modes/forms/file-input-horizontal.optional.html
new file mode 100644
index 00000000000..b7bcb340e0e
--- /dev/null
+++ b/tests/wpt/tests/css/css-writing-modes/forms/file-input-horizontal.optional.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<link rel="author" title="Aditya Keerthi" href="https://github.com/pxlcoder">
+<link rel="help" href="https://html.spec.whatwg.org/#file-upload-state-(type=file)">
+<link rel="help" href="https://drafts.csswg.org/css-writing-modes-4/#block-flow">
+<title>File input writing mode horizontal</title>
+<meta charset="utf-8">
+<link rel="mismatch" href="file-input-vertical.optional.html">
+<link rel="mismatch" href="file-input-vertical-rtl.optional.html">
+
+<!-- Note test description should be the same across all files to mismatch on. -->
+<p>The file input below should match the correct writing mode.</p>
+<input type="file" style="writing-mode: horizontal-tb">
diff --git a/tests/wpt/tests/css/css-writing-modes/forms/file-input-vertical-rtl.optional.html b/tests/wpt/tests/css/css-writing-modes/forms/file-input-vertical-rtl.optional.html
new file mode 100644
index 00000000000..b58242555b3
--- /dev/null
+++ b/tests/wpt/tests/css/css-writing-modes/forms/file-input-vertical-rtl.optional.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<link rel="author" title="Aditya Keerthi" href="https://github.com/pxlcoder">
+<link rel="help" href="https://html.spec.whatwg.org/#file-upload-state-(type=file)">
+<link rel="help" href="https://drafts.csswg.org/css-writing-modes-4/#block-flow">
+<title>File input writing mode vertical RTL</title>
+<meta charset="utf-8">
+<link rel="mismatch" href="file-input-horizontal.optional.html">
+<link rel="mismatch" href="file-input-vertical.optional.html">
+
+<!-- Note test description should be the same across all files to mismatch on. -->
+<p>The file input below should match the correct writing mode.</p>
+<input type="file" style="writing-mode: vertical-lr; direction: rtl;">
diff --git a/tests/wpt/tests/css/css-writing-modes/forms/file-input-vertical.optional.html b/tests/wpt/tests/css/css-writing-modes/forms/file-input-vertical.optional.html
new file mode 100644
index 00000000000..c9b4272f84b
--- /dev/null
+++ b/tests/wpt/tests/css/css-writing-modes/forms/file-input-vertical.optional.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<link rel="author" title="Aditya Keerthi" href="https://github.com/pxlcoder">
+<link rel="help" href="https://html.spec.whatwg.org/#file-upload-state-(type=file)">
+<link rel="help" href="https://drafts.csswg.org/css-writing-modes-4/#block-flow">
+<title>File input writing mode vertical</title>
+<meta charset="utf-8">
+<link rel="mismatch" href="file-input-vertical-rtl.optional.html">
+<link rel="mismatch" href="file-input-horizontal.optional.html">
+
+<!-- Note test description should be the same across all files to mismatch on. -->
+<p>The file input below should match the correct writing mode.</p>
+<input type="file" style="writing-mode: vertical-lr">
diff --git a/tests/wpt/tests/css/css-writing-modes/forms/select-multiple-keyboard-selection.optional.html b/tests/wpt/tests/css/css-writing-modes/forms/select-multiple-keyboard-selection.optional.html
new file mode 100644
index 00000000000..1b160946f5c
--- /dev/null
+++ b/tests/wpt/tests/css/css-writing-modes/forms/select-multiple-keyboard-selection.optional.html
@@ -0,0 +1,87 @@
+<!doctype html>
+<link rel="author" title="Aditya Keerthi" href="https://github.com/pxlcoder">
+<link rel="help" href="https://html.spec.whatwg.org/#the-select-element">
+<link rel="help" href="https://drafts.csswg.org/css-writing-modes-4/#block-flow">
+<title>Test &lt;select&gt; multiple keyboard selection</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-actions.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+
+<select multiple size="4"></select>
+<script>
+const select = document.querySelector("select");
+for (let i = 0; i < 5; i++) {
+    const option = document.createElement("option");
+    option.textContent = `Option ${i + 1}`;
+    select.appendChild(option);
+}
+
+const arrow_left = "\uE012";
+const arrow_up = "\uE013";
+const arrow_right = "\uE014";
+const arrow_down = "\uE015";
+
+for (const writingMode of ["horizontal-tb", "vertical-lr", "vertical-rl", "sideways-lr", "sideways-rl"]) {
+    if (!CSS.supports(`writing-mode: ${writingMode}`))
+        continue;
+
+    const isHorizontal = writingMode === "horizontal-tb";
+    const isReversedBlockFlowDirection = writingMode.endsWith("-rl");
+    const scrollBlockAxis = isHorizontal ? "scrollTop" : "scrollLeft";
+
+    let nextKey = isHorizontal ? arrow_down : arrow_right;
+    let previousKey = isHorizontal ? arrow_up : arrow_left;
+
+    if (isReversedBlockFlowDirection) {
+        [nextKey, previousKey] = [previousKey, nextKey];
+    }
+
+    promise_test(async function() {
+        select.selectedIndex = 0;
+        select.style.writingMode = writingMode;
+        this.add_cleanup(() => {
+            select.scrollTop = 0;
+            select.scrollLeft = 0;
+            select.removeAttribute("style");
+        });
+
+        assert_equals(select.value, "Option 1");
+        assert_equals(select[scrollBlockAxis], 0);
+
+        select.focus();
+
+        assert_equals(document.activeElement, select);
+
+        await test_driver.send_keys(document.activeElement, previousKey);
+        assert_equals(select.value, "Option 1");
+        assert_equals(select[scrollBlockAxis], 0);
+
+        await test_driver.send_keys(document.activeElement, nextKey);
+        assert_equals(select.value, "Option 2");
+        assert_equals(select[scrollBlockAxis], 0);
+
+        for (let i = 0; i < select.size - 1; i++) {
+            await test_driver.send_keys(document.activeElement, nextKey);
+        }
+
+        assert_equals(select.value, "Option 5");
+
+        if (!isReversedBlockFlowDirection) {
+            assert_true(select[scrollBlockAxis] > 0);
+        } else {
+            assert_true(select[scrollBlockAxis] < 0);
+        }
+
+        await test_driver.send_keys(document.activeElement, previousKey);
+        assert_equals(select.value, "Option 4");
+
+        if (!isReversedBlockFlowDirection) {
+            assert_true(select[scrollBlockAxis] > 0);
+        } else {
+            assert_true(select[scrollBlockAxis] < 0);
+        }
+    }, `select[multiple][style="writing-mode: ${writingMode}"] supports keyboard navigation`);
+};
+</script>
diff --git a/tests/wpt/tests/css/selectors/is-where-parsing.html b/tests/wpt/tests/css/selectors/is-where-parsing.html
index 3159ecfe6a6..6d404dd953b 100644
--- a/tests/wpt/tests/css/selectors/is-where-parsing.html
+++ b/tests/wpt/tests/css/selectors/is-where-parsing.html
@@ -5,27 +5,20 @@
 <link rel="help" href="https://drafts.csswg.org/selectors-4/#zero-matches">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
-<style id="test-sheet">
-  random-selector { color: blue; }
-</style>
+<script src="/css/support/parsing-testcommon.js"></script>
 <script>
-  let rule = document.getElementById("test-sheet").sheet.cssRules[0];
-  function assert_valid(expected_parseable, pattern, expected_pattern, description) {
-    test(function() {
-      for (let pseudo of ["is", "where"]) {
-        let selector = pattern.replace("{}", ":" + pseudo);
-        let expected_selector = selector;
-        if (expected_pattern != null)
-          expected_selector = expected_pattern.replace("{}", ":" + pseudo);
-        rule.selectorText = "random-selector";
-        rule.selectorText = selector;
-        (expected_parseable ? assert_equals : assert_not_equals)(
-          rule.selectorText,
-          expected_selector,
-          `${description}: ${selector}`
-        );
+  function assert_valid(valid, pattern, expected_pattern, description) {
+    for (let pseudo of ["is", "where"]) {
+      let selector = pattern.replace("{}", ":" + pseudo);
+      let expected_selector = selector;
+      if (expected_pattern != null)
+        expected_selector = expected_pattern.replace("{}", ":" + pseudo);
+      if (valid) {
+        test_valid_selector(selector, expected_selector);
+      } else {
+        test_valid_forgiving_selector(selector);
       }
-    }, description);
+    }
   }
 
   assert_valid(true, "{}(div )", "{}(div)", "Trailing whitespace");
@@ -42,12 +35,11 @@
   assert_valid(true, "{}(:hover, :active)", null, "Pseudo-classes inside");
   assert_valid(true, "{}(div):hover", null, "Pseudo-classes after");
   assert_valid(true, "{}(div)::before", null, "Pseudo-elements after");
-  // Should ask clarification from CSSWG
-  assert_valid(true, "{}(::before)", null, "Pseudo-elements inside");
+  assert_valid(false, "{}(::before)", null, "Pseudo-elements inside");
 
   assert_valid(true, "{}(div) + bar", null, "Combinators after");
-  assert_valid(true, "::part(foo):is(:hover)", null, "After part with simple pseudo-class");
-  assert_valid(false, "::part(foo):is([attr='value'])", null, "After part with invalid selector after");
+  assert_valid(true, "::part(foo){}(:hover)", null, "After part with simple pseudo-class");
+  assert_valid(false, "::part(foo){}([attr='value'])", null, "After part with invalid selector after");
 
   assert_valid(true, ":not({}(div))", null, "Nested inside :not, without combinators");
   assert_valid(true, ":not({}(div .foo))", null, "Nested inside :not, with combinators");
diff --git a/tests/wpt/tests/css/selectors/parsing/parse-has-disallow-nesting-has-inside-has.html b/tests/wpt/tests/css/selectors/parsing/parse-has-disallow-nesting-has-inside-has.html
index a633c913d16..8ea816b5d89 100644
--- a/tests/wpt/tests/css/selectors/parsing/parse-has-disallow-nesting-has-inside-has.html
+++ b/tests/wpt/tests/css/selectors/parsing/parse-has-disallow-nesting-has-inside-has.html
@@ -8,6 +8,8 @@
 <script src="/css/support/parsing-testcommon.js"></script>
 <script>
   test_invalid_selector('.a:has(.b:has(.c))');
+  test_valid_forgiving_selector(':has(:is(:has(*)))');
+  test_valid_forgiving_selector(':has(:where(:has(*)))');
   test(() => {
     // It's not easy to check that these are invalid because :is() and :where()
     // use forgiving parsing. Check that they never match instead.
diff --git a/tests/wpt/tests/css/selectors/parsing/parse-has.html b/tests/wpt/tests/css/selectors/parsing/parse-has.html
index 3492373a336..949040838cf 100644
--- a/tests/wpt/tests/css/selectors/parsing/parse-has.html
+++ b/tests/wpt/tests/css/selectors/parsing/parse-has.html
@@ -37,5 +37,5 @@
   test_invalid_selector(':has()');
   test_invalid_selector(':has(123)');
   test_invalid_selector(':has(.a, 123)');
-  test_valid_selector(':has(:is(.a, 123))', [':has(:is(.a, 123))', ':has(:is(.a))']);
+  test_valid_forgiving_selector(':has(:is(.a, 123))');
 </script>
diff --git a/tests/wpt/tests/css/support/parsing-testcommon.js b/tests/wpt/tests/css/support/parsing-testcommon.js
index e480f26b3f3..93fd0090770 100644
--- a/tests/wpt/tests/css/support/parsing-testcommon.js
+++ b/tests/wpt/tests/css/support/parsing-testcommon.js
@@ -50,10 +50,14 @@ function test_invalid_value(property, value) {
     }, "e.style['" + property + "'] = " + stringifiedValue + " should not set the property value");
 }
 
+function test_valid_forgiving_selector(selector) {
+  test_valid_selector(selector, selector, { onlyWhenForgiving: true });
+}
+
 // serializedSelector can be the expected serialization of selector,
 // or an array of permitted serializations,
 // or omitted if value should serialize as selector.
-function test_valid_selector(selector, serializedSelector) {
+function test_valid_selector(selector, serializedSelector, options) {
     if (arguments.length < 2)
         serializedSelector = selector;
 
@@ -85,6 +89,9 @@ function test_valid_selector(selector, serializedSelector) {
         assert_equals(cssRules.length, 1, "Sheet should have 1 rule");
 
         assert_equals(cssRules[0].selectorText, readSelector, "serialization should round-trip");
+
+        let supports = !options?.onlyWhenForgiving;
+        assert_equals(CSS.supports(`selector(${selector})`), supports, "CSS.supports() reports the expected value");
     }, stringifiedSelector + " should be a valid selector");
 }
 
diff --git a/tests/wpt/tests/dom/observable/tentative/observable-constructor.any.js b/tests/wpt/tests/dom/observable/tentative/observable-constructor.any.js
new file mode 100644
index 00000000000..37c242661d6
--- /dev/null
+++ b/tests/wpt/tests/dom/observable/tentative/observable-constructor.any.js
@@ -0,0 +1,341 @@
+test(() => {
+  assert_implements(self.Observable, "The Observable interface is not implemented");
+
+  assert_true(
+    typeof Observable === "function",
+    "Observable constructor is defined"
+  );
+
+  assert_throws_js(TypeError, () => { new Observable(); });
+}, "Observable constructor");
+
+test(() => {
+  assert_implements(self.Subscriber, "The Subscriber interface is not implemented");
+  assert_true(
+    typeof Subscriber === "function",
+    "Subscriber interface is defined as a function"
+  );
+
+  assert_throws_js(TypeError, () => { new Subscriber(); });
+
+  new Observable(subscriber => {
+    assert_not_equals(subscriber, undefined, "A Subscriber must be passed into the subscribe callback");
+    assert_implements(subscriber.next, "A Subscriber object must have a next() method");
+    assert_implements(subscriber.complete, "A Subscriber object must have a complete() method");
+    assert_implements(subscriber.error, "A Subscriber object must have an error() method");
+  }).subscribe();
+}, "Subscriber interface is not constructible");
+
+test(() => {
+  let initializerCalled = false;
+  const source = new Observable(() => {
+    initializerCalled = true;
+  });
+
+  assert_false(
+    initializerCalled,
+    "initializer should not be called by construction"
+  );
+  source.subscribe();
+  assert_true(initializerCalled, "initializer should be called by subscribe");
+}, "subscribe() can be called with no arguments");
+
+test(() => {
+  let initializerCalled = false;
+  const results = [];
+
+  const source = new Observable((subscriber) => {
+    initializerCalled = true;
+    subscriber.next(1);
+    subscriber.next(2);
+    subscriber.next(3);
+    subscriber.complete();
+  });
+
+  assert_false(
+    initializerCalled,
+    "initializer should not be called by construction"
+  );
+
+  source.subscribe({
+    next: (x) => results.push(x),
+    error: () => assert_unreached("error should not be called"),
+    complete: () => results.push("complete"),
+  });
+
+  assert_true(initializerCalled, "initializer should be called by subscribe");
+  assert_array_equals(
+    results,
+    [1, 2, 3, "complete"],
+    "should emit values synchronously"
+  );
+}, "Observable constructor calls initializer on subscribe");
+
+test(() => {
+  const error = new Error("error");
+  const results = [];
+
+  const source = new Observable((subscriber) => {
+    subscriber.next(1);
+    subscriber.next(2);
+    subscriber.error(error);
+  });
+
+  source.subscribe({
+    next: () => assert_unreached("next should not be called"),
+    error: (e) => results.push(e),
+    complete: () => assert_unreached("complete should not be called"),
+  });
+
+  assert_array_equals(
+    results,
+    [1, 2, error],
+    "should emit error synchronously"
+  );
+}, "Observable error path called synchronously");
+
+test(() => {
+  const error = new Error("error");
+  const results = [];
+
+  const source = new Observable((subscriber) => {
+    subscriber.next(1);
+    throw error;
+    // TODO(https://github.com/WICG/observable/issues/76): If we add the
+    // `subscriber.closed` attribute, consider a try-finally block to assert
+    // that `subscriber.closed` is true after throwing. Also TODO: ensure that
+    // that would even be the right behavior.
+  });
+
+  source.subscribe({
+    next: (x) => results.push(x),
+    error: (e) => results.push(e),
+    complete: () => assert_unreached("complete should not be called"),
+  });
+
+  assert_array_equals(
+    results,
+    [1, error],
+    "should emit values and the throw error synchronously"
+  );
+}, "Observable should error if initializer throws");
+
+// TODO(https://github.com/WICG/observable/issues/76): If we decide the
+// `subscriber.closed` attribute is needed, re-visit these two tests that were
+// originally included:
+// https://github.com/web-platform-tests/wpt/blob/0246526ca46ef4e5eae8b8e4a87dd905c40f5326/dom/observable/tentative/observable-ctor.any.js#L123-L137.
+
+test(() => {
+  const results = [];
+
+  const source = new Observable((subscriber) => {
+    subscriber.next(1);
+    subscriber.next(2);
+    subscriber.complete();
+    subscriber.next(3);
+  });
+
+  source.subscribe({
+    next: (x) => results.push(x),
+    error: () => assert_unreached("error should not be called"),
+    complete: () => results.push("complete"),
+  });
+
+  assert_array_equals(
+    results,
+    [1, 2, "complete"],
+    "should emit values synchronously, but not nexted values after complete"
+  );
+}, "Subscription does not emit values after completion");
+
+test(() => {
+  const error = new Error("error");
+  const results = [];
+
+  const source = new Observable((subscriber) => {
+    subscriber.next(1);
+    subscriber.next(2);
+    subscriber.error(error);
+    subscriber.next(3);
+  });
+
+  source.subscribe({
+    next: (x) => results.push(x),
+    error: (e) => results.push(e),
+    complete: () => assert_unreached("complete should not be called"),
+  });
+
+  assert_array_equals(
+    results,
+    [1, 2, error],
+    "should emit values synchronously, but not nexted values after error"
+  );
+}, "Subscription does not emit values after error");
+
+test(() => {
+  const error = new Error("error");
+  const results = [];
+
+  const source = new Observable((subscriber) => {
+    subscriber.next(1);
+    subscriber.next(2);
+    subscriber.error(error);
+    // TODO(https://github.com/WICG/observable/issues/76): Assert
+    // `subscriber.closed` is true, if we add that attribute.
+    // assert_true(subscriber.closed, "subscriber is closed after error");
+    subscriber.next();
+    subscriber.complete();
+  });
+
+  source.subscribe({
+    next: (x) => results.push(x),
+    error: (error) => results.push(error),
+    complete: () => assert_unreached("complete should not be called"),
+  });
+
+  assert_array_equals(results, [1, 2, error], "should emit synchronously");
+}, "Completing or nexting a subscriber after an error does nothing");
+
+test(() => {
+  const error = new Error("error");
+  let errorReported = false;
+
+  self.addEventListener(
+    "error",
+    (e) => {
+      assert_equals(e.message, "Uncaught (in observable) error");
+      assert_equals(e.filename, location.href);
+      assert_greater_than(e.lineno, 0);
+      assert_greater_than(e.colno, 0);
+      assert_equals(e.error, error);
+      errorReported = true;
+    },
+    { once: true }
+  );
+
+  const source = new Observable((subscriber) => {
+    subscriber.error(error);
+  });
+
+  // No error handler provided.
+  source.subscribe({
+    next: () => assert_unreached("next should not be called"),
+    complete: () => assert_unreached("complete should not be called"),
+  });
+
+  assert_true(errorReported);
+}, "Errors pushed to the subscriber that are not handled by the subscription " +
+   "are reported to the global");
+
+test(() => {
+  const error = new Error("error");
+  let errorReported = false;
+
+  self.addEventListener(
+    "error",
+    (e) => {
+      assert_equals(e.message, "Uncaught (in observable) error");
+      assert_equals(e.filename, location.href);
+      assert_greater_than(e.lineno, 0);
+      assert_greater_than(e.colno, 0);
+      assert_equals(e.error, error);
+      errorReported = true;
+    },
+    { once: true }
+  );
+
+  const source = new Observable((subscriber) => {
+    throw error;
+  });
+
+  // No error handler provided.
+  source.subscribe({
+    next: () => assert_unreached("next should not be called"),
+    complete: () => assert_unreached("complete should not be called"),
+  });
+
+  assert_true(errorReported);
+}, "Errors thrown in the initializer that are not handled by the " +
+   "subscription are reported to the global");
+
+test(() => {
+  const error = new Error("error");
+  const results = [];
+  let errorReported = false;
+
+  self.addEventListener(
+    "error",
+    (e) => {
+      assert_equals(e.message, "Uncaught (in observable) error");
+      assert_equals(e.filename, location.href);
+      assert_greater_than(e.lineno, 0);
+      assert_greater_than(e.colno, 0);
+      assert_equals(e.error, error);
+      errorReported = true;
+    },
+    { once: true }
+  );
+
+  const source = new Observable((subscriber) => {
+    subscriber.next(1);
+    subscriber.next(2);
+    subscriber.complete();
+    subscriber.error(error);
+  });
+
+  source.subscribe({
+    next: (x) => results.push(x),
+    error: () => assert_unreached("error should not be called"),
+    complete: () => results.push("complete"),
+  });
+
+  assert_array_equals(
+    results,
+    [1, 2, "complete"],
+    "should emit values synchronously, but not error values after complete"
+  );
+
+  assert_true(errorReported);
+}, "Subscription reports errors that are pushed after subscriber is closed " +
+   "by completion");
+
+test(() => {
+  const error = new Error("error");
+  const results = [];
+  let errorReported = false;
+
+  self.addEventListener(
+    "error",
+    (e) => {
+      assert_equals(e.message, "Uncaught (in observable) error");
+      assert_equals(e.filename, location.href);
+      assert_greater_than(e.lineno, 0);
+      assert_greater_than(e.colno, 0);
+      assert_equals(e.error, error);
+      errorReported = true;
+    },
+    { once: true }
+  );
+
+  const source = new Observable((subscriber) => {
+    subscriber.next(1);
+    subscriber.next(2);
+    subscriber.complete();
+    throw error;
+  });
+
+  source.subscribe({
+    next: (x) => results.push(x),
+    error: () => assert_unreached("error should not be called"),
+    complete: () => results.push("complete"),
+  });
+
+  assert_array_equals(
+    results,
+    [1, 2, "complete"],
+    "should emit values synchronously, but not error after complete"
+  );
+
+  assert_true(errorReported);
+}, "Errors thrown by initializer function after subscriber is closed by " +
+   "completion are reported");
diff --git a/tests/wpt/tests/dom/parts/basic-dom-part-declarative-brace-syntax-innerhtml.tentative.html b/tests/wpt/tests/dom/parts/basic-dom-part-declarative-brace-syntax-innerhtml.tentative.html
new file mode 100644
index 00000000000..a1af7e89c29
--- /dev/null
+++ b/tests/wpt/tests/dom/parts/basic-dom-part-declarative-brace-syntax-innerhtml.tentative.html
@@ -0,0 +1,74 @@
+<!DOCTYPE html>
+<title>DOM Parts: Basic object structure, {{}} declarative API</title>
+<meta name="author" href="mailto:masonf@chromium.org">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="./resources/domparts-utils.js"></script>
+
+<div id=context_elements>
+  <div></div>
+  <div parseparts></div>
+  <template></template>
+  <template parseparts class=expect_success></template>
+</div>
+
+<script>
+function assertIsComment(node,commentText) {
+  assert_true(node instanceof Comment);
+  assert_equals(node.textContent,commentText);
+}
+
+const declarativeOpenerNoParseparts  = '<h1>';
+const declarativeOpenerParseparts  = '<h1 parseparts>';
+const declarativeContent  = '{{#}}First{{#}}<span {{}}>Middle</span>{{/}}Last{{/}}</h1>';
+
+Array.from(document.querySelectorAll('#context_elements>*')).forEach(contextEl => {
+  const expectParts = contextEl.classList.contains('expect_success');
+  [false,true].forEach(addParsePartsInside => {
+    const description = `${contextEl.outerHTML.split('><')[0]}><h1${addParsePartsInside ? " parseparts" : ""}>content...`;
+    const content = (addParsePartsInside ? declarativeOpenerParseparts : declarativeOpenerNoParseparts) + declarativeContent;
+
+    test((t) => {
+      const root = contextEl.content ? contextEl.content.getPartRoot() : document.getPartRoot();
+      assert_equals(root.getParts().length,0,'Should start with no parts');
+      t.add_cleanup(() => {
+        contextEl.replaceChildren();
+        root.getParts().forEach(part => part.disconnect());
+      });
+      contextEl.innerHTML = content;
+      if (expectParts) {
+        let expectedRootParts = [{type:'ChildNodePart',metadata:[]}];
+        assertEqualParts(root.getParts(),expectedRootParts,0,'declarative root missing parts');
+        const childPart1 = root.getParts()[0];
+        assertIsComment(childPart1.previousSibling,'');
+        assertIsComment(childPart1.nextSibling,'');
+        const expectedChild1Parts = [{type:'ChildNodePart',metadata:[]}];
+        assertEqualParts(childPart1.getParts(),expectedChild1Parts,0,'First level childpart should just have one child part');
+        const childPart2 = childPart1.getParts()[0];
+        assertIsComment(childPart2.previousSibling,'');
+        assertIsComment(childPart2.nextSibling,'');
+        const expectedChild2Parts = [{type:'NodePart',metadata:[]}];
+        assertEqualParts(childPart2.getParts(),expectedChild2Parts,0,'Second level childpart should have just the node part');
+        assert_true(childPart2.getParts()[0].node instanceof HTMLSpanElement);
+        assert_equals(childPart2.getParts()[0].node.textContent,'Middle');
+      } else {
+        assert_equals(root.getParts().length,0);
+      }
+    }, `Declarative DOM Parts innerHTML ${description} (expect${expectParts ? "" : " no"} parts)`);
+  });
+});
+
+test((t) => {
+  const tmpl = document.createElement('template');
+  tmpl.parseparts = true;
+  // See crbug.com/1490375.
+  tmpl.innerHTML = '<div {{}}></div>';
+  const root = tmpl.content.getPartRoot();
+  t.add_cleanup(() => {
+    tmpl.remove();
+    root.getParts().forEach(part => part.disconnect());
+  });
+  assert_equals(root.getParts().length,1,'There should be one NodePart');
+}, `Basic NodePart parsing`);
+</script>
+
diff --git a/tests/wpt/tests/dom/parts/basic-dom-part-objects.tentative.html b/tests/wpt/tests/dom/parts/basic-dom-part-objects.tentative.html
index af77b28b02f..d7adf61739c 100644
--- a/tests/wpt/tests/dom/parts/basic-dom-part-objects.tentative.html
+++ b/tests/wpt/tests/dom/parts/basic-dom-part-objects.tentative.html
@@ -120,6 +120,7 @@ function addCleanup(t, part) {
 
     // Test cloning of the entire DocumentPartRoot.
     const clonedPartRoot = root.clone();
+    assertEqualParts(root.getParts(),rootExpectations,[nodePart,childNodePart],'cloning a part root should not change the original');
     const clonedContainer = clonedPartRoot.rootContainer;
     assert_true(clonedPartRoot instanceof DocumentPartRoot);
     assert_true(clonedContainer instanceof (useTemplate ? DocumentFragment : Document));
diff --git a/tests/wpt/tests/fledge/tentative/TODO b/tests/wpt/tests/fledge/tentative/TODO
index 7ec6d880801..2f3e72b2128 100644
--- a/tests/wpt/tests/fledge/tentative/TODO
+++ b/tests/wpt/tests/fledge/tentative/TODO
@@ -25,12 +25,13 @@ Need tests for (likely not a complete list):
     currently guaranteed to work, due to potential time skew between processes).
 * Multiple buyers.
 * Multiple interest groups with same owner.
-* Multiple origin auctions (buyer != publisher != seller).
 * Multiple frame tests (including join IG policy, run auction policy,
     loading URNs in fencedframes in other frames, loading component
     ad URNs in fenced frames of other frames, etc)
 * adAuctionConfig passed to reportResult().
 * Component auctions.
+  * Including cross-origin sellers.
+* clearOriginJoinedInterestGroups.
 * browserSignals fields in scoring/bidding methods.
 * In reporting methods, browserSignals fields: dataVersion, topLevelSeller,
     componentSeller, modifiedBid, adCost, madeHighestScoringOtherBid
diff --git a/tests/wpt/tests/fledge/tentative/cross-origin.https.sub.window.js b/tests/wpt/tests/fledge/tentative/cross-origin.https.sub.window.js
index 1c1d5f2f6b7..178b3284bd5 100644
--- a/tests/wpt/tests/fledge/tentative/cross-origin.https.sub.window.js
+++ b/tests/wpt/tests/fledge/tentative/cross-origin.https.sub.window.js
@@ -12,13 +12,18 @@
 
 const OTHER_ORIGIN1 = 'https://{{hosts[alt][]}}:{{ports[https][0]}}';
 const OTHER_ORIGIN2 = 'https://{{hosts[alt][]}}:{{ports[https][1]}}';
+const OTHER_ORIGIN3 = 'https://{{hosts[][]}}:{{ports[https][1]}}';
+const OTHER_ORIGIN4 = 'https://{{hosts[][www]}}:{{ports[https][0]}}';
+const OTHER_ORIGIN5 = 'https://{{hosts[][www]}}:{{ports[https][1]}}';
+const OTHER_ORIGIN6 = 'https://{{hosts[alt][www]}}:{{ports[https][0]}}';
+const OTHER_ORIGIN7 = 'https://{{hosts[alt][www]}}:{{ports[https][1]}}';
 
-// Runs "script" in "iframe" via an eval call. The iframe must have been
-// created by calling "createIframe()" below. "param" is passed to the
+// Runs "script" in "child_window" via an eval call. The "child_window" must
+// have been created by calling "createFrame()" below. "param" is passed to the
 // context "script" is run in, so can be used to pass objects that
 // "script" references that can't be serialized to a string, like
 // fencedFrameConfigs.
-async function runInIframe(test, iframe, script, param) {
+async function runInFrame(test, child_window, script, param) {
   const messageUuid = generateUuid(test);
   let receivedResponse = {};
 
@@ -34,27 +39,29 @@ async function runInIframe(test, iframe, script, param) {
       }
     }
     window.addEventListener('message', WaitForMessage);
-    iframe.contentWindow.postMessage(
+    child_window.postMessage(
         {messageUuid: messageUuid, script: script, param: param}, '*');
   });
   await promise;
   return receivedResponse.returnValue;
 }
 
-// Creates an iframe and navigates to a URL on "origin", and waits for the URL
-// to finish loading by waiting for the iframe to send an event. Then returns
-// the iframe.
+// Creates an frame and navigates it to a URL on "origin", and waits for the URL
+// to finish loading by waiting for the frame to send an event. Then returns
+// the frame's Window object. Depending on the value of "is_iframe", the created
+// frame will either be a new iframe, or a new top-level main frame. In the iframe
+// case, its "allow" field will be set to "permissions".
 //
 // Also adds a cleanup callback to "test", which runs all cleanup functions
-// added to the iframe and waits for them to complete, and then destroys the
-// iframe.
-async function createIframe(test, origin, permissions) {
-  const iframeUuid = generateUuid(test);
-  const iframeUrl = `${origin}${RESOURCE_PATH}iframe.sub.html?uuid=${iframeUuid}`;
-  let iframe = document.createElement('iframe');
-  await new Promise(function(resolve, reject) {
+// added within the frame and waits for them to complete, and then destroys the
+// iframe or closes the window.
+async function createFrame(test, origin, is_iframe = true, permissions = null) {
+  const frameUuid = generateUuid(test);
+  const frameUrl =
+      `${origin}${RESOURCE_PATH}subordinate-frame.sub.html?uuid=${frameUuid}`;
+  let promise = new Promise(function(resolve, reject) {
     function WaitForMessage(event) {
-      if (event.data.messageUuid != iframeUuid)
+      if (event.data.messageUuid != frameUuid)
         return;
       if (event.data.result === 'load complete') {
         resolve();
@@ -63,17 +70,38 @@ async function createIframe(test, origin, permissions) {
       }
     }
     window.addEventListener('message', WaitForMessage);
+  });
+
+  if (is_iframe) {
+    let iframe = document.createElement('iframe');
     if (permissions)
       iframe.allow = permissions;
-    iframe.src = iframeUrl;
+    iframe.src = frameUrl;
     document.body.appendChild(iframe);
 
     test.add_cleanup(async () => {
-      await runInIframe(test, iframe, "await test_instance.do_cleanup();");
+      await runInFrame(test, iframe.contentWindow, "await test_instance.do_cleanup();");
       document.body.removeChild(iframe);
     });
+
+    await promise;
+    return iframe.contentWindow;
+  }
+
+  let child_window = window.open(frameUrl);
+  test.add_cleanup(async () => {
+    await runInFrame(test, child_window, "await test_instance.do_cleanup();");
+    child_window.close();
   });
-  return iframe;
+
+  await promise;
+  return child_window;
+}
+
+// Wrapper around createFrame() that creates an iframe and optionally sets
+// permissions.
+async function createIframe(test, origin, permissions) {
+  return createFrame(test, origin, /*is_iframe=*/ true, permissions);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
@@ -85,7 +113,7 @@ subsetTest(promise_test, async test => {
   let iframe = await createIframe(test, document.location.origin);
 
   // Join a same-origin InterestGroup in a iframe navigated to its origin.
-  await runInIframe(test, iframe, `await joinInterestGroup(test_instance, "${uuid}");`);
+  await runInFrame(test, iframe, `await joinInterestGroup(test_instance, "${uuid}");`);
 
   // Run an auction using window.location.origin as a bidder. The IG should
   // make a bid and win an auction.
@@ -97,7 +125,7 @@ subsetTest(promise_test, async test => {
   let iframe = await createIframe(test, OTHER_ORIGIN1);
 
   // Join a cross-origin InterestGroup in a iframe navigated to its origin.
-  await runInIframe(test, iframe, `await joinInterestGroup(test_instance, "${uuid}");`);
+  await runInFrame(test, iframe, `await joinInterestGroup(test_instance, "${uuid}");`);
 
   // Run an auction in this frame using the other origin as a bidder. The IG should
   // make a bid and win an auction.
@@ -117,7 +145,7 @@ subsetTest(promise_test, async test => {
   let iframe = await createIframe(test, OTHER_ORIGIN1, 'join-ad-interest-group');
 
   // Join a cross-origin InterestGroup in a iframe navigated to its origin.
-  await runInIframe(test, iframe, `await joinInterestGroup(test_instance, "${uuid}");`);
+  await runInFrame(test, iframe, `await joinInterestGroup(test_instance, "${uuid}");`);
 
   // Run an auction in this frame using the other origin as a bidder. The IG should
   // make a bid and win an auction.
@@ -136,7 +164,7 @@ subsetTest(promise_test, async test => {
   // Try to join an InterestGroup in a cross-origin iframe whose permissions policy
   // blocks joining interest groups. An exception should be thrown, and the interest
   // group should not be joined.
-  await runInIframe(test, iframe,
+  await runInFrame(test, iframe,
                     `try {
                        await joinInterestGroup(test_instance, "${uuid}");
                      } catch (e) {
@@ -161,7 +189,7 @@ subsetTest(promise_test, async test => {
   // This should require a .well-known fetch to the parents origin, which will not
   // grant permission. The case where permission is granted is not yet testable.
   let interestGroup = JSON.stringify(createInterestGroupForOrigin(uuid, window.location.origin));
-  await runInIframe(test, iframe,
+  await runInFrame(test, iframe,
                     `joinInterestGroup(test_instance, "${uuid}", ${interestGroup})`);
 
   // Run an auction with this page's origin as a bidder. Since the join
@@ -180,10 +208,10 @@ subsetTest(promise_test, async test => {
   let iframe = await createIframe(test, document.location.origin);
 
   // Join a same-origin InterestGroup in a iframe navigated to its origin.
-  await runInIframe(test, iframe, `await joinInterestGroup(test_instance, "${uuid}");`);
+  await runInFrame(test, iframe, `await joinInterestGroup(test_instance, "${uuid}");`);
 
   // Run auction in same-origin iframe. This should succeed, by default.
-  await runInIframe(
+  await runInFrame(
     test, iframe,
     `await runBasicFledgeTestExpectingWinner(test_instance, "${uuid}");`);
 }, 'Run auction in same-origin iframe, default permissions.');
@@ -196,7 +224,7 @@ subsetTest(promise_test, async test => {
   let iframe = await createIframe(test, OTHER_ORIGIN1);
 
   // Run auction in cross-origin iframe. Currently, this is allowed by default.
-  await runInIframe(
+  await runInFrame(
       test, iframe,
       `await runBasicFledgeTestExpectingWinner(
            test_instance, "${uuid}",
@@ -211,7 +239,7 @@ subsetTest(promise_test, async test => {
   let iframe = await createIframe(test, OTHER_ORIGIN1, "run-ad-auction");
 
   // Run auction in cross-origin iframe that should allow the auction to occur.
-  await runInIframe(
+  await runInFrame(
       test, iframe,
       `await runBasicFledgeTestExpectingWinner(
            test_instance, "${uuid}",
@@ -227,7 +255,7 @@ subsetTest(promise_test, async test => {
   let iframe = await createIframe(test, OTHER_ORIGIN1, "run-ad-auction 'none'");
 
   // Run auction in cross-origin iframe that should not allow the auction to occur.
-  await runInIframe(
+  await runInFrame(
       test, iframe,
       `try {
          await runBasicFledgeAuction(test_instance, "${uuid}");
@@ -246,7 +274,7 @@ subsetTest(promise_test, async test => {
 
   let iframe = await createIframe(test, OTHER_ORIGIN1, `run-ad-auction ${OTHER_ORIGIN1}`);
 
-  await runInIframe(
+  await runInFrame(
       test, iframe,
       `await runBasicFledgeTestExpectingWinner(
         test_instance, "${uuid}",
@@ -271,7 +299,7 @@ subsetTest(promise_test, async test => {
   // with no fledge-related permissions.
   let iframe = await createIframe(
       test, OTHER_ORIGIN1, "join-ad-interest-group 'none'; run-ad-auction 'none'");
-  await runInIframe(
+  await runInFrame(
       test, iframe,
       `await createAndNavigateFencedFrame(test_instance, param);`,
       /*param=*/config);
@@ -284,7 +312,7 @@ subsetTest(promise_test, async test => {
 
   let iframe = await createIframe(
       test, OTHER_ORIGIN1, "join-ad-interest-group; run-ad-auction");
-  await runInIframe(
+  await runInFrame(
       test, iframe,
       `await joinInterestGroup(test_instance, "${uuid}");
        await runBasicFledgeAuctionAndNavigate(test_instance, "${uuid}");
@@ -298,7 +326,7 @@ subsetTest(promise_test, async test => {
   // Run an auction in an cross-origin iframe, and get the resulting FencedFrameConfig.
   let iframe = await createIframe(
       test, OTHER_ORIGIN1, "join-ad-interest-group; run-ad-auction");
-  let config = await runInIframe(
+  let config = await runInFrame(
       test, iframe,
       `await joinInterestGroup(test_instance, "${uuid}");
        let config = await runBasicFledgeTestExpectingWinner(test_instance, "${uuid}");
@@ -322,7 +350,7 @@ subsetTest(promise_test, async test => {
   // Run an auction in an cross-origin iframe, and get the resulting FencedFrameConfig.
   let iframe = await createIframe(
       test, OTHER_ORIGIN1, "join-ad-interest-group; run-ad-auction");
-  let config = await runInIframe(
+  let config = await runInFrame(
       test, iframe,
       `await joinInterestGroup(test_instance, "${uuid}");
        let config = await runBasicFledgeTestExpectingWinner(test_instance, "${uuid}");
@@ -336,7 +364,7 @@ subsetTest(promise_test, async test => {
   // first cross-origin iframe.
   let iframe2 = await createIframe(
     test, OTHER_ORIGIN2, "join-ad-interest-group 'none'; run-ad-auction 'none'");
-  await runInIframe(
+  await runInFrame(
       test, iframe2,
       `await createAndNavigateFencedFrame(test_instance, param);`,
       /*param=*/config);
@@ -345,3 +373,167 @@ subsetTest(promise_test, async test => {
       [ createBidderReportURL(uuid, '1', OTHER_ORIGIN1),
         createSellerReportURL(uuid, '1', OTHER_ORIGIN1)]);
 }, 'Run auction in cross-origin iframe and open winning ad in a fenced frame child of another cross-origin iframe.');
+
+////////////////////////////////////////////////////////////////////////////////
+// Other tests.
+////////////////////////////////////////////////////////////////////////////////
+
+subsetTest(promise_test, async test => {
+  const uuid = generateUuid(test);
+
+  let iframe = await createIframe(test, OTHER_ORIGIN1, "run-ad-auction");
+
+  // Do everything in a cross-origin iframe, and make sure correct top-frame origin is used.
+  await runInFrame(
+      test, iframe,
+      `const uuid = "${uuid}";
+       const renderURL = createRenderURL(uuid, /*script=*/null, /*signalsParam=*/'hostname');
+
+       await joinInterestGroup(
+          test_instance, uuid,
+          { trustedBiddingSignalsKeys: ['hostname'],
+            trustedBiddingSignalsURL: TRUSTED_BIDDING_SIGNALS_URL,
+            ads: [{ renderURL: renderURL }],
+            biddingLogicURL: createBiddingScriptURL({
+              generateBid:
+                  \`if (browserSignals.topWindowHostname !== "${document.location.hostname}")
+                      throw "Wrong topWindowHostname: " + browserSignals.topWindowHostname;
+                    if (trustedBiddingSignals.hostname !== '${window.location.hostname}')
+                      throw 'Wrong hostname: ' + trustedBiddingSignals.hostname;\`})});
+
+       await runBasicFledgeTestExpectingWinner(
+           test_instance, uuid,
+           { trustedScoringSignalsURL: TRUSTED_SCORING_SIGNALS_URL,
+            decisionLogicURL:
+            createDecisionScriptURL(
+              uuid,
+              { scoreAd:
+                    \`if (browserSignals.topWindowHostname !== "${document.location.hostname}")
+                        throw "Wrong topWindowHostname: " + browserSignals.topWindowHostname;
+                      if (trustedScoringSignals.renderURL["\${renderURL}"] !== '${window.location.hostname}')
+                        throw 'Wrong hostname: ' + trustedScoringSignals.renderURL["\${renderURL}"];\` })});`);
+}, 'Different top-frame origin.');
+
+subsetTest(promise_test, async test => {
+  const uuid = generateUuid(test);
+
+  let bidderOrigin = OTHER_ORIGIN1;
+  let sellerOrigin = OTHER_ORIGIN2;
+  let bidderSendReportToURL = createBidderReportURL(uuid, '1', OTHER_ORIGIN3);
+  let sellerSendReportToURL = createSellerReportURL(uuid, '2', OTHER_ORIGIN4);
+  let bidderBeaconURL = createBidderBeaconURL(uuid, '3', OTHER_ORIGIN5);
+  let sellerBeaconURL = createSellerBeaconURL(uuid, '4', OTHER_ORIGIN6);
+  let renderURL = createRenderURL(
+      uuid,
+      `window.fence.reportEvent({
+         eventType: "beacon",
+         eventData: window.location.href,
+         destination: ["buyer", "seller"]
+       })`,
+       /*signalsParams=*/null, OTHER_ORIGIN7);
+
+  let iframe = await createIframe(test, bidderOrigin, "join-ad-interest-group");
+  let interestGroup = createInterestGroupForOrigin(
+      uuid, bidderOrigin,
+      {biddingLogicURL: createBiddingScriptURL(
+        { origin: bidderOrigin,
+          generateBid: `if (browserSignals.topWindowHostname !== "${document.location.hostname}")
+                          throw "Wrong topWindowHostname: " + browserSignals.topWindowHostname;
+                        if (interestGroup.owner !== "${bidderOrigin}")
+                          throw "Wrong origin: " + interestGroup.owner;
+                        if (!interestGroup.biddingLogicURL.startsWith("${bidderOrigin}"))
+                          throw "Wrong origin: " + interestGroup.biddingLogicURL;
+                        if (interestGroup.ads[0].renderUrl != "${renderURL}")
+                          throw "Wrong renderURL: " + interestGroup.ads[0].renderUrl;
+                        if (browserSignals.seller !== "${sellerOrigin}")
+                          throw "Wrong origin: " + browserSignals.seller;`,
+          reportWin: `if (browserSignals.topWindowHostname !== "${document.location.hostname}")
+                        throw "Wrong topWindowHostname: " + browserSignals.topWindowHostname;
+                      if (browserSignals.seller !== "${sellerOrigin}")
+                        throw "Wrong seller: " + browserSignals.seller;
+                      if (browserSignals.interestGroupOwner !== "${bidderOrigin}")
+                        throw "Wrong interestGroupOwner: " + browserSignals.interestGroupOwner;
+                      if (browserSignals.renderURL !== "${renderURL}")
+                        throw "Wrong renderURL: " + browserSignals.renderURL;
+                      if (browserSignals.seller !== "${sellerOrigin}")
+                        throw "Wrong seller: " + browserSignals.seller;
+                      sendReportTo("${bidderSendReportToURL}");
+                      registerAdBeacon({beacon: "${bidderBeaconURL}"});` }),
+       ads: [{ renderURL: renderURL }]});
+  await runInFrame(
+      test, iframe,
+      `await joinInterestGroup(test_instance, "${uuid}", ${JSON.stringify(interestGroup)});`);
+
+  await runBasicFledgeAuctionAndNavigate(test, uuid,
+    { seller: sellerOrigin,
+      interestGroupBuyers: [bidderOrigin],
+      decisionLogicURL: createDecisionScriptURL(
+        uuid,
+        { origin: sellerOrigin,
+          scoreAd: `if (browserSignals.topWindowHostname !== "${document.location.hostname}")
+                      throw "Wrong topWindowHostname: " + browserSignals.topWindowHostname;
+                    if (auctionConfig.seller !== "${sellerOrigin}")
+                      throw "Wrong seller: " + auctionConfig.seller;
+                    if (auctionConfig.interestGroupBuyers[0] !== "${bidderOrigin}")
+                      throw "Wrong interestGroupBuyers: " + auctionConfig.interestGroupBuyers;
+                    if (browserSignals.interestGroupOwner !== "${bidderOrigin}")
+                      throw "Wrong interestGroupOwner: " + browserSignals.interestGroupOwner;
+                    if (browserSignals.renderURL !== "${renderURL}")
+                      throw "Wrong renderURL: " + browserSignals.renderURL;`,
+          reportResult: `if (browserSignals.topWindowHostname !== "${document.location.hostname}")
+                           throw "Wrong topWindowHostname: " + browserSignals.topWindowHostname;
+                         if (browserSignals.interestGroupOwner !== "${bidderOrigin}")
+                           throw "Wrong interestGroupOwner: " + browserSignals.interestGroupOwner;
+                         if (browserSignals.renderURL !== "${renderURL}")
+                           throw "Wrong renderURL: " + browserSignals.renderURL;
+                         sendReportTo("${sellerSendReportToURL}");
+                         registerAdBeacon({beacon: "${sellerBeaconURL}"});`})
+     });
+
+  await waitForObservedRequests(
+      uuid,
+      [ bidderSendReportToURL,
+        sellerSendReportToURL,
+        `${bidderBeaconURL}, body: ${renderURL}`,
+        `${sellerBeaconURL}, body: ${renderURL}`
+      ]);
+}, 'Single seller auction with as many distinct origins as possible (except no component ads).');
+
+subsetTest(promise_test, async test => {
+  const uuid = generateUuid(test);
+
+  // Join an interest group and run an auction with a winner. Use a tracking
+  // URL for the ad, so that if it's incorrectly loaded in this test, the
+  // waitForObservedRequests() at the end of the test will see it, and the
+  // test will fail.
+  await joinInterestGroup(
+      test, uuid,
+      {ads: [{renderURL: createTrackerURL(window.location.origin, uuid, 'track_get', 'renderURL')}]});
+  let config = await runBasicFledgeTestExpectingWinner(test, uuid);
+
+  // Try to navigate a fenced frame to the winning ad in a new same-origin
+  // window. This should fail. Unfortunately, there's no assertion that
+  // can be checked for, and can't communicate with the contents of the
+  // fenced frame to make sure the load fails.
+  //
+  // So instead, join an interest group with a different sendReportTo-url,
+  // overwriting the previously joined one, and run another auction, loading
+  // the winner in another fenced frame.
+  //
+  // Then wait to see that only the reporting URLs from that second auction
+  // are requested. They should almost always be requested after the URLs
+  // from the first auction.
+  let child_window =
+      await createFrame(test, document.location.origin, /*is_iframe=*/false);
+  await runInFrame(
+      test, child_window,
+      `await createAndNavigateFencedFrame(test_instance, param);
+       await joinInterestGroup(
+          test_instance, "${uuid}",
+          {biddingLogicURL: createBiddingScriptURL(
+              {reportWin: "sendReportTo('${createBidderReportURL(uuid, "2")}');" })});
+       await runBasicFledgeAuctionAndNavigate(test_instance, "${uuid}");`,
+      /*param=*/config);
+  await waitForObservedRequests(
+      uuid, [createBidderReportURL(uuid, "2"), createSellerReportURL(uuid)]);
+}, 'Run auction in main frame, try to open winning ad in different same-origin main frame.');
diff --git a/tests/wpt/tests/fledge/tentative/resources/decision-logic.sub.py b/tests/wpt/tests/fledge/tentative/resources/decision-logic.sub.py
index 165d9840028..d5ecd2db87a 100644
--- a/tests/wpt/tests/fledge/tentative/resources/decision-logic.sub.py
+++ b/tests/wpt/tests/fledge/tentative/resources/decision-logic.sub.py
@@ -40,8 +40,10 @@ def main(request, response):
               // Don't bid on interest group with the wrong uuid. This is to prevent
               // left over interest groups from other tests from affecting auction
               // results.
-              if (!browserSignals.renderUrl.endsWith('{{GET[uuid]}}'))
+              if (!browserSignals.renderUrl.endsWith('uuid={{GET[uuid]}}') &&
+                  !browserSignals.renderUrl.includes('uuid={{GET[uuid]}}&')) {
                 return 0;
+              }
 
               {{GET[scoreAd]}};
               return {desirability: 2 * bid, allowComponentAuction: true};
diff --git a/tests/wpt/tests/fledge/tentative/resources/fledge-util.js b/tests/wpt/tests/fledge/tentative/resources/fledge-util.js
index 7ed5b13f8d9..c89814507cb 100644
--- a/tests/wpt/tests/fledge/tentative/resources/fledge-util.js
+++ b/tests/wpt/tests/fledge/tentative/resources/fledge-util.js
@@ -162,8 +162,10 @@ function createDecisionScriptURL(uuid, params = {}) {
 // by the decision logic script before accepting a bid. "uuid" is expected to
 // be last.  "signalsParams" also has no effect, but is used by
 // trusted-scoring-signals.py to affect the response.
-function createRenderURL(uuid, script, signalsParams) {
-  let url = new URL(`${BASE_URL}resources/fenced-frame.sub.py`);
+function createRenderURL(uuid, script, signalsParams, origin) {
+  if (origin == null)
+    origin = new URL(BASE_URL).origin;
+  let url = new URL(`${origin}${RESOURCE_PATH}fenced-frame.sub.py`);
   if (script)
     url.searchParams.append('script', script);
   if (signalsParams)
diff --git a/tests/wpt/tests/fledge/tentative/resources/iframe.sub.html b/tests/wpt/tests/fledge/tentative/resources/subordinate-frame.sub.html
similarity index 80%
rename from tests/wpt/tests/fledge/tentative/resources/iframe.sub.html
rename to tests/wpt/tests/fledge/tentative/resources/subordinate-frame.sub.html
index 0bc0ea357f6..465f8e7bdf0 100644
--- a/tests/wpt/tests/fledge/tentative/resources/iframe.sub.html
+++ b/tests/wpt/tests/fledge/tentative/resources/subordinate-frame.sub.html
@@ -10,6 +10,14 @@
 <body>
 <script>
 
+  // This can be used for either iframes or top-level windows.
+  // If there is an opener, this is a top-level window, so
+  // send messages to the opener. Otherwise, this is an iframe,
+  // so send messages to the parent.
+  let message_dest = window.opener;
+  if (!message_dest)
+    message_dest = window.parent;
+
   // Fake Test class that only supports adding cleanup callbacks,
   // primarily to leave interest groups once the test is complete.
   function Test() {
@@ -31,8 +39,9 @@
   };
 
   // Create a bogus test instance that tracks cleanup callbacks. The
-  // parent frame is expected to run test_instance.do_cleanup() and
-  // wait for it to complete before destroying the frame.
+  // main frame managing the test is expected to post a message
+  // to run test_instance.do_cleanup() and wait for it to complete
+  // before destroying the frame.
   let test_instance = new Test();
 
   // Register a message event listener that listens for events with data
@@ -66,11 +75,12 @@
       message.result = e.toString();
     }
     message.messageUuid = event.data.messageUuid;
-    window.parent.postMessage(message, '*');
+
+    message_dest.postMessage(message, '*');
   });
 
-  // Inform parent that the iframe has finished loading.
-  window.parent.postMessage(
+  // Inform "message_dest" that the frame has finished loading.
+  message_dest.postMessage(
       {messageUuid: '{{GET[uuid]}}', result: 'load complete'},
       '*');
 </script>
diff --git a/tests/wpt/tests/fs/resources/test-helpers.js b/tests/wpt/tests/fs/resources/test-helpers.js
index f185e2f48b6..4bcf5d7e834 100644
--- a/tests/wpt/tests/fs/resources/test-helpers.js
+++ b/tests/wpt/tests/fs/resources/test-helpers.js
@@ -17,13 +17,9 @@ const LOCK_ACCESS = {
 };
 
 // Array of separators used to separate components in hierarchical paths.
-let kPathSeparators;
-if (navigator.userAgent.includes('Windows NT')) {
-  // Windows uses both '/' and '\' as path separators.
-  kPathSeparators = ['/', '\\'];
-} else {
-  kPathSeparators = ['/'];
-}
+// Consider both '/' and '\' as path separators to ensure file names are
+// platform-agnostic.
+let kPathSeparators = ['/', '\\'];
 
 async function getFileSize(handle) {
   const file = await handle.getFile();
diff --git a/tests/wpt/tests/fs/script-tests/FileSystemFileHandle-move.js b/tests/wpt/tests/fs/script-tests/FileSystemFileHandle-move.js
index dd848626e4a..c5d08f305d0 100644
--- a/tests/wpt/tests/fs/script-tests/FileSystemFileHandle-move.js
+++ b/tests/wpt/tests/fs/script-tests/FileSystemFileHandle-move.js
@@ -50,25 +50,15 @@ directory_test(async (t, root) => {
   assert_array_equals(await getSortedDirectoryEntries(root), ['file-1']);
 }, 'move(name) can be called multiple times');
 
-directory_test(async (t, root) => {
-  const dir = await root.getDirectoryHandle('dir', {create: true});
-  const handle = await createFileWithContents(t, 'file-before', 'foo', dir);
-  await promise_rejects_js(t, TypeError, handle.move('Lorem.'));
-
-  assert_array_equals(await getSortedDirectoryEntries(root), ['dir/']);
-  assert_array_equals(await getSortedDirectoryEntries(dir), ['file-before']);
-  assert_equals(await getFileContents(handle), 'foo');
-  assert_equals(await getFileSize(handle), 3);
-}, 'move(name) with a name with a trailing period should fail');
-
 directory_test(async (t, root) => {
   const handle = await createFileWithContents(t, 'file-before', 'foo', root);
   await promise_rejects_js(t, TypeError, handle.move('test/test'));
+  await promise_rejects_js(t, TypeError, handle.move('test\\test'));
 
   assert_array_equals(await getSortedDirectoryEntries(root), ['file-before']);
   assert_equals(await getFileContents(handle), 'foo');
   assert_equals(await getFileSize(handle), 3);
-}, 'move(name) with a name with invalid characters should fail');
+}, 'move(name) with a name with path separators should fail');
 
 directory_test(async (t, root) => {
   const handle = await createFileWithContents(t, 'file-before', 'abc', root);
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-01-ref.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-01-ref.html
new file mode 100644
index 00000000000..3462b908b3d
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-01-ref.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=ltr on the slot, paragraph in the light tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+div p {width: 50%; border: 1px dotted;}
+</style>
+</head>
+<body>
+
+<p>`dir=ltr` on the &lt;slot&gt;, paragraph in the light tree</p>
+<div id="host"><p>paragraph.</p></div>
+<p id="result">The HTML direction / computed CSS `direction` value for the paragraph is: ltr / ltr.</p>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-01.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-01.html
new file mode 100644
index 00000000000..2d6983cb14b
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-01.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=ltr on the slot, paragraph in the light tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<link rel="match" href="dir-shadow-01-ref.html">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+div p {width: 50%; border: 1px dotted;}
+</style>
+<script src="dir-shadow-utils.js"></script>
+</head>
+<body>
+
+<p>`dir=ltr` on the &lt;slot&gt;, paragraph in the light tree</p>
+<div id="host"><p>paragraph.</p></div>
+<p id="result">The HTML direction / computed CSS `direction` value for the paragraph is: </p>
+
+<script type="text/javascript">
+  let root = host.attachShadow({mode:"open"});
+  root.innerHTML = `
+    <slot dir="ltr"></slot>
+  `;
+  result.innerHTML += html_direction(host.firstChild) + " / " + getComputedStyle(host.firstChild).direction + '.';
+</script>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-02-ref.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-02-ref.html
new file mode 100644
index 00000000000..8f358cf6471
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-02-ref.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=ltr on the slot, paragraph in the light tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+div p {width: 50%; border: 1px dotted;}
+</style>
+</head>
+<body>
+
+<p>`dir=ltr` on the &lt;slot&gt;, paragraph in the light tree</p>
+<div id="host"><p>اختبر.</p></div>
+<p id="result">The HTML direction / computed CSS `direction` value for the paragraph is: ltr / ltr.</p>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-02.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-02.html
new file mode 100644
index 00000000000..0553ef9a333
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-02.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=ltr on the slot, paragraph in the light tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<link rel="match" href="dir-shadow-02-ref.html">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+div p {width: 50%; border: 1px dotted;}
+</style>
+<script src="dir-shadow-utils.js"></script>
+</head>
+<body>
+
+<p>`dir=ltr` on the &lt;slot&gt;, paragraph in the light tree</p>
+<div id="host"><p>اختبر.</p></div>
+<p id="result">The HTML direction / computed CSS `direction` value for the paragraph is: </p>
+
+<script type="text/javascript">
+  let root = host.attachShadow({mode:"open"});
+  root.innerHTML = `
+    <slot dir="ltr"></slot>
+  `;
+  result.innerHTML += html_direction(host.firstChild) + " / " + getComputedStyle(host.firstChild).direction + '.';
+</script>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-03-ref.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-03-ref.html
new file mode 100644
index 00000000000..a2f574820f2
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-03-ref.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=rtl on the slot, paragraph in the light tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+div p {width: 50%; border: 1px dotted;}
+</style>
+</head>
+<body>
+
+<p>`dir=rtl` on the &lt;slot&gt;, paragraph in the light tree</p>
+<div id="host"><p dir="rtl">paragraph.</p></div>
+<p id="result">The HTML direction / computed CSS `direction` value for the paragraph is: ltr / rtl.</p>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-03.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-03.html
new file mode 100644
index 00000000000..5986a9d0f74
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-03.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=rtl on the slot, paragraph in the light tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<link rel="match" href="dir-shadow-03-ref.html">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+div p {width: 50%; border: 1px dotted;}
+</style>
+<script src="dir-shadow-utils.js"></script>
+</head>
+<body>
+
+<p>`dir=rtl` on the &lt;slot&gt;, paragraph in the light tree</p>
+<div id="host"><p>paragraph.</p></div>
+<p id="result">The HTML direction / computed CSS `direction` value for the paragraph is: </p>
+
+<script type="text/javascript">
+  let root = host.attachShadow({mode:"open"});
+  root.innerHTML = `
+    <slot dir="rtl"></slot>
+  `;
+  result.innerHTML += html_direction(host.firstChild) + " / " + getComputedStyle(host.firstChild).direction + '.';
+</script>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-04-ref.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-04-ref.html
new file mode 100644
index 00000000000..5724b5b84db
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-04-ref.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=rtl on the slot, paragraph in the light tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+div p {width: 50%; border: 1px dotted;}
+</style>
+</head>
+<body>
+
+<p>`dir=rtl` on the &lt;slot&gt;, paragraph in the light tree</p>
+<div id="host"><p dir="rtl">اختبر.</p></div>
+<p id="result">The HTML direction / computed CSS `direction` value for the paragraph is: ltr / rtl.</p>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-04.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-04.html
new file mode 100644
index 00000000000..aa2ab9dc93e
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-04.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=rtl on the slot, paragraph in the light tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<link rel="match" href="dir-shadow-04-ref.html">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+div p {width: 50%; border: 1px dotted;}
+</style>
+<script src="dir-shadow-utils.js"></script>
+</head>
+<body>
+
+<p>`dir=rtl` on the &lt;slot&gt;, paragraph in the light tree</p>
+<div id="host"><p>اختبر.</p></div>
+<p id="result">The HTML direction / computed CSS `direction` value for the paragraph is: </p>
+
+<script type="text/javascript">
+  let root = host.attachShadow({mode:"open"});
+  root.innerHTML = `
+    <slot dir="rtl"></slot>
+  `;
+  result.innerHTML += html_direction(host.firstChild) + " / " + getComputedStyle(host.firstChild).direction + '.';
+</script>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-05-ref.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-05-ref.html
new file mode 100644
index 00000000000..13c5b16240c
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-05-ref.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=auto on the slot, paragraph in the light tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+div p {width: 50%; border: 1px dotted;}
+</style>
+</head>
+<body>
+
+<p>`dir=auto` on the &lt;slot&gt;, paragraph in the light tree</p>
+<div id="host"><p>paragraph.</p></div>
+<p id="result">The HTML direction / computed CSS `direction` value for the paragraph is: ltr / ltr.</p>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-05.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-05.html
new file mode 100644
index 00000000000..597cb8d5b8e
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-05.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=auto on the slot, paragraph in the light tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<link rel="match" href="dir-shadow-05-ref.html">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+div p {width: 50%; border: 1px dotted;}
+</style>
+<script src="dir-shadow-utils.js"></script>
+</head>
+<body>
+
+<p>`dir=auto` on the &lt;slot&gt;, paragraph in the light tree</p>
+<div id="host"><p>paragraph.</p></div>
+<p id="result">The HTML direction / computed CSS `direction` value for the paragraph is: </p>
+
+<script type="text/javascript">
+  let root = host.attachShadow({mode:"open"});
+  root.innerHTML = `
+    <slot dir="auto"></slot>
+  `;
+  result.innerHTML += html_direction(host.firstChild) + " / " + getComputedStyle(host.firstChild).direction + '.';
+</script>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-06-ref.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-06-ref.html
new file mode 100644
index 00000000000..ca54b3bb2c8
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-06-ref.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=auto on the slot, paragraph in the light tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+div p {width: 50%; border: 1px dotted;}
+</style>
+</head>
+<body>
+
+<p>`dir=auto` on the &lt;slot&gt;, paragraph in the light tree</p>
+<div id="host"><p dir="rtl">اختبر.</p></div>
+<p id="result">The HTML direction / computed CSS `direction` value for the paragraph is: ltr / rtl.</p>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-06.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-06.html
new file mode 100644
index 00000000000..6cfaf7fcecd
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-06.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=auto on the slot, paragraph in the light tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<link rel="match" href="dir-shadow-06-ref.html">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+div p {width: 50%; border: 1px dotted;}
+</style>
+<script src="dir-shadow-utils.js"></script>
+</head>
+<body>
+
+<p>`dir=auto` on the &lt;slot&gt;, paragraph in the light tree</p>
+<div id="host"><p>اختبر.</p></div>
+<p id="result">The HTML direction / computed CSS `direction` value for the paragraph is: </p>
+
+<script type="text/javascript">
+  let root = host.attachShadow({mode:"open"});
+  root.innerHTML = `
+    <slot dir="auto"></slot>
+  `;
+  result.innerHTML += html_direction(host.firstChild) + " / " + getComputedStyle(host.firstChild).direction + '.';
+</script>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-07-ref.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-07-ref.html
new file mode 100644
index 00000000000..0a2de4d398f
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-07-ref.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=ltr on the shadow host, paragraph in the light tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+div p {width: 50%; border: 1px dotted;}
+</style>
+</head>
+<body>
+
+<p>`dir=ltr` on the shadow host, paragraph in the light tree</p>
+<div id="host" dir="ltr"><p>paragraph.</p></div>
+<p id="result">The HTML direction / computed CSS `direction` value for the paragraph is: ltr / ltr.</p>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-07.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-07.html
new file mode 100644
index 00000000000..dd11f4a605d
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-07.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=ltr on the shadow host, paragraph in the light tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<link rel="match" href="dir-shadow-07-ref.html">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+div p {width: 50%; border: 1px dotted;}
+</style>
+<script src="dir-shadow-utils.js"></script>
+</head>
+<body>
+
+<p>`dir=ltr` on the shadow host, paragraph in the light tree</p>
+<div id="host" dir="ltr"><p>paragraph.</p></div>
+<p id="result">The HTML direction / computed CSS `direction` value for the paragraph is: </p>
+
+<script type="text/javascript">
+  let root = host.attachShadow({mode:"open"});
+  root.innerHTML = `
+    <slot></slot>
+  `;
+  result.innerHTML += html_direction(host.firstChild) + " / " + getComputedStyle(host.firstChild).direction + '.';
+</script>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-08-ref.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-08-ref.html
new file mode 100644
index 00000000000..09d8b24094f
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-08-ref.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=ltr on the shadow host, paragraph in the light tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+div p {width: 50%; border: 1px dotted;}
+</style>
+</head>
+<body>
+
+<p>`dir=ltr` on the shadow host, paragraph in the light tree</p>
+<div id="host" dir="ltr"><p>اختبر.</p></div>
+<p id="result">The HTML direction / computed CSS `direction` value for the paragraph is: ltr / ltr.</p>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-08.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-08.html
new file mode 100644
index 00000000000..8b1377d32ad
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-08.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=ltr on the shadow host, paragraph in the light tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<link rel="match" href="dir-shadow-08-ref.html">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+div p {width: 50%; border: 1px dotted;}
+</style>
+<script src="dir-shadow-utils.js"></script>
+</head>
+<body>
+
+<p>`dir=ltr` on the shadow host, paragraph in the light tree</p>
+<div id="host" dir="ltr"><p>اختبر.</p></div>
+<p id="result">The HTML direction / computed CSS `direction` value for the paragraph is: </p>
+
+<script type="text/javascript">
+  let root = host.attachShadow({mode:"open"});
+  root.innerHTML = `
+    <slot></slot>
+  `;
+  result.innerHTML += html_direction(host.firstChild) + " / " + getComputedStyle(host.firstChild).direction + '.';
+</script>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-09-ref.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-09-ref.html
new file mode 100644
index 00000000000..73b9cb14870
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-09-ref.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=rtl on the shadow host, paragraph in the light tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+div p {width: 50%; border: 1px dotted;}
+</style>
+</head>
+<body>
+
+<p>`dir=rtl` on the shadow host, paragraph in the light tree</p>
+<div id="host" dir="rtl"><p>paragraph.</p></div>
+<p id="result">The HTML direction / computed CSS `direction` value for the paragraph is: rtl / rtl.</p>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-09.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-09.html
new file mode 100644
index 00000000000..d9c66e79319
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-09.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=rtl on the shadow host, paragraph in the light tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<link rel="match" href="dir-shadow-09-ref.html">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+div p {width: 50%; border: 1px dotted;}
+</style>
+<script src="dir-shadow-utils.js"></script>
+</head>
+<body>
+
+<p>`dir=rtl` on the shadow host, paragraph in the light tree</p>
+<div id="host" dir="rtl"><p>paragraph.</p></div>
+<p id="result">The HTML direction / computed CSS `direction` value for the paragraph is: </p>
+
+<script type="text/javascript">
+  let root = host.attachShadow({mode:"open"});
+  root.innerHTML = `
+    <slot></slot>
+  `;
+  result.innerHTML += html_direction(host.firstChild) + " / " + getComputedStyle(host.firstChild).direction + '.';
+</script>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-10-ref.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-10-ref.html
new file mode 100644
index 00000000000..391e5047f91
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-10-ref.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=rtl on the shadow host, paragraph in the light tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+div p {width: 50%; border: 1px dotted;}
+</style>
+</head>
+<body>
+
+<p>`dir=rtl` on the shadow host, paragraph in the light tree</p>
+<div id="host" dir="rtl"><p>اختبر.</p></div>
+<p id="result">The HTML direction / computed CSS `direction` value for the paragraph is: rtl / rtl.</p>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-10.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-10.html
new file mode 100644
index 00000000000..ad35af808eb
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-10.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=rtl on the shadow host, paragraph in the light tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<link rel="match" href="dir-shadow-10-ref.html">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+div p {width: 50%; border: 1px dotted;}
+</style>
+<script src="dir-shadow-utils.js"></script>
+</head>
+<body>
+
+<p>`dir=rtl` on the shadow host, paragraph in the light tree</p>
+<div id="host" dir="rtl"><p>اختبر.</p></div>
+<p id="result">The HTML direction / computed CSS `direction` value for the paragraph is: </p>
+
+<script type="text/javascript">
+  let root = host.attachShadow({mode:"open"});
+  root.innerHTML = `
+    <slot></slot>
+  `;
+  result.innerHTML += html_direction(host.firstChild) + " / " + getComputedStyle(host.firstChild).direction + '.';
+</script>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-11-ref.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-11-ref.html
new file mode 100644
index 00000000000..ae7e849c977
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-11-ref.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=auto on the shadow host, paragraph in the light tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+div p {width: 50%; border: 1px dotted;}
+</style>
+</head>
+<body>
+
+<p>`dir=auto` on the shadow host, paragraph in the light tree</p>
+<div id="host" dir="auto"><p>paragraph.</p></div>
+<p id="result">The HTML direction / computed CSS `direction` value for the paragraph is: ltr / ltr.</p>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-11.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-11.html
new file mode 100644
index 00000000000..31e04f065e9
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-11.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=auto on the shadow host, paragraph in the light tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<link rel="match" href="dir-shadow-11-ref.html">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+div p {width: 50%; border: 1px dotted;}
+</style>
+<script src="dir-shadow-utils.js"></script>
+</head>
+<body>
+
+<p>`dir=auto` on the shadow host, paragraph in the light tree</p>
+<div id="host" dir="auto"><p>paragraph.</p></div>
+<p id="result">The HTML direction / computed CSS `direction` value for the paragraph is: </p>
+
+<script type="text/javascript">
+  let root = host.attachShadow({mode:"open"});
+  root.innerHTML = `
+    <slot></slot>
+  `;
+  result.innerHTML += html_direction(host.firstChild) + " / " + getComputedStyle(host.firstChild).direction + '.';
+</script>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-12-ref.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-12-ref.html
new file mode 100644
index 00000000000..6f6b40218a8
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-12-ref.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=auto on the shadow host, paragraph in the light tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+div p {width: 50%; border: 1px dotted;}
+</style>
+</head>
+<body>
+
+<p>`dir=auto` on the shadow host, paragraph in the light tree</p>
+<div id="host" dir="rtl"><p>اختبر.</p></div>
+<p id="result">The HTML direction / computed CSS `direction` value for the paragraph is: rtl / rtl.</p>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-12.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-12.html
new file mode 100644
index 00000000000..f6183a98d9d
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-12.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=auto on the shadow host, paragraph in the light tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<link rel="match" href="dir-shadow-12-ref.html">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+div p {width: 50%; border: 1px dotted;}
+</style>
+<script src="dir-shadow-utils.js"></script>
+</head>
+<body>
+
+<p>`dir=auto` on the shadow host, paragraph in the light tree</p>
+<div id="host" dir="rtl"><p>اختبر.</p></div>
+<p id="result">The HTML direction / computed CSS `direction` value for the paragraph is: </p>
+
+<script type="text/javascript">
+  let root = host.attachShadow({mode:"open"});
+  root.innerHTML = `<slot></slot>`;
+  result.innerHTML += html_direction(host.firstChild) + " / " + getComputedStyle(host.firstChild).direction + '.';
+</script>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-13-ref.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-13-ref.html
new file mode 100644
index 00000000000..a6ec54186fe
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-13-ref.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=ltr on the shadow host, paragraph in the shadow tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+div p {width: 50%; border: 1px dotted;}
+</style>
+</head>
+<body>
+
+<p>`dir=ltr` on the shadow host, paragraph in the shadow tree</p>
+<div id="host" dir="ltr"><p>paragraph.</p></div>
+<p id="result">The HTML direction / computed CSS `direction` value for the paragraph is: ltr / ltr.</p>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-13.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-13.html
new file mode 100644
index 00000000000..35a00e6d288
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-13.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=ltr on the shadow host, paragraph in the shadow tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<link rel="match" href="dir-shadow-13-ref.html">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+</style>
+<script src="dir-shadow-utils.js"></script>
+</head>
+<body>
+
+<p>`dir=ltr` on the shadow host, paragraph in the shadow tree</p>
+<div id="host" dir="ltr"></div>
+<p id="result">The HTML direction / computed CSS `direction` value for the paragraph is: </p>
+
+<script type="text/javascript">
+  let root = host.attachShadow({mode:"open"});
+  root.innerHTML = `<style>p {width: 50%; border: 1px dotted;}</style><p>paragraph.</p>`;
+  result.innerHTML += html_direction(root.querySelector('p')) + " / " + getComputedStyle(root.querySelector('p')).direction + '.';
+</script>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-14-ref.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-14-ref.html
new file mode 100644
index 00000000000..73d4eab9622
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-14-ref.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=ltr on the shadow host, paragraph in the shadow tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+div p {width: 50%; border: 1px dotted;}
+</style>
+</head>
+<body>
+
+<p>`dir=ltr` on the shadow host, paragraph in the shadow tree</p>
+<div id="host" dir="ltr"><p>اختبر.</p></div>
+<p id="result">The HTML direction / computed CSS `direction` value for the paragraph is: ltr / ltr.</p>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-14.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-14.html
new file mode 100644
index 00000000000..6aa4a639fd0
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-14.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=ltr on the shadow host, paragraph in the shadow tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<link rel="match" href="dir-shadow-14-ref.html">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+</style>
+<script src="dir-shadow-utils.js"></script>
+</head>
+<body>
+
+<p>`dir=ltr` on the shadow host, paragraph in the shadow tree</p>
+<div id="host" dir="ltr"></div>
+<p id="result">The HTML direction / computed CSS `direction` value for the paragraph is: </p>
+
+<script type="text/javascript">
+  let root = host.attachShadow({mode:"open"});
+  root.innerHTML = `<style>p {width: 50%; border: 1px dotted;}</style><p>اختبر.</p>`;
+  result.innerHTML += html_direction(root.querySelector('p')) + " / " + getComputedStyle(root.querySelector('p')).direction + '.';
+</script>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-15-ref.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-15-ref.html
new file mode 100644
index 00000000000..0139997e657
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-15-ref.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=rtl on the shadow host, paragraph in the shadow tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+div p {width: 50%; border: 1px dotted;}
+</style>
+</head>
+<body>
+
+<p>`dir=rtl` on the shadow host, paragraph in the shadow tree</p>
+<div id="host" dir="rtl"><p>paragraph.</p></div>
+<p id="result">The HTML direction / computed CSS `direction` value for the paragraph is: rtl / rtl.</p>
+
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-15.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-15.html
new file mode 100644
index 00000000000..37c05d283c2
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-15.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=rtl on the shadow host, paragraph in the shadow tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<link rel="match" href="dir-shadow-15-ref.html">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+</style>
+<script src="dir-shadow-utils.js"></script>
+</head>
+<body>
+
+<p>`dir=rtl` on the shadow host, paragraph in the shadow tree</p>
+<div id="host" dir="rtl"></div>
+<p id="result">The HTML direction / computed CSS `direction` value for the paragraph is: </p>
+
+<script type="text/javascript">
+  let root = host.attachShadow({mode:"open"});
+  root.innerHTML = `<style>p {width: 50%; border: 1px dotted;}</style><p>paragraph.</p>`;
+  result.innerHTML += html_direction(root.querySelector('p')) + " / " + getComputedStyle(root.querySelector('p')).direction + '.';
+</script>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-16-ref.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-16-ref.html
new file mode 100644
index 00000000000..926b7a900d7
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-16-ref.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=rtl on the shadow host, paragraph in the shadow tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+div p {width: 50%; border: 1px dotted;}
+</style>
+</head>
+<body>
+
+<p>`dir=rtl` on the shadow host, paragraph in the shadow tree</p>
+<div id="host" dir="rtl"><p>اختبر.</p></div>
+<p id="result">The HTML direction / computed CSS `direction` value for the paragraph is: rtl / rtl.</p>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-16.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-16.html
new file mode 100644
index 00000000000..2a8bb64a1bd
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-16.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=rtl on the shadow host, paragraph in the shadow tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<link rel="match" href="dir-shadow-16-ref.html">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+</style>
+<script src="dir-shadow-utils.js"></script>
+</head>
+<body>
+
+<p>`dir=rtl` on the shadow host, paragraph in the shadow tree</p>
+<div id="host" dir="rtl"></div>
+<p id="result">The HTML direction / computed CSS `direction` value for the paragraph is: </p>
+
+<script type="text/javascript">
+  let root = host.attachShadow({mode:"open"});
+  root.innerHTML = `<style>p {width: 50%; border: 1px dotted;}</style><p>اختبر.</p>`;
+  result.innerHTML += html_direction(root.querySelector('p')) + " / " + getComputedStyle(root.querySelector('p')).direction + '.';
+</script>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-17-ref.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-17-ref.html
new file mode 100644
index 00000000000..b17c3e191d8
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-17-ref.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=auto on the shadow host, paragraph in the shadow tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+div p {width: 50%; border: 1px dotted;}
+</style>
+</head>
+<body>
+
+<p>`dir=auto` on the shadow host, paragraph in the shadow tree</p>
+<div id="host" dir="auto"><p>paragraph.</p></div>
+<p id="result">The HTML direction / computed CSS `direction` value for the paragraph is: ltr / ltr.</p>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-17.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-17.html
new file mode 100644
index 00000000000..7016a271741
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-17.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=auto on the shadow host, paragraph in the shadow tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<link rel="match" href="dir-shadow-17-ref.html">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+</style>
+<script src="dir-shadow-utils.js"></script>
+</head>
+<body>
+
+<p>`dir=auto` on the shadow host, paragraph in the shadow tree</p>
+<div id="host" dir="auto"></div>
+<p id="result">The HTML direction / computed CSS `direction` value for the paragraph is: </p>
+
+<script type="text/javascript">
+  let root = host.attachShadow({mode:"open"});
+  root.innerHTML = `<style>p {width: 50%; border: 1px dotted;}</style><p>paragraph.</p>`;
+  result.innerHTML += html_direction(root.querySelector('p')) + " / " + getComputedStyle(root.querySelector('p')).direction + '.';
+</script>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-18-ref.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-18-ref.html
new file mode 100644
index 00000000000..6155a9f2c95
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-18-ref.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=auto on the shadow host, paragraph in the shadow tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+div p {width: 50%; border: 1px dotted;}
+</style>
+</head>
+<body>
+
+<p>`dir=auto` on the shadow host, paragraph in the shadow tree</p>
+<div id="host" dir="ltr"><p dir="">اختبر.</p></div>
+<p id="result">The HTML direction / computed CSS `direction` value for the paragraph is: ltr / ltr.</p>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-18.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-18.html
new file mode 100644
index 00000000000..6796dd18eaf
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-18.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=auto on the shadow host, paragraph in the shadow tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<link rel="match" href="dir-shadow-18-ref.html">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+</style>
+<script src="dir-shadow-utils.js"></script>
+</head>
+<body>
+
+<p>`dir=auto` on the shadow host, paragraph in the shadow tree</p>
+<div id="host" dir="auto"></div>
+<p id="result">The HTML direction / computed CSS `direction` value for the paragraph is: </p>
+
+<script type="text/javascript">
+  let root = host.attachShadow({mode:"open"});
+  root.innerHTML = `<style>p {width: 50%; border: 1px dotted;}</style><p>اختبر.</p>`;
+  result.innerHTML += html_direction(root.querySelector('p')) + " / " + getComputedStyle(root.querySelector('p')).direction + '.';
+</script>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-19-ref.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-19-ref.html
new file mode 100644
index 00000000000..61a9592a4a8
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-19-ref.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=ltr on the div (shadow host), text in the shadow tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+
+</style>
+</head>
+<body>
+
+<p>`dir=ltr` on the div (shadow host), text in the shadow tree</p>
+<div id="host" dir="ltr">text.</div>
+<p id="result">The HTML direction / computed CSS `direction` value for the host’s text is: ltr / ltr.</p>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-19.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-19.html
new file mode 100644
index 00000000000..a345a7b60d4
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-19.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=ltr on the div (shadow host), text in the shadow tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<link rel="match" href="dir-shadow-19-ref.html">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+</style>
+<script src="dir-shadow-utils.js"></script>
+</head>
+<body>
+
+<p>`dir=ltr` on the div (shadow host), text in the shadow tree</p>
+<div id="host" dir="ltr"></div>
+<p id="result">The HTML direction / computed CSS `direction` value for the host’s text is: </p>
+
+<script type="text/javascript">
+  let root = host.attachShadow({mode:"open"});
+  root.innerHTML = `text.`;
+  result.innerHTML += html_direction(host) + " / " + getComputedStyle(host).direction + '.';
+</script>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-20-ref.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-20-ref.html
new file mode 100644
index 00000000000..2e813817722
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-20-ref.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=ltr on the div (shadow host), text in the shadow tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+</style>
+</head>
+<body>
+
+<p>`dir=ltr` on the div (shadow host), text in the shadow tree</p>
+<div id="host" dir="ltr">اختبر.</div>
+<p id="result">The HTML direction / computed CSS `direction` value for the host’s text is: ltr / ltr.</p>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-20.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-20.html
new file mode 100644
index 00000000000..0072d9b6c96
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-20.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=ltr on the div (shadow host), text in the shadow tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<link rel="match" href="dir-shadow-20-ref.html">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+</style>
+<script src="dir-shadow-utils.js"></script>
+</head>
+<body>
+
+<p>`dir=ltr` on the div (shadow host), text in the shadow tree</p>
+<div id="host" dir="ltr"></div>
+<p id="result">The HTML direction / computed CSS `direction` value for the host’s text is: </p>
+
+<script type="text/javascript">
+  let root = host.attachShadow({mode:"open"});
+  root.innerHTML = `اختبر.`;
+  result.innerHTML += html_direction(host) + " / " + getComputedStyle(host).direction + '.';
+</script>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-21-ref.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-21-ref.html
new file mode 100644
index 00000000000..58c8d426f28
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-21-ref.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=rtl on the div (shadow host), text in the shadow tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+</style>
+</head>
+<body>
+
+<p>`dir=rtl` on the div (shadow host), text in the shadow tree</p>
+<div id="host" dir="rtl">text.</div>
+<p id="result">The HTML direction / computed CSS `direction` value for the host’s text is: rtl / rtl.</p>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-21.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-21.html
new file mode 100644
index 00000000000..5b9a4aa184b
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-21.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=rtl on the div (shadow host), text in the shadow tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<link rel="match" href="dir-shadow-21-ref.html">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+</style>
+<script src="dir-shadow-utils.js"></script>
+</head>
+<body>
+
+<p>`dir=rtl` on the div (shadow host), text in the shadow tree</p>
+<div id="host" dir="rtl"></div>
+<p id="result">The HTML direction / computed CSS `direction` value for the host’s text is: </p>
+
+<script type="text/javascript">
+  let root = host.attachShadow({mode:"open"});
+  root.innerHTML = `text.`;
+  result.innerHTML += html_direction(host) + " / " + getComputedStyle(host).direction + '.';
+</script>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-22-ref.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-22-ref.html
new file mode 100644
index 00000000000..6721da534f7
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-22-ref.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=rtl on the div (shadow host), text in the shadow tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+</style>
+</head>
+<body>
+
+<p>`dir=rtl` on the div (shadow host), text in the shadow tree</p>
+<div id="host" dir="rtl">اختبر.</div>
+<p id="result">The HTML direction / computed CSS `direction` value for the host’s text is: rtl / rtl.</p>
+
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-22.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-22.html
new file mode 100644
index 00000000000..009ba460ce1
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-22.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=rtl on the div (shadow host), text in the shadow tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<link rel="match" href="dir-shadow-22-ref.html">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+</style>
+<script src="dir-shadow-utils.js"></script>
+</head>
+<body>
+
+<p>`dir=rtl` on the div (shadow host), text in the shadow tree</p>
+<div id="host" dir="rtl"></div>
+<p id="result">The HTML direction / computed CSS `direction` value for the host’s text is: </p>
+
+<script type="text/javascript">
+  let root = host.attachShadow({mode:"open"});
+  root.innerHTML = `اختبر.`;
+  result.innerHTML += html_direction(host) + " / " + getComputedStyle(host).direction + '.';
+</script>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-23-ref.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-23-ref.html
new file mode 100644
index 00000000000..bf06a448470
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-23-ref.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=auto on the div (shadow host), text in the shadow tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+</style>
+</head>
+<body>
+
+<p>`dir=auto` on the div (shadow host), text in the shadow tree</p>
+<div id="host" dir="auto">text.</div>
+<p id="result">The HTML direction / computed CSS `direction` value for the host’s text is: ltr / ltr.</p>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-23.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-23.html
new file mode 100644
index 00000000000..dea79b93e13
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-23.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=auto on the div (shadow host), text in the shadow tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<link rel="match" href="dir-shadow-23-ref.html">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+</style>
+<script src="dir-shadow-utils.js"></script>
+</head>
+<body>
+
+<p>`dir=auto` on the div (shadow host), text in the shadow tree</p>
+<div id="host" dir="auto"></div>
+<p id="result">The HTML direction / computed CSS `direction` value for the host’s text is: </p>
+
+<script type="text/javascript">
+  let root = host.attachShadow({mode:"open"});
+  root.innerHTML = `text.`;
+  result.innerHTML += html_direction(host) + " / " + getComputedStyle(host).direction + '.';
+</script>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-24-ref.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-24-ref.html
new file mode 100644
index 00000000000..8453e945337
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-24-ref.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=auto on the div (shadow host), text in the shadow tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+</style>
+</head>
+<body>
+
+<p>`dir=auto` on the div (shadow host), text in the shadow tree</p>
+<div id="host" dir="ltr">اختبر.</div>
+<p id="result">The HTML direction / computed CSS `direction` value for the host’s text is: ltr / ltr.</p>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-24.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-24.html
new file mode 100644
index 00000000000..d26ccb270a2
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-24.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=auto on the div (shadow host), text in the shadow tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<link rel="match" href="dir-shadow-24-ref.html">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+</style>
+<script src="dir-shadow-utils.js"></script>
+</head>
+<body>
+
+<p>`dir=auto` on the div (shadow host), text in the shadow tree</p>
+<div id="host" dir="auto"></div>
+<p id="result">The HTML direction / computed CSS `direction` value for the host’s text is: </p>
+
+<script type="text/javascript">
+  let root = host.attachShadow({mode:"open"});
+  root.innerHTML = `اختبر.`;
+  result.innerHTML += html_direction(host) + " / " + getComputedStyle(host).direction + '.';
+</script>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-25-ref.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-25-ref.html
new file mode 100644
index 00000000000..5a2f6d57776
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-25-ref.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=ltr on a paragraph in the shadow tree, text in the light tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+div p {width: 50%; border: 1px dotted;}
+</style>
+</head>
+<body>
+
+<p>`dir=ltr` on a paragraph in the shadow tree, text in the light tree</p>
+<div id="host">
+<p dir="ltr">paragraph.</p>
+</div>
+<p id="result">The HTML direction / computed CSS `direction` value for the paragraph is: ltr / ltr.</p>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-25.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-25.html
new file mode 100644
index 00000000000..508b8260ff9
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-25.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=ltr on a paragraph in the shadow tree, text in the light tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<link rel="match" href="dir-shadow-25-ref.html">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+</style>
+<script src="dir-shadow-utils.js"></script>
+</head>
+<body>
+
+<p>`dir=ltr` on a paragraph in the shadow tree, text in the light tree</p>
+<div id="host">
+paragraph.
+</div>
+<p id="result">The HTML direction / computed CSS `direction` value for the paragraph is: </p>
+
+<script type="text/javascript">
+  let root = host.attachShadow({mode:"open"});
+  root.innerHTML = `<style>p {width: 50%; border: 1px dotted;}</style><p dir="ltr"><slot></slot></p>`;
+  result.innerHTML += html_direction(root.querySelector('p')) + " / " + getComputedStyle(root.querySelector('p')).direction + '.';
+</script>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-26-ref.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-26-ref.html
new file mode 100644
index 00000000000..41e1dbc8a81
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-26-ref.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=ltr on a paragraph in the shadow tree, text in the light tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+div p {width: 50%; border: 1px dotted;}
+</style>
+</head>
+<body>
+
+<p>`dir=ltr` on a paragraph in the shadow tree, text in the light tree</p>
+<div id="host">
+<p dir="ltr">اختبر.</p>
+</div>
+<p id="result">The HTML direction / computed CSS `direction` value for the paragraph is: ltr / ltr.</p>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-26.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-26.html
new file mode 100644
index 00000000000..b19cb976f88
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-26.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=ltr on a paragraph in the shadow tree, text in the light tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<link rel="match" href="dir-shadow-26-ref.html">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+</style>
+<script src="dir-shadow-utils.js"></script>
+</head>
+<body>
+
+<p>`dir=ltr` on a paragraph in the shadow tree, text in the light tree</p>
+<div id="host">
+اختبر.
+</div>
+<p id="result">The HTML direction / computed CSS `direction` value for the paragraph is: </p>
+
+<script type="text/javascript">
+  let root = host.attachShadow({mode:"open"});
+  root.innerHTML = `<style>p {width: 50%; border: 1px dotted;}</style><p dir="ltr"><slot></slot></p>`;
+  result.innerHTML += html_direction(root.querySelector('p')) + " / " + getComputedStyle(root.querySelector('p')).direction + '.';
+</script>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-27-ref.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-27-ref.html
new file mode 100644
index 00000000000..075230d055c
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-27-ref.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=rtl on a paragraph in the shadow tree, text in the light tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+div p {width: 50%; border: 1px dotted;}
+</style>
+</head>
+<body>
+
+<p>`dir=rtl` on a paragraph in the shadow tree, text in the light tree</p>
+<div id="host">
+<p dir="rtl">paragraph.</p>
+</div>
+<p id="result">The HTML direction / computed CSS `direction` value for the paragraph is: rtl / rtl.</p>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-27.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-27.html
new file mode 100644
index 00000000000..8380f17b218
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-27.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=rtl on a paragraph in the shadow tree, text in the light tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<link rel="match" href="dir-shadow-27-ref.html">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+</style>
+<script src="dir-shadow-utils.js"></script>
+</head>
+<body>
+
+<p>`dir=rtl` on a paragraph in the shadow tree, text in the light tree</p>
+<div id="host">
+paragraph.
+</div>
+<p id="result">The HTML direction / computed CSS `direction` value for the paragraph is: </p>
+
+<script type="text/javascript">
+  let root = host.attachShadow({mode:"open"});
+  root.innerHTML = `<style>p {width: 50%; border: 1px dotted;}</style><p dir="rtl"><slot></slot></p>`;
+  result.innerHTML += html_direction(root.querySelector('p')) + " / " + getComputedStyle(root.querySelector('p')).direction + '.';
+</script>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-28-ref.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-28-ref.html
new file mode 100644
index 00000000000..580f5fe3b11
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-28-ref.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=rtl on a paragraph in the shadow tree, text in the light tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+div p {width: 50%; border: 1px dotted;}
+</style>
+</head>
+<body>
+
+<p>`dir=rtl` on a paragraph in the shadow tree, text in the light tree</p>
+<div id="host">
+<p dir="rtl">اختبر.</p>
+</div>
+<p id="result">The HTML direction / computed CSS `direction` value for the paragraph is: rtl / rtl.</p>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-28.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-28.html
new file mode 100644
index 00000000000..3a0d6756b35
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-28.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=rtl on a paragraph in the shadow tree, text in the light tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<link rel="match" href="dir-shadow-28-ref.html">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+</style>
+<script src="dir-shadow-utils.js"></script>
+</head>
+<body>
+
+<p>`dir=rtl` on a paragraph in the shadow tree, text in the light tree</p>
+<div id="host">
+اختبر.
+</div>
+<p id="result">The HTML direction / computed CSS `direction` value for the paragraph is: </p>
+
+<script type="text/javascript">
+  let root = host.attachShadow({mode:"open"});
+  root.innerHTML = `<style>p {width: 50%; border: 1px dotted;}</style><p dir="rtl"><slot></slot></p>`;
+  result.innerHTML += html_direction(root.querySelector('p')) + " / " + getComputedStyle(root.querySelector('p')).direction + '.';
+</script>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-29-ref.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-29-ref.html
new file mode 100644
index 00000000000..4b949acb098
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-29-ref.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=auto on a paragraph in the shadow tree, text in the light tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+div p {width: 50%; border: 1px dotted;}
+</style>
+</head>
+<body>
+
+<p>`dir=auto` on a paragraph in the shadow tree, text in the light tree</p>
+<div id="host">
+<p dir="ltr">para.</p>
+</div>
+<p id="result">The HTML direction / computed CSS `direction` value for the paragraph is: ltr / ltr.</p>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-29.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-29.html
new file mode 100644
index 00000000000..46cbf8d2911
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-29.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=auto on a paragraph in the shadow tree, text in the light tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<link rel="match" href="dir-shadow-29-ref.html">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+</style>
+<script src="dir-shadow-utils.js"></script>
+</head>
+<body>
+
+<p>`dir=auto` on a paragraph in the shadow tree, text in the light tree</p>
+<div id="host">
+para.
+</div>
+<p id="result">The HTML direction / computed CSS `direction` value for the paragraph is: </p>
+
+<script type="text/javascript">
+  let root = host.attachShadow({mode:"open"});
+  root.innerHTML = `<style>p {width: 50%; border: 1px dotted;}</style><p dir="auto"><slot></slot></p>`;
+  result.innerHTML += html_direction(root.querySelector('p')) + " / " + getComputedStyle(root.querySelector('p')).direction + '.';
+</script>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-30-ref.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-30-ref.html
new file mode 100644
index 00000000000..be2cc44abd5
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-30-ref.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=auto on a paragraph in the shadow tree, text in the light tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+div p {width: 50%; border: 1px dotted;}
+</style>
+</head>
+<body>
+
+<p>`dir=auto` on a paragraph in the shadow tree, text in the light tree</p>
+<div id="host">
+<p dir="ltr">اختبر.</p>
+</div>
+<p id="result">The HTML direction / computed CSS `direction` value for the paragraph is: ltr / ltr.</p>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-30.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-30.html
new file mode 100644
index 00000000000..2a3e56e62cc
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-30.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=auto on a paragraph in the shadow tree, text in the light tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<link rel="match" href="dir-shadow-30-ref.html">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em;}
+</style>
+<script src="dir-shadow-utils.js"></script>
+</head>
+<body>
+
+<p>`dir=auto` on a paragraph in the shadow tree, text in the light tree</p>
+<div id="host">
+اختبر.
+</div>
+<p id="result">The HTML direction / computed CSS `direction` value for the paragraph is: </p>
+
+<script type="text/javascript">
+  let root = host.attachShadow({mode:"open"});
+  root.innerHTML = `<style>p {width: 50%; border: 1px dotted;}</style><p dir="auto"><slot></slot></p>`;
+  result.innerHTML += html_direction(root.querySelector('p')) + " / " + getComputedStyle(root.querySelector('p')).direction + '.';
+</script>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-31-ref.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-31-ref.html
new file mode 100644
index 00000000000..1c5b5b11a8c
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-31-ref.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=rtl on the slot, span in the light tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em; padding: 0.25em;}
+span {border: 1px solid silver;}
+</style>
+</head>
+<body>
+
+<p>`dir=rtl` on the slot, span in the light tree</p>
+<div id="host" dir="ltr"><span dir="rtl" style="unicode-bidi: normal">RTL.</span></div>
+<p id="result">The HTML direction / computed CSS `direction` value for the span is: ltr / rtl.</p>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-31.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-31.html
new file mode 100644
index 00000000000..d48a0f8c040
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-31.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=rtl on the slot, span in the light tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<link rel="match" href="dir-shadow-31-ref.html">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em; padding: 0.25em;}
+span {border: 1px solid silver;}
+
+</style>
+<script src="dir-shadow-utils.js"></script>
+</head>
+<body>
+
+<p>`dir=rtl` on the slot, span in the light tree</p>
+<div id="host" dir="ltr"><span>RTL.</span></div>
+<p id="result">The HTML direction / computed CSS `direction` value for the span is: </p>
+
+<script type="text/javascript">
+  let root = host.attachShadow({mode:"open"});
+  root.innerHTML = `<slot dir="rtl"></slot>`;
+  result.innerHTML += html_direction(host.querySelector('span')) + " / " + getComputedStyle(host.querySelector('span')).direction + '.';
+</script>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-32-ref.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-32-ref.html
new file mode 100644
index 00000000000..6e5d9a96e8e
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-32-ref.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=rtl on the shadow host, span in the shadow tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em; padding: 0.25em;}
+span {border: 1px solid silver;}
+</style>
+</head>
+<body>
+
+<p>`dir=rtl` on the shadow host, span in the shadow tree</p>
+<div id="host" dir="rtl"><span>RTL.</span></div>
+<p id="result">The HTML direction / computed CSS `direction` value for the shadow span is: rtl / rtl.</p>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-32.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-32.html
new file mode 100644
index 00000000000..ac9c9e45792
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-32.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=rtl on the shadow host, span in the shadow tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<link rel="match" href="dir-shadow-32-ref.html">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em; padding: 0.25em;}
+</style>
+<script src="dir-shadow-utils.js"></script>
+</head>
+<body>
+
+<p>`dir=rtl` on the shadow host, span in the shadow tree</p>
+<div id="host" dir="rtl"></div>
+<p id="result">The HTML direction / computed CSS `direction` value for the shadow span is: </p>
+
+<script type="text/javascript">
+  let root = host.attachShadow({mode:"open"});
+  root.innerHTML = `<style>span {border: 1px solid silver;}</style><span>RTL.</span>`;
+  result.innerHTML += html_direction(root.querySelector('span')) + " / " + getComputedStyle(root.querySelector('span')).direction + '.';
+</script>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-33-ref.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-33-ref.html
new file mode 100644
index 00000000000..cdf89d78bb6
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-33-ref.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=auto on the span (shadow host), text in the shadow tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em; padding: 0.25em;}
+span {border: 1px solid silver;}
+</style>
+</head>
+<body>
+
+<p>`dir=auto` on the span (shadow host), text in the shadow tree</p>
+<span id="host" dir="ltr">اختبر.</span>
+<p id="result">The HTML direction / computed CSS `direction` value for the shadow host is: ltr / ltr.</p>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-33.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-33.html
new file mode 100644
index 00000000000..814e3b34d6f
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-33.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=auto on the span (shadow host), text in the shadow tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<link rel="match" href="dir-shadow-33-ref.html">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em; padding: 0.25em;}
+span {border: 1px solid silver;}
+
+</style>
+<script src="dir-shadow-utils.js"></script>
+</head>
+<body>
+
+<p>`dir=auto` on the span (shadow host), text in the shadow tree</p>
+<span id="host" dir="auto"></span>
+<p id="result">The HTML direction / computed CSS `direction` value for the shadow host is: </p>
+
+<script type="text/javascript">
+  let root = host.attachShadow({mode:"open"});
+  root.innerHTML = `اختبر.`;
+  result.innerHTML += html_direction(host) + " / " + getComputedStyle(host).direction + '.';
+</script>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-34-ref.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-34-ref.html
new file mode 100644
index 00000000000..4cedca8e50d
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-34-ref.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=auto on a span in the shadow tree, text in the light tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em; padding: 0.25em;}
+</style>
+</head>
+<body>
+
+<p>`dir=auto` on a span in the shadow tree, text in the light tree</p>
+<div id="host"><span dir="ltr">اختبر.</span></div>
+<p id="result">The HTML direction / computed CSS `direction` value for the shadow span is: ltr / ltr.</p>
+
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-34.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-34.html
new file mode 100644
index 00000000000..07f75d216a8
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-34.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=auto on a span in the shadow tree, text in the light tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<link rel="match" href="dir-shadow-34-ref.html">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em; padding: 0.25em;}
+span {border: 1px solid silver;}
+
+</style>
+<script src="dir-shadow-utils.js"></script>
+</head>
+<body>
+
+<p>`dir=auto` on a span in the shadow tree, text in the light tree</p>
+<div id="host">اختبر.</div>
+<p id="result">The HTML direction / computed CSS `direction` value for the shadow span is: </p>
+
+<script type="text/javascript">
+  let root = host.attachShadow({mode:"open"});
+  root.innerHTML = `<span dir="auto"><slot></slot></span>`;
+  result.innerHTML += html_direction(root.querySelector("span")) + " / " + getComputedStyle(root.querySelector("span")).direction + '.';
+</script>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-35-ref.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-35-ref.html
new file mode 100644
index 00000000000..c4e9f8c70eb
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-35-ref.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=ltr on a div in the shadow tree, text in the light tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<style type="text/css">
+body {width: 600px;}
+div#host {border: 1px solid gray; margin: 1em; padding: 0.25em;}
+span {border: 1px solid silver;}
+</style>
+</head>
+<body>
+
+<p>`dir=ltr` on a div in the shadow tree, text in the light tree</p>
+<div id="host" dir="rtl"><div dir="ltr"><span>اختبر.</span></div></div>
+<p id="result">The HTML direction / computed CSS `direction` value for the span is: rtl / ltr.</p>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-35.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-35.html
new file mode 100644
index 00000000000..0f2a7c882f8
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-35.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=ltr on a div in the shadow tree, text in the light tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<link rel="match" href="dir-shadow-35-ref.html">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em; padding: 0.25em;}
+span {border: 1px solid silver;}
+
+</style>
+<script src="dir-shadow-utils.js"></script>
+</head>
+<body>
+
+<p>`dir=ltr` on a div in the shadow tree, text in the light tree</p>
+<div id="host" dir="rtl"><span>اختبر.</span></div>
+<p id="result">The HTML direction / computed CSS `direction` value for the span is: </p>
+
+<script type="text/javascript">
+  let root = host.attachShadow({mode:"open"});
+  root.innerHTML = `<div dir="ltr"><slot></slot></div>`;
+  result.innerHTML += html_direction(root.querySelector("div").firstChild) + " / " + getComputedStyle(root.querySelector("div").firstChild).direction + '.';
+</script>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-36-ref.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-36-ref.html
new file mode 100644
index 00000000000..f8af117e3bf
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-36-ref.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=auto and text in a slot in the shadow tree, text in the light tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em; padding: 0.25em;}
+span {border: 1px solid silver;}
+</style>
+</head>
+<body>
+
+<p>`dir=auto` and text in a slot in the shadow tree, text in the light tree</p>
+<div id="host">English.</div>
+<p id="result">The HTML direction / computed CSS `direction` value for the light tree text is: ltr / ltr (on the slot) and ltr / ltr (on the host).</p>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-36.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-36.html
new file mode 100644
index 00000000000..ff4f11b3a6f
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-36.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=auto and text in a slot in the shadow tree, text in the light tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<link rel="match" href="dir-shadow-36-ref.html">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em; padding: 0.25em;}
+span {border: 1px solid silver;}
+
+</style>
+<script src="dir-shadow-utils.js"></script>
+</head>
+<body>
+
+<p>`dir=auto` and text in a slot in the shadow tree, text in the light tree</p>
+<div id="host">English.</div>
+<p id="result">The HTML direction / computed CSS `direction` value for the light tree text is: </p>
+
+<script type="text/javascript">
+  let root = host.attachShadow({mode:"open"});
+  root.innerHTML = `<slot dir=auto>اختبر</slot>`;
+  result.innerHTML += html_direction(root.firstChild) + " / " + getComputedStyle(root.firstChild).direction + " (on the " +  root.firstChild.localName + ') and ' + html_direction(host) + " / " + getComputedStyle(host).direction + ' (on the ' + host.id + ').';
+</script>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-37-ref.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-37-ref.html
new file mode 100644
index 00000000000..5941b23c02a
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-37-ref.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=auto and text in a div in the shadow tree, text in the light tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em; padding: 0.25em;}
+span {border: 1px solid silver;}
+</style>
+</head>
+<body>
+
+<p>`dir=auto` and text in a div in the shadow tree, text in the light tree</p>
+<div id="host" dir="rtl">اختبر.123 456.</div>
+<p id="result">The HTML direction / computed CSS `direction` value for the light tree text is: rtl / rtl (on the div) and ltr / ltr (on the host).</p>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-37.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-37.html
new file mode 100644
index 00000000000..ba0480636a0
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-37.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=auto and text in a div in the shadow tree, text in the light tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<link rel="match" href="dir-shadow-37-ref.html">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em; padding: 0.25em;}
+span {border: 1px solid silver;}
+
+</style>
+<script src="dir-shadow-utils.js"></script>
+</head>
+<body>
+
+<p>`dir=auto` and text in a div in the shadow tree, text in the light tree</p>
+<div id="host">123 456.</div>
+<p id="result">The HTML direction / computed CSS `direction` value for the light tree text is: </p>
+
+<script type="text/javascript">
+  let root = host.attachShadow({mode:"open"});
+  root.innerHTML = `<div dir="auto">اختبر.<slot></slot></div>`;
+  result.innerHTML += html_direction(root.firstChild) + " / " + getComputedStyle(root.firstChild).direction + " (on the " +  root.firstChild.localName + ') and ' + html_direction(host) + " / " + getComputedStyle(host).direction + ' (on the ' + host.id + ').';
+</script>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-38-ref.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-38-ref.html
new file mode 100644
index 00000000000..f8af117e3bf
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-38-ref.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=auto and text in a slot in the shadow tree, text in the light tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em; padding: 0.25em;}
+span {border: 1px solid silver;}
+</style>
+</head>
+<body>
+
+<p>`dir=auto` and text in a slot in the shadow tree, text in the light tree</p>
+<div id="host">English.</div>
+<p id="result">The HTML direction / computed CSS `direction` value for the light tree text is: ltr / ltr (on the slot) and ltr / ltr (on the host).</p>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-38.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-38.html
new file mode 100644
index 00000000000..e8f25eb5689
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-38.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=auto and text in a slot in the shadow tree, text in the light tree</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<link rel="match" href="dir-shadow-38-ref.html">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em; padding: 0.25em;}
+span {border: 1px solid silver;}
+
+</style>
+<script src="dir-shadow-utils.js"></script>
+</head>
+<body>
+
+<p>`dir=auto` and text in a slot in the shadow tree, text in the light tree</p>
+<div id="host">English.</div>
+<p id="result">The HTML direction / computed CSS `direction` value for the light tree text is: </p>
+
+<script type="text/javascript">
+  let root = host.attachShadow({mode:"open"});
+  root.innerHTML = `<slot dir=auto>اختبر.</slot>`;
+  result.innerHTML += html_direction(root.firstChild) + " / " + getComputedStyle(root.firstChild).direction + " (on the " +  root.firstChild.localName + ') and ' + html_direction(host) + " / " + getComputedStyle(host).direction + ' (on the ' + host.id + ').';
+</script>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-39-ref.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-39-ref.html
new file mode 100644
index 00000000000..8f75e9877c4
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-39-ref.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: text in the light tree, slotted node</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em; padding: 0.25em;}
+span {border: 1px solid silver;}
+
+</style>
+</head>
+<body>
+
+<p>text in the light tree, slotted node</p>
+<div id="host">slotted text.</div>
+<p id="result">The HTML direction / computed CSS `direction` value for the defaultContent when there is a slotted node: ltr / ltr (on the div).</p>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-39.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-39.html
new file mode 100644
index 00000000000..72fdd665fc3
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-39.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: text in the light tree, slotted node</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<link rel="match" href="dir-shadow-39-ref.html">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em; padding: 0.25em;}
+span {border: 1px solid silver;}
+
+</style>
+<script src="dir-shadow-utils.js"></script>
+</head>
+<body>
+
+<p>text in the light tree, slotted node</p>
+<div id="host">slotted text.</div>
+<p id="result">The HTML direction / computed CSS `direction` value for the defaultContent when there is a slotted node: </p>
+
+<script type="text/javascript">
+  let root = host.attachShadow({mode:"open"});
+  root.innerHTML = `<slot dir=auto><div>&#1571;&#1582;&#1576;&#1575;&#1585;</div>.</slot>`;
+  result.innerHTML += html_direction(root.firstChild.firstChild) + " / " + getComputedStyle(root.firstChild.firstChild).direction + " (on the " +  root.firstChild.firstChild.localName + ').';
+</script>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-40-ref.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-40-ref.html
new file mode 100644
index 00000000000..c1c074812b5
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-40-ref.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: text in the light tree, no slotted node</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em; padding: 0.25em;}
+span {border: 1px solid silver;}
+</style>
+</head>
+<body>
+
+<p>text in the light tree, no slotted node</p>
+<div id="host" dir="rtl">&#1571;&#1582;&#1576;&#1575;&#1585;.</div>
+<p id="result">The HTML direction / computed CSS `direction` value for the defaultContent when there is not a slotted node: rtl / rtl (on the div).</p>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-40.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-40.html
new file mode 100644
index 00000000000..567f4fa9da8
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-40.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: text in the light tree, no slotted node</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<link rel="match" href="dir-shadow-40-ref.html">
+<style type="text/css">
+body {width: 600px;}
+div {border: 1px solid gray; margin: 1em; padding: 0.25em;}
+span {border: 1px solid silver;}
+
+</style>
+<script src="dir-shadow-utils.js"></script>
+</head>
+<body>
+
+<p>text in the light tree, no slotted node</p>
+<div id="host"></div>
+<p id="result">The HTML direction / computed CSS `direction` value for the defaultContent when there is not a slotted node: </p>
+
+<script type="text/javascript">
+  let root = host.attachShadow({mode:"open"});
+  root.innerHTML = `<slot dir=auto><div>&#1571;&#1582;&#1576;&#1575;&#1585;.</div></slot>`;
+  result.innerHTML += html_direction(root.firstChild.firstChild) + " / " + getComputedStyle(root.firstChild.firstChild).direction + " (on the " +  root.firstChild.firstChild.localName + ').';
+</script>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-41-ref.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-41-ref.html
new file mode 100644
index 00000000000..41f9c8bc31c
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-41-ref.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=ltr on a div in the shadow tree, dir=rtl on the shadow host, no slotted text in the light or dark trees</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<style type="text/css">
+body {width: 600px;}
+#host {border: 1px solid gray; margin: 1em; padding: 0.25em;}
+span {border: 1px solid silver;}
+
+</style>
+</head>
+<body>
+
+<p>`dir=ltr` on a div in the shadow tree, `dir=rtl` on the shadow host, no slotted text in the light or dark trees</p>
+<div id="host" dir="rtl"><div dir="ltr"><span dir="rtl"></span></div></div>
+<p id="result">The HTML direction / computed CSS `direction` value is: rtl / rtl (on the slot).</p>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-41.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-41.html
new file mode 100644
index 00000000000..48e2057552c
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-41.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8"/>
+<title>[dir] and shadow slots: dir=ltr on a div in the shadow tree, dir=rtl on the shadow host, no slotted text in the light or dark trees</title>
+<link rel="author" title="Eric Meyer" href="mailto:emeyer@igalia.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/C#the-dir-attribute">
+<link rel="help" href="https://github.com/whatwg/html/issues/3699">
+<link rel="help" href="https://github.com/whatwg/html/pull/9796">
+<link rel="match" href="dir-shadow-41-ref.html">
+<style type="text/css">
+body {width: 600px;}
+#host {border: 1px solid gray; margin: 1em; padding: 0.25em;}
+span {border: 1px solid silver;}
+
+</style>
+<script src="dir-shadow-utils.js"></script>
+</head>
+<body>
+
+<p>`dir=ltr` on a div in the shadow tree, `dir=rtl` on the shadow host, no slotted text in the light or dark trees</p>
+<div id="host" dir="rtl"><span slot="x1"></span></div>
+<p id="result">The HTML direction / computed CSS `direction` value is: </p>
+
+<script type="text/javascript">
+  let root = host.attachShadow({mode:"open"});
+  root.innerHTML = `<div dir="ltr"><slot dir="auto" name="x1"></slot></div>`;
+  result.innerHTML += html_direction(root.querySelector("div[dir=ltr]").firstChild) + " / " + getComputedStyle(root.querySelector("div[dir=ltr]").firstChild).direction + " (on the " +  root.querySelector("div[dir=ltr]").firstChild.localName + ').';
+</script>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-utils.js b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-utils.js
new file mode 100644
index 00000000000..c7d89cf9082
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-shadow-utils.js
@@ -0,0 +1,8 @@
+function html_direction(element) {
+  let is_ltr = element.matches(":dir(ltr)");
+  let is_rtl = element.matches(":dir(rtl)");
+  if (is_ltr == is_rtl) {
+    return "error";
+  }
+  return is_ltr ? "ltr" : "rtl";
+}
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/lang-attribute-shadow.window.js b/tests/wpt/tests/html/dom/elements/global-attributes/lang-attribute-shadow.window.js
new file mode 100644
index 00000000000..9ed242df169
--- /dev/null
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/lang-attribute-shadow.window.js
@@ -0,0 +1,81 @@
+const TESTS = [
+  {
+    title: "lang only on slot",
+    light_tree: `
+      <div id="host" data-expected="en-US"><span data-expected="en-US"></span></div>
+    `,
+    shadow_tree: `
+      <slot lang="en-AU" data-expected="en-AU"></slot>
+    `,
+  },
+  {
+    title: "lang only on host",
+    light_tree: `
+      <div id="host" lang="en-AU" data-expected="en-AU"><span data-expected="en-AU"></span></div>
+    `,
+    shadow_tree: `
+      <slot data-expected="en-AU"></slot>
+    `,
+  },
+  {
+    title: "lang on host and slot",
+    light_tree: `
+      <div id="host" lang="en-AU" data-expected="en-AU"><span data-expected="en-AU"></span></div>
+    `,
+    shadow_tree: `
+      <slot lang="en-GB" data-expected="en-GB"></slot>
+    `,
+  },
+  {
+    title: "lang on host and slotted element",
+    light_tree: `
+      <div id="host" lang="en-AU" data-expected="en-AU"><span lang="en-GB" data-expected="en-GB"></span></div>
+    `,
+    shadow_tree: `
+      <slot data-expected="en-AU"></slot>
+    `,
+  },
+  {
+    title: "lang on host and slot and slotted element",
+    light_tree: `
+      <div id="host" lang="en-AU" data-expected="en-AU"><span lang="en-GB" data-expected="en-GB"></span></div>
+    `,
+    shadow_tree: `
+      <slot lang="en-NZ" data-expected="en-NZ"></slot>
+    `,
+  },
+  {
+    title: "lang on slot inherits from shadow host",
+    light_tree: `
+      <div id="host" lang="en-GB" data-expected="en-GB"><span lang="en-US" data-expected="en-US"></span></div>
+    `,
+    shadow_tree: `
+      <div lang="en-CA" data-expected="en-CA">
+        <slot data-expected="en-GB"></slot>
+      </div>
+    `,
+  },
+];
+
+const container = document.createElement("div");
+document.body.append(container);
+container.lang = "en-US";
+
+for (const obj of TESTS) {
+  test(() => {
+    container.innerHTML = obj.light_tree;
+    let shadow = container.querySelector("#host").attachShadow({mode: "open"});
+    shadow.innerHTML = obj.shadow_tree;
+    for (const element of Array.from(container.querySelectorAll("[data-expected]")).concat(Array.from(shadow.querySelectorAll("[data-expected]")))) {
+      const expected = element.getAttribute("data-expected");
+      assert_true(element.matches(`:lang(${expected})`), `element matches expected language ${expected}`);
+      for (const other_lang of ["en-US", "en-AU", "en-GB", "en-NZ", "en-CA"]) {
+        if (expected != other_lang) {
+          assert_false(element.matches(`:lang(${other_lang})`), `element does not match language ${other_lang}`);
+        }
+      }
+    }
+  }, obj.title);
+}
+
+container.remove();
diff --git a/tests/wpt/tests/html/infrastructure/urls/base-url/document-base-url-changes-about-srcdoc-2.https.html b/tests/wpt/tests/html/infrastructure/urls/base-url/document-base-url-changes-about-srcdoc-2.https.html
index eac1eaf7d0a..14e712ce254 100644
--- a/tests/wpt/tests/html/infrastructure/urls/base-url/document-base-url-changes-about-srcdoc-2.https.html
+++ b/tests/wpt/tests/html/infrastructure/urls/base-url/document-base-url-changes-about-srcdoc-2.https.html
@@ -10,25 +10,19 @@ setup({ explicit_done: true });
 
 window.start = childDocument => {
   const grandchildDocument =
-    childDocument.querySelector('iframe').contentDocument;
+    childDocument.getElementById('foo').contentDocument;
 
   test(t => {
-    // Clean up the iframe so that the dangling document.open() doesn't cause a
-    // harness timeout.
-    t.add_cleanup(() => {
-      document.querySelector('iframe').remove();
-    });
-
-    assert_equals(childDocument.URL, 'about:srcdoc',
+    assert_equals(childDocument.URL, 'about:blank',
       'Child document starting URL');
-    assert_equals(grandchildDocument.URL, 'about:blank',
+    assert_equals(grandchildDocument.URL, 'about:srcdoc',
       'Grandchild document starting URL');
     const originalChildBaseURL = childDocument.baseURI;
 
     grandchildDocument.open("", "");
     // Verify that the document.open() trick worked: the grandchild should now
     // have the same url as the child, and have inherited the child's base url.
-    assert_equals(grandchildDocument.URL, 'about:srcdoc',
+    assert_equals(grandchildDocument.URL, 'about:blank',
       'Grandchild document after document.open() trick');
     assert_equals(grandchildDocument.baseURI, originalChildBaseURL,
       'Grandchild base URL must match child base URL');
@@ -41,7 +35,7 @@ window.start = childDocument => {
     // Verify that changing the child's base url succeeded and did not affect
     // the grandchild's base url.
     const newChildBaseURL = childDocument.baseURI;
-    assert_equals(grandchildDocument.URL, 'about:srcdoc',
+    assert_equals(grandchildDocument.URL, 'about:blank',
       'Grandchild document after child gets new base URL');
     assert_not_equals(newChildBaseURL, originalChildBaseURL,
       'Child base URL must change');
@@ -53,5 +47,25 @@ window.start = childDocument => {
 };
 </script>
 
-<iframe srcdoc="<iframe></iframe><script>parent.start(document)</script>">
-</iframe>
+<iframe src='about:blank'></iframe>
+
+<script>
+  window.onload = () => {
+    let subframe_doc = document.querySelector('iframe').contentDocument;
+    subframe_doc.body.innerHTML = '<iframe srcdoc="foo" id="foo"></iframe>';
+    promise_test((test) => {
+      return new Promise(async resolve => {
+      // We need a timeout since the srcdoc frame takes time to setup and
+      // doesn't fire a loadstop.
+      test.step_timeout(resolve, 100);
+      }).then(() => {
+        assert_equals(
+            subframe_doc.getElementById('foo').contentDocument.URL,
+            'about:srcdoc');
+        let script = subframe_doc.createElement('script');
+        script.innerHTML = 'parent.start(document);';
+        subframe_doc.body.appendChild(script);
+      });
+    }, "wrapper promise test for timeout.");
+  };
+</script>
diff --git a/tests/wpt/tests/html/rendering/the-details-element/details-display-type-002-ref.html b/tests/wpt/tests/html/rendering/the-details-element/details-display-type-002-ref.html
new file mode 100644
index 00000000000..297634b521f
--- /dev/null
+++ b/tests/wpt/tests/html/rendering/the-details-element/details-display-type-002-ref.html
@@ -0,0 +1,10 @@
+<!doctype html>
+<style>
+  div {
+    margin-top: 3em;
+  }
+</style>
+<details open>
+  <summary>The summary.</summary>
+  <div>Some details.</div>
+</details>
diff --git a/tests/wpt/tests/html/rendering/the-details-element/details-display-type-002.tentative.html b/tests/wpt/tests/html/rendering/the-details-element/details-display-type-002.tentative.html
new file mode 100644
index 00000000000..716221f7c5c
--- /dev/null
+++ b/tests/wpt/tests/html/rendering/the-details-element/details-display-type-002.tentative.html
@@ -0,0 +1,17 @@
+<!DOCTYPE HTML>
+<meta charset="utf-8">
+<title>Details display property (flex)</title>
+<link rel="match" href="details-display-type-002-ref.html">
+<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1856374">
+<link rel="help" href="https://github.com/dbaron/details-styling">
+<style>
+  details {
+    display: flex;
+    flex-direction: column;
+    gap: 3em;
+  }
+</style>
+<details open>
+  <summary>The summary.</summary>
+  Some details.
+</details>
diff --git a/tests/wpt/tests/html/rendering/widgets/form-sizing-input-number.tentative.html b/tests/wpt/tests/html/rendering/widgets/form-sizing-input-number.tentative.html
index 59835805a07..0bf64c181d0 100644
--- a/tests/wpt/tests/html/rendering/widgets/form-sizing-input-number.tentative.html
+++ b/tests/wpt/tests/html/rendering/widgets/form-sizing-input-number.tentative.html
@@ -4,7 +4,7 @@
 <script src="/resources/testharnessreport.js"></script>
 <style>
 .disable-default {
-  form-sizing: normal;
+  form-sizing: content;
 }
 
 .small-placeholder {
@@ -51,7 +51,7 @@ function addTwoElements(source1, source2) {
   test(() => {
     let pair = addElements(`<input type=${type}>`);
     // A text <input> has approximately 20ch width by default.
-    // A text <input> with form-sizing:normal must be shorter than the default.
+    // A text <input> with form-sizing:content must be shorter than the default.
     assert_less_than(pair.content.offsetWidth, pair.fixed.offsetWidth);
     assert_equals(pair.content.offsetHeight, pair.fixed.offsetHeight);
 
diff --git a/tests/wpt/tests/html/rendering/widgets/form-sizing-input-text.tentative.html b/tests/wpt/tests/html/rendering/widgets/form-sizing-input-text.tentative.html
index 32cabc557f6..065994471f0 100644
--- a/tests/wpt/tests/html/rendering/widgets/form-sizing-input-text.tentative.html
+++ b/tests/wpt/tests/html/rendering/widgets/form-sizing-input-text.tentative.html
@@ -4,7 +4,7 @@
 <script src="/resources/testharnessreport.js"></script>
 <style>
 .disable-default {
-  form-sizing: normal;
+  form-sizing: content;
 }
 
 .small-placeholder {
@@ -50,7 +50,7 @@ function addTwoElements(source1, source2) {
   test(() => {
     let pair = addElements(`<input type=${type}>`);
     // A text <input> has approximately 20ch width by default.
-    // A text <input> with form-sizing:normal must be shorter than the default.
+    // A text <input> with form-sizing:content must be shorter than the default.
     assert_less_than(pair.content.offsetWidth, pair.fixed.offsetWidth);
     assert_equals(pair.content.offsetHeight, pair.fixed.offsetHeight);
 
diff --git a/tests/wpt/tests/html/rendering/widgets/form-sizing-select.tentative.html b/tests/wpt/tests/html/rendering/widgets/form-sizing-select.tentative.html
index f9efdc74f91..7ce6f03ff4b 100644
--- a/tests/wpt/tests/html/rendering/widgets/form-sizing-select.tentative.html
+++ b/tests/wpt/tests/html/rendering/widgets/form-sizing-select.tentative.html
@@ -5,7 +5,7 @@
 <body>
 <style>
 .disable-default {
-  form-sizing: normal;
+  form-sizing: content;
 }
 </style>
 <div id="container"></div>
@@ -18,7 +18,7 @@ const DISABLE = 'class="disable-default"';
 test(() => {
   const s = '<select>><option>1<option>quick brown<option>fox</select>';
   container.innerHTML = s + s;
-  container.lastElementChild.style.formSizing = 'normal';
+  container.lastElementChild.style.formSizing = 'content';
   const widthForContent1 = container.lastElementChild.offsetWidth;
   assert_greater_than(container.firstElementChild.offsetWidth,
                       widthForContent1);
@@ -31,9 +31,9 @@ test(() => {
   container.innerHTML = '<select><option>foo<option>quick brown fox</select>';
   const select = container.firstElementChild;
   const initialWidth = select.offsetWidth;
-  select.style.formSizing = 'normal';
+  select.style.formSizing = 'content';
   assert_less_than(select.offsetWidth, initialWidth);
-  select.style.formSizing = 'auto';
+  select.style.formSizing = 'fixed';
   assert_equals(select.offsetWidth, initialWidth);
 }, 'dropdown: Change the form-sizing value dynamically');
 
@@ -76,9 +76,9 @@ if (container.firstElementChild.offsetHeight != container.lastElementChild.offse
     container.innerHTML = '<select multiple><option>foo<option>quick brown fox</select>';
     const select = container.firstElementChild;
     const initialHeight = select.offsetHeight;
-    select.style.formSizing = 'normal';
+    select.style.formSizing = 'content';
     assert_less_than(select.offsetHeight, initialHeight);
-    select.style.formSizing = 'auto';
+    select.style.formSizing = 'fixed';
     assert_equals(select.offsetHeight, initialHeight);
   }, 'listbox: Change the form-sizing value dynamically');
 
diff --git a/tests/wpt/tests/html/rendering/widgets/form-sizing-textarea.tentative.html b/tests/wpt/tests/html/rendering/widgets/form-sizing-textarea.tentative.html
index ae20e59290c..fb4ce762e32 100644
--- a/tests/wpt/tests/html/rendering/widgets/form-sizing-textarea.tentative.html
+++ b/tests/wpt/tests/html/rendering/widgets/form-sizing-textarea.tentative.html
@@ -4,7 +4,7 @@
 <script src="/resources/testharnessreport.js"></script>
 <style>
 .disable-default {
-  form-sizing: normal;
+  form-sizing: content;
 }
 
 .small-placeholder {
@@ -49,7 +49,7 @@ function addTwoElements(source1, source2) {
 test(() => {
   let pair = addElements('<textarea></textarea>');
   // Historically a <textarea> has approximately 20ch x 2lh size by default.
-  // A <textarea> with form-sizing:normal must be samller than the default.
+  // A <textarea> with form-sizing:content must be samller than the default.
   assert_less_than(pair.content.offsetWidth, pair.fixed.offsetWidth);
   assert_less_than(pair.content.offsetHeight, pair.fixed.offsetHeight);
 
diff --git a/tests/wpt/tests/html/semantics/embedded-content/media-elements/loading-the-media-resource/resource-selection-source-media-env-change.html b/tests/wpt/tests/html/semantics/embedded-content/media-elements/loading-the-media-resource/resource-selection-source-media-env-change.html
index 30d591ae6e7..67f2c8300d2 100644
--- a/tests/wpt/tests/html/semantics/embedded-content/media-elements/loading-the-media-resource/resource-selection-source-media-env-change.html
+++ b/tests/wpt/tests/html/semantics/embedded-content/media-elements/loading-the-media-resource/resource-selection-source-media-env-change.html
@@ -5,10 +5,20 @@
 <div id=log></div>
 <iframe src="resources/media-min-width.html" width="300"></iframe>
 <script>
+// promises for the iframed test to resolve
+let beforeEnvChange = new Promise((resolve, reject) => {
+  window[0].resolveBeforeEnvChange = resolve;
+});
+let afterEnvChange = new Promise((resolve, reject) => {
+  window[0].resolveAfterEnvChange = resolve;
+});
+let afterLoadCalled = new Promise((resolve, reject) => {
+  window[0].resolveAfterLoadCalled = resolve;
+});
 const t = promise_test(async () => {
-  await new Promise(resolve => window.onload = resolve);
-  assert_equals(window[0].beforeEnvChange, '#a', 'beforeEnvChange');
-  assert_equals(window[0].afterEnvChange, '#a', 'afterEnvChange');
-  assert_equals(window[0].afterLoadCalled, '#b', 'afterLoadCalled');
+  [beforeEnvChange, afterEnvChange, afterLoadCalled] = await Promise.all([ beforeEnvChange, afterEnvChange, afterLoadCalled ]);
+  assert_equals(beforeEnvChange, '#a', 'beforeEnvChange');
+  assert_equals(afterEnvChange, '#a', 'afterEnvChange');
+  assert_equals(afterLoadCalled, '#b', 'afterLoadCalled');
 });
 </script>
diff --git a/tests/wpt/tests/html/semantics/embedded-content/media-elements/loading-the-media-resource/resources/media-min-width.html b/tests/wpt/tests/html/semantics/embedded-content/media-elements/loading-the-media-resource/resources/media-min-width.html
index 7c309469024..8a4ad500cb1 100644
--- a/tests/wpt/tests/html/semantics/embedded-content/media-elements/loading-the-media-resource/resources/media-min-width.html
+++ b/tests/wpt/tests/html/semantics/embedded-content/media-elements/loading-the-media-resource/resources/media-min-width.html
@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<video></video>
+<video width="200"></video>
 <script>
 function createSource(src, media) {
   var source = document.createElement('source');
@@ -14,18 +14,18 @@ const hash = str => str.substr(str.lastIndexOf('#'));
 (async () => {
   const v = document.querySelector('video');
   v.getBoundingClientRect(); // force layout flush. ensure viewport dimensions are up-to-date
-  v.append(createSource('delayed-broken-video.py#a', '(min-width: 200px)'));
-  v.append(createSource('delayed-broken-video.py#b'));
+  v.append(createSource('/media-source/mp4/test.mp4#a', '(min-width: 200px)'));
+  v.append(createSource('/media-source/mp4/test.mp4#b'));
   await rAF();
   await rAF();
-  window.beforeEnvChange = hash(v.currentSrc);
+  window.resolveBeforeEnvChange(hash(v.currentSrc));
   window.frameElement.width = '150';
   await rAF();
   await rAF();
-  window.afterEnvChange = hash(v.currentSrc);
+  window.resolveAfterEnvChange(hash(v.currentSrc));
   v.load()
   await rAF();
   await rAF();
-  window.afterLoadCalled = hash(v.currentSrc);
+  window.resolveAfterLoadCalled(hash(v.currentSrc));
 })();
 </script>
diff --git a/tests/wpt/tests/html/semantics/embedded-content/the-img-element/image-compositing-change.html b/tests/wpt/tests/html/semantics/embedded-content/the-img-element/image-compositing-change.html
index 658c2ad39ea..d3e7ee41711 100644
--- a/tests/wpt/tests/html/semantics/embedded-content/the-img-element/image-compositing-change.html
+++ b/tests/wpt/tests/html/semantics/embedded-content/the-img-element/image-compositing-change.html
@@ -2,7 +2,7 @@
 <html class="reftest-wait">
 <title>Composited images correctly re-raster when the image and bounds change</title>
 <meta charset="utf-8">
-<meta name=fuzzy content="maxDifference=150;totalPixels=296">
+<meta name=fuzzy content="maxDifference=0-150;totalPixels=0-296">
 <link rel="match" href="image-compositing-change-ref.html"/>
 <link rel="help" href="https://html.spec.whatwg.org/multipage/#the-img-element">
 <style>
diff --git a/tests/wpt/tests/html/semantics/embedded-content/the-video-element/resize-during-playback.html b/tests/wpt/tests/html/semantics/embedded-content/the-video-element/resize-during-playback.html
index 1b057bbeac3..e1f35768bc4 100644
--- a/tests/wpt/tests/html/semantics/embedded-content/the-video-element/resize-during-playback.html
+++ b/tests/wpt/tests/html/semantics/embedded-content/the-video-element/resize-during-playback.html
@@ -14,12 +14,15 @@ for (const format of ['mp4', 'webm']) {
     const video = document.createElement('video');
     assert_implements_optional(video.canPlayType(`video/${format}`), `${format} supported`);
 
+    const eventWatcher = new EventWatcher(t, video, ['resize', 'playing', 'error', 'ended']);
+
     // Load the video and wait for initial resize event.
-    video.src = `/media/400x300-red-resize-200x150-green.${format}`;
     video.muted = true;
     video.preload = 'auto';
+    video.onerror = t.unreached_func("error during playback");
+    video.src = `/media/400x300-red-resize-200x150-green.${format}`;
     document.body.appendChild(video);
-    const eventWatcher = new EventWatcher(t, video, ['resize', 'playing', 'error', 'ended']);
+
     await eventWatcher.wait_for(['resize']);
     assert_equals(video.videoWidth, 400, 'width after first resize event');
     assert_equals(video.videoHeight, 300, 'height after first resize event');
diff --git a/tests/wpt/tests/html/semantics/forms/the-input-element/input-importNode-to-detached-document-crash.html b/tests/wpt/tests/html/semantics/forms/the-input-element/input-importNode-to-detached-document-crash.html
new file mode 100644
index 00000000000..5e0cff4fa30
--- /dev/null
+++ b/tests/wpt/tests/html/semantics/forms/the-input-element/input-importNode-to-detached-document-crash.html
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<body>
+<p>This test passes if it does not crash.</p>
+<input id="input" type="image" src="data:image/gif;base64,">
+<iframe id="iframe"></iframe>
+<script>
+let i_doc = iframe.contentDocument;
+iframe.remove();
+i_doc.importNode(input);
+</script>
+</body>
diff --git a/tests/wpt/tests/html/semantics/interactive-elements/the-details-element/name-attribute.tentative.html b/tests/wpt/tests/html/semantics/interactive-elements/the-details-element/name-attribute.html
similarity index 83%
rename from tests/wpt/tests/html/semantics/interactive-elements/the-details-element/name-attribute.tentative.html
rename to tests/wpt/tests/html/semantics/interactive-elements/the-details-element/name-attribute.html
index 6f45b3da089..2685546e9b0 100644
--- a/tests/wpt/tests/html/semantics/interactive-elements/the-details-element/name-attribute.tentative.html
+++ b/tests/wpt/tests/html/semantics/interactive-elements/the-details-element/name-attribute.html
@@ -153,8 +153,8 @@ promise_test(async t => {
   if (mutation_event_received_ids.length == 0) {
     // ok if mutation events are not supported
   } else {
-    assert_array_equals(mutation_event_received_ids, ["e0", "e1"],
-                        "removal event followed by addition event");
+    assert_array_equals(mutation_event_received_ids, ["e1"],
+                        "mutation events received only for open attribute mutation and not for closing other element");
   }
   assert_element_states(elements, [0, 1, 0, 0], "states after mutation");
   assert_array_equals(toggle_event_received_ids, [], "toggle events received before awaiting promises");
@@ -205,8 +205,8 @@ promise_test(async t => {
   assert_array_equals(received_ids, []);
   assert_element_states(elements, [1, 0, 0], "states before mutation");
   elements[1].open = true;
-  assert_array_equals(received_ids, ["e0", "e1"],
-                      "removal events received in tree order, followed by addition event, despite changes to name during mutation event");
+  assert_array_equals(received_ids, ["e1"],
+                      "mutation events received only for open attribute mutation and not for closing other element");
   assert_element_states(elements, [0, 1, 0], "states after mutation");
 }, "interaction of open attribute changes with mutation events");
 
@@ -336,14 +336,47 @@ promise_test(async t => {
                    document.getElementById("e1"),
                    document.getElementById("e2") ];
 
+  let mutation_received_ids = [];
+  let listener = event => {
+    mutation_received_ids.push(event.target.id);
+  };
+  for (let element of elements) {
+    element.addEventListener("DOMSubtreeModified", listener);
+  }
+
   assert_element_states(elements, [1, 0, 1], "states before first mutation");
+  assert_array_equals(mutation_received_ids, [], "mutation events received before first mutation");
   elements[2].name = "a";
   assert_element_states(elements, [1, 0, 0], "states after first mutation");
+  if (mutation_received_ids.length != 0) {
+    // OK to not support mutation events, or to send DOMSubtreeModified
+    // only for attribute addition/removal (open) but not for attribute
+    // change (name)
+    assert_array_equals(mutation_received_ids, ["e2"], "mutation events received after first mutation");
+  }
   elements[0].name = "c";
   elements[2].open = true;
   assert_element_states(elements, [1, 0, 1], "states before second mutation");
+  if (mutation_received_ids.length != 0) { // OK to not support mutation events
+    if (mutation_received_ids.length == 1) {
+      // OK to receive DOMSubtreeModified for attribute addition/removal
+      // (open) but not for attribute change (name)
+      assert_array_equals(mutation_received_ids, ["e2"], "mutation events received before second mutation");
+    } else {
+      assert_array_equals(mutation_received_ids, ["e2", "e0", "e2"], "mutation events received before second mutation");
+    }
+  }
   elements[0].name = "a";
   assert_element_states(elements, [0, 0, 1], "states after second mutation");
+  if (mutation_received_ids.length != 0) { // OK to not support mutation events
+    if (mutation_received_ids.length == 1) {
+      // OK to receive DOMSubtreeModified for attribute addition/removal
+      // (open) but not for attribute change (name)
+      assert_array_equals(mutation_received_ids, ["e2"], "mutation events received before second mutation");
+    } else {
+      assert_array_equals(mutation_received_ids, ["e2", "e0", "e2", "e0"], "mutation events received after second mutation");
+    }
+  }
 }, "handling of name attribute changes");
 
 promise_test(async t => {
@@ -392,28 +425,45 @@ promise_test(async t => {
     });
   };
 
+  let track_mutations = (element) => {
+    let result = { count: 0 };
+    let listener = event => {
+      ++result.count;
+    };
+    element.addEventListener("DOMSubtreeModified", listener);
+    return result;
+  }
+
   await expect_opening(watch_e0);
 
   // Test appending an open element in the group.
   let new1 = make_details();
+  let mutations1 = track_mutations(new1);
   let watch_new1 = new EventWatcher(t, new1, ['toggle']);
   new1.open = true;
+  assert_in_array(mutations1.count, [0, 1], "mutation events count before inserting new1");
   await expect_opening(watch_new1);
   container.appendChild(new1);
   await expect_closing(watch_new1);
+  assert_in_array(mutations1.count, [0, 1], "mutation events count after inserting new1");
 
   // Test appending a closed element in the group.
   let new2 = make_details();
+  let mutations2 = track_mutations(new2);
   let watch_new2 = new EventWatcher(t, new2, ['toggle']);
   container.appendChild(new2);
+  assert_equals(mutations2.count, 0, "mutation events count after inserting new2");
 
   // Test inserting an open element at the start of the group.
   let new3 = make_details();
+  let mutations3 = track_mutations(new3);
   new3.open = true; // this time do this before creating the EventWatcher
   let watch_new3 = new EventWatcher(t, new3, ['toggle']);
+  assert_in_array(mutations3.count, [0, 1], "mutation events count before inserting new3");
   await expect_opening(watch_new3);
   container.insertBefore(new3, elements[0]);
   await expect_closing(watch_new3);
+  assert_in_array(mutations3.count, [0, 1], "mutation events count after inserting new3");
 }, "handling of insertion of elements into group");
 
 </script>
diff --git a/tests/wpt/tests/html/semantics/interactive-elements/the-dialog-element/fixed-position-child-with-transformed-ancestor.html b/tests/wpt/tests/html/semantics/interactive-elements/the-dialog-element/fixed-position-child-with-transformed-ancestor.tentative.html
similarity index 100%
rename from tests/wpt/tests/html/semantics/interactive-elements/the-dialog-element/fixed-position-child-with-transformed-ancestor.html
rename to tests/wpt/tests/html/semantics/interactive-elements/the-dialog-element/fixed-position-child-with-transformed-ancestor.tentative.html
diff --git a/tests/wpt/tests/html/semantics/interactive-elements/the-dialog-element/fixed-position-child-with-will-change-ancestor.html b/tests/wpt/tests/html/semantics/interactive-elements/the-dialog-element/fixed-position-child-with-will-change-ancestor.tentative.html
similarity index 100%
rename from tests/wpt/tests/html/semantics/interactive-elements/the-dialog-element/fixed-position-child-with-will-change-ancestor.html
rename to tests/wpt/tests/html/semantics/interactive-elements/the-dialog-element/fixed-position-child-with-will-change-ancestor.tentative.html
diff --git a/tests/wpt/tests/html/semantics/interactive-elements/the-dialog-element/top-layer-stacking.html b/tests/wpt/tests/html/semantics/interactive-elements/the-dialog-element/top-layer-stacking.tentative.html
similarity index 100%
rename from tests/wpt/tests/html/semantics/interactive-elements/the-dialog-element/top-layer-stacking.html
rename to tests/wpt/tests/html/semantics/interactive-elements/the-dialog-element/top-layer-stacking.tentative.html
diff --git a/tests/wpt/tests/html/semantics/interfaces.js b/tests/wpt/tests/html/semantics/interfaces.js
index 96abf61e2ce..05fc82f7673 100644
--- a/tests/wpt/tests/html/semantics/interfaces.js
+++ b/tests/wpt/tests/html/semantics/interfaces.js
@@ -100,6 +100,7 @@ var elements = [
   ["output", "Output"],
   ["p", "Paragraph"],
   ["param", "Param"],
+  ["permission", "Permission"],
   ["picture", "Picture"],
   ["plaintext", ""],
   ["pre", "Pre"],
diff --git a/tests/wpt/tests/html/semantics/permission-element/no-end-tag-no-contents.html b/tests/wpt/tests/html/semantics/permission-element/no-end-tag-no-contents.html
new file mode 100644
index 00000000000..5fcce1421b6
--- /dev/null
+++ b/tests/wpt/tests/html/semantics/permission-element/no-end-tag-no-contents.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<body>
+<!--The permission element should have no end tag or content.
+    Therefore the parsing should stop after the beginning tag, and the following
+    element and text will become part of the 'body' element's contents.
+-->
+<permission type="geolocation"><span>this is some text</span></permission>
+
+<script>
+  test(function(){
+    assert_equals(3, document.body.childElementCount); // permission, span, script
+    assert_equals(document.body.innerText, "this is some text", "The text should be part of the 'body' element's text");
+
+    assert_true(document.body.children[0] instanceof HTMLPermissionElement, "First element should be a permission element");
+    var permission = document.body.children[0];
+    assert_equals(permission.innerText, "", "The permission element should have no text");
+    assert_equals(permission.childElementCount, 0, "The permission element should have no children");
+
+    assert_true(document.body.children[1] instanceof HTMLSpanElement, "Second element should be a span element");
+    var span = document.body.children[1];
+    assert_equals(span.innerText, "this is some text", "The span element should contain the text");
+  }, "The permission element should have no end tag or contents");
+</script>
+</body>
\ No newline at end of file
diff --git a/tests/wpt/tests/html/semantics/scripting-1/the-script-element/moving-between-documents/ordering/delay-load-event-1.html b/tests/wpt/tests/html/semantics/scripting-1/the-script-element/moving-between-documents/ordering/delay-load-event-1.html
index 5c8acd470eb..c5812765ebb 100644
--- a/tests/wpt/tests/html/semantics/scripting-1/the-script-element/moving-between-documents/ordering/delay-load-event-1.html
+++ b/tests/wpt/tests/html/semantics/scripting-1/the-script-element/moving-between-documents/ordering/delay-load-event-1.html
@@ -3,8 +3,10 @@
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script src="helper.js"></script>
+
 <body>
 <script>
 runDelayEventTest('Script elements (parser-blocking)');
 </script>
+
 <script id="to-be-moved" src="../../resources/throw.js?pipe=trickle(d3)"></script>
diff --git a/tests/wpt/tests/html/semantics/scripting-1/the-script-element/moving-between-documents/ordering/delay-load-event-2.html b/tests/wpt/tests/html/semantics/scripting-1/the-script-element/moving-between-documents/ordering/delay-load-event-2.html
index 3399a8c001f..916673894dc 100644
--- a/tests/wpt/tests/html/semantics/scripting-1/the-script-element/moving-between-documents/ordering/delay-load-event-2.html
+++ b/tests/wpt/tests/html/semantics/scripting-1/the-script-element/moving-between-documents/ordering/delay-load-event-2.html
@@ -3,6 +3,7 @@
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script src="helper.js"></script>
+
 <body>
 <script>
 runDelayEventTest('Script elements (async)');
diff --git a/tests/wpt/tests/html/semantics/scripting-1/the-script-element/moving-between-documents/ordering/delay-load-event-iframe.html b/tests/wpt/tests/html/semantics/scripting-1/the-script-element/moving-between-documents/ordering/delay-load-event-iframe.html
index 38a9a215419..efec7657c36 100644
--- a/tests/wpt/tests/html/semantics/scripting-1/the-script-element/moving-between-documents/ordering/delay-load-event-iframe.html
+++ b/tests/wpt/tests/html/semantics/scripting-1/the-script-element/moving-between-documents/ordering/delay-load-event-iframe.html
@@ -2,4 +2,3 @@
 <meta charset="utf-8">
 <body onload="parent.onloadIframe()">
 <script src="../../resources/throw.js?pipe=trickle(d2)"></script>
-</body>
diff --git a/tests/wpt/tests/html/semantics/scripting-1/the-script-element/moving-between-documents/ordering/helper.js b/tests/wpt/tests/html/semantics/scripting-1/the-script-element/moving-between-documents/ordering/helper.js
index 331cf79bf0b..cb5f45eb0d6 100644
--- a/tests/wpt/tests/html/semantics/scripting-1/the-script-element/moving-between-documents/ordering/helper.js
+++ b/tests/wpt/tests/html/semantics/scripting-1/the-script-element/moving-between-documents/ordering/helper.js
@@ -1,14 +1,14 @@
 function runDelayEventTest(description) {
-  const t = async_test(description +
+  const t_original = async_test(description +
       ' still delay the load event in the original Document after move');
   const t_new = async_test(description +
       ' does not delay the load event in the new Document after move');
-  const start_time = performance.now();
   const iframe = document.createElement('iframe');
   iframe.setAttribute('src', 'delay-load-event-iframe.html');
+  const start_time = performance.now();
   document.body.appendChild(iframe);
 
-  window.onload = t.step_func_done(() => {
+  window.onload = t_original.step_func_done(() => {
     // The `#to-be-moved` script should delay the load event until it is loaded
     // (i.e. 3 seconds), not just until it is moved out to another Document
     // (i.e. 1 second). Here we expect the delay should be at least 2 seconds,
@@ -20,11 +20,11 @@ function runDelayEventTest(description) {
   window.onloadIframe = t_new.step_func_done(() => {
     // The iframe's load event is fired after 2 seconds of its subresource
     // loading, and shouldn't wait for the `#to-be-moved` script.
-    assert_less_than(performance.now() - start_time, 2500,
+    assert_less_than(performance.now() - start_time, 3000,
         'Load event should not be delayed until moved script is loaded');
   });
 
-  t.step_timeout(() => {
+  t_original.step_timeout(() => {
     const script = document.querySelector('#to-be-moved');
     iframe.contentDocument.body.appendChild(script);
   }, 1000);
diff --git a/tests/wpt/tests/interfaces/WEBGL_clip_cull_distance.idl b/tests/wpt/tests/interfaces/WEBGL_clip_cull_distance.idl
index 46fa921fd53..a3a6dd869f9 100644
--- a/tests/wpt/tests/interfaces/WEBGL_clip_cull_distance.idl
+++ b/tests/wpt/tests/interfaces/WEBGL_clip_cull_distance.idl
@@ -1,7 +1,7 @@
 // GENERATED CONTENT - DO NOT EDIT
 // Content was automatically extracted by Reffy into webref
 // (https://github.com/w3c/webref)
-// Source: WebGL WEBGL_clip_cull_distance Extension Draft Specification (https://registry.khronos.org/webgl/extensions/WEBGL_clip_cull_distance/)
+// Source: WebGL WEBGL_clip_cull_distance Extension Specification (https://registry.khronos.org/webgl/extensions/WEBGL_clip_cull_distance/)
 
 [Exposed=(Window,Worker), LegacyNoInterfaceObject]
 interface WEBGL_clip_cull_distance {
diff --git a/tests/wpt/tests/interfaces/WEBGL_multi_draw.idl b/tests/wpt/tests/interfaces/WEBGL_multi_draw.idl
index ee8c044b529..fc2270029b1 100644
--- a/tests/wpt/tests/interfaces/WEBGL_multi_draw.idl
+++ b/tests/wpt/tests/interfaces/WEBGL_multi_draw.idl
@@ -7,26 +7,26 @@
 interface WEBGL_multi_draw {
   undefined multiDrawArraysWEBGL(
       GLenum mode,
-      ([AllowShared] Int32Array or sequence<GLint>) firstsList, GLuint firstsOffset,
-      ([AllowShared] Int32Array or sequence<GLsizei>) countsList, GLuint countsOffset,
+      ([AllowShared] Int32Array or sequence<GLint>) firstsList, unsigned long long firstsOffset,
+      ([AllowShared] Int32Array or sequence<GLsizei>) countsList, unsigned long long countsOffset,
       GLsizei drawcount);
   undefined multiDrawElementsWEBGL(
       GLenum mode,
-      ([AllowShared] Int32Array or sequence<GLsizei>) countsList, GLuint countsOffset,
+      ([AllowShared] Int32Array or sequence<GLsizei>) countsList, unsigned long long countsOffset,
       GLenum type,
-      ([AllowShared] Int32Array or sequence<GLsizei>) offsetsList, GLuint offsetsOffset,
+      ([AllowShared] Int32Array or sequence<GLsizei>) offsetsList, unsigned long long offsetsOffset,
       GLsizei drawcount);
   undefined multiDrawArraysInstancedWEBGL(
       GLenum mode,
-      ([AllowShared] Int32Array or sequence<GLint>) firstsList, GLuint firstsOffset,
-      ([AllowShared] Int32Array or sequence<GLsizei>) countsList, GLuint countsOffset,
-      ([AllowShared] Int32Array or sequence<GLsizei>) instanceCountsList, GLuint instanceCountsOffset,
+      ([AllowShared] Int32Array or sequence<GLint>) firstsList, unsigned long long firstsOffset,
+      ([AllowShared] Int32Array or sequence<GLsizei>) countsList, unsigned long long countsOffset,
+      ([AllowShared] Int32Array or sequence<GLsizei>) instanceCountsList, unsigned long long instanceCountsOffset,
       GLsizei drawcount);
   undefined multiDrawElementsInstancedWEBGL(
       GLenum mode,
-      ([AllowShared] Int32Array or sequence<GLsizei>) countsList, GLuint countsOffset,
+      ([AllowShared] Int32Array or sequence<GLsizei>) countsList, unsigned long long countsOffset,
       GLenum type,
-      ([AllowShared] Int32Array or sequence<GLsizei>) offsetsList, GLuint offsetsOffset,
-      ([AllowShared] Int32Array or sequence<GLsizei>) instanceCountsList, GLuint instanceCountsOffset,
+      ([AllowShared] Int32Array or sequence<GLsizei>) offsetsList, unsigned long long offsetsOffset,
+      ([AllowShared] Int32Array or sequence<GLsizei>) instanceCountsList, unsigned long long instanceCountsOffset,
       GLsizei drawcount);
 };
diff --git a/tests/wpt/tests/interfaces/WEBGL_multi_draw_instanced_base_vertex_base_instance.idl b/tests/wpt/tests/interfaces/WEBGL_multi_draw_instanced_base_vertex_base_instance.idl
index 2258fa9a10c..7e4515cc36b 100644
--- a/tests/wpt/tests/interfaces/WEBGL_multi_draw_instanced_base_vertex_base_instance.idl
+++ b/tests/wpt/tests/interfaces/WEBGL_multi_draw_instanced_base_vertex_base_instance.idl
@@ -7,20 +7,20 @@
 interface WEBGL_multi_draw_instanced_base_vertex_base_instance {
   undefined multiDrawArraysInstancedBaseInstanceWEBGL(
       GLenum mode,
-      ([AllowShared] Int32Array or sequence<GLint>) firstsList, GLuint firstsOffset,
-      ([AllowShared] Int32Array or sequence<GLsizei>) countsList, GLuint countsOffset,
-      ([AllowShared] Int32Array or sequence<GLsizei>) instanceCountsList, GLuint instanceCountsOffset,
-      ([AllowShared] Uint32Array or sequence<GLuint>) baseInstancesList, GLuint baseInstancesOffset,
+      ([AllowShared] Int32Array or sequence<GLint>) firstsList, unsigned long long firstsOffset,
+      ([AllowShared] Int32Array or sequence<GLsizei>) countsList, unsigned long long countsOffset,
+      ([AllowShared] Int32Array or sequence<GLsizei>) instanceCountsList, unsigned long long instanceCountsOffset,
+      ([AllowShared] Uint32Array or sequence<GLuint>) baseInstancesList, unsigned long long baseInstancesOffset,
       GLsizei drawcount
   );
   undefined multiDrawElementsInstancedBaseVertexBaseInstanceWEBGL(
       GLenum mode,
-      ([AllowShared] Int32Array or sequence<GLsizei>) countsList, GLuint countsOffset,
+      ([AllowShared] Int32Array or sequence<GLsizei>) countsList, unsigned long long countsOffset,
       GLenum type,
-      ([AllowShared] Int32Array or sequence<GLsizei>) offsetsList, GLuint offsetsOffset,
-      ([AllowShared] Int32Array or sequence<GLsizei>) instanceCountsList, GLuint instanceCountsOffset,
-      ([AllowShared] Int32Array or sequence<GLint>) baseVerticesList, GLuint baseVerticesOffset,
-      ([AllowShared] Uint32Array or sequence<GLuint>) baseInstancesList, GLuint baseInstancesOffset,
+      ([AllowShared] Int32Array or sequence<GLsizei>) offsetsList, unsigned long long offsetsOffset,
+      ([AllowShared] Int32Array or sequence<GLsizei>) instanceCountsList, unsigned long long instanceCountsOffset,
+      ([AllowShared] Int32Array or sequence<GLint>) baseVerticesList, unsigned long long baseVerticesOffset,
+      ([AllowShared] Uint32Array or sequence<GLuint>) baseInstancesList, unsigned long long baseInstancesOffset,
       GLsizei drawcount
   );
 };
diff --git a/tests/wpt/tests/interfaces/audio-session.idl b/tests/wpt/tests/interfaces/audio-session.idl
new file mode 100644
index 00000000000..f542347c710
--- /dev/null
+++ b/tests/wpt/tests/interfaces/audio-session.idl
@@ -0,0 +1,33 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Audio Session (https://w3c.github.io/audio-session/)
+
+enum AudioSessionState {
+  "inactive",
+  "active",
+  "interrupted"
+};
+
+enum AudioSessionType {
+  "auto",
+  "playback",
+  "transient",
+  "transient-solo",
+  "ambient",
+  "play-and-record"
+};
+
+[Exposed=Window]
+partial interface Navigator {
+  // The default audio session that the user agent will use when media elements start/stop playing.
+  readonly attribute AudioSession audioSession;
+};
+
+[Exposed=Window]
+interface AudioSession : EventTarget {
+  attribute AudioSessionType type;
+
+  readonly attribute AudioSessionState state;
+  attribute EventHandler onstatechange;
+};
diff --git a/tests/wpt/tests/interfaces/clipboard-apis.idl b/tests/wpt/tests/interfaces/clipboard-apis.idl
index 3f2c9ba6f28..51d5af18dc2 100644
--- a/tests/wpt/tests/interfaces/clipboard-apis.idl
+++ b/tests/wpt/tests/interfaces/clipboard-apis.idl
@@ -28,6 +28,8 @@ interface ClipboardItem {
   readonly attribute FrozenArray<DOMString> types;
 
   Promise<Blob> getType(DOMString type);
+
+  static boolean supports(DOMString type);
 };
 
 enum PresentationStyle { "unspecified", "inline", "attachment" };
diff --git a/tests/wpt/tests/interfaces/css-view-transitions-2.idl b/tests/wpt/tests/interfaces/css-view-transitions-2.idl
new file mode 100644
index 00000000000..6d23f406b01
--- /dev/null
+++ b/tests/wpt/tests/interfaces/css-view-transitions-2.idl
@@ -0,0 +1,9 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: CSS View Transitions Module Level 2 (https://drafts.csswg.org/css-view-transitions-2/)
+
+[Exposed=Window]
+interface PageRevealEvent : Event {
+  readonly attribute ViewTransition? viewTransition;
+};
diff --git a/tests/wpt/tests/interfaces/edit-context.idl b/tests/wpt/tests/interfaces/edit-context.idl
index 937b6579376..011130480e9 100644
--- a/tests/wpt/tests/interfaces/edit-context.idl
+++ b/tests/wpt/tests/interfaces/edit-context.idl
@@ -66,11 +66,14 @@ interface TextUpdateEvent : Event {
     readonly attribute unsigned long compositionEnd;
 };
 
+enum UnderlineStyle { "none", "solid", "double", "dotted", "dashed", "wavy" };
+enum UnderlineThickness { "none", "thin", "thick" };
+
 dictionary TextFormatInit {
     unsigned long rangeStart;
     unsigned long rangeEnd;
-    DOMString underlineStyle;
-    DOMString underlineThickness;
+    UnderlineStyle underlineStyle;
+    UnderlineThickness underlineThickness;
 };
 
 [Exposed=Window]
@@ -78,8 +81,8 @@ interface TextFormat {
     constructor(optional TextFormatInit options = {});
     readonly attribute unsigned long rangeStart;
     readonly attribute unsigned long rangeEnd;
-    readonly attribute DOMString underlineStyle;
-    readonly attribute DOMString underlineThickness;
+    readonly attribute UnderlineStyle underlineStyle;
+    readonly attribute UnderlineThickness underlineThickness;
 };
 
 dictionary TextFormatUpdateEventInit : EventInit {
diff --git a/tests/wpt/tests/interfaces/fenced-frame.idl b/tests/wpt/tests/interfaces/fenced-frame.idl
index 75196932821..0eed6a6b4ba 100644
--- a/tests/wpt/tests/interfaces/fenced-frame.idl
+++ b/tests/wpt/tests/interfaces/fenced-frame.idl
@@ -28,6 +28,13 @@ interface FencedFrameConfig {
   undefined setSharedStorageContext(DOMString contextString);
 };
 
+typedef (USVString or FencedFrameConfig) UrnOrConfig;
+
+partial interface Navigator {
+  Promise<undefined> deprecatedReplaceInURN(
+    UrnOrConfig urnOrConfig, record<USVString, USVString> replacements);
+};
+
 enum FenceReportingDestination {
   "buyer",
   "seller",
@@ -37,18 +44,27 @@ enum FenceReportingDestination {
 };
 
 dictionary FenceEvent {
-  required DOMString eventType;
-  required DOMString eventData;
-  required sequence<FenceReportingDestination> destination;
+  // This dictionary has two mutually exclusive modes that aren’t represented as
+  // distinct IDL types due to distinguishability issues:
+  //
+  // When reporting to a preregistered destination (specified by enum), the following
+  // properties are used:
+  DOMString eventType;
+  DOMString eventData;
+  sequence<FenceReportingDestination> destination;
   boolean once = false;
+
+  // When reporting to a custom destination URL (with substitution of macros defined by
+  // the Protected Audience buyer), the following property is used:
+  USVString destinationURL;
 };
 
 typedef (FenceEvent or DOMString) ReportEventType;
 
 [Exposed=Window]
 interface Fence {
-    undefined reportEvent(ReportEventType event);
-    undefined setReportEventDataForAutomaticBeacons(FenceEvent event);
+    undefined reportEvent(optional ReportEventType event = {});
+    undefined setReportEventDataForAutomaticBeacons(optional FenceEvent event = {});
     sequence<FencedFrameConfig> getNestedConfigs();
 };
 
diff --git a/tests/wpt/tests/interfaces/html.idl b/tests/wpt/tests/interfaces/html.idl
index eec3f781c74..c7f744ccbe6 100644
--- a/tests/wpt/tests/interfaces/html.idl
+++ b/tests/wpt/tests/interfaces/html.idl
@@ -1783,7 +1783,7 @@ interface Window : EventTarget {
 
   // the user agent
   readonly attribute Navigator navigator;
-  readonly attribute Navigator clientInformation; // legacy alias of .navigator
+  [Replaceable] readonly attribute Navigator clientInformation; // legacy alias of .navigator
   readonly attribute boolean originAgentCluster;
 
   // user prompts
diff --git a/tests/wpt/tests/interfaces/intersection-observer.idl b/tests/wpt/tests/interfaces/intersection-observer.idl
index 52db1c4baa9..8502a11357f 100644
--- a/tests/wpt/tests/interfaces/intersection-observer.idl
+++ b/tests/wpt/tests/interfaces/intersection-observer.idl
@@ -10,6 +10,7 @@ interface IntersectionObserver {
   constructor(IntersectionObserverCallback callback, optional IntersectionObserverInit options = {});
   readonly attribute (Element or Document)? root;
   readonly attribute DOMString rootMargin;
+  readonly attribute DOMString scrollMargin;
   readonly attribute FrozenArray<double> thresholds;
   undefined observe(Element target);
   undefined unobserve(Element target);
@@ -42,5 +43,6 @@ dictionary IntersectionObserverEntryInit {
 dictionary IntersectionObserverInit {
   (Element or Document)?  root = null;
   DOMString rootMargin = "0px";
+  DOMString scrollMargin = "0px";
   (double or sequence<double>) threshold = 0;
 };
diff --git a/tests/wpt/tests/interfaces/mediasession.idl b/tests/wpt/tests/interfaces/mediasession.idl
index cca46ac5a85..83c1eb59dff 100644
--- a/tests/wpt/tests/interfaces/mediasession.idl
+++ b/tests/wpt/tests/interfaces/mediasession.idl
@@ -1,7 +1,7 @@
 // GENERATED CONTENT - DO NOT EDIT
 // Content was automatically extracted by Reffy into webref
 // (https://github.com/w3c/webref)
-// Source: Media Session Standard (https://w3c.github.io/mediasession/)
+// Source: Media Session (https://w3c.github.io/mediasession/)
 
 [Exposed=Window]
 partial interface Navigator {
diff --git a/tests/wpt/tests/interfaces/shared-storage.idl b/tests/wpt/tests/interfaces/shared-storage.idl
index d223736f29f..edbe2c2bcc3 100644
--- a/tests/wpt/tests/interfaces/shared-storage.idl
+++ b/tests/wpt/tests/interfaces/shared-storage.idl
@@ -84,3 +84,14 @@ interface WorkletSharedStorage : SharedStorage {
 
   async iterable<DOMString, DOMString>;
 };
+
+interface mixin HTMLSharedStorageWritableElementUtils {
+  [CEReactions, SecureContext] attribute boolean sharedStorageWritable;
+};
+
+HTMLIFrameElement includes HTMLSharedStorageWritableElementUtils;
+HTMLImageElement includes HTMLSharedStorageWritableElementUtils;
+
+partial dictionary RequestInit {
+  boolean sharedStorageWritable;
+};
diff --git a/tests/wpt/tests/interfaces/turtledove.idl b/tests/wpt/tests/interfaces/turtledove.idl
index 393792ffeac..c7f49f70a92 100644
--- a/tests/wpt/tests/interfaces/turtledove.idl
+++ b/tests/wpt/tests/interfaces/turtledove.idl
@@ -11,8 +11,10 @@ partial interface Navigator {
 dictionary AuctionAd {
   required USVString renderURL;
   any metadata;
+
   USVString buyerReportingId;
   USVString buyerAndSellerReportingId;
+  sequence<USVString> allowedReportingOrigins;
 };
 
 dictionary GenerateBidInterestGroup {
@@ -121,6 +123,7 @@ interface InterestGroupReportingScriptRunnerGlobalScope
         : InterestGroupScriptRunnerGlobalScope {
   undefined sendReportTo(DOMString url);
   undefined registerAdBeacon(record<DOMString, USVString> map);
+  undefined registerAdMacro(DOMString name, USVString value);
 };
 
 [SecureContext]
diff --git a/tests/wpt/tests/interfaces/ua-client-hints.idl b/tests/wpt/tests/interfaces/ua-client-hints.idl
index c69714b9734..6a40e1bdc4b 100644
--- a/tests/wpt/tests/interfaces/ua-client-hints.idl
+++ b/tests/wpt/tests/interfaces/ua-client-hints.idl
@@ -12,7 +12,7 @@ dictionary UADataValues {
   DOMString architecture;
   DOMString bitness;
   sequence<NavigatorUABrandVersion> brands;
-  DOMString formFactor;
+  sequence<DOMString> formFactor;
   sequence<NavigatorUABrandVersion> fullVersionList;
   DOMString model;
   boolean mobile;
diff --git a/tests/wpt/tests/interfaces/uievents.idl b/tests/wpt/tests/interfaces/uievents.idl
index 5fdc812e700..fef90d48410 100644
--- a/tests/wpt/tests/interfaces/uievents.idl
+++ b/tests/wpt/tests/interfaces/uievents.idl
@@ -32,6 +32,8 @@ interface MouseEvent : UIEvent {
   readonly attribute long screenY;
   readonly attribute long clientX;
   readonly attribute long clientY;
+  readonly attribute long layerX;
+  readonly attribute long layerY;
 
   readonly attribute boolean ctrlKey;
   readonly attribute boolean shiftKey;
diff --git a/tests/wpt/tests/interfaces/webaudio.idl b/tests/wpt/tests/interfaces/webaudio.idl
index 1569de204bd..73dc35d2609 100644
--- a/tests/wpt/tests/interfaces/webaudio.idl
+++ b/tests/wpt/tests/interfaces/webaudio.idl
@@ -9,6 +9,11 @@ enum AudioContextState {
     "closed"
 };
 
+enum AudioContextRenderSizeCategory {
+    "default",
+    "hardware"
+};
+
 callback DecodeErrorCallback = undefined (DOMException error);
 
 callback DecodeSuccessCallback = undefined (AudioBuffer decodedData);
@@ -20,6 +25,7 @@ interface BaseAudioContext : EventTarget {
     readonly attribute double currentTime;
     readonly attribute AudioListener listener;
     readonly attribute AudioContextState state;
+    readonly attribute unsigned long renderQuantumSize;
     [SameObject, SecureContext]
     readonly attribute AudioWorklet audioWorklet;
     attribute EventHandler onstatechange;
@@ -92,6 +98,7 @@ dictionary AudioContextOptions {
     (AudioContextLatencyCategory or double) latencyHint = "interactive";
     float sampleRate;
     (DOMString or AudioSinkOptions) sinkId;
+    (AudioContextRenderSizeCategory or unsigned long) renderSizeHint = "default";
 };
 
 dictionary AudioSinkOptions {
@@ -150,6 +157,7 @@ dictionary OfflineAudioContextOptions {
     unsigned long numberOfChannels = 1;
     required unsigned long length;
     required float sampleRate;
+    (AudioContextRenderSizeCategory or unsigned long) renderSizeHint = "default";
 };
 
 [Exposed=Window]
@@ -629,6 +637,7 @@ interface AudioWorkletGlobalScope : WorkletGlobalScope {
     readonly attribute unsigned long long currentFrame;
     readonly attribute double currentTime;
     readonly attribute float sampleRate;
+    readonly attribute unsigned long renderQuantumSize;
     readonly attribute MessagePort port;
 };
 
diff --git a/tests/wpt/tests/interfaces/webgl2.idl b/tests/wpt/tests/interfaces/webgl2.idl
index 5499e5a68b1..9cb639932e8 100644
--- a/tests/wpt/tests/interfaces/webgl2.idl
+++ b/tests/wpt/tests/interfaces/webgl2.idl
@@ -304,7 +304,7 @@ interface mixin WebGL2RenderingContextBase
   // can not be exposed safely to JavaScript. GetBufferSubData
   // replaces it for the purpose of fetching data back from the GPU.
   undefined getBufferSubData(GLenum target, GLintptr srcByteOffset, [AllowShared] ArrayBufferView dstBuffer,
-                             optional GLuint dstOffset = 0, optional GLuint length = 0);
+                             optional unsigned long long dstOffset = 0, optional GLuint length = 0);
 
   /* Framebuffer objects */
   undefined blitFramebuffer(GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1, GLint dstX0, GLint dstY0,
@@ -336,7 +336,7 @@ interface mixin WebGL2RenderingContextBase
                        GLsizei depth, GLint border, GLenum format, GLenum type, [AllowShared] ArrayBufferView? srcData);
   undefined texImage3D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height,
                        GLsizei depth, GLint border, GLenum format, GLenum type, [AllowShared] ArrayBufferView srcData,
-                       GLuint srcOffset);
+                       unsigned long long srcOffset);
 
   undefined texSubImage3D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset,
                           GLsizei width, GLsizei height, GLsizei depth, GLenum format, GLenum type,
@@ -346,7 +346,7 @@ interface mixin WebGL2RenderingContextBase
                           TexImageSource source); // May throw DOMException
   undefined texSubImage3D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset,
                           GLsizei width, GLsizei height, GLsizei depth, GLenum format, GLenum type,
-                          [AllowShared] ArrayBufferView? srcData, optional GLuint srcOffset = 0);
+                          [AllowShared] ArrayBufferView? srcData, optional unsigned long long srcOffset = 0);
 
   undefined copyTexSubImage3D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset,
                               GLint x, GLint y, GLsizei width, GLsizei height);
@@ -355,7 +355,7 @@ interface mixin WebGL2RenderingContextBase
                                  GLsizei height, GLsizei depth, GLint border, GLsizei imageSize, GLintptr offset);
   undefined compressedTexImage3D(GLenum target, GLint level, GLenum internalformat, GLsizei width,
                                  GLsizei height, GLsizei depth, GLint border, [AllowShared] ArrayBufferView srcData,
-                                 optional GLuint srcOffset = 0, optional GLuint srcLengthOverride = 0);
+                                 optional unsigned long long srcOffset = 0, optional GLuint srcLengthOverride = 0);
 
   undefined compressedTexSubImage3D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
                                     GLint zoffset, GLsizei width, GLsizei height, GLsizei depth,
@@ -363,7 +363,7 @@ interface mixin WebGL2RenderingContextBase
   undefined compressedTexSubImage3D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
                                     GLint zoffset, GLsizei width, GLsizei height, GLsizei depth,
                                     GLenum format, [AllowShared] ArrayBufferView srcData,
-                                    optional GLuint srcOffset = 0,
+                                    optional unsigned long long srcOffset = 0,
                                     optional GLuint srcLengthOverride = 0);
 
   /* Programs and shaders */
@@ -375,28 +375,28 @@ interface mixin WebGL2RenderingContextBase
   undefined uniform3ui(WebGLUniformLocation? location, GLuint v0, GLuint v1, GLuint v2);
   undefined uniform4ui(WebGLUniformLocation? location, GLuint v0, GLuint v1, GLuint v2, GLuint v3);
 
-  undefined uniform1uiv(WebGLUniformLocation? location, Uint32List data, optional GLuint srcOffset = 0,
+  undefined uniform1uiv(WebGLUniformLocation? location, Uint32List data, optional unsigned long long srcOffset = 0,
                         optional GLuint srcLength = 0);
-  undefined uniform2uiv(WebGLUniformLocation? location, Uint32List data, optional GLuint srcOffset = 0,
+  undefined uniform2uiv(WebGLUniformLocation? location, Uint32List data, optional unsigned long long srcOffset = 0,
                         optional GLuint srcLength = 0);
-  undefined uniform3uiv(WebGLUniformLocation? location, Uint32List data, optional GLuint srcOffset = 0,
+  undefined uniform3uiv(WebGLUniformLocation? location, Uint32List data, optional unsigned long long srcOffset = 0,
                         optional GLuint srcLength = 0);
-  undefined uniform4uiv(WebGLUniformLocation? location, Uint32List data, optional GLuint srcOffset = 0,
+  undefined uniform4uiv(WebGLUniformLocation? location, Uint32List data, optional unsigned long long srcOffset = 0,
                         optional GLuint srcLength = 0);
   undefined uniformMatrix3x2fv(WebGLUniformLocation? location, GLboolean transpose, Float32List data,
-                               optional GLuint srcOffset = 0, optional GLuint srcLength = 0);
+                               optional unsigned long long srcOffset = 0, optional GLuint srcLength = 0);
   undefined uniformMatrix4x2fv(WebGLUniformLocation? location, GLboolean transpose, Float32List data,
-                               optional GLuint srcOffset = 0, optional GLuint srcLength = 0);
+                               optional unsigned long long srcOffset = 0, optional GLuint srcLength = 0);
 
   undefined uniformMatrix2x3fv(WebGLUniformLocation? location, GLboolean transpose, Float32List data,
-                               optional GLuint srcOffset = 0, optional GLuint srcLength = 0);
+                               optional unsigned long long srcOffset = 0, optional GLuint srcLength = 0);
   undefined uniformMatrix4x3fv(WebGLUniformLocation? location, GLboolean transpose, Float32List data,
-                               optional GLuint srcOffset = 0, optional GLuint srcLength = 0);
+                               optional unsigned long long srcOffset = 0, optional GLuint srcLength = 0);
 
   undefined uniformMatrix2x4fv(WebGLUniformLocation? location, GLboolean transpose, Float32List data,
-                               optional GLuint srcOffset = 0, optional GLuint srcLength = 0);
+                               optional unsigned long long srcOffset = 0, optional GLuint srcLength = 0);
   undefined uniformMatrix3x4fv(WebGLUniformLocation? location, GLboolean transpose, Float32List data,
-                               optional GLuint srcOffset = 0, optional GLuint srcLength = 0);
+                               optional unsigned long long srcOffset = 0, optional GLuint srcLength = 0);
 
   /* Vertex attribs */
   undefined vertexAttribI4i(GLuint index, GLint x, GLint y, GLint z, GLint w);
@@ -415,11 +415,11 @@ interface mixin WebGL2RenderingContextBase
   undefined drawBuffers(sequence<GLenum> buffers);
 
   undefined clearBufferfv(GLenum buffer, GLint drawbuffer, Float32List values,
-                          optional GLuint srcOffset = 0);
+                          optional unsigned long long srcOffset = 0);
   undefined clearBufferiv(GLenum buffer, GLint drawbuffer, Int32List values,
-                          optional GLuint srcOffset = 0);
+                          optional unsigned long long srcOffset = 0);
   undefined clearBufferuiv(GLenum buffer, GLint drawbuffer, Uint32List values,
-                           optional GLuint srcOffset = 0);
+                           optional unsigned long long srcOffset = 0);
 
   undefined clearBufferfi(GLenum buffer, GLint drawbuffer, GLfloat depth, GLint stencil);
 
@@ -486,10 +486,10 @@ interface mixin WebGL2RenderingContextOverloads
   undefined bufferData(GLenum target, AllowSharedBufferSource? srcData, GLenum usage);
   undefined bufferSubData(GLenum target, GLintptr dstByteOffset, AllowSharedBufferSource srcData);
   // WebGL2:
-  undefined bufferData(GLenum target, [AllowShared] ArrayBufferView srcData, GLenum usage, GLuint srcOffset,
+  undefined bufferData(GLenum target, [AllowShared] ArrayBufferView srcData, GLenum usage, unsigned long long srcOffset,
                        optional GLuint length = 0);
   undefined bufferSubData(GLenum target, GLintptr dstByteOffset, [AllowShared] ArrayBufferView srcData,
-                          GLuint srcOffset, optional GLuint length = 0);
+                          unsigned long long srcOffset, optional GLuint length = 0);
 
   // WebGL1 legacy entrypoints:
   undefined texImage2D(GLenum target, GLint level, GLint internalformat,
@@ -512,7 +512,7 @@ interface mixin WebGL2RenderingContextOverloads
                        TexImageSource source); // May throw DOMException
   undefined texImage2D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height,
                        GLint border, GLenum format, GLenum type, [AllowShared] ArrayBufferView srcData,
-                       GLuint srcOffset);
+                       unsigned long long srcOffset);
 
   undefined texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width,
                           GLsizei height, GLenum format, GLenum type, GLintptr pboOffset);
@@ -521,46 +521,46 @@ interface mixin WebGL2RenderingContextOverloads
                           TexImageSource source); // May throw DOMException
   undefined texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width,
                           GLsizei height, GLenum format, GLenum type, [AllowShared] ArrayBufferView srcData,
-                          GLuint srcOffset);
+                          unsigned long long srcOffset);
 
   undefined compressedTexImage2D(GLenum target, GLint level, GLenum internalformat, GLsizei width,
                                  GLsizei height, GLint border, GLsizei imageSize, GLintptr offset);
   undefined compressedTexImage2D(GLenum target, GLint level, GLenum internalformat, GLsizei width,
                                  GLsizei height, GLint border, [AllowShared] ArrayBufferView srcData,
-                                 optional GLuint srcOffset = 0, optional GLuint srcLengthOverride = 0);
+                                 optional unsigned long long srcOffset = 0, optional GLuint srcLengthOverride = 0);
 
   undefined compressedTexSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
                                     GLsizei width, GLsizei height, GLenum format, GLsizei imageSize, GLintptr offset);
   undefined compressedTexSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
                                     GLsizei width, GLsizei height, GLenum format,
                                     [AllowShared] ArrayBufferView srcData,
-                                    optional GLuint srcOffset = 0,
+                                    optional unsigned long long srcOffset = 0,
                                     optional GLuint srcLengthOverride = 0);
 
-  undefined uniform1fv(WebGLUniformLocation? location, Float32List data, optional GLuint srcOffset = 0,
+  undefined uniform1fv(WebGLUniformLocation? location, Float32List data, optional unsigned long long srcOffset = 0,
                        optional GLuint srcLength = 0);
-  undefined uniform2fv(WebGLUniformLocation? location, Float32List data, optional GLuint srcOffset = 0,
+  undefined uniform2fv(WebGLUniformLocation? location, Float32List data, optional unsigned long long srcOffset = 0,
                        optional GLuint srcLength = 0);
-  undefined uniform3fv(WebGLUniformLocation? location, Float32List data, optional GLuint srcOffset = 0,
+  undefined uniform3fv(WebGLUniformLocation? location, Float32List data, optional unsigned long long srcOffset = 0,
                        optional GLuint srcLength = 0);
-  undefined uniform4fv(WebGLUniformLocation? location, Float32List data, optional GLuint srcOffset = 0,
+  undefined uniform4fv(WebGLUniformLocation? location, Float32List data, optional unsigned long long srcOffset = 0,
                        optional GLuint srcLength = 0);
 
-  undefined uniform1iv(WebGLUniformLocation? location, Int32List data, optional GLuint srcOffset = 0,
+  undefined uniform1iv(WebGLUniformLocation? location, Int32List data, optional unsigned long long srcOffset = 0,
                        optional GLuint srcLength = 0);
-  undefined uniform2iv(WebGLUniformLocation? location, Int32List data, optional GLuint srcOffset = 0,
+  undefined uniform2iv(WebGLUniformLocation? location, Int32List data, optional unsigned long long srcOffset = 0,
                        optional GLuint srcLength = 0);
-  undefined uniform3iv(WebGLUniformLocation? location, Int32List data, optional GLuint srcOffset = 0,
+  undefined uniform3iv(WebGLUniformLocation? location, Int32List data, optional unsigned long long srcOffset = 0,
                        optional GLuint srcLength = 0);
-  undefined uniform4iv(WebGLUniformLocation? location, Int32List data, optional GLuint srcOffset = 0,
+  undefined uniform4iv(WebGLUniformLocation? location, Int32List data, optional unsigned long long srcOffset = 0,
                        optional GLuint srcLength = 0);
 
   undefined uniformMatrix2fv(WebGLUniformLocation? location, GLboolean transpose, Float32List data,
-                             optional GLuint srcOffset = 0, optional GLuint srcLength = 0);
+                             optional unsigned long long srcOffset = 0, optional GLuint srcLength = 0);
   undefined uniformMatrix3fv(WebGLUniformLocation? location, GLboolean transpose, Float32List data,
-                             optional GLuint srcOffset = 0, optional GLuint srcLength = 0);
+                             optional unsigned long long srcOffset = 0, optional GLuint srcLength = 0);
   undefined uniformMatrix4fv(WebGLUniformLocation? location, GLboolean transpose, Float32List data,
-                             optional GLuint srcOffset = 0, optional GLuint srcLength = 0);
+                             optional unsigned long long srcOffset = 0, optional GLuint srcLength = 0);
 
   /* Reading back pixels */
   // WebGL1:
@@ -570,7 +570,7 @@ interface mixin WebGL2RenderingContextOverloads
   undefined readPixels(GLint x, GLint y, GLsizei width, GLsizei height, GLenum format, GLenum type,
                        GLintptr offset);
   undefined readPixels(GLint x, GLint y, GLsizei width, GLsizei height, GLenum format, GLenum type,
-                       [AllowShared] ArrayBufferView dstData, GLuint dstOffset);
+                       [AllowShared] ArrayBufferView dstData, unsigned long long dstOffset);
 };
 
 [Exposed=(Window,Worker)]
diff --git a/tests/wpt/tests/interfaces/webrtc-encoded-transform.idl b/tests/wpt/tests/interfaces/webrtc-encoded-transform.idl
index 6dd2ba3fffa..1a456577d38 100644
--- a/tests/wpt/tests/interfaces/webrtc-encoded-transform.idl
+++ b/tests/wpt/tests/interfaces/webrtc-encoded-transform.idl
@@ -78,7 +78,7 @@ dictionary RTCEncodedVideoFrameMetadata {
 
 // New interfaces to define encoded video and audio frames. Will eventually
 // re-use or extend the equivalent defined in WebCodecs.
-[Exposed=(Window,DedicatedWorker)]
+[Exposed=(Window,DedicatedWorker), Serializable]
 interface RTCEncodedVideoFrame {
     readonly attribute RTCEncodedVideoFrameType type;
     readonly attribute unsigned long timestamp;
@@ -93,7 +93,7 @@ dictionary RTCEncodedAudioFrameMetadata {
     short sequenceNumber;
 };
 
-[Exposed=(Window,DedicatedWorker)]
+[Exposed=(Window,DedicatedWorker), Serializable]
 interface RTCEncodedAudioFrame {
     readonly attribute unsigned long timestamp;
     attribute ArrayBuffer data;
diff --git a/tests/wpt/tests/interfaces/webtransport.idl b/tests/wpt/tests/interfaces/webtransport.idl
index a9f514e2366..284ab350829 100644
--- a/tests/wpt/tests/interfaces/webtransport.idl
+++ b/tests/wpt/tests/interfaces/webtransport.idl
@@ -19,7 +19,7 @@ interface WebTransportDatagramDuplexStream {
 interface WebTransport {
   constructor(USVString url, optional WebTransportOptions options = {});
 
-  Promise<WebTransportStats> getStats();
+  Promise<WebTransportConnectionStats> getStats();
   readonly attribute Promise<undefined> ready;
   readonly attribute WebTransportReliabilityMode reliability;
   readonly attribute WebTransportCongestionControl congestionControl;
@@ -73,13 +73,12 @@ dictionary WebTransportSendStreamOptions {
   long long? sendOrder = null;
 };
 
-dictionary WebTransportStats {
+dictionary WebTransportConnectionStats {
   DOMHighResTimeStamp timestamp;
   unsigned long long bytesSent;
   unsigned long long packetsSent;
+  unsigned long long bytesLost;
   unsigned long long packetsLost;
-  unsigned long numOutgoingStreamsCreated;
-  unsigned long numIncomingStreamsCreated;
   unsigned long long bytesReceived;
   unsigned long long packetsReceived;
   DOMHighResTimeStamp smoothedRtt;
diff --git a/tests/wpt/tests/mst-content-hint/RTCRtpSendParameters-degradationEffect.html b/tests/wpt/tests/mst-content-hint/RTCRtpSendParameters-degradationEffect.html
index e6a03c593f3..a2da6cd139f 100644
--- a/tests/wpt/tests/mst-content-hint/RTCRtpSendParameters-degradationEffect.html
+++ b/tests/wpt/tests/mst-content-hint/RTCRtpSendParameters-degradationEffect.html
@@ -11,56 +11,61 @@
 // This file contains tests that check that degradation preference
 // actually has the desired effect. These tests take a long time to run.
 
+// The signal generator will generate a video stream with at least this
+// many bits per second if unconstrained.
+const minUnconstrainedBandwidth = 30000;
+
 // Returns incoming bandwidth usage between stats1 and stats2
 // in bits per second.
 function bandwidth(stats1, stats2) {
+  if (!stats1 || !stats2) {
+    return null;
+  }
   const transport1 = [...stats1.values()].filter(({type}) => type === 'transport')[0];
   const transport2 = [...stats2.values()].filter(({type}) => type === 'transport')[0];
   const bytes = transport2.bytesReceived - transport1.bytesReceived;
-  // Multiply by 1000 to get per second, divide by 8 to get bits.
+  // If time interval is too short for proper measurement, return null.
+  if (transport1.timestamp > transport2.timestamp - 100) {
+    return null;
+  }
+  // Multiply by 1000 to get per second, multiply by 8 to get bits.
   const bandwidth = 1000 * 8 * bytes /
         (transport2.timestamp - transport1.timestamp);
   return bandwidth;
 }
 
+let oldStats;
+
 // Returns tuple of { bandwidth, fps, x-res, y-res }
-async function measureStuff(t, pc, intervalMs) {
-  const stats1 = await pc.getStats();
-  await new Promise(r => t.step_timeout(r, intervalMs));
-  const stats2 = await pc.getStats();
+// Updates oldStats.
+async function measureStuff(pc) {
+  const stats = await pc.getStats();
+  if (!oldStats) {
+    oldStats = stats;
+    return {};
+  }
   // RTCInboundStreamStats
-  const inboundRtp1List = [...stats1.values()].filter(({type}) => type === 'inbound-rtp');
-  const inboundRtp2List = [...stats2.values()].filter(({type}) => type === 'inbound-rtp');
-  const inboundRtp1 = inboundRtp1List[0];
-  const inboundRtp2 = inboundRtp2List[0];
-  const fps = 1000 * (inboundRtp2.framesReceived - inboundRtp1.framesReceived) /
-        (inboundRtp2.timestamp - inboundRtp1.timestamp);
+  const oldRtpList = [...oldStats.values()].filter(({type}) => type === 'inbound-rtp');
+  const inboundRtpList = [...stats.values()].filter(({type}) => type === 'inbound-rtp');
+  const oldRtp = oldRtpList[0];
+  const inboundRtp = inboundRtpList[0];
+  const fps = 1000.0 * (inboundRtp.framesReceived - oldRtp.framesReceived) /
+        (inboundRtp.timestamp - oldRtp.timestamp);
   const result = {
-    bandwidth: bandwidth(stats1, stats2),
+    bandwidth: bandwidth(oldStats, stats),
     fps: fps,
-    width: inboundRtp2.frameWidth,
-    height: inboundRtp2.frameHeight
+    width: inboundRtp.frameWidth,
+    height: inboundRtp.frameHeight
   };
+  oldStats = stats;
+  if (!result.bandwidth) {
+    return {};
+  }
   // Unbreak for debugging.
   // con sole.log('Measure: ', performance.now(), " ", JSON.stringify(result));
   return result;
 }
 
-// Wait for a certain condition to be true on the traffic measures
-// on the PC. Will typically be conditions on resolution, framerate
-// or bandwidth.
-async function waitForCondition(t, pc, condition, maxWait, stepName) {
-  let counter = 1;
-  let measure = await measureStuff(t, pc, 1000);
-  while (counter < maxWait && !condition(measure)) {
-    measure = await measureStuff(t, pc, 1000);
-    counter += 1;
-  }
-  assert_true(condition(measure),
-              `failure in ${stepName}, measure is ${JSON.stringify(measure)}`);
-  return condition(measure);
-}
-
 promise_test(async t => {
   const pc1 = new RTCPeerConnection();
   t.add_cleanup(() => pc1.close());
@@ -71,9 +76,6 @@ promise_test(async t => {
 
   let param = sender.getParameters();
 
-  assert_equals(param.degradationPreference, undefined,
-    'Expect initial param.degradationPreference to be undefined');
-
   param.degradationPreference = 'maintain-framerate';
   await sender.setParameters(param);
 
@@ -83,38 +85,45 @@ promise_test(async t => {
   exchangeIceCandidates(pc1, pc2);
   await exchangeOfferAnswer(pc1, pc2);
   await listenToConnected(pc1);
+  // Allow the keyframe to pass.
+  await new Promise(r => t.step_timeout(r, 1000));
   // Wait a few seconds to allow things to settle (rampup)
   // We know that the generator is supposed to produce 640x480
   // at 10 fps with a bandwidth exceeding 30 kbits/second.
-  assert_true(await waitForCondition(t, pc2, (measure) => {
-    return (measure.bandwidth > 30000 &&
+  await t.step_wait(async () => {
+    const measure = await measureStuff(pc2);
+    return (measure.bandwidth > minUnconstrainedBandwidth &&
             measure.width == 640 &&
             measure.fps > 9);
-  }, 60, 'preconditions'));
+  }, 'Test error: Preconditions not achieved', 30000, 500);
 
   // Measure BW, resolution and frame rate over one second
-  const stats1 = await measureStuff(t, pc2, 1000);
+  // after measurements have stabilized.
+  await new Promise(r => t.step_timeout(r, 1000));
+  const stats1 = await measureStuff(pc2);
 
   // Constrain BW to 1/2 of measured value
   const newBandwidth = stats1.bandwidth / 2;
+  // Guard against inappropriate bandwidth
+  assert_greater_than(newBandwidth, minUnconstrainedBandwidth/2,
+                      "Test error: Constraint too low");
 
   const parameters = sender.getParameters();
   parameters.encodings[0].maxBitrate = newBandwidth;
   await sender.setParameters(parameters);
   // Wait until the expected result happens.
-  let stats2 = await measureStuff(t, pc2, 1000);
-  let counter = 1;
-  const maxWaitCount = 20;
   const kBandwidthMargin = 1.3;
   // It takes time to adapt to a new bandwidth, time to scale down,
   // and time to acknowledge that framerate should not be reduced.
   // Measured time is around 16 seconds.
-  assert_true(await waitForCondition(t, pc2, (measure) => {
-    return (measure.bandwidth < newBandwidth * kBandwidthMargin &&
+  await t.step_wait(async () => {
+    let measure = await measureStuff(pc2);
+    return (measure.bandwidth &&
+            measure.bandwidth < newBandwidth * kBandwidthMargin &&
             measure.width < stats1.width &&
             measure.fps > stats1.fps * 0.9);
-  }, 60, 'adaptation'),
-             `Target bandwidth ${newBandwidth * kBandwidthMargin}, target min FPS ${stats1.fps * 0.9}`);
+  }, 'Adaptation did not succeed',
+              30000, 500);
 }, 'Maintain-framerate reduces resolution on bandwidth cut', { timeout: 35000 });
 
 </script>
diff --git a/tests/wpt/tests/navigation-api/commit-behavior/after-transition-traverse.html b/tests/wpt/tests/navigation-api/commit-behavior/after-transition-traverse.html
index 7dd1226e54c..d348a218ac4 100644
--- a/tests/wpt/tests/navigation-api/commit-behavior/after-transition-traverse.html
+++ b/tests/wpt/tests/navigation-api/commit-behavior/after-transition-traverse.html
@@ -5,11 +5,13 @@
 <script src="resources/after-transition-commit-helpers.js"></script>
 <body>
 <script>
+let start_index = navigation.currentEntry.index;
+
 let tests = [
-  { mode: "rejectBeforeCommit",      destinationIndex: 0, description: "{ commit: 'after-transition' } for a traverse navigation, reject before commit" },
-  { mode: "rejectAfterCommit",       destinationIndex: 1, description: "{ commit: 'after-transition' } for a traverse navigation, reject after commit" },
-  { mode: "successExplicitCommit",   destinationIndex: 2, description: "{ commit: 'after-transition' } for a traverse navigation, explicit commit()" },
-  { mode: "successNoExplicitCommit", destinationIndex: 3, description: "{ commit: 'after-transition' } for a traverse navigation, commit when handler resolves" }
+  { mode: "rejectBeforeCommit",      destinationIndex: start_index, description: "{ commit: 'after-transition' } for a traverse navigation, reject before commit" },
+  { mode: "rejectAfterCommit",       destinationIndex: start_index + 1, description: "{ commit: 'after-transition' } for a traverse navigation, reject after commit" },
+  { mode: "successExplicitCommit",   destinationIndex: start_index + 2, description: "{ commit: 'after-transition' } for a traverse navigation, explicit commit()" },
+  { mode: "successNoExplicitCommit", destinationIndex: start_index + 3, description: "{ commit: 'after-transition' } for a traverse navigation, commit when handler resolves" }
 ];
 
 // Push a bunch of history entries so each test case can target a unique entry.
diff --git a/tests/wpt/tests/navigation-api/currententrychange-event/anchor-click.html b/tests/wpt/tests/navigation-api/currententrychange-event/anchor-click.html
index e0bf91166aa..ce8fc69f5d4 100644
--- a/tests/wpt/tests/navigation-api/currententrychange-event/anchor-click.html
+++ b/tests/wpt/tests/navigation-api/currententrychange-event/anchor-click.html
@@ -4,13 +4,15 @@
 <a id="a" href="#foo"></a>
 <script>
 test(t => {
+  let start_index = navigation.currentEntry.index;
+
   let oncurrententrychange_called = false;
   navigation.oncurrententrychange = t.step_func(e => {
     oncurrententrychange_called = true;
-    assert_equals(e.from, navigation.entries()[0]);
-    assert_equals(e.from.index, 0);
+    assert_equals(e.from, navigation.entries()[start_index]);
+    assert_equals(e.from.index, start_index);
     assert_equals(e.navigationType, "push");
-    assert_equals(navigation.currentEntry.index, 1);
+    assert_equals(navigation.currentEntry.index, start_index + 1);
   });
   a.click();
   assert_true(oncurrententrychange_called);
diff --git a/tests/wpt/tests/navigation-api/currententrychange-event/history-back-same-doc.html b/tests/wpt/tests/navigation-api/currententrychange-event/history-back-same-doc.html
index 768805b7526..885d558bb5d 100644
--- a/tests/wpt/tests/navigation-api/currententrychange-event/history-back-same-doc.html
+++ b/tests/wpt/tests/navigation-api/currententrychange-event/history-back-same-doc.html
@@ -3,18 +3,21 @@
 <script src="/resources/testharnessreport.js"></script>
 <script>
 promise_test(async t => {
+  let start_length = navigation.entries().length;
+  let start_index = navigation.currentEntry.index;
+
   // Wait for after the load event so that the navigation doesn't get converted
   // into a replace navigation.
   await new Promise(resolve => window.onload = () => t.step_timeout(resolve, 0));
   await navigation.navigate("#foo");
-  assert_equals(navigation.entries().length, 2);
+  assert_equals(navigation.entries().length, start_length + 1);
 
   let oncurrententrychange_called = false;
   navigation.oncurrententrychange = t.step_func(e => {
     oncurrententrychange_called = true;
-    assert_equals(e.from, navigation.entries()[1]);
+    assert_equals(e.from, navigation.entries()[start_index + 1]);
     assert_equals(e.navigationType, "traverse");
-    assert_equals(navigation.currentEntry.index, 0);
+    assert_equals(navigation.currentEntry.index, start_index);
   });
   history.back();
   assert_false(oncurrententrychange_called);
diff --git a/tests/wpt/tests/navigation-api/currententrychange-event/history-pushState.html b/tests/wpt/tests/navigation-api/currententrychange-event/history-pushState.html
index 1a17a7cec0c..cfefcda1d6a 100644
--- a/tests/wpt/tests/navigation-api/currententrychange-event/history-pushState.html
+++ b/tests/wpt/tests/navigation-api/currententrychange-event/history-pushState.html
@@ -3,12 +3,14 @@
 <script src="/resources/testharnessreport.js"></script>
 <script>
 test(t => {
+  let start_index = navigation.currentEntry.index;
+
   let oncurrententrychange_called = false;
   navigation.oncurrententrychange = t.step_func(e => {
     oncurrententrychange_called = true;
-    assert_equals(e.from, navigation.entries()[0]);
+    assert_equals(e.from, navigation.entries()[start_index]);
     assert_equals(e.navigationType, "push");
-    assert_equals(navigation.currentEntry.index, 1);
+    assert_equals(navigation.currentEntry.index, start_index + 1);
   });
   history.pushState(1, "", "#1");
   assert_true(oncurrententrychange_called);
diff --git a/tests/wpt/tests/navigation-api/currententrychange-event/history-replaceState.html b/tests/wpt/tests/navigation-api/currententrychange-event/history-replaceState.html
index e8ae8ee57a2..5b6fc09bf94 100644
--- a/tests/wpt/tests/navigation-api/currententrychange-event/history-replaceState.html
+++ b/tests/wpt/tests/navigation-api/currententrychange-event/history-replaceState.html
@@ -3,6 +3,8 @@
 <script src="/resources/testharnessreport.js"></script>
 <script>
 test(t => {
+  let start_index = navigation.currentEntry.index;
+
   let oncurrententrychange_called = false;
   let original_currentEntry = navigation.currentEntry;
   navigation.oncurrententrychange = t.step_func(e => {
@@ -10,7 +12,7 @@ test(t => {
     assert_equals(e.from, original_currentEntry);
     assert_equals(e.from.index, -1);
     assert_equals(e.navigationType, "replace");
-    assert_equals(navigation.currentEntry.index, 0);
+    assert_equals(navigation.currentEntry.index, start_index);
   });
   history.replaceState(1, "", "#1");
   assert_true(oncurrententrychange_called);
diff --git a/tests/wpt/tests/navigation-api/currententrychange-event/location-api.html b/tests/wpt/tests/navigation-api/currententrychange-event/location-api.html
index 88ebd985a1e..b142fabb227 100644
--- a/tests/wpt/tests/navigation-api/currententrychange-event/location-api.html
+++ b/tests/wpt/tests/navigation-api/currententrychange-event/location-api.html
@@ -3,6 +3,8 @@
 <script src="/resources/testharnessreport.js"></script>
 <script>
 test(t => {
+  let start_index = navigation.currentEntry.index;
+
   let oncurrententrychange_called = false;
   let original_entry = navigation.currentEntry;
   navigation.oncurrententrychange = t.step_func(e => {
@@ -10,7 +12,7 @@ test(t => {
     assert_equals(e.from, original_entry);
     assert_equals(e.from.index, -1);
     assert_equals(e.navigationType, "replace");
-    assert_equals(navigation.currentEntry.index, 0);
+    assert_equals(navigation.currentEntry.index, start_index);
   });
   location.hash = "#foo";
   assert_true(oncurrententrychange_called);
diff --git a/tests/wpt/tests/navigation-api/currententrychange-event/navigation-back-forward-same-doc.html b/tests/wpt/tests/navigation-api/currententrychange-event/navigation-back-forward-same-doc.html
index 8182673aa59..cd307a3d538 100644
--- a/tests/wpt/tests/navigation-api/currententrychange-event/navigation-back-forward-same-doc.html
+++ b/tests/wpt/tests/navigation-api/currententrychange-event/navigation-back-forward-same-doc.html
@@ -3,19 +3,22 @@
 <script src="/resources/testharnessreport.js"></script>
 <script>
 promise_test(async t => {
+  let start_length = navigation.entries().length;
+  let start_index = navigation.currentEntry.index;
+
   // Wait for after the load event so that the navigation doesn't get converted
   // into a replace navigation.
   await new Promise(resolve => window.onload = () => t.step_timeout(resolve, 0));
   await navigation.navigate("#foo").committed;
-  assert_equals(navigation.entries().length, 2);
+  assert_equals(navigation.entries().length, start_length + 1);
 
   let oncurrententrychange_back_called = false;
   let back_committed = false;
   navigation.oncurrententrychange = t.step_func(e => {
     oncurrententrychange_back_called = true;
-    assert_equals(e.from, navigation.entries()[1]);
+    assert_equals(e.from, navigation.entries()[start_index + 1]);
     assert_equals(e.navigationType, "traverse");
-    assert_equals(navigation.currentEntry.index, 0);
+    assert_equals(navigation.currentEntry.index, start_index);
     assert_false(back_committed);
   });
   let back_result = navigation.back();
@@ -27,9 +30,9 @@ promise_test(async t => {
   let forward_committed = false;
   navigation.oncurrententrychange = t.step_func(e => {
     oncurrententrychange_forward_called = true;
-    assert_equals(e.from, navigation.entries()[0]);
+    assert_equals(e.from, navigation.entries()[start_index]);
     assert_equals(e.navigationType, "traverse");
-    assert_equals(navigation.currentEntry.index, 1);
+    assert_equals(navigation.currentEntry.index, start_index + 1);
     assert_false(forward_committed);
   });
   let forward_result = navigation.forward();
diff --git a/tests/wpt/tests/navigation-api/currententrychange-event/navigation-navigate-replace-same-doc.html b/tests/wpt/tests/navigation-api/currententrychange-event/navigation-navigate-replace-same-doc.html
index f9935973057..79ade9396f3 100644
--- a/tests/wpt/tests/navigation-api/currententrychange-event/navigation-navigate-replace-same-doc.html
+++ b/tests/wpt/tests/navigation-api/currententrychange-event/navigation-navigate-replace-same-doc.html
@@ -3,6 +3,8 @@
 <script src="/resources/testharnessreport.js"></script>
 <script>
 promise_test(async t => {
+  let start_index = navigation.currentEntry.index;
+
   // Wait for after the load event so that the navigation doesn't get converted
   // into a replace navigation.
   await new Promise(resolve => window.onload = () => t.step_timeout(resolve, 0));
@@ -14,7 +16,7 @@ promise_test(async t => {
     assert_equals(e.from, original_entry);
     assert_equals(e.from.index, -1);
     assert_equals(e.navigationType, "replace");
-    assert_equals(navigation.currentEntry.index, 0);
+    assert_equals(navigation.currentEntry.index, start_index);
   });
   let result = navigation.navigate("#foo", { history: "replace" });
   assert_true(oncurrententrychange_called);
diff --git a/tests/wpt/tests/navigation-api/currententrychange-event/navigation-navigate-same-doc.html b/tests/wpt/tests/navigation-api/currententrychange-event/navigation-navigate-same-doc.html
index 87fc28d174a..0cf5214eae6 100644
--- a/tests/wpt/tests/navigation-api/currententrychange-event/navigation-navigate-same-doc.html
+++ b/tests/wpt/tests/navigation-api/currententrychange-event/navigation-navigate-same-doc.html
@@ -3,6 +3,8 @@
 <script src="/resources/testharnessreport.js"></script>
 <script>
 promise_test(async t => {
+  let start_index = navigation.currentEntry.index;
+
   // Wait for after the load event so that the navigation doesn't get converted
   // into a replace navigation.
   await new Promise(resolve => window.onload = () => t.step_timeout(resolve, 0));
@@ -10,9 +12,9 @@ promise_test(async t => {
   let oncurrententrychange_called = false;
   navigation.oncurrententrychange = t.step_func(e => {
     oncurrententrychange_called = true;
-    assert_equals(e.from, navigation.entries()[0]);
+    assert_equals(e.from, navigation.entries()[start_index]);
     assert_equals(e.navigationType, "push");
-    assert_equals(navigation.currentEntry.index, 1);
+    assert_equals(navigation.currentEntry.index, start_index + 1);
   });
   let result = navigation.navigate("#foo");
   assert_true(oncurrententrychange_called);
diff --git a/tests/wpt/tests/navigation-api/navigation-history-entry/current-basic.html b/tests/wpt/tests/navigation-api/navigation-history-entry/current-basic.html
index 78bbbb05607..66a7100bf6d 100644
--- a/tests/wpt/tests/navigation-api/navigation-history-entry/current-basic.html
+++ b/tests/wpt/tests/navigation-api/navigation-history-entry/current-basic.html
@@ -4,7 +4,9 @@
 <script src="resources/is_uuid.js"></script>
 <script>
 test(() => {
+  let start_length = navigation.entries().length;
   let first_entry = navigation.currentEntry;
+  let start_index = first_entry.index;
   assert_not_equals(first_entry, null);
   assert_not_equals(first_entry.key, null);
   assert_true(isUUID(first_entry.key));
@@ -12,8 +14,8 @@ test(() => {
   assert_true(isUUID(first_entry.id));
   assert_equals(first_entry.url, location.href);
   assert_true(first_entry.sameDocument);
-  assert_equals(navigation.entries().length, 1);
-  assert_equals(first_entry, navigation.entries()[0]);
+  assert_equals(navigation.entries().length, start_length);
+  assert_equals(first_entry, navigation.entries()[start_index]);
 
   history.replaceState(2, "", "#2");
   let second_entry = navigation.currentEntry;
@@ -24,8 +26,8 @@ test(() => {
   assert_true(isUUID(second_entry.id));
   assert_equals(second_entry.url, location.href);
   assert_true(second_entry.sameDocument);
-  assert_equals(navigation.entries().length, 1);
-  assert_equals(second_entry, navigation.entries()[0]);
+  assert_equals(navigation.entries().length, start_length);
+  assert_equals(second_entry, navigation.entries()[start_index]);
 
   history.pushState(3, "", "#3");
   let third_entry = navigation.currentEntry;
@@ -36,8 +38,8 @@ test(() => {
   assert_true(isUUID(third_entry.id));
   assert_equals(third_entry.url, location.href);
   assert_true(third_entry.sameDocument);
-  assert_equals(navigation.entries().length, 2);
-  assert_equals(third_entry, navigation.entries()[1]);
+  assert_equals(navigation.entries().length, start_length + 1);
+  assert_equals(third_entry, navigation.entries()[start_index + 1]);
 
   history.pushState(4, "");
   let fourth_entry = navigation.currentEntry;
@@ -48,8 +50,8 @@ test(() => {
   assert_true(isUUID(fourth_entry.id));
   assert_equals(fourth_entry.url, third_entry.url);
   assert_true(fourth_entry.sameDocument);
-  assert_equals(navigation.entries().length, 3);
-  assert_equals(fourth_entry, navigation.entries()[2]);
+  assert_equals(navigation.entries().length, start_length + 2);
+  assert_equals(fourth_entry, navigation.entries()[start_index + 2]);
 
   history.replaceState(5, "");
   let fifth_entry = navigation.currentEntry;
@@ -60,8 +62,8 @@ test(() => {
   assert_true(isUUID(fifth_entry.id));
   assert_equals(fifth_entry.url, fourth_entry.url);
   assert_true(fifth_entry.sameDocument);
-  assert_equals(navigation.entries().length, 3);
-  assert_equals(fifth_entry, navigation.entries()[2]);
+  assert_equals(navigation.entries().length, start_length + 2);
+  assert_equals(fifth_entry, navigation.entries()[start_index + 2]);
 
   history.pushState(5, "");
   let fifth_entry_after_push = navigation.currentEntry;
@@ -72,8 +74,8 @@ test(() => {
   assert_true(isUUID(fifth_entry_after_push.id));
   assert_equals(fifth_entry_after_push.url, fifth_entry.url);
   assert_true(fifth_entry_after_push.sameDocument);
-  assert_equals(navigation.entries().length, 4);
-  assert_equals(fifth_entry_after_push, navigation.entries()[3]);
+  assert_equals(navigation.entries().length, start_length + 3);
+  assert_equals(fifth_entry_after_push, navigation.entries()[start_index + 3]);
 
   history.replaceState(5, "");
   let fifth_entry_after_replace = navigation.currentEntry;
@@ -84,8 +86,8 @@ test(() => {
   assert_true(isUUID(fifth_entry_after_replace.id));
   assert_equals(fifth_entry_after_replace.url, fifth_entry_after_push.url);
   assert_true(fifth_entry_after_replace.sameDocument);
-  assert_equals(navigation.entries().length, 4);
-  assert_equals(fifth_entry_after_replace, navigation.entries()[3]);
+  assert_equals(navigation.entries().length, start_length + 3);
+  assert_equals(fifth_entry_after_replace, navigation.entries()[start_index + 3]);
 
   location.hash = "6";
   let sixth_entry = navigation.currentEntry;
@@ -96,8 +98,8 @@ test(() => {
   assert_true(isUUID(sixth_entry.id));
   assert_not_equals(sixth_entry.url, fifth_entry_after_replace.url);
   assert_true(sixth_entry.sameDocument);
-  assert_equals(navigation.entries().length, 4);
-  assert_equals(sixth_entry, navigation.entries()[3]);
+  assert_equals(navigation.entries().length, start_length + 3);
+  assert_equals(sixth_entry, navigation.entries()[start_index + 3]);
 
   navigation.entries().forEach(entry => {
     assert_true(isUUID(entry.id));
diff --git a/tests/wpt/tests/navigation-api/navigation-history-entry/entries-after-navigations-in-multiple-windows.html b/tests/wpt/tests/navigation-api/navigation-history-entry/entries-after-navigations-in-multiple-windows.html
index d1d4d86eb38..8cba4c80b7e 100644
--- a/tests/wpt/tests/navigation-api/navigation-history-entry/entries-after-navigations-in-multiple-windows.html
+++ b/tests/wpt/tests/navigation-api/navigation-history-entry/entries-after-navigations-in-multiple-windows.html
@@ -5,6 +5,7 @@
 <iframe id="i" src="/common/blank.html"></iframe>
 <script>
 async_test(t => {
+  let start_index = navigation.currentEntry.index;
   // The navigations in each window should have only added an navigation to
   // their own window.
   function assertExpectedEntries(entries, expected_url) {
@@ -25,7 +26,7 @@ async_test(t => {
   window.onload = () => t.step_timeout(t.step_func(() => {
     location.hash = "#1";
     i.onload = t.step_func_done(() => {
-      assertExpectedEntries(navigation.entries(), location.href);
+      assertExpectedEntries(navigation.entries().slice(start_index), location.href);
       assertExpectedEntries(i.contentWindow.navigation.entries(), i.contentWindow.location.href);
     });
     i.contentWindow.location = "/common/blank.html?2";
diff --git a/tests/wpt/tests/navigation-api/navigation-history-entry/entries-when-inactive.html b/tests/wpt/tests/navigation-api/navigation-history-entry/entries-when-inactive.html
index c70b6d8bf87..1130f69800f 100644
--- a/tests/wpt/tests/navigation-api/navigation-history-entry/entries-when-inactive.html
+++ b/tests/wpt/tests/navigation-api/navigation-history-entry/entries-when-inactive.html
@@ -3,14 +3,15 @@
 <script src="/resources/testharnessreport.js"></script>
 <script>
 async_test(t => {
-  const first_entry = navigation.entries()[0];
+  let start_index = navigation.currentEntry.index;
+  const first_entry = navigation.entries()[start_index];
   history.pushState(1, "", "#1");
-  assert_equals(navigation.entries()[0], first_entry);
+  assert_equals(navigation.entries()[start_index], first_entry);
   history.back();
   window.onpopstate = t.step_func_done(() => {
-    const second_entry = navigation.entries()[1];
+    const second_entry = navigation.entries()[start_index + 1];
     history.replaceState(0, "", "#0");
-    assert_equals(navigation.entries()[1], second_entry);
+    assert_equals(navigation.entries()[start_index + 1], second_entry);
   });
 }, "A non-active entry in navigation.entries() should not be modified when a different entry is modified");
 </script>
diff --git a/tests/wpt/tests/navigation-api/navigation-history-entry/index-not-in-entries.html b/tests/wpt/tests/navigation-api/navigation-history-entry/index-not-in-entries.html
index a16d130ba16..021848f1a3e 100644
--- a/tests/wpt/tests/navigation-api/navigation-history-entry/index-not-in-entries.html
+++ b/tests/wpt/tests/navigation-api/navigation-history-entry/index-not-in-entries.html
@@ -4,12 +4,14 @@
 <iframe id="i" src="/common/blank.html"></iframe>
 <script>
 async_test(t => {
+  let start_index = navigation.currentEntry.index;
+
   // Wait for after the load event so that the navigation doesn't get converted
   // into a replace navigation.
   window.onload = () => t.step_timeout(t.step_func_done(() => {
     // Remove the entry by replacing it.
     let replaced_entry = navigation.currentEntry;
-    assert_equals(replaced_entry.index, 0);
+    assert_equals(replaced_entry.index, start_index);
     navigation.navigate("#0", { history: "replace" });
     assert_equals(replaced_entry.index, -1);
 
diff --git a/tests/wpt/tests/navigation-api/navigation-history-entry/key-id-back-cross-document.html b/tests/wpt/tests/navigation-api/navigation-history-entry/key-id-back-cross-document.html
index 2dd58c03e9d..efede38ab31 100644
--- a/tests/wpt/tests/navigation-api/navigation-history-entry/key-id-back-cross-document.html
+++ b/tests/wpt/tests/navigation-api/navigation-history-entry/key-id-back-cross-document.html
@@ -4,12 +4,13 @@
 <iframe id="i" src="resources/key-navigate-back-cross-document-helper.html"></iframe>
 <script>
 async_test(t => {
+  let start_length = navigation.entries().length;
   window.finish = t.step_func_done((end_key, end_id) => {
     assert_equals(window.start_key, end_key);
     assert_equals(window.start_id, end_id);
     // The new history entry in the iframe should not add any entries to
     // this window's navigation.
-    assert_equals(navigation.entries().length, 1);
+    assert_equals(navigation.entries().length, start_length);
   });
 }, "NavigationHistoryEntry's key and id on cross-document back navigation");
 </script>
diff --git a/tests/wpt/tests/navigation-api/navigation-history-entry/key-id-back-same-document.html b/tests/wpt/tests/navigation-api/navigation-history-entry/key-id-back-same-document.html
index 858b5fd2c89..d3c0252fdbb 100644
--- a/tests/wpt/tests/navigation-api/navigation-history-entry/key-id-back-same-document.html
+++ b/tests/wpt/tests/navigation-api/navigation-history-entry/key-id-back-same-document.html
@@ -3,21 +3,22 @@
 <script src="/resources/testharnessreport.js"></script>
 <script>
 async_test(t => {
+  let start_length = navigation.entries().length;
+  let start_index = navigation.currentEntry.index;
   let key = navigation.currentEntry.key;
   let id = navigation.currentEntry.id;
-  assert_equals(navigation.entries().length, 1);
 
   history.pushState("hash", "", "#hash");
   assert_not_equals(key, navigation.currentEntry.key);
   assert_not_equals(id, navigation.currentEntry.id);
-  assert_equals(navigation.entries().length, 2);
-  assert_equals(navigation.currentEntry.index, 1);
+  assert_equals(navigation.entries().length, start_length + 1);
+  assert_equals(navigation.currentEntry.index, start_index + 1);
 
   window.onpopstate = t.step_func_done(() => {
     assert_equals(key, navigation.currentEntry.key);
     assert_equals(id, navigation.currentEntry.id);
-    assert_equals(navigation.entries().length, 2);
-    assert_equals(navigation.currentEntry.index, 0);
+    assert_equals(navigation.entries().length, start_length + 1);
+    assert_equals(navigation.currentEntry.index, start_index);
   });
   history.back();
 }, "NavigationHistoryEntry's key and id on same-document back navigation");
diff --git a/tests/wpt/tests/navigation-api/navigation-history-entry/key-id-location-reload.html b/tests/wpt/tests/navigation-api/navigation-history-entry/key-id-location-reload.html
index f950e2f3a21..aacd8a28598 100644
--- a/tests/wpt/tests/navigation-api/navigation-history-entry/key-id-location-reload.html
+++ b/tests/wpt/tests/navigation-api/navigation-history-entry/key-id-location-reload.html
@@ -4,6 +4,7 @@
 <iframe id="i" src="/common/blank.html"></iframe>
 <script>
 async_test(t => {
+  let start_length = navigation.entries().length;
   window.onload = t.step_func(() => {
     let key = i.contentWindow.navigation.currentEntry.key;
     let id = i.contentWindow.navigation.currentEntry.id;
@@ -11,7 +12,7 @@ async_test(t => {
     i.onload = t.step_func_done(() => {
       assert_equals(key, i.contentWindow.navigation.currentEntry.key);
       assert_equals(id, i.contentWindow.navigation.currentEntry.id);
-      assert_equals(navigation.entries().length, 1);
+      assert_equals(navigation.entries().length, start_length);
     });
   });
 }, "NavigationHistoryEntry's key and id after location.reload()");
diff --git a/tests/wpt/tests/navigation-api/navigation-history-entry/key-id-location-replace.html b/tests/wpt/tests/navigation-api/navigation-history-entry/key-id-location-replace.html
index a58772a7f47..d741049c44d 100644
--- a/tests/wpt/tests/navigation-api/navigation-history-entry/key-id-location-replace.html
+++ b/tests/wpt/tests/navigation-api/navigation-history-entry/key-id-location-replace.html
@@ -4,6 +4,7 @@
 <iframe id="i" src="/common/blank.html"></iframe>
 <script>
 async_test(t => {
+  let start_length = navigation.entries().length;
   window.onload = t.step_func(() => {
     let key = i.contentWindow.navigation.currentEntry.key;
     let id = i.contentWindow.navigation.currentEntry.id;
@@ -11,7 +12,7 @@ async_test(t => {
     i.onload = t.step_func_done(() => {
       assert_equals(key, i.contentWindow.navigation.currentEntry.key);
       assert_not_equals(id, i.contentWindow.navigation.currentEntry.id);
-      assert_equals(navigation.entries().length, 1);
+      assert_equals(navigation.entries().length, start_length);
     });
   });
 }, "NavigationHistoryEntry's key and id after location.replace()");
diff --git a/tests/wpt/tests/navigation-api/navigation-history-entry/sameDocument-after-fragment-navigate.html b/tests/wpt/tests/navigation-api/navigation-history-entry/sameDocument-after-fragment-navigate.html
index a197f825d8e..1c0cd6e8253 100644
--- a/tests/wpt/tests/navigation-api/navigation-history-entry/sameDocument-after-fragment-navigate.html
+++ b/tests/wpt/tests/navigation-api/navigation-history-entry/sameDocument-after-fragment-navigate.html
@@ -3,6 +3,9 @@
 <script src="/resources/testharnessreport.js"></script>
 <script>
 async_test(t => {
+  let start_length = navigation.entries().length;
+  let start_index = navigation.currentEntry.index;
+
   // Wait for after the load event so that the navigation doesn't get converted
   // into a replace navigation.
   window.onload = () => t.step_timeout(t.step_func_done(() => {
@@ -21,10 +24,10 @@ async_test(t => {
     assert_true(entry1.sameDocument);
     assert_true(entry2.sameDocument);
 
-    assert_equals(navigation.entries().length, 3);
-    assert_equals(navigation.entries()[0], entry1);
-    assert_equals(navigation.entries()[1], entry2);
-    assert_equals(navigation.entries()[2], entry3);
+    assert_equals(navigation.entries().length, start_length + 2);
+    assert_equals(navigation.entries()[start_index], entry1);
+    assert_equals(navigation.entries()[start_index + 1], entry2);
+    assert_equals(navigation.entries()[start_index + 2], entry3);
   }), 0);
 }, "entry.sameDocument after same-document navigations");
 </script>
diff --git a/tests/wpt/tests/navigation-api/ordering-and-transition/currententrychange-before-popstate-intercept.html b/tests/wpt/tests/navigation-api/ordering-and-transition/currententrychange-before-popstate-intercept.html
index c51c7c444cb..10627c58754 100644
--- a/tests/wpt/tests/navigation-api/ordering-and-transition/currententrychange-before-popstate-intercept.html
+++ b/tests/wpt/tests/navigation-api/ordering-and-transition/currententrychange-before-popstate-intercept.html
@@ -3,11 +3,12 @@
 <script src="/resources/testharnessreport.js"></script>
 <script>
 promise_test(async t => {
+  let start_length = navigation.entries().length;
   // Wait for after the load event so that the navigation doesn't get converted
   // into a replace navigation.
   await new Promise(resolve => window.onload = () => t.step_timeout(resolve, 0));
   await navigation.navigate("#foo").committed;
-  assert_equals(navigation.entries().length, 2);
+  assert_equals(navigation.entries().length, start_length + 1);
 
   navigation.onnavigate = e => e.intercept();
 
diff --git a/tests/wpt/tests/navigation-api/ordering-and-transition/currententrychange-dispose-ordering.html b/tests/wpt/tests/navigation-api/ordering-and-transition/currententrychange-dispose-ordering.html
index 4ca9ba29800..ecca39e6a0a 100644
--- a/tests/wpt/tests/navigation-api/ordering-and-transition/currententrychange-dispose-ordering.html
+++ b/tests/wpt/tests/navigation-api/ordering-and-transition/currententrychange-dispose-ordering.html
@@ -3,6 +3,7 @@
 <script src="/resources/testharnessreport.js"></script>
 <script>
 test(t => {
+  let start_index = navigation.currentEntry.index;
   let oncurrententrychange_called = false;
   let ondispose_called = false;
 
@@ -17,7 +18,7 @@ test(t => {
     assert_equals(e.from, original_entry);
     assert_equals(e.from.index, -1);
     assert_equals(e.navigationType, "replace");
-    assert_equals(navigation.currentEntry.index, 0);
+    assert_equals(navigation.currentEntry.index, start_index);
   });
   navigation.navigate("#foo", { history: "replace" });
   assert_true(oncurrententrychange_called);
diff --git a/tests/wpt/tests/navigation-api/per-entry-events/dispose-for-full-session-history.tentative.html b/tests/wpt/tests/navigation-api/per-entry-events/dispose-for-full-session-history.tentative.html
index 9bed225cf36..6f5007ac569 100644
--- a/tests/wpt/tests/navigation-api/per-entry-events/dispose-for-full-session-history.tentative.html
+++ b/tests/wpt/tests/navigation-api/per-entry-events/dispose-for-full-session-history.tentative.html
@@ -6,9 +6,8 @@ promise_test(async (t) => {
   // Wait for after the load event so that the navigation doesn't get converted
   // into a replace navigation.
   await new Promise(r => window.onload = () => t.step_timeout(r, 0));
-  assert_equals(navigation.entries().length, 1);
 
-  let dispose_promise = new Promise(r => navigation.entries()[0].ondispose = r);
+  let dispose_promise = new Promise(r => navigation.currentEntry.ondispose = r);
 
   // There is no spec for the maximum number of joint session history entries
   // (hence this is a .tentative.html test). However, all(?) browsers have a
diff --git a/tests/wpt/tests/navigation-api/per-entry-events/dispose-for-navigation-in-child.html b/tests/wpt/tests/navigation-api/per-entry-events/dispose-for-navigation-in-child.html
index 24828770852..d351fad6c08 100644
--- a/tests/wpt/tests/navigation-api/per-entry-events/dispose-for-navigation-in-child.html
+++ b/tests/wpt/tests/navigation-api/per-entry-events/dispose-for-navigation-in-child.html
@@ -7,20 +7,22 @@ promise_test(async (t) => {
   // Wait for after the load event so that the navigation doesn't get converted
   // into a replace navigation.
   await new Promise(r => window.onload = () => t.step_timeout(r, 0));
+  let start_length = navigation.entries().length;
+  let start_index = navigation.currentEntry.index;
 
   await iframe.contentWindow.navigation.navigate("#a");
   await navigation.navigate("#1").finished;
   await navigation.navigate("#2").finished;
   await navigation.navigate("#3").finished;
   await iframe.contentWindow.navigation.back().finished;
-  assert_equals(navigation.entries().length, 4);
+  assert_equals(navigation.entries().length, start_length + 3);
   assert_equals(iframe.contentWindow.navigation.entries().length, 2);
-  assert_equals(navigation.currentEntry.index, 0);
+  assert_equals(navigation.currentEntry.index, start_index);
   assert_equals(iframe.contentWindow.navigation.currentEntry.index, 0);
 
-  let top_entry_0_before = navigation.entries()[0];
+  let top_entry_0_before = navigation.entries()[start_index];
   let dispose_promises = [];
-  for (let i = 1; i < navigation.entries().length; i++) {
+  for (let i = start_index + 1; i < navigation.entries().length; i++) {
     dispose_promises.push(new Promise(r => navigation.entries()[i].ondispose = r))
   }
 
@@ -31,11 +33,11 @@ promise_test(async (t) => {
   // top window should have dispose events, even though that wasn't the window
   // that navigated.
   await Promise.all(dispose_promises);
-  assert_equals(navigation.entries().length, 1);
+  assert_equals(navigation.entries().length, start_length);
   assert_equals(iframe.contentWindow.navigation.entries().length, 2);
-  assert_equals(navigation.currentEntry.index, 0);
+  assert_equals(navigation.currentEntry.index, start_index);
   assert_equals(iframe.contentWindow.navigation.currentEntry.index, 1);
-  assert_equals(navigation.entries()[0], top_entry_0_before);
+  assert_equals(navigation.entries()[start_index], top_entry_0_before);
 
 }, "Dispose events should fire when entries are removed by a navigation in a different frame");
 </script>
diff --git a/tests/wpt/tests/navigation-api/per-entry-events/dispose-same-document-intercept.html b/tests/wpt/tests/navigation-api/per-entry-events/dispose-same-document-intercept.html
index 44aa096aafe..862e01127be 100644
--- a/tests/wpt/tests/navigation-api/per-entry-events/dispose-same-document-intercept.html
+++ b/tests/wpt/tests/navigation-api/per-entry-events/dispose-same-document-intercept.html
@@ -6,13 +6,15 @@ promise_test(async (t) => {
   // Wait for after the load event so that the navigation doesn't get converted
   // into a replace navigation.
   await new Promise(r => window.onload = () => t.step_timeout(r, 0));
+  let start_length = navigation.entries().length;
+  let start_index = navigation.currentEntry.index;
 
   location.hash = "#1";
   location.hash = "#2";
   location.hash = "#3";
 
-  assert_equals(navigation.entries().length, 4);
-  const [entry0, entry1, entry2, entry3] = navigation.entries();
+  assert_equals(navigation.entries().length, start_length + 3);
+  const [entry0, entry1, entry2, entry3] = navigation.entries().slice(start_index);
   assert_equals((new URL(entry2.url)).hash, "#2");
   assert_equals((new URL(entry3.url)).hash, "#3");
 
@@ -26,7 +28,7 @@ promise_test(async (t) => {
     assert_equals(e.composed, false);
 
     assert_array_equals(
-      navigation.entries(),
+      navigation.entries().slice(start_index),
       [entry0, entry1, navigation.currentEntry],
       "entries() is updated during dispose for entry 2");
     assert_not_equals(navigation.currentEntry, entry1, "current entry must be updated during dispose for entry 3");
@@ -41,7 +43,7 @@ promise_test(async (t) => {
     assert_true(dispose2Called, "dispose for entry 2 must have happened before entry 3");
 
     assert_array_equals(
-      navigation.entries(),
+      navigation.entries().slice(start_index),
       [entry0, entry1, navigation.currentEntry],
       "entries() is updated during dispose for entry 3");
     assert_not_equals(navigation.currentEntry, entry1, "current entry must be updated during dispose for entry 3");
@@ -60,8 +62,8 @@ promise_test(async (t) => {
 
   navigation.navigate("#fork");
 
-  assert_equals(navigation.entries().length, 3);
-  const [finalEntry0, finalEntry1, finalEntry2] = navigation.entries();
+  assert_equals(navigation.entries().length, start_length + 2);
+  const [finalEntry0, finalEntry1, finalEntry2] = navigation.entries().slice(start_index);
   assert_equals(finalEntry0, entry0);
   assert_equals(finalEntry1, entry1);
   assert_not_equals(finalEntry2, entry2);
diff --git a/tests/wpt/tests/navigation-api/per-entry-events/dispose-same-document-navigate-during.html b/tests/wpt/tests/navigation-api/per-entry-events/dispose-same-document-navigate-during.html
index 59d9b3cce39..88eb35c225f 100644
--- a/tests/wpt/tests/navigation-api/per-entry-events/dispose-same-document-navigate-during.html
+++ b/tests/wpt/tests/navigation-api/per-entry-events/dispose-same-document-navigate-during.html
@@ -6,13 +6,15 @@ promise_test(async (t) => {
   // Wait for after the load event so that the navigation doesn't get converted
   // into a replace navigation.
   await new Promise(r => window.onload = () => t.step_timeout(r, 0));
+  let start_length = navigation.entries().length;
+  let start_index = navigation.currentEntry.index;
 
   location.hash = "#1";
   location.hash = "#2";
   location.hash = "#3";
 
-  assert_equals(navigation.entries().length, 4);
-  const [entry0, entry1, entry2, entry3] = navigation.entries();
+  assert_equals(navigation.entries().length, start_length + 3);
+  const [entry0, entry1, entry2, entry3] = navigation.entries().slice(start_index);
   assert_equals((new URL(entry2.url)).hash, "#2");
   assert_equals((new URL(entry3.url)).hash, "#3");
 
@@ -37,8 +39,8 @@ promise_test(async (t) => {
 
   assert_equals(dispose3Called, 1, "dispose for entry 3 must happen exactly once (final check)");
 
-  assert_equals(navigation.entries().length, 4);
-  const [finalEntry0, finalEntry1, finalEntry2, finalEntry3] = navigation.entries();
+  assert_equals(navigation.entries().length, start_length + 3);
+  const [finalEntry0, finalEntry1, finalEntry2, finalEntry3] = navigation.entries().slice(start_index);
   assert_equals(finalEntry0, entry0);
   assert_equals(finalEntry1, entry1);
   assert_not_equals(finalEntry2, entry2);
diff --git a/tests/wpt/tests/navigation-api/per-entry-events/dispose-same-document-replace-with-intercept.html b/tests/wpt/tests/navigation-api/per-entry-events/dispose-same-document-replace-with-intercept.html
index 4e492e30aed..7814543e714 100644
--- a/tests/wpt/tests/navigation-api/per-entry-events/dispose-same-document-replace-with-intercept.html
+++ b/tests/wpt/tests/navigation-api/per-entry-events/dispose-same-document-replace-with-intercept.html
@@ -8,7 +8,6 @@ promise_test(async (t) => {
   // automatically before the load event completes.
   await new Promise(r => window.onload = () => t.step_timeout(r, 0));
 
-  const entriesBefore = navigation.entries();
   const currentBefore = navigation.currentEntry;
 
   let disposeCalled = false;
@@ -21,10 +20,10 @@ promise_test(async (t) => {
     assert_equals(e.composed, false);
 
     assert_not_equals(navigation.currentEntry, currentBefore);
-    assert_array_equals(navigation.entries(), [navigation.currentEntry]);
+    assert_array_equals(navigation.entries().slice(navigation.currentEntry.index), [navigation.currentEntry]);
     assert_equals((new URL(navigation.currentEntry.url)).search, "?replacement");
     assert_equals(navigation.transition.navigationType, "replace");
-    assert_equals(navigation.transition.from, entriesBefore[0]);
+    assert_equals(navigation.transition.from, currentBefore);
     assert_equals(location.search, "?replacement");
   });
 
diff --git a/tests/wpt/tests/navigation-api/per-entry-events/dispose-same-document-replaceState.html b/tests/wpt/tests/navigation-api/per-entry-events/dispose-same-document-replaceState.html
index a6197260a28..78df25774c3 100644
--- a/tests/wpt/tests/navigation-api/per-entry-events/dispose-same-document-replaceState.html
+++ b/tests/wpt/tests/navigation-api/per-entry-events/dispose-same-document-replaceState.html
@@ -3,7 +3,8 @@
 <script src="/resources/testharnessreport.js"></script>
 <script>
 test(t => {
-  const entriesBefore = navigation.entries();
+  let start_index = navigation.currentEntry.index;
+
   const currentBefore = navigation.currentEntry;
 
   let disposeCalled = false;
@@ -16,7 +17,7 @@ test(t => {
     assert_equals(e.composed, false);
 
     assert_not_equals(navigation.currentEntry, currentBefore);
-    assert_array_equals(navigation.entries(), [navigation.currentEntry]);
+    assert_array_equals(navigation.entries().slice(start_index), [navigation.currentEntry]);
     assert_equals((new URL(navigation.currentEntry.url)).search, "?replacement");
     assert_equals(navigation.transition, null);
     assert_equals(location.search, "?replacement");
diff --git a/tests/wpt/tests/navigation-api/per-entry-events/dispose-same-document.html b/tests/wpt/tests/navigation-api/per-entry-events/dispose-same-document.html
index 27806ce3c86..e41403e773c 100644
--- a/tests/wpt/tests/navigation-api/per-entry-events/dispose-same-document.html
+++ b/tests/wpt/tests/navigation-api/per-entry-events/dispose-same-document.html
@@ -6,13 +6,15 @@ promise_test(async (t) => {
   // Wait for after the load event so that the navigation doesn't get converted
   // into a replace navigation.
   await new Promise(r => window.onload = () => t.step_timeout(r, 0));
+  let start_length = navigation.entries().length;
+  let start_index = navigation.currentEntry.index;
 
   location.hash = "#1";
   location.hash = "#2";
   location.hash = "#3";
 
-  assert_equals(navigation.entries().length, 4);
-  const [entry0, entry1, entry2, entry3] = navigation.entries();
+  assert_equals(navigation.entries().length, start_length + 3);
+  const [entry0, entry1, entry2, entry3] = navigation.entries().slice(start_index);
   assert_equals((new URL(entry2.url)).hash, "#2");
   assert_equals((new URL(entry3.url)).hash, "#3");
 
@@ -26,7 +28,7 @@ promise_test(async (t) => {
     assert_equals(e.composed, false);
 
     assert_array_equals(
-      navigation.entries(),
+      navigation.entries().slice(start_index),
       [entry0, entry1, navigation.currentEntry],
       "entries() is updated during dispose for entry 2");
     assert_not_equals(navigation.currentEntry, entry1, "current entry must be updated during dispose for entry 3");
@@ -40,7 +42,7 @@ promise_test(async (t) => {
     assert_true(dispose2Called, "dispose for entry 2 must have happened before entry 3");
 
     assert_array_equals(
-      navigation.entries(),
+      navigation.entries().slice(start_index),
       [entry0, entry1, navigation.currentEntry],
       "entries() is updated during dispose for entry 3");
     assert_not_equals(navigation.currentEntry, entry1, "current entry must be updated during dispose for entry 3");
@@ -54,8 +56,8 @@ promise_test(async (t) => {
 
   navigation.navigate("#fork");
 
-  assert_equals(navigation.entries().length, 3);
-  const [finalEntry0, finalEntry1, finalEntry2] = navigation.entries();
+  assert_equals(navigation.entries().length, start_length + 2);
+  const [finalEntry0, finalEntry1, finalEntry2] = navigation.entries().slice(start_index);
   assert_equals(finalEntry0, entry0);
   assert_equals(finalEntry1, entry1);
   assert_not_equals(finalEntry2, entry2);
diff --git a/tests/wpt/tests/navigation-api/per-entry-events/dispose-skip-current-on-truncate.html b/tests/wpt/tests/navigation-api/per-entry-events/dispose-skip-current-on-truncate.html
index 56ec4d301f9..bcf0ee3b79e 100644
--- a/tests/wpt/tests/navigation-api/per-entry-events/dispose-skip-current-on-truncate.html
+++ b/tests/wpt/tests/navigation-api/per-entry-events/dispose-skip-current-on-truncate.html
@@ -3,11 +3,14 @@
 <script src="/resources/testharnessreport.js"></script>
 <script>
 promise_test(async (t) => {
+  let start_length = navigation.entries().length;
+  let start_index = navigation.currentEntry.index;
+
   // Wait for after the load event so that the navigation doesn't get converted
   // into a replace navigation.
   await new Promise(r => window.onload = () => t.step_timeout(r, 0));
   await navigation.navigate("#1").finished;
-  assert_equals(navigation.entries().length, 2);
+  assert_equals(navigation.entries().length, start_length + 1);
 
   let iframe = document.createElement("iframe");
   iframe.src = "/common/blank.html";
@@ -19,22 +22,22 @@ promise_test(async (t) => {
   // document, but we will be at a joint session history entry that was created
   // before the iframe was added to the document.
   await navigation.back().finished;
-  assert_equals(navigation.entries().length, 2);
+  assert_equals(navigation.entries().length, start_length + 1);
   assert_equals(iframe.contentWindow.navigation.entries().length, 1);
-  assert_equals(navigation.currentEntry.index, 0);
+  assert_equals(navigation.currentEntry.index, start_index);
   assert_equals(iframe.contentWindow.navigation.currentEntry.index, 0);
 
   // A push navigation in the top window will truncate-then-push the joint
   // session history. This should dispose the forward entry in the top window,
   // but should not interfere with the currentEntry in the iframe.
-  let dispose_promise = new Promise(r => navigation.entries()[1].ondispose = r);
+  let dispose_promise = new Promise(r => navigation.entries()[start_index + 1].ondispose = r);
   iframe.contentWindow.navigation.currentEntry.ondispose = t.unreached_func("iframe entry must not be disposed");
   await navigation.navigate("#b").finished;
 
   await dispose_promise;
-  assert_equals(navigation.entries().length, 2);
+  assert_equals(navigation.entries().length, start_length + 1);
   assert_equals(iframe.contentWindow.navigation.entries().length, 1);
-  assert_equals(navigation.currentEntry.index, 1);
+  assert_equals(navigation.currentEntry.index, start_index + 1);
   assert_equals(iframe.contentWindow.navigation.currentEntry.index, 0);
 }, "Removing a currentEntry from the joint session history shouldn't dispose it");
 </script>
diff --git a/tests/wpt/tests/navigation-api/state/same-document-away-and-back-location-api.html b/tests/wpt/tests/navigation-api/state/same-document-away-and-back-location-api.html
index d161df8b529..ddc90eef8c5 100644
--- a/tests/wpt/tests/navigation-api/state/same-document-away-and-back-location-api.html
+++ b/tests/wpt/tests/navigation-api/state/same-document-away-and-back-location-api.html
@@ -6,7 +6,9 @@ async_test(t => {
   // Wait for after the load event so that the navigation doesn't get converted
   // into a replace navigation.
   window.onload = () => t.step_timeout(async () => {
+    let start_length = navigation.entries().length;
     let entry0 = navigation.currentEntry;
+    let start_index = entry0.index;
 
     let navState = { statevar: "state" };
     await navigation.navigate("#1", { state: navState });
@@ -15,10 +17,10 @@ async_test(t => {
     location.href = "#2";
     let entry2 = navigation.currentEntry;
 
-    assert_equals(navigation.entries().length, 3);
-    assert_equals(entry0, navigation.entries()[0]);
-    assert_equals(entry1, navigation.entries()[1]);
-    assert_equals(entry2, navigation.entries()[2]);
+    assert_equals(navigation.entries().length, start_length + 2);
+    assert_equals(entry0, navigation.entries()[start_index]);
+    assert_equals(entry1, navigation.entries()[start_index + 1]);
+    assert_equals(entry2, navigation.entries()[start_index + 2]);
 
     assert_equals(entry0.getState(), undefined);
 
@@ -34,9 +36,9 @@ async_test(t => {
 
     history.back();
     window.onpopstate = t.step_func_done(() => {
-      assert_equals(navigation.entries().length, 3);
+      assert_equals(navigation.entries().length, start_length + 2);
       let back_entry = navigation.currentEntry;
-      assert_equals(back_entry, navigation.entries()[1]);
+      assert_equals(back_entry, navigation.entries()[start_index + 1]);
       let back_state = back_entry.getState();
       assert_not_equals(back_state, state1);
       assert_not_equals(back_state, state2);
diff --git a/tests/wpt/tests/navigation-api/state/same-document-away-and-back-navigation-api.html b/tests/wpt/tests/navigation-api/state/same-document-away-and-back-navigation-api.html
index 220908e4c46..cfb7765b0d5 100644
--- a/tests/wpt/tests/navigation-api/state/same-document-away-and-back-navigation-api.html
+++ b/tests/wpt/tests/navigation-api/state/same-document-away-and-back-navigation-api.html
@@ -6,7 +6,9 @@ async_test(t => {
   // Wait for after the load event so that the navigation doesn't get converted
   // into a replace navigation.
   window.onload = () => t.step_timeout(async () => {
+    let start_length = navigation.entries().length;
     let entry0 = navigation.currentEntry;
+    let start_index = entry0.index;
 
     let navState = { statevar: "state" };
     await navigation.navigate("#1", { state: navState }).committed;
@@ -17,10 +19,10 @@ async_test(t => {
     let entry2 = navigation.currentEntry;
 
     t.step_func(() => {
-      assert_equals(navigation.entries().length, 3);
-      assert_equals(entry0, navigation.entries()[0]);
-      assert_equals(entry1, navigation.entries()[1]);
-      assert_equals(entry2, navigation.entries()[2]);
+      assert_equals(navigation.entries().length, start_length + 2);
+      assert_equals(entry0, navigation.entries()[start_index]);
+      assert_equals(entry1, navigation.entries()[start_index + 1]);
+      assert_equals(entry2, navigation.entries()[start_index + 2]);
 
       assert_equals(entry0.getState(), undefined);
 
@@ -38,9 +40,9 @@ async_test(t => {
 
       navigation.back();
       window.onpopstate = t.step_func_done(() => {
-        assert_equals(navigation.entries().length, 3);
+        assert_equals(navigation.entries().length, start_length + 2);
         let back_entry = navigation.currentEntry;
-        assert_equals(back_entry, navigation.entries()[1]);
+        assert_equals(back_entry, navigation.entries()[start_index + 1]);
         let back_state = back_entry.getState();
         assert_not_equals(back_state, state1);
         assert_not_equals(back_state, state2);
diff --git a/tests/wpt/tests/navigation-api/updateCurrentEntry-method/same-document-away-and-back-location-api.html b/tests/wpt/tests/navigation-api/updateCurrentEntry-method/same-document-away-and-back-location-api.html
index 47b1904f4f4..04b615cf831 100644
--- a/tests/wpt/tests/navigation-api/updateCurrentEntry-method/same-document-away-and-back-location-api.html
+++ b/tests/wpt/tests/navigation-api/updateCurrentEntry-method/same-document-away-and-back-location-api.html
@@ -6,7 +6,9 @@ async_test(t => {
   // Wait for after the load event so that the navigation doesn't get converted
   // into a replace navigation.
   window.onload = () => t.step_timeout(async () => {
+    let start_length = navigation.entries().length;
     let entry0 = navigation.currentEntry;
+    let start_index = entry0.index;
 
     let navState = { statevar: "state" };
     navigation.updateCurrentEntry({ state: navState });
@@ -15,9 +17,9 @@ async_test(t => {
     location.href = "#2";
     let entry1 = navigation.currentEntry;
 
-    assert_equals(navigation.entries().length, 2);
-    assert_equals(entry0, navigation.entries()[0]);
-    assert_equals(entry1, navigation.entries()[1]);
+    assert_equals(navigation.entries().length, start_length + 1);
+    assert_equals(entry0, navigation.entries()[start_index]);
+    assert_equals(entry1, navigation.entries()[start_index + 1]);
 
     assert_equals(entry0.getState().statevar, "state");
     assert_not_equals(entry0.getState(), navState);
@@ -28,7 +30,7 @@ async_test(t => {
 
     history.back();
     window.onpopstate = t.step_func_done(() => {
-      assert_equals(navigation.entries().length, 2);
+      assert_equals(navigation.entries().length, start_length + 1);
       let back_entry = navigation.currentEntry;
       assert_equals(back_entry, entry0);
       let back_state = back_entry.getState();
diff --git a/tests/wpt/tests/permissions-policy/reporting/report-only-and-enforce.https.sub.html b/tests/wpt/tests/permissions-policy/reporting/report-only-and-enforce.https.sub.html
new file mode 100644
index 00000000000..6254b3247e2
--- /dev/null
+++ b/tests/wpt/tests/permissions-policy/reporting/report-only-and-enforce.https.sub.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <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 src='../../mediacapture-streams/permission-helper.js'></script>
+    <script src='/reporting/resources/report-helper.js'></script>
+  </head>
+  <body>
+    <script>
+  const base_url = `${location.protocol}//${location.host}`;
+  const endpoint = `${base_url}/reporting/resources/report.py`;
+  const enforcing_id = '69c90b97-8b7c-4439-b5d2-ff03f237b2b2';
+  const report_only_id = '9d095a14-6b1c-40e1-be19-55a1fec97d11';
+
+  promise_test(async t => {
+    await setMediaPermission("granted", ["camera","microphone"]);
+    await promise_rejects_dom(
+        t, "NotAllowedError", navigator.mediaDevices.getUserMedia({video: true}),
+        "UserMedia camera access should not be allowed in this document.");
+    while(true) {
+      await wait(100);
+      const reports = await pollReports(endpoint, enforcing_id);
+      if (reports.length) {
+        checkReportExists(reports, 'permissions-policy-violation', location.href);
+        break;
+      }
+    }
+    const report_only_reports = await pollReports(endpoint, report_only_id);
+    assert_equals(report_only_reports.length, 0, "Report-only endpoint should not receive report.");
+  }, "Enforcing policy receives reports when both enforcing and report-only policies are set.");
+    </script>
+  </body>
+</html>
diff --git a/tests/wpt/tests/permissions-policy/reporting/report-only-and-enforce.https.sub.html.sub.headers b/tests/wpt/tests/permissions-policy/reporting/report-only-and-enforce.https.sub.html.sub.headers
new file mode 100644
index 00000000000..48f483dd45e
--- /dev/null
+++ b/tests/wpt/tests/permissions-policy/reporting/report-only-and-enforce.https.sub.html.sub.headers
@@ -0,0 +1,3 @@
+Permissions-Policy: camera=();report-to=enforcing-endpoint
+Permissions-Policy-Report-Only: camera=();report-to=report-only-endpoint
+Reporting-Endpoints: enforcing-endpoint="https://{{host}}:{{ports[https][0]}}/reporting/resources/report.py?reportID=69c90b97-8b7c-4439-b5d2-ff03f237b2b2", report-only-endpoint="https://{{host}}:{{ports[https][0]}}/reporting/resources/report.py?reportID=9d095a14-6b1c-40e1-be19-55a1fec97d11"
diff --git a/tests/wpt/tests/permissions-policy/reporting/report-only-single-endpoint.https.sub.html b/tests/wpt/tests/permissions-policy/reporting/report-only-single-endpoint.https.sub.html
new file mode 100644
index 00000000000..7f9bad40cbb
--- /dev/null
+++ b/tests/wpt/tests/permissions-policy/reporting/report-only-single-endpoint.https.sub.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <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 src='../../mediacapture-streams/permission-helper.js'></script>
+    <script src='/reporting/resources/report-helper.js'></script>
+  </head>
+  <body>
+    <script>
+  const base_url = `${location.protocol}//${location.host}`;
+  const endpoint = `${base_url}/reporting/resources/report.py`;
+  const id = 'c3841a1a-e750-4801-a50b-c4222d386515';
+
+  promise_test(async t => {
+    await setMediaPermission("granted", ["camera","microphone"]);
+    // This should not throw, as the enforcing policy does not block it.
+    await navigator.mediaDevices.getUserMedia({video: true});
+    while(true) {
+      await wait(100);
+      const reports = await pollReports(endpoint, id);
+      if (reports.length) {
+        checkReportExists(reports, 'permissions-policy-violation', location.href);
+        break;
+      }
+    }
+  }, "Reporting-Endpoints defined endpoint received reports in report-only mode.");
+    </script>
+  </body>
+</html>
diff --git a/tests/wpt/tests/permissions-policy/reporting/report-only-single-endpoint.https.sub.html.sub.headers b/tests/wpt/tests/permissions-policy/reporting/report-only-single-endpoint.https.sub.html.sub.headers
new file mode 100644
index 00000000000..881eaba1493
--- /dev/null
+++ b/tests/wpt/tests/permissions-policy/reporting/report-only-single-endpoint.https.sub.html.sub.headers
@@ -0,0 +1,2 @@
+Permissions-Policy-Report-Only: camera=();report-to=camera-endpoint
+Reporting-Endpoints: camera-endpoint="https://{{host}}:{{ports[https][0]}}/reporting/resources/report.py?reportID=c3841a1a-e750-4801-a50b-c4222d386515"
diff --git a/tests/wpt/tests/resources/chromium/generic_sensor_mocks.js b/tests/wpt/tests/resources/chromium/generic_sensor_mocks.js
index 98a29c2104f..5ca8dc0173b 100644
--- a/tests/wpt/tests/resources/chromium/generic_sensor_mocks.js
+++ b/tests/wpt/tests/resources/chromium/generic_sensor_mocks.js
@@ -1,5 +1,6 @@
 import {ReportingMode, Sensor, SensorClientRemote, SensorReceiver, SensorRemote, SensorType} from '/gen/services/device/public/mojom/sensor.mojom.m.js';
-import {SensorCreationResult, SensorInitParams_READ_BUFFER_SIZE_FOR_TESTS, SensorProvider, SensorProviderReceiver} from '/gen/services/device/public/mojom/sensor_provider.mojom.m.js';
+import {SensorCreationResult, SensorInitParams_READ_BUFFER_SIZE_FOR_TESTS} from '/gen/services/device/public/mojom/sensor_provider.mojom.m.js';
+import {WebSensorProvider, WebSensorProviderReceiver} from '/gen/third_party/blink/public/mojom/sensor/web_sensor_provider.mojom.m.js';
 
 // A "sliding window" that iterates over |data| and returns one item at a
 // time, advancing and wrapping around as needed. |data| must be an array of
@@ -287,8 +288,8 @@ self.GenericSensorTest = (() => {
     }
   }
 
-  // Class that mocks SensorProvider interface defined in
-  // https://cs.chromium.org/chromium/src/services/device/public/mojom/sensor_provider.mojom
+  // Class that mocks the WebSensorProvider interface defined in
+  // https://cs.chromium.org/chromium/src/third_party/blink/public/mojom/sensor/web_sensor_provider.mojom
   class MockSensorProvider {
     constructor() {
       this.readingSizeInBytes_ =
@@ -334,10 +335,10 @@ self.GenericSensorTest = (() => {
             SensorType.RELATIVE_ORIENTATION_EULER_ANGLES],
         ['ProximitySensor', SensorType.PROXIMITY]
       ]);
-      this.receiver_ = new SensorProviderReceiver(this);
+      this.receiver_ = new WebSensorProviderReceiver(this);
 
       this.interceptor_ =
-          new MojoInterfaceInterceptor(SensorProvider.$interfaceName);
+        new MojoInterfaceInterceptor(WebSensorProvider.$interfaceName);
       this.interceptor_.oninterfacerequest = e => {
         this.bindToPipe(e.handle);
       };
diff --git a/tests/wpt/tests/soft-navigation-heuristics/keydown.tentative.html b/tests/wpt/tests/soft-navigation-heuristics/keydown.tentative.html
index fac86d71d2c..19971e6d2da 100644
--- a/tests/wpt/tests/soft-navigation-heuristics/keydown.tentative.html
+++ b/tests/wpt/tests/soft-navigation-heuristics/keydown.tentative.html
@@ -2,7 +2,7 @@
 <html>
 <head>
 <meta charset="utf-8">
-<title>Detect hashchange event.</title>
+<title>Detect keyboard-event based soft navigations.</title>
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script src="/resources/testdriver.js"></script>
diff --git a/tests/wpt/tests/soft-navigation-heuristics/keypress.tentative.html b/tests/wpt/tests/soft-navigation-heuristics/keypress.tentative.html
new file mode 100644
index 00000000000..5bd512ec3e7
--- /dev/null
+++ b/tests/wpt/tests/soft-navigation-heuristics/keypress.tentative.html
@@ -0,0 +1,31 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<meta charset="utf-8">
+<title>Detect keyboard-event based soft navigations.</title>
+<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 src="resources/soft-navigation-helper.js"></script>
+</head>
+<!-- Not including a body element to ensure the keypress heuristic works on
+     malformed HTML -->
+  <main id=main>
+    <div>
+      First LCP!
+    </div>
+  </main>
+  <script>
+    testSoftNavigation({
+      addContent: () => {
+        addTextToDivOnMain();
+      },
+      link: document.body,
+      interactionType: "keypress",
+      eventType: "keypress",
+      test: "Keypress on body triggers SoftNavigationHeuristics"});
+  </script>
+</html>
+
+
diff --git a/tests/wpt/tests/soft-navigation-heuristics/keyup.tentative.html b/tests/wpt/tests/soft-navigation-heuristics/keyup.tentative.html
new file mode 100644
index 00000000000..8b5717d62e9
--- /dev/null
+++ b/tests/wpt/tests/soft-navigation-heuristics/keyup.tentative.html
@@ -0,0 +1,30 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<meta charset="utf-8">
+<title>Detect keyboard-event based soft navigations.</title>
+<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 src="resources/soft-navigation-helper.js"></script>
+</head>
+<!-- Not including a body element to ensure the keyup heuristic works on
+     malformed HTML -->
+  <main id=main>
+    <div>
+      First LCP!
+    </div>
+  </main>
+  <script>
+    testSoftNavigation({
+      addContent: () => {
+        addTextToDivOnMain();
+      },
+      link: document.body,
+      interactionType: "keyup",
+      eventType: "keyup",
+      test: "Keyup on body triggers SoftNavigationHeuristics"});
+  </script>
+</html>
+
diff --git a/tests/wpt/tests/soft-navigation-heuristics/resources/soft-navigation-helper.js b/tests/wpt/tests/soft-navigation-heuristics/resources/soft-navigation-helper.js
index 7f83df75f8f..1116ebccb35 100644
--- a/tests/wpt/tests/soft-navigation-heuristics/resources/soft-navigation-helper.js
+++ b/tests/wpt/tests/soft-navigation-heuristics/resources/soft-navigation-helper.js
@@ -149,7 +149,7 @@ const interact =
 
 const setEvent = (t, button, pushState, addContent, pushUrl, eventType, prepWork) => {
   const eventObject =
-      (eventType == 'click' || eventType == 'keydown') ? button : window;
+      (eventType == 'click' || eventType.startsWith("key")) ? button : window;
   eventObject.addEventListener(eventType, async e => {
     if (prepWork &&!prepWork(t)) {
       return;
@@ -194,7 +194,8 @@ const validateSoftNavigationEntry = async (clicks, extraValidations,
     assert_true(entry.name.includes(pushUrl ? URL : document.location.href),
                 "The soft navigation name is properly set");
     const entryTimestamp = entry.startTime;
-    assert_less_than_equal(timestamps[i]["syncPostInteraction"], entryTimestamp);
+    assert_less_than_equal(timestamps[i]["syncPostInteraction"], entryTimestamp,
+                "Entry timestamp is lower than the post interaction one");
     assert_greater_than_equal(
         timestamps[i]['eventStart'], entryTimestamp,
         'Event start timestamp matches');
diff --git a/tests/wpt/tests/svg/types/scripted/SVGLength-px-with-context.html b/tests/wpt/tests/svg/types/scripted/SVGLength-px-with-context.html
index b5c2149b692..7cbe27f83a3 100644
--- a/tests/wpt/tests/svg/types/scripted/SVGLength-px-with-context.html
+++ b/tests/wpt/tests/svg/types/scripted/SVGLength-px-with-context.html
@@ -26,11 +26,11 @@ setup(function() {
 
   function calculateXHeight() {
     // Crude hack to calculate the x-height
-    var divElement = document.createElement("div");
+    let divElement = document.createElement("div");
     divElement.setAttribute("style", "height: 1ex; font-size: 12px; font-family: Ahem;");
-    var pElement = document.querySelector("p");
+    let pElement = document.querySelector("p");
     pElement.appendChild(divElement);
-    var xHeight = divElement.offsetHeight;
+    let xHeight = divElement.offsetHeight;
     pElement.removeChild(divElement);
     return xHeight;
   }
@@ -48,17 +48,31 @@ test(function() {
 test(function() {
   length.valueAsString = "3px";
   length.convertToSpecifiedUnits(SVGLength.SVG_LENGTHTYPE_PERCENTAGE);
-  var referenceValue = 3 / svgWidth * 100;
+  let referenceValue = 3 / svgWidth * 100;
   assert_equals(length.valueAsString, referenceValue + "%");
   assert_equals(length.valueInSpecifiedUnits, referenceValue);
   assert_equals(length.value, 3);
   assert_equals(length.unitType, SVGLength.SVG_LENGTHTYPE_PERCENTAGE);
 }, document.title + ", percentage");
 
+test(function() {
+  let svgElement = document.getElementsByTagName("svg")[0];
+  let viewBox = svgElement.getAttribute("viewBox");
+  svgElement.removeAttribute("viewBox");
+  length.valueAsString = "50%";
+  let referenceValue = svgWidth / 2;
+  assert_equals(length.value, referenceValue);
+  svgElement.width.baseVal.value = 300;
+  referenceValue = svgElement.width.baseVal.value / 2;
+  assert_equals(length.value, referenceValue);
+  svgElement.width.baseVal.value = 150;
+  svgElement.setAttribute("viewBox", viewBox);
+}, document.title + ", changing percentage basis");
+
 test(function() {
   length.valueAsString = "6px";
   length.convertToSpecifiedUnits(SVGLength.SVG_LENGTHTYPE_EMS);
-  var referenceValue = 6 / fontSize;
+  let referenceValue = 6 / fontSize;
   assert_equals(length.valueAsString, referenceValue + "em");
   assert_equals(length.valueInSpecifiedUnits, referenceValue);
   assert_equals(length.value, 6);
@@ -68,7 +82,7 @@ test(function() {
 test(function() {
   length.valueAsString = "2px";
   length.convertToSpecifiedUnits(SVGLength.SVG_LENGTHTYPE_EXS);
-  var referenceValue = 2 / xHeight;
+  let referenceValue = 2 / xHeight;
   // Don't check valueAsString here, it's unreliable across browsers.
   assert_approx_equals(length.valueInSpecifiedUnits, referenceValue, 0.1);
   assert_approx_equals(length.value, 2.0, 0.1);
@@ -89,7 +103,7 @@ test(function() {
 test(function() {
   length.valueAsString = "48px";
   length.convertToSpecifiedUnits(SVGLength.SVG_LENGTHTYPE_CM);
-  var referenceValue = 48 * 2.54 / cssPixelsPerInch;
+  let referenceValue = 48 * 2.54 / cssPixelsPerInch;
   assert_equals(length.valueAsString, referenceValue.toFixed(2) + "cm");
   assert_approx_equals(length.valueInSpecifiedUnits, referenceValue, 0.001);
   assert_equals(length.value, 48);
@@ -99,7 +113,7 @@ test(function() {
 test(function() {
   length.valueAsString = "48px";
   length.convertToSpecifiedUnits(SVGLength.SVG_LENGTHTYPE_MM);
-  var referenceValue = 48 * 25.4 / cssPixelsPerInch;
+  let referenceValue = 48 * 25.4 / cssPixelsPerInch;
   assert_equals(length.valueAsString, referenceValue.toFixed(1) + "mm");
   assert_approx_equals(length.valueInSpecifiedUnits, referenceValue, 0.001);
   assert_equals(length.value, 48);
@@ -109,7 +123,7 @@ test(function() {
 test(function() {
   length.valueAsString = "48px";
   length.convertToSpecifiedUnits(SVGLength.SVG_LENGTHTYPE_IN);
-  var referenceValue = 48 / cssPixelsPerInch;
+  let referenceValue = 48 / cssPixelsPerInch;
   assert_equals(length.valueAsString, referenceValue + "in");
   assert_equals(length.valueInSpecifiedUnits, referenceValue);
   assert_equals(length.value, 48);
@@ -119,7 +133,7 @@ test(function() {
 test(function() {
   length.valueAsString = "4px";
   length.convertToSpecifiedUnits(SVGLength.SVG_LENGTHTYPE_PT);
-  var referenceValue = 4 / cssPixelsPerInch * 72;
+  let referenceValue = 4 / cssPixelsPerInch * 72;
   assert_equals(length.valueAsString, referenceValue + "pt");
   assert_equals(length.valueInSpecifiedUnits, referenceValue);
   assert_equals(length.value, 4);
@@ -129,7 +143,7 @@ test(function() {
 test(function() {
   length.valueAsString = "16px";
   length.convertToSpecifiedUnits(SVGLength.SVG_LENGTHTYPE_PC);
-  var referenceValue = 16 / cssPixelsPerInch * 6;
+  let referenceValue = 16 / cssPixelsPerInch * 6;
   // Don't check valueAsString here, it's unreliable across browsers.
   assert_equals(length.valueInSpecifiedUnits, referenceValue);
   assert_equals(length.value, 16);
diff --git a/tests/wpt/tests/tools/ci/run_tc.py b/tests/wpt/tests/tools/ci/run_tc.py
index a5a6256ad54..b91825497d4 100755
--- a/tests/wpt/tests/tools/ci/run_tc.py
+++ b/tests/wpt/tests/tools/ci/run_tc.py
@@ -140,6 +140,13 @@ def install_certificates():
     run(["sudo", "update-ca-certificates"])
 
 
+def start_dbus():
+    run(["sudo", "service", "dbus", "start"])
+    # Enable dbus autolaunch for Chrome
+    # https://source.chromium.org/chromium/chromium/src/+/main:content/app/content_main.cc;l=220;drc=0bcc023b8cdbc073aa5c48db373810db3f765c87.
+    os.environ["DBUS_SESSION_BUS_ADDRESS"] = "autolaunch:"
+
+
 def install_chrome(channel):
     if channel in ("experimental", "dev"):
         deb_archive = "google-chrome-unstable_current_amd64.deb"
@@ -257,6 +264,8 @@ def setup_environment(args):
     if "chrome" in args.browser:
         assert args.channel is not None
         install_chrome(args.channel)
+        # Chrome is using dbus for various features.
+        start_dbus()
 
     if args.xvfb:
         start_xvfb()
diff --git a/tests/wpt/tests/tools/webdriver/webdriver/bidi/modules/script.py b/tests/wpt/tests/tools/webdriver/webdriver/bidi/modules/script.py
index 99b26927403..f128b0d089c 100644
--- a/tests/wpt/tests/tools/webdriver/webdriver/bidi/modules/script.py
+++ b/tests/wpt/tests/tools/webdriver/webdriver/bidi/modules/script.py
@@ -124,7 +124,8 @@ class Script(BidiModule):
         arguments: Optional[List[Mapping[str, Any]]] = None,
         this: Optional[Mapping[str, Any]] = None,
         result_ownership: Optional[OwnershipModel] = None,
-        serialization_options: Optional[SerializationOptions] = None
+        serialization_options: Optional[SerializationOptions] = None,
+        user_activation: Optional[bool] = None
     ) -> Mapping[str, Any]:
         params: MutableMapping[str, Any] = {
             "functionDeclaration": function_declaration,
@@ -140,6 +141,8 @@ class Script(BidiModule):
             params["resultOwnership"] = result_ownership
         if serialization_options is not None:
             params["serializationOptions"] = serialization_options
+        if user_activation is not None:
+            params["userActivation"] = user_activation
         return params
 
     @call_function.result
@@ -165,7 +168,8 @@ class Script(BidiModule):
         target: Target,
         await_promise: bool,
         result_ownership: Optional[OwnershipModel] = None,
-        serialization_options: Optional[SerializationOptions] = None
+        serialization_options: Optional[SerializationOptions] = None,
+        user_activation: Optional[bool] = None
     ) -> Mapping[str, Any]:
         params: MutableMapping[str, Any] = {
             "expression": expression,
@@ -177,6 +181,8 @@ class Script(BidiModule):
             params["resultOwnership"] = result_ownership
         if serialization_options is not None:
             params["serializationOptions"] = serialization_options
+        if user_activation is not None:
+            params["userActivation"] = user_activation
         return params
 
     @evaluate.result
diff --git a/tests/wpt/tests/tools/wptrunner/wptrunner/browsers/firefox.py b/tests/wpt/tests/tools/wptrunner/wptrunner/browsers/firefox.py
index d91703f42dd..2ef3e18900f 100644
--- a/tests/wpt/tests/tools/wptrunner/wptrunner/browsers/firefox.py
+++ b/tests/wpt/tests/tools/wptrunner/wptrunner/browsers/firefox.py
@@ -117,7 +117,7 @@ def browser_kwargs(logger, test_type, run_info_data, config, subsuite, **kwargs)
                       "certutil_binary": kwargs["certutil_binary"],
                       "ca_certificate_path": config.ssl_config["ca_cert_path"],
                       "e10s": kwargs["gecko_e10s"],
-                      "enable_fission": run_info_data["fission"],
+                      "disable_fission": kwargs["disable_fission"],
                       "stackfix_dir": kwargs["stackfix_dir"],
                       "binary_args": kwargs["binary_args"].copy(),
                       "timeout_multiplier": get_timeout_multiplier(test_type,
@@ -174,6 +174,7 @@ def executor_kwargs(logger, test_type, test_environment, run_info_data,
     executor_kwargs["ccov"] = run_info_data.get("ccov", False)
     executor_kwargs["browser_version"] = run_info_data.get("browser_version")
     executor_kwargs["debug_test"] = kwargs["debug_test"]
+    executor_kwargs["disable_fission"] = kwargs["disable_fission"]
     return executor_kwargs
 
 
@@ -203,18 +204,13 @@ def run_info_extras(**kwargs):
         pref_value = get_bool_pref_if_exists(pref)
         return pref_value if pref_value is not None else False
 
-    # Default fission to on, unless we get --[no-]enable-fission or
-    # --set-pref fission.autostart=[true|false]
-    enable_fission = [item for item in [kwargs.get("enable_fission"),
-                                        get_bool_pref_if_exists("fission.autostart"),
-                                        True] if item is not None][0]
-
+    # Default fission to on, unless we get --disable-fission
     rv = {"e10s": kwargs["gecko_e10s"],
           "wasm": kwargs.get("wasm", True),
           "verify": kwargs["verify"],
           "headless": kwargs.get("headless", False) or "MOZ_HEADLESS" in os.environ,
-          "fission": enable_fission,
-          "sessionHistoryInParent": (enable_fission or
+          "fission": not kwargs.get("disable_fission"),
+          "sessionHistoryInParent": (not kwargs.get("disable_fission") or
                                      not get_bool_pref("fission.disableSessionHistoryInParent")),
           "swgl": get_bool_pref("gfx.webrender.software")}
 
@@ -610,7 +606,7 @@ class FirefoxOutputHandler(OutputHandler):
 
 class ProfileCreator:
     def __init__(self, logger, prefs_root, config, test_type, extra_prefs, e10s,
-                 enable_fission, debug_test, browser_channel, binary, certutil_binary,
+                 disable_fission, debug_test, browser_channel, binary, certutil_binary,
                  ca_certificate_path):
         self.logger = logger
         self.prefs_root = prefs_root
@@ -618,7 +614,7 @@ class ProfileCreator:
         self.test_type = test_type
         self.extra_prefs = extra_prefs
         self.e10s = e10s
-        self.enable_fission = enable_fission
+        self.disable_fission = disable_fission
         self.debug_test = debug_test
         self.browser_channel = browser_channel
         self.ca_certificate_path = ca_certificate_path
@@ -693,9 +689,8 @@ class ProfileCreator:
         if self.e10s:
             profile.set_preferences({"browser.tabs.remote.autostart": True})
 
-        if self.enable_fission:
-            profile.set_preferences({"fission.autostart": True})
-        else:
+        profile.set_preferences({"fission.autostart": True})
+        if self.disable_fission:
             profile.set_preferences({"fission.autostart": False})
 
         if self.test_type in ("reftest", "print-reftest"):
@@ -707,7 +702,7 @@ class ProfileCreator:
         # Bug 1262954: winxp + e10s, disable hwaccel
         if (self.e10s and platform.system() in ("Windows", "Microsoft") and
             "5.1" in platform.version()):
-            self.profile.set_preferences({"layers.acceleration.disabled": True})
+            profile.set_preferences({"layers.acceleration.disabled": True})
 
         if self.debug_test:
             profile.set_preferences({"devtools.console.stdout.content": True})
@@ -769,7 +764,7 @@ class FirefoxBrowser(Browser):
 
     def __init__(self, logger, binary, prefs_root, test_type, extra_prefs=None, debug_info=None,
                  symbols_path=None, stackwalk_binary=None, certutil_binary=None,
-                 ca_certificate_path=None, e10s=False, enable_fission=True,
+                 ca_certificate_path=None, e10s=False, disable_fission=False,
                  stackfix_dir=None, binary_args=None, timeout_multiplier=None, leak_check=False,
                  asan=False, chaos_mode_flags=None, config=None,
                  browser_channel="nightly", headless=None, preload_browser=False,
@@ -799,7 +794,7 @@ class FirefoxBrowser(Browser):
                                          test_type,
                                          extra_prefs,
                                          e10s,
-                                         enable_fission,
+                                         disable_fission,
                                          debug_test,
                                          browser_channel,
                                          binary,
@@ -872,7 +867,7 @@ class FirefoxWdSpecBrowser(WebDriverBrowser):
     def __init__(self, logger, binary, prefs_root, webdriver_binary, webdriver_args,
                  extra_prefs=None, debug_info=None, symbols_path=None, stackwalk_binary=None,
                  certutil_binary=None, ca_certificate_path=None, e10s=False,
-                 enable_fission=False, stackfix_dir=None, leak_check=False,
+                 disable_fission=False, stackfix_dir=None, leak_check=False,
                  asan=False, chaos_mode_flags=None, config=None,
                  browser_channel="nightly", headless=None, debug_test=False, **kwargs):
 
@@ -896,7 +891,7 @@ class FirefoxWdSpecBrowser(WebDriverBrowser):
                                          "wdspec",
                                          extra_prefs,
                                          e10s,
-                                         enable_fission,
+                                         disable_fission,
                                          debug_test,
                                          browser_channel,
                                          binary,
diff --git a/tests/wpt/tests/tools/wptrunner/wptrunner/browsers/firefox_android.py b/tests/wpt/tests/tools/wptrunner/wptrunner/browsers/firefox_android.py
index 8437dd20059..1937d97c401 100644
--- a/tests/wpt/tests/tools/wptrunner/wptrunner/browsers/firefox_android.py
+++ b/tests/wpt/tests/tools/wptrunner/wptrunner/browsers/firefox_android.py
@@ -62,6 +62,7 @@ def browser_kwargs(logger, test_type, run_info_data, config, **kwargs):
                                                          run_info_data,
                                                          **kwargs),
             "e10s": run_info_data["e10s"],
+            "disable_fission": kwargs["disable_fission"],
             # desktop only
             "leak_check": False,
             "chaos_mode_flags": kwargs["chaos_mode_flags"],
@@ -113,9 +114,9 @@ def get_environ(chaos_mode_flags, env_extras=None):
 
 class ProfileCreator(FirefoxProfileCreator):
     def __init__(self, logger, prefs_root, config, test_type, extra_prefs,
-                 enable_fission, debug_test, browser_channel, certutil_binary, ca_certificate_path):
+                 disable_fission, debug_test, browser_channel, certutil_binary, ca_certificate_path):
         super().__init__(logger, prefs_root, config, test_type, extra_prefs,
-                         True, enable_fission, debug_test, browser_channel, None,
+                         True, disable_fission, debug_test, browser_channel, None,
                          certutil_binary, ca_certificate_path)
 
     def _set_required_prefs(self, profile):
@@ -141,6 +142,10 @@ class ProfileCreator(FirefoxProfileCreator):
                 "layout.testing.overlay-scrollbars.always-visible": True,
             })
 
+        profile.set_preferences({"fission.autostart": True})
+        if self.disable_fission:
+            profile.set_preferences({"fission.autostart": False})
+
 
 class FirefoxAndroidBrowser(Browser):
     init_timeout = 300
@@ -153,7 +158,7 @@ class FirefoxAndroidBrowser(Browser):
                  binary_args=None, timeout_multiplier=None, leak_check=False, asan=False,
                  chaos_mode_flags=None, config=None, browser_channel="nightly",
                  install_fonts=False, tests_root=None, specialpowers_path=None, adb_binary=None,
-                 debug_test=False, **kwargs):
+                 debug_test=False, disable_fission=False, **kwargs):
 
         super().__init__(logger)
         self.prefs_root = prefs_root
@@ -178,13 +183,14 @@ class FirefoxAndroidBrowser(Browser):
         self.tests_root = tests_root
         self.specialpowers_path = specialpowers_path
         self.adb_binary = adb_binary
+        self.disable_fission = disable_fission
 
         self.profile_creator = ProfileCreator(logger,
                                               prefs_root,
                                               config,
                                               test_type,
                                               extra_prefs,
-                                              False,
+                                              disable_fission,
                                               debug_test,
                                               browser_channel,
                                               certutil_binary,
@@ -309,7 +315,7 @@ class FirefoxAndroidWdSpecBrowser(FirefoxWdSpecBrowser):
     def __init__(self, logger, prefs_root, webdriver_binary, webdriver_args,
                  extra_prefs=None, debug_info=None, symbols_path=None, stackwalk_binary=None,
                  certutil_binary=None, ca_certificate_path=None, e10s=False,
-                 enable_fission=False, stackfix_dir=None, leak_check=False,
+                 disable_fission=False, stackfix_dir=None, leak_check=False,
                  asan=False, chaos_mode_flags=None, config=None,
                  browser_channel="nightly", headless=None,
                  package_name="org.mozilla.geckoview.test_runner", device_serial=None,
@@ -319,7 +325,7 @@ class FirefoxAndroidWdSpecBrowser(FirefoxWdSpecBrowser):
                          extra_prefs=extra_prefs, debug_info=debug_info, symbols_path=symbols_path,
                          stackwalk_binary=stackwalk_binary, certutil_binary=certutil_binary,
                          ca_certificate_path=ca_certificate_path, e10s=e10s,
-                         enable_fission=enable_fission, stackfix_dir=stackfix_dir,
+                         disable_fission=disable_fission, stackfix_dir=stackfix_dir,
                          leak_check=leak_check, asan=asan,
                          chaos_mode_flags=chaos_mode_flags, config=config,
                          browser_channel=browser_channel, headless=headless, **kwargs)
diff --git a/tests/wpt/tests/tools/wptrunner/wptrunner/wptcommandline.py b/tests/wpt/tests/tools/wptrunner/wptrunner/wptcommandline.py
index 58c726fe379..d90f028ceb6 100644
--- a/tests/wpt/tests/tools/wptrunner/wptrunner/wptcommandline.py
+++ b/tests/wpt/tests/tools/wptrunner/wptrunner/wptcommandline.py
@@ -323,10 +323,7 @@ scheme host and port.""")
                              default=None, help="Don't preload a gecko instance for faster restarts")
     gecko_group.add_argument("--disable-e10s", dest="gecko_e10s", action="store_false", default=True,
                              help="Run tests without electrolysis preferences")
-    gecko_group.add_argument("--enable-fission", dest="enable_fission", action="store_true", default=None,
-                             help="Enable fission in Gecko (defaults to enabled; "
-                             "this option only exists for backward compatibility).")
-    gecko_group.add_argument("--no-enable-fission", dest="enable_fission", action="store_false",
+    gecko_group.add_argument("--disable-fission", dest="disable_fission", action="store_true", default=False,
                              help="Disable fission in Gecko.")
     gecko_group.add_argument("--stackfix-dir", dest="stackfix_dir", action="store",
                              help="Path to directory containing assertion stack fixing scripts")
diff --git a/tests/wpt/tests/webaudio/the-audio-api/the-audioparam-interface/moderate-exponentialRamp.html b/tests/wpt/tests/webaudio/the-audio-api/the-audioparam-interface/moderate-exponentialRamp.html
new file mode 100644
index 00000000000..cf32d253ae6
--- /dev/null
+++ b/tests/wpt/tests/webaudio/the-audio-api/the-audioparam-interface/moderate-exponentialRamp.html
@@ -0,0 +1,50 @@
+<!DOCTYPE html>
+<title>Test exponentialRampToValueAtTime() with a moderate ratio of change</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+'use strict';
+
+promise_test(async function() {
+  const bufferSize = 128;
+  const sampleRate = 16384;
+  // 3 * 2^6, not a power of two, so that there is some rounding error in the
+  // exponent
+  const rampEndSample = 192;
+  // These values are chosen so that there is rounding error in
+  // (offset1/offset0)^(1/rampEndSample).
+  const offset0 = 4.;
+  const offset1 = 7.;
+  // 8 units in the last place (ulp) is a generous tolerance if single
+  // precision powf() is used.  Math.pow(2, -23) ~ 1 ulp.
+  // A simple recurrence relation formulation with only single precision
+  // arithmetic applied across the whole rendering quantum would accumulate
+  // error up to 50 ulp, losing 5.6 of the 24 bits of precision.
+  const relativeTolerance = 8 * Math.pow(2, -23);
+
+  const context = new OfflineAudioContext(1, bufferSize, sampleRate);
+
+  const source = new ConstantSourceNode(context);
+  source.start();
+  // Explicit event to work around
+  // https://bugzilla.mozilla.org/show_bug.cgi?id=1265393
+  source.offset.setValueAtTime(offset0, 0.);
+  source.offset.exponentialRampToValueAtTime(offset1, rampEndSample/sampleRate);
+  source.connect(context.destination);
+
+  const buffer = await context.startRendering();
+  assert_equals(buffer.length, bufferSize, "output buffer length");
+  const output = buffer.getChannelData(0);
+  const ratio = offset1 / offset0;
+  for (let i = 0; i < bufferSize; ++i) {
+    // Math.pow() uses double precision, while `output` has single precision,
+    // but `tolerance` is more than enough to accommodate differences.
+    const expected = offset0 * Math.pow(offset1/offset0, i/rampEndSample);
+    assert_approx_equals(
+      output[i],
+      expected,
+      relativeTolerance * expected,
+      "scheduled value at " + i);
+  }
+});
+</script>
diff --git a/tests/wpt/tests/webcodecs/audio-encoder.https.any.js b/tests/wpt/tests/webcodecs/audio-encoder.https.any.js
index cd7739bcd26..51496551cf5 100644
--- a/tests/wpt/tests/webcodecs/audio-encoder.https.any.js
+++ b/tests/wpt/tests/webcodecs/audio-encoder.https.any.js
@@ -241,7 +241,7 @@ async function checkEncodingError(t, config, good_data, bad_data) {
 
   encoder.encode(bad_data);
   await promise_rejects_dom(t, 'EncodingError', encoder.flush().catch((e) => {
-    assert_equals(errors, 0);
+    assert_equals(errors, 1);
     throw e;
   }));
 
diff --git a/tests/wpt/tests/webcodecs/transfering.https.any.js b/tests/wpt/tests/webcodecs/transfering.https.any.js
index b9487e589d8..b127670d7b4 100644
--- a/tests/wpt/tests/webcodecs/transfering.https.any.js
+++ b/tests/wpt/tests/webcodecs/transfering.https.any.js
@@ -131,3 +131,57 @@ promise_test(async t => {
   // `data.buffer` didn't get detached
   assert_equals(data.length, 16, 'data.length');
 }, 'Test transfering same array buffer twice');
+
+promise_test(async t => {
+  const bytes = [ 0xBA, 0xDF, 0x00, 0xD0, 0xBA, 0xDF, 0x01, 0xD0, 0xBA, 0xDF ];
+  let data = new Uint8Array(bytes);
+  let unused_buffer = new ArrayBuffer(123);
+  let init = {
+    type: 'key',
+    timestamp: 0,
+    data: data,
+    transfer: [data.buffer, unused_buffer]
+  };
+
+  assert_equals(data.length, 10, 'data.length');
+  assert_equals(unused_buffer.byteLength, 123, 'unused_buffer.byteLength');
+
+  let chunk = new EncodedAudioChunk(init);
+  assert_equals(data.length, 0, 'data.length after detach');
+  assert_equals(unused_buffer.byteLength, 0, 'unused_buffer after detach');
+
+  let output_data = new Uint8Array(chunk.byteLength);
+  chunk.copyTo(output_data);
+  let expected_data = new Uint8Array(bytes);
+  assert_equals(expected_data.length, chunk.byteLength, 'expected_data size');
+  for (let i = 0; i < chunk.byteLength; i++) {
+    assert_equals(expected_data[i], output_data[i], `expected_data[${i}]`);
+  }
+}, 'Test transfering ArrayBuffer to EncodedAudioChunk');
+
+promise_test(async t => {
+  const bytes = [ 0xBA, 0xDF, 0x00, 0xD0, 0xBA, 0xDF, 0x01, 0xD0, 0xBA, 0xDF ];
+  let data = new Uint8Array(bytes);
+  let unused_buffer = new ArrayBuffer(123);
+  let init = {
+    type: 'key',
+    timestamp: 0,
+    data: data,
+    transfer: [data.buffer, unused_buffer]
+  };
+
+  assert_equals(data.length, 10, 'data.length');
+  assert_equals(unused_buffer.byteLength, 123, 'unused_buffer.byteLength');
+
+  let chunk = new EncodedVideoChunk(init);
+  assert_equals(data.length, 0, 'data.length after detach');
+  assert_equals(unused_buffer.byteLength, 0, 'unused_buffer after detach');
+
+  let output_data = new Uint8Array(chunk.byteLength);
+  chunk.copyTo(output_data);
+  let expected_data = new Uint8Array(bytes);
+  assert_equals(expected_data.length, chunk.byteLength, 'expected_data size');
+  for (let i = 0; i < chunk.byteLength; i++) {
+    assert_equals(expected_data[i], output_data[i], `expected_data[${i}]`);
+  }
+}, 'Test transfering ArrayBuffer to EncodedVideoChunk');
\ No newline at end of file
diff --git a/tests/wpt/tests/webdriver/tests/bidi/script/call_function/invalid.py b/tests/wpt/tests/webdriver/tests/bidi/script/call_function/invalid.py
index cfe5711e63b..9de343955c8 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/script/call_function/invalid.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/script/call_function/invalid.py
@@ -1,3 +1,5 @@
+# META: timeout=long
+
 import pytest
 import webdriver.bidi.error as error
 
@@ -421,3 +423,13 @@ async def test_params_include_shadow_tree_invalid_value(bidi_session, top_contex
             serialization_options=SerializationOptions(include_shadow_tree="foo"),
             target=ContextTarget(top_context["context"]),
             await_promise=True)
+
+
+@pytest.mark.parametrize("user_activation", ["foo", 42, {}, []])
+async def test_params_user_activation_invalid_type(bidi_session, top_context, user_activation):
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.script.call_function(
+            function_declaration="(arg) => arg",
+            target=ContextTarget(top_context["context"]),
+            await_promise=False,
+            user_activation=user_activation)
diff --git a/tests/wpt/tests/webdriver/tests/bidi/script/call_function/user_activation.py b/tests/wpt/tests/webdriver/tests/bidi/script/call_function/user_activation.py
new file mode 100644
index 00000000000..786fb43954f
--- /dev/null
+++ b/tests/wpt/tests/webdriver/tests/bidi/script/call_function/user_activation.py
@@ -0,0 +1,43 @@
+import pytest
+
+from webdriver.bidi.modules.script import ContextTarget
+
+
+@pytest.mark.asyncio
+@pytest.mark.parametrize("user_activation", [True, False])
+async def test_userActivation(bidi_session, top_context, user_activation):
+    # Consume any previously set activation.
+    await bidi_session.script.evaluate(
+        expression="""window.open();""",
+        target=ContextTarget(top_context["context"]),
+        await_promise=False)
+
+    result = await bidi_session.script.call_function(
+        function_declaration="() => navigator.userActivation.isActive && navigator.userActivation.hasBeenActive",
+        target=ContextTarget(top_context["context"]),
+        await_promise=True,
+        user_activation=user_activation)
+
+    assert result == {
+        "type": "boolean",
+        "value": user_activation}
+
+
+@pytest.mark.asyncio
+@pytest.mark.parametrize("user_activation", [True, False])
+async def test_userActivation_copy(bidi_session, top_context, user_activation):
+    # Consume any previously set activation.
+    await bidi_session.script.evaluate(
+        expression="""window.open();""",
+        target=ContextTarget(top_context["context"]),
+        await_promise=False)
+
+    result = await bidi_session.script.call_function(
+        function_declaration="() => document.body.appendChild(document.createTextNode('test')) && document.execCommand('selectAll') && document.execCommand('copy')",
+        target=ContextTarget(top_context["context"]),
+        await_promise=True,
+        user_activation=user_activation)
+
+    assert result == {
+        "type": "boolean",
+        "value": user_activation}
diff --git a/tests/wpt/tests/webdriver/tests/bidi/script/evaluate/invalid.py b/tests/wpt/tests/webdriver/tests/bidi/script/evaluate/invalid.py
index 666bf4d06e0..f27720a204e 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/script/evaluate/invalid.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/script/evaluate/invalid.py
@@ -152,3 +152,13 @@ async def test_params_include_shadow_tree_invalid_value(
             serialization_options=SerializationOptions(include_shadow_tree="foo"),
             target=ContextTarget(top_context["context"]),
             await_promise=True)
+
+
+@pytest.mark.parametrize("user_activation", ["foo", 42, {}, []])
+async def test_params_user_activation_invalid_type(bidi_session, top_context, user_activation):
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.script.evaluate(
+            expression="1 + 2",
+            user_activation=user_activation,
+            target=ContextTarget(top_context["context"]),
+            await_promise=True)
diff --git a/tests/wpt/tests/webdriver/tests/bidi/script/evaluate/user_activation.py b/tests/wpt/tests/webdriver/tests/bidi/script/evaluate/user_activation.py
new file mode 100644
index 00000000000..4ca558435d7
--- /dev/null
+++ b/tests/wpt/tests/webdriver/tests/bidi/script/evaluate/user_activation.py
@@ -0,0 +1,43 @@
+import pytest
+
+from webdriver.bidi.modules.script import ContextTarget
+
+
+@pytest.mark.asyncio
+@pytest.mark.parametrize("user_activation", [True, False])
+async def test_userActivation(bidi_session, top_context, user_activation):
+    # Consume any previously set activation.
+    await bidi_session.script.evaluate(
+        expression="""window.open();""",
+        target=ContextTarget(top_context["context"]),
+        await_promise=False)
+
+    result = await bidi_session.script.evaluate(
+        expression="navigator.userActivation.isActive && navigator.userActivation.hasBeenActive",
+        target=ContextTarget(top_context["context"]),
+        await_promise=True,
+        user_activation=user_activation)
+
+    assert result == {
+        "type": "boolean",
+        "value": user_activation}
+
+
+@pytest.mark.asyncio
+@pytest.mark.parametrize("user_activation", [True, False])
+async def test_userActivation_copy(bidi_session, top_context, user_activation):
+    # Consume any previously set activation.
+    await bidi_session.script.evaluate(
+        expression="""window.open();""",
+        target=ContextTarget(top_context["context"]),
+        await_promise=False)
+
+    result = await bidi_session.script.evaluate(
+        expression="document.body.appendChild(document.createTextNode('test')) && document.execCommand('selectAll') && document.execCommand('copy')",
+        target=ContextTarget(top_context["context"]),
+        await_promise=True,
+        user_activation=user_activation)
+
+    assert result == {
+        "type": "boolean",
+        "value": user_activation}
diff --git a/tests/wpt/tests/websockets/interfaces/WebSocket/close/close-connecting-async.any.js b/tests/wpt/tests/websockets/interfaces/WebSocket/close/close-connecting-async.any.js
new file mode 100644
index 00000000000..c7ace1fca27
--- /dev/null
+++ b/tests/wpt/tests/websockets/interfaces/WebSocket/close/close-connecting-async.any.js
@@ -0,0 +1,31 @@
+// META: script=../../../constants.sub.js
+// META: variant=
+// META: variant=?wpt_flags=h2
+// META: variant=?wss
+
+async_test(t => {
+  const ws = new WebSocket(SCHEME_DOMAIN_PORT + '/handshake_sleep_2');
+  let closeMethodReturned = false;
+  let errorEventSeen = false;
+  let closeEventSeen = false;
+  ws.onerror = t.step_func(() => {
+    assert_true(closeMethodReturned, 'ws.close() should have returned');
+    assert_false(errorEventSeen, 'error event should only fire once');
+    errorEventSeen = true;
+    assert_false(closeEventSeen, 'error event should come before close event');
+  });
+  ws.onclose = t.step_func_done(() => {
+    assert_true(closeMethodReturned, 'ws.close() should have returned');
+    assert_true(errorEventSeen, 'error event should have fired');
+    assert_false(closeEventSeen, 'close event should only fire once');
+    closeEventSeen = true;
+    assert_equals(ws.readyState, WebSocket.CLOSED,
+                  'readyState should be CLOSED');
+  });
+  assert_equals(ws.readyState, WebSocket.CONNECTING,
+                'readyState should be CONNECTING');
+  ws.close();
+  closeMethodReturned = true;
+  assert_equals(ws.readyState, WebSocket.CLOSING,
+                'readyState should be CLOSING');
+}, 'close event should be fired asynchronously when WebSocket is connecting');
diff --git a/tests/wpt/tests/workers/shared-worker-partitioned-cookies.tentative.https.html b/tests/wpt/tests/workers/shared-worker-partitioned-cookies.tentative.https.html
new file mode 100644
index 00000000000..e5f79cd8649
--- /dev/null
+++ b/tests/wpt/tests/workers/shared-worker-partitioned-cookies.tentative.https.html
@@ -0,0 +1,62 @@
+<!DOCTYPE html>
+<head>
+<meta charset="utf-8"/>
+<meta name="timeout" content="long">
+<title>SharedWorker: Partitioned Cookies</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/test-helpers.sub.js"></script>
+<script src="/common/get-host-info.sub.js"></script>
+<script src="support/shared-worker-partitioned-cookies-helper.js"></script>
+</head>
+
+<body>
+<script>
+
+promise_test(async () => {
+  // Set a Partitioned cookie.
+  document.cookie =
+      '__Host-partitioned=123; Secure; Path=/; SameSite=None; Partitioned;';
+  assert_true(document.cookie.includes('__Host-partitioned=123'));
+
+  // Set an unpartitioned cookie.
+  document.cookie = 'unpartitioned=456; Secure; Path=/; SameSite=None;';
+  assert_true(document.cookie.includes('unpartitioned=456'));
+
+  const worker = new SharedWorker('support/shared-worker-echo-cookies.js');
+  const nextMessage = workerMessageGenerator(worker);
+
+  worker.port.postMessage({type: 'test_message'});
+  const msg1 = await nextMessage();
+  assert_true(msg1.ok, 'Message passing');
+
+  worker.port.postMessage({type: 'echo_cookies_http'});
+  const msg2 = await nextMessage();
+  assert_true(msg2.ok, 'Get cookies');
+  assert_true(
+      msg2.cookies.includes('__Host-partitioned'),
+      'Can access partitioned cookie via HTTP');
+  assert_true(
+      msg2.cookies.includes('unpartitioned'),
+      'Can access unpartitioned cookie via HTTP');
+
+  worker.port.postMessage({type: 'echo_cookies_import'});
+  const msg3 = await nextMessage();
+  assert_true(msg3.ok, 'Get cookies');
+  assert_true(msg3.cookies.includes(
+      '__Host-partitioned'),
+      'Can access partitioned cookie via importScripts');
+  assert_true(
+      msg3.cookies.includes('unpartitioned'),
+      'Can access unpartitioned cookie via importScripts');
+
+  const popup = window.open(
+      new URL(
+          `./support/shared-worker-partitioned-cookies-3p-window.html?origin=${
+              encodeURIComponent(self.location.origin)}`,
+          get_host_info().HTTPS_NOTSAMESITE_ORIGIN + self.location.pathname));
+  await fetch_tests_from_window(popup);
+});
+
+</script>
+</body>
diff --git a/tests/wpt/tests/workers/support/shared-worker-echo-cookies.js b/tests/wpt/tests/workers/support/shared-worker-echo-cookies.js
new file mode 100644
index 00000000000..34dcbc9d260
--- /dev/null
+++ b/tests/wpt/tests/workers/support/shared-worker-echo-cookies.js
@@ -0,0 +1,40 @@
+let port;
+
+self.onconnect = e => {
+  port = e.ports[0];
+  port.addEventListener('message', onMessage);
+  port.start();
+};
+
+async function onMessage(e) {
+  switch (e.data.type) {
+    case 'test_message':
+      port.postMessage({ok: true});
+      return;
+    case 'echo_cookies_http':
+      return onEchoCookiesHttp(e);
+    case 'echo_cookies_import':
+      return onEchoCookiesImport();
+    default:
+      throw new Error('Unexpected message type ' + e.data.type);
+  }
+}
+
+async function onEchoCookiesHttp(e) {
+  try {
+    const resp = await fetch(
+        `${self.origin}/cookies/resources/list.py`, {credentials: 'include'});
+    const cookies = await resp.json();
+    port.postMessage({ok: true, cookies: Object.keys(cookies)});
+  } catch (err) {
+    port.postMessage({ok: false});
+  }
+}
+
+// Sets `self._cookies` variable, array of the names of cookies available to
+// the request.
+importScripts(`${self.origin}/cookies/resources/list-cookies-for-script.py`);
+
+function onEchoCookiesImport() {
+  port.postMessage({ok: true, cookies: self._cookies});
+}
diff --git a/tests/wpt/tests/workers/support/shared-worker-partitioned-cookies-3p-frame.html b/tests/wpt/tests/workers/support/shared-worker-partitioned-cookies-3p-frame.html
new file mode 100644
index 00000000000..dc700d31f97
--- /dev/null
+++ b/tests/wpt/tests/workers/support/shared-worker-partitioned-cookies-3p-frame.html
@@ -0,0 +1,50 @@
+<!DOCTYPE html>
+<head>
+<meta charset="utf-8"/>
+<meta name="timeout" content="long">
+<title>Service Worker: Partitioned Cookies 3P Iframe</title>
+<script src="/resources/testharness.js"></script>
+<script src="shared-worker-partitioned-cookies-helper.js"></script>
+</head>
+
+<body>
+<script>
+
+promise_test(async () => {
+  assert_false(
+      document.cookie.includes('__Host-partitioned=123'),
+      'DOM cannot access partitioned cookie');
+  assert_true(
+      document.cookie.includes('unpartitioned=456'),
+      'DOM can access unpartitioned cookie');
+
+  const worker = new SharedWorker('./shared-worker-echo-cookies.js');
+  const nextMessage = workerMessageGenerator(worker);
+
+  worker.port.postMessage({type: 'test_message'});
+  const msg1 = await nextMessage();
+  assert_true(msg1.ok, 'Message passing');
+
+  worker.port.postMessage({type: 'echo_cookies_http'});
+  const msg2 = await nextMessage();
+  assert_true(msg2.ok, 'Get cookies');
+  assert_false(
+      msg2.cookies.includes('__Host-partitioned'),
+      'Cannot access partitioned cookie via HTTP');
+  assert_true(
+      msg2.cookies.includes('unpartitioned'),
+      'Can access unpartitioned cookie via HTTP');
+
+  worker.port.postMessage({type: 'echo_cookies_import'});
+  const msg3 = await nextMessage();
+  assert_true(msg3.ok, 'Get cookies');
+  assert_false(
+      msg3.cookies.includes('__Host-partitioned'),
+      'Cannot access partitioned cookie via importScripts');
+  assert_true(
+      msg3.cookies.includes('unpartitioned'),
+      'Can access unpartitioned cookie via importScripts');
+});
+
+</script>
+</body>
diff --git a/tests/wpt/tests/workers/support/shared-worker-partitioned-cookies-3p-window.html b/tests/wpt/tests/workers/support/shared-worker-partitioned-cookies-3p-window.html
new file mode 100644
index 00000000000..e37e0a2cc6b
--- /dev/null
+++ b/tests/wpt/tests/workers/support/shared-worker-partitioned-cookies-3p-window.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<head>
+<meta charset="utf-8"/>
+<meta name="timeout" content="long">
+<title>SharedWorker: Partitioned Cookies 3P Window</title>
+<script src="/resources/testharness.js"></script>
+</head>
+
+<body>
+<script>
+
+promise_test(async t => {
+  assert_true(
+      location.search.includes('origin='), 'First party origin passed');
+  const first_party_origin =
+      new URLSearchParams(window.location.search).get('origin');
+  const iframe = document.createElement('iframe');
+  iframe.src = new URL(
+      './shared-worker-partitioned-cookies-3p-frame.html',
+      first_party_origin + location.pathname).href;
+  document.body.appendChild(iframe);
+  await fetch_tests_from_window(iframe.contentWindow);
+});
+
+</script>
+</body>
diff --git a/tests/wpt/tests/workers/support/shared-worker-partitioned-cookies-helper.js b/tests/wpt/tests/workers/support/shared-worker-partitioned-cookies-helper.js
new file mode 100644
index 00000000000..3bcdc879e8e
--- /dev/null
+++ b/tests/wpt/tests/workers/support/shared-worker-partitioned-cookies-helper.js
@@ -0,0 +1,28 @@
+// Return a generator containing the worker's message.
+//
+// Usage:
+//   const worker = new SharedWorker(...);
+//   const nextMessage = workerMessages(worker);
+//   const msg_1 = await nextMessage();
+//   const msg_2 = await nextMessage();
+//   const msg_3 = await nextMessage();
+function workerMessageGenerator(shared_worker) {
+  const buffer = [];
+  let resolve = null;
+
+  shared_worker.port.onmessage = message => {
+    buffer.push(message.data);
+    if (resolve) {
+      resolve();
+    }
+  }
+  shared_worker.port.start();
+
+  return async function() {
+    if (buffer.length != 0) {
+      return buffer.shift();
+    }
+    await new Promise(r => resolve = r);
+    return buffer.shift();
+  }
+}
diff --git a/tests/wpt/webgl/meta-legacy-layout/conformance2/state/gl-object-get-calls.html.ini b/tests/wpt/webgl/meta-legacy-layout/conformance2/state/gl-object-get-calls.html.ini
index 6e0dee35b92..97a24e350d4 100644
--- a/tests/wpt/webgl/meta-legacy-layout/conformance2/state/gl-object-get-calls.html.ini
+++ b/tests/wpt/webgl/meta-legacy-layout/conformance2/state/gl-object-get-calls.html.ini
@@ -2,7 +2,6 @@
   bug: https://github.com/servo/servo/issues/26128
   expected:
     if os == "mac": CRASH
-    TIMEOUT
   [WebGL test #201: gl.getTexParameter(gl.TEXTURE_2D, gl.TEXTURE_WRAP_R) should be 33071 (of type number). Was null (of type object).]
     expected: FAIL
 
@@ -119,6 +118,3 @@
 
   [WebGL test #202: gl.getTexParameter(gl.TEXTURE_2D, gl.TEXTURE_IMMUTABLE_FORMAT) should be false (of type boolean). Was 0 (of type number).]
     expected: FAIL
-
-  [Overall test]
-    expected: NOTRUN