diff --git a/tests/wpt/metadata/MANIFEST.json b/tests/wpt/metadata/MANIFEST.json
index 242904f4db2..d2a6ecbb8b1 100644
--- a/tests/wpt/metadata/MANIFEST.json
+++ b/tests/wpt/metadata/MANIFEST.json
@@ -13729,12 +13729,6 @@
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     [
      "/pointerevents/pointerevent_boundary_events_in_capturing-manual.html",
@@ -13777,18 +13771,6 @@
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      "/pointerevents/pointerevent_multiple_primary_pointers_boundary_events-manual.html",
@@ -13807,36 +13789,12 @@
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      "/pointerevents/pointerevent_pointerleave_pen-manual.html",
@@ -13849,36 +13807,18 @@
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    "pointerevents/pointerevent_releasepointercapture_events_to_original_target-manual.html": [
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      {}
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-   "pointerevents/pointerevent_releasepointercapture_onpointerup_mouse-manual.html": [
-    [
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-     {}
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    "pointerevents/pointerevent_releasepointercapture_release_right_after_capture-manual.html": [
     [
      "/pointerevents/pointerevent_releasepointercapture_release_right_after_capture-manual.html",
@@ -13897,48 +13837,18 @@
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-   "pointerevents/pointerevent_setpointercapture_disconnected-manual.html": [
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-     {}
-    ]
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-   "pointerevents/pointerevent_setpointercapture_invalid_pointerid-manual.html": [
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      "/pointerevents/pointerevent_setpointercapture_override_pending_capture_element-manual.html",
      {}
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-   "pointerevents/pointerevent_setpointercapture_relatedtarget-manual.html": [
-    [
-     "/pointerevents/pointerevent_setpointercapture_relatedtarget-manual.html",
-     {}
-    ]
-   ],
    "pointerevents/pointerevent_setpointercapture_to_same_element_twice-manual.html": [
     [
      "/pointerevents/pointerevent_setpointercapture_to_same_element_twice-manual.html",
      {}
     ]
    ],
-   "pointerevents/pointerevent_suppress_compat_events_on_click-manual.html": [
-    [
-     "/pointerevents/pointerevent_suppress_compat_events_on_click-manual.html",
-     {}
-    ]
-   ],
-   "pointerevents/pointerevent_suppress_compat_events_on_drag_mouse-manual.html": [
-    [
-     "/pointerevents/pointerevent_suppress_compat_events_on_drag_mouse-manual.html",
-     {}
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    "pointerevents/pointerevent_touch-action-auto-css_touch-manual.html": [
     [
      "/pointerevents/pointerevent_touch-action-auto-css_touch-manual.html",
@@ -17461,6 +17371,12 @@
      {}
     ]
    ],
+   "svg/interact/manual/event-attribute-001-manual.svg": [
+    [
+     "/svg/interact/manual/event-attribute-001-manual.svg",
+     {}
+    ]
+   ],
    "touch-events/multi-touch-interactions-manual.html": [
     [
      "/touch-events/multi-touch-interactions-manual.html",
@@ -68649,6 +68565,18 @@
      {}
     ]
    ],
+   "css/CSS2/normal-flow/intrinsic-size-with-negative-margins.html": [
+    [
+     "/css/CSS2/normal-flow/intrinsic-size-with-negative-margins.html",
+     [
+      [
+       "/css/reference/ref-filled-green-100px-square-only.html",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
    "css/CSS2/normal-flow/margin-collapse-through-zero-height-block.html": [
     [
      "/css/CSS2/normal-flow/margin-collapse-through-zero-height-block.html",
@@ -119757,6 +119685,18 @@
      {}
     ]
    ],
+   "css/css-fonts/font-display/font-display-feature-policy.tentative.html": [
+    [
+     "/css/css-fonts/font-display/font-display-feature-policy.tentative.html",
+     [
+      [
+       "/css/css-fonts/font-display/font-display-feature-policy.tentative-ref.html",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
    "css/css-fonts/font-display/font-display-preload.html": [
     [
      "/css/css-fonts/font-display/font-display-preload.html",
@@ -128001,6 +127941,18 @@
      {}
     ]
    ],
+   "css/css-multicol/float-with-line-after-spanner.html": [
+    [
+     "/css/css-multicol/float-with-line-after-spanner.html",
+     [
+      [
+       "/css/css-multicol/float-with-line-after-spanner-ref.html",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
    "css/css-multicol/inline-block-and-column-span-all.html": [
     [
      "/css/css-multicol/inline-block-and-column-span-all.html",
@@ -148113,6 +148065,18 @@
      {}
     ]
    ],
+   "css/css-transforms/preserve3d-nested-perspective.html": [
+    [
+     "/css/css-transforms/preserve3d-nested-perspective.html",
+     [
+      [
+       "/css/css-transforms/preserve3d-nested-perspective-ref.html",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
    "css/css-transforms/rotate/svg-rotate-3args-001.html": [
     [
      "/css/css-transforms/rotate/svg-rotate-3args-001.html",
@@ -256588,6 +256552,16 @@
      {}
     ]
    ],
+   "css/css-fonts/font-display/font-display-feature-policy.tentative-ref.html": [
+    [
+     {}
+    ]
+   ],
+   "css/css-fonts/font-display/font-display-feature-policy.tentative.html.headers": [
+    [
+     {}
+    ]
+   ],
    "css/css-fonts/font-display/font-display-preload-ref.html": [
     [
      {}
@@ -265108,6 +265082,16 @@
      {}
     ]
    ],
+   "css/css-grid/abspos/support/positioned-grid-descendants.css": [
+    [
+     {}
+    ]
+   ],
+   "css/css-grid/abspos/support/positioned-grid-descendants.js": [
+    [
+     {}
+    ]
+   ],
    "css/css-grid/alignment/grid-self-alignment-stretch-input-range-ref.html": [
     [
      {}
@@ -266233,6 +266217,11 @@
      {}
     ]
    ],
+   "css/css-multicol/float-with-line-after-spanner-ref.html": [
+    [
+     {}
+    ]
+   ],
    "css/css-multicol/multicol-block-no-clip-001-ref.xht": [
     [
      {}
@@ -272703,6 +272692,11 @@
      {}
     ]
    ],
+   "css/css-transforms/preserve3d-nested-perspective-ref.html": [
+    [
+     {}
+    ]
+   ],
    "css/css-transforms/reference/backface-visibility-hidden-ref.html": [
     [
      {}
@@ -287923,11 +287917,21 @@
      {}
     ]
    ],
+   "feature-policy/reporting/image.bmp": [
+    [
+     {}
+    ]
+   ],
    "feature-policy/reporting/image.jpg": [
     [
      {}
     ]
    ],
+   "feature-policy/reporting/legacy-image-formats-reporting.html.headers": [
+    [
+     {}
+    ]
+   ],
    "feature-policy/reporting/microphone-report-only.https.html.headers": [
     [
      {}
@@ -312328,7 +312332,7 @@
      {}
     ]
    ],
-   "signed-exchange/resources/sxg/sxg-head-request.sxg": [
+   "signed-exchange/resources/sxg/sxg-hsts.sxg": [
     [
      {}
     ]
@@ -343018,6 +343022,198 @@
      {}
     ]
    ],
+   "css/css-grid/abspos/orthogonal-positioned-grid-descendants-001.html": [
+    [
+     "/css/css-grid/abspos/orthogonal-positioned-grid-descendants-001.html",
+     {}
+    ]
+   ],
+   "css/css-grid/abspos/orthogonal-positioned-grid-descendants-002.html": [
+    [
+     "/css/css-grid/abspos/orthogonal-positioned-grid-descendants-002.html",
+     {}
+    ]
+   ],
+   "css/css-grid/abspos/orthogonal-positioned-grid-descendants-003.html": [
+    [
+     "/css/css-grid/abspos/orthogonal-positioned-grid-descendants-003.html",
+     {}
+    ]
+   ],
+   "css/css-grid/abspos/orthogonal-positioned-grid-descendants-004.html": [
+    [
+     "/css/css-grid/abspos/orthogonal-positioned-grid-descendants-004.html",
+     {}
+    ]
+   ],
+   "css/css-grid/abspos/orthogonal-positioned-grid-descendants-005.html": [
+    [
+     "/css/css-grid/abspos/orthogonal-positioned-grid-descendants-005.html",
+     {}
+    ]
+   ],
+   "css/css-grid/abspos/orthogonal-positioned-grid-descendants-006.html": [
+    [
+     "/css/css-grid/abspos/orthogonal-positioned-grid-descendants-006.html",
+     {}
+    ]
+   ],
+   "css/css-grid/abspos/orthogonal-positioned-grid-descendants-007.html": [
+    [
+     "/css/css-grid/abspos/orthogonal-positioned-grid-descendants-007.html",
+     {}
+    ]
+   ],
+   "css/css-grid/abspos/orthogonal-positioned-grid-descendants-008.html": [
+    [
+     "/css/css-grid/abspos/orthogonal-positioned-grid-descendants-008.html",
+     {}
+    ]
+   ],
+   "css/css-grid/abspos/orthogonal-positioned-grid-descendants-009.html": [
+    [
+     "/css/css-grid/abspos/orthogonal-positioned-grid-descendants-009.html",
+     {}
+    ]
+   ],
+   "css/css-grid/abspos/orthogonal-positioned-grid-descendants-010.html": [
+    [
+     "/css/css-grid/abspos/orthogonal-positioned-grid-descendants-010.html",
+     {}
+    ]
+   ],
+   "css/css-grid/abspos/orthogonal-positioned-grid-descendants-011.html": [
+    [
+     "/css/css-grid/abspos/orthogonal-positioned-grid-descendants-011.html",
+     {}
+    ]
+   ],
+   "css/css-grid/abspos/orthogonal-positioned-grid-descendants-012.html": [
+    [
+     "/css/css-grid/abspos/orthogonal-positioned-grid-descendants-012.html",
+     {}
+    ]
+   ],
+   "css/css-grid/abspos/orthogonal-positioned-grid-descendants-013.html": [
+    [
+     "/css/css-grid/abspos/orthogonal-positioned-grid-descendants-013.html",
+     {}
+    ]
+   ],
+   "css/css-grid/abspos/orthogonal-positioned-grid-descendants-014.html": [
+    [
+     "/css/css-grid/abspos/orthogonal-positioned-grid-descendants-014.html",
+     {}
+    ]
+   ],
+   "css/css-grid/abspos/orthogonal-positioned-grid-descendants-015.html": [
+    [
+     "/css/css-grid/abspos/orthogonal-positioned-grid-descendants-015.html",
+     {}
+    ]
+   ],
+   "css/css-grid/abspos/orthogonal-positioned-grid-descendants-016.html": [
+    [
+     "/css/css-grid/abspos/orthogonal-positioned-grid-descendants-016.html",
+     {}
+    ]
+   ],
+   "css/css-grid/abspos/positioned-grid-descendants-001.html": [
+    [
+     "/css/css-grid/abspos/positioned-grid-descendants-001.html",
+     {}
+    ]
+   ],
+   "css/css-grid/abspos/positioned-grid-descendants-002.html": [
+    [
+     "/css/css-grid/abspos/positioned-grid-descendants-002.html",
+     {}
+    ]
+   ],
+   "css/css-grid/abspos/positioned-grid-descendants-003.html": [
+    [
+     "/css/css-grid/abspos/positioned-grid-descendants-003.html",
+     {}
+    ]
+   ],
+   "css/css-grid/abspos/positioned-grid-descendants-004.html": [
+    [
+     "/css/css-grid/abspos/positioned-grid-descendants-004.html",
+     {}
+    ]
+   ],
+   "css/css-grid/abspos/positioned-grid-descendants-005.html": [
+    [
+     "/css/css-grid/abspos/positioned-grid-descendants-005.html",
+     {}
+    ]
+   ],
+   "css/css-grid/abspos/positioned-grid-descendants-006.html": [
+    [
+     "/css/css-grid/abspos/positioned-grid-descendants-006.html",
+     {}
+    ]
+   ],
+   "css/css-grid/abspos/positioned-grid-descendants-007.html": [
+    [
+     "/css/css-grid/abspos/positioned-grid-descendants-007.html",
+     {}
+    ]
+   ],
+   "css/css-grid/abspos/positioned-grid-descendants-008.html": [
+    [
+     "/css/css-grid/abspos/positioned-grid-descendants-008.html",
+     {}
+    ]
+   ],
+   "css/css-grid/abspos/positioned-grid-descendants-009.html": [
+    [
+     "/css/css-grid/abspos/positioned-grid-descendants-009.html",
+     {}
+    ]
+   ],
+   "css/css-grid/abspos/positioned-grid-descendants-010.html": [
+    [
+     "/css/css-grid/abspos/positioned-grid-descendants-010.html",
+     {}
+    ]
+   ],
+   "css/css-grid/abspos/positioned-grid-descendants-011.html": [
+    [
+     "/css/css-grid/abspos/positioned-grid-descendants-011.html",
+     {}
+    ]
+   ],
+   "css/css-grid/abspos/positioned-grid-descendants-012.html": [
+    [
+     "/css/css-grid/abspos/positioned-grid-descendants-012.html",
+     {}
+    ]
+   ],
+   "css/css-grid/abspos/positioned-grid-descendants-013.html": [
+    [
+     "/css/css-grid/abspos/positioned-grid-descendants-013.html",
+     {}
+    ]
+   ],
+   "css/css-grid/abspos/positioned-grid-descendants-014.html": [
+    [
+     "/css/css-grid/abspos/positioned-grid-descendants-014.html",
+     {}
+    ]
+   ],
+   "css/css-grid/abspos/positioned-grid-descendants-015.html": [
+    [
+     "/css/css-grid/abspos/positioned-grid-descendants-015.html",
+     {}
+    ]
+   ],
+   "css/css-grid/abspos/positioned-grid-descendants-016.html": [
+    [
+     "/css/css-grid/abspos/positioned-grid-descendants-016.html",
+     {}
+    ]
+   ],
    "css/css-grid/abspos/positioned-grid-items-should-not-create-implicit-tracks-001.html": [
     [
      "/css/css-grid/abspos/positioned-grid-items-should-not-create-implicit-tracks-001.html",
@@ -346978,6 +347174,12 @@
      {}
     ]
    ],
+   "css/css-sizing/aspect-ratio-affects-container-width-when-height-changes.html": [
+    [
+     "/css/css-sizing/aspect-ratio-affects-container-width-when-height-changes.html",
+     {}
+    ]
+   ],
    "css/css-sizing/percentage-height-replaced-content-in-auto-cb.html": [
     [
      "/css/css-sizing/percentage-height-replaced-content-in-auto-cb.html",
@@ -354162,6 +354364,30 @@
      {}
     ]
    ],
+   "css/selectors/invalidation/insert-sibling-001.html": [
+    [
+     "/css/selectors/invalidation/insert-sibling-001.html",
+     {}
+    ]
+   ],
+   "css/selectors/invalidation/insert-sibling-002.html": [
+    [
+     "/css/selectors/invalidation/insert-sibling-002.html",
+     {}
+    ]
+   ],
+   "css/selectors/invalidation/insert-sibling-003.html": [
+    [
+     "/css/selectors/invalidation/insert-sibling-003.html",
+     {}
+    ]
+   ],
+   "css/selectors/invalidation/insert-sibling-004.html": [
+    [
+     "/css/selectors/invalidation/insert-sibling-004.html",
+     {}
+    ]
+   ],
    "css/selectors/invalidation/is.html": [
     [
      "/css/selectors/invalidation/is.html",
@@ -354674,9 +354900,9 @@
      {}
     ]
    ],
-   "dom/collections/HTMLCollection-as-proto-length-get-throws.html": [
+   "dom/collections/HTMLCollection-as-prototype.html": [
     [
-     "/dom/collections/HTMLCollection-as-proto-length-get-throws.html",
+     "/dom/collections/HTMLCollection-as-prototype.html",
      {}
     ]
    ],
@@ -366710,6 +366936,12 @@
      {}
     ]
    ],
+   "feature-policy/reporting/legacy-image-formats-reporting.html": [
+    [
+     "/feature-policy/reporting/legacy-image-formats-reporting.html",
+     {}
+    ]
+   ],
    "feature-policy/reporting/microphone-report-only.https.html": [
     [
      "/feature-policy/reporting/microphone-report-only.https.html",
@@ -397740,6 +397972,14 @@
      {}
     ]
    ],
+   "pointerevents/pointerevent_boundary_events_at_implicit_release_hoverable_pointers.html": [
+    [
+     "/pointerevents/pointerevent_boundary_events_at_implicit_release_hoverable_pointers.html",
+     {
+      "testdriver": true
+     }
+    ]
+   ],
    "pointerevents/pointerevent_capture_mouse.html": [
     [
      "/pointerevents/pointerevent_capture_mouse.html",
@@ -397762,12 +398002,60 @@
      {}
     ]
    ],
+   "pointerevents/pointerevent_lostpointercapture_for_disconnected_node.html": [
+    [
+     "/pointerevents/pointerevent_lostpointercapture_for_disconnected_node.html",
+     {
+      "testdriver": true
+     }
+    ]
+   ],
+   "pointerevents/pointerevent_lostpointercapture_is_first.html": [
+    [
+     "/pointerevents/pointerevent_lostpointercapture_is_first.html",
+     {
+      "testdriver": true
+     }
+    ]
+   ],
    "pointerevents/pointerevent_on_event_handlers.html": [
     [
      "/pointerevents/pointerevent_on_event_handlers.html",
      {}
     ]
    ],
+   "pointerevents/pointerevent_pointerenter_does_not_bubble.html": [
+    [
+     "/pointerevents/pointerevent_pointerenter_does_not_bubble.html",
+     {
+      "testdriver": true
+     }
+    ]
+   ],
+   "pointerevents/pointerevent_pointerleave_descendant_over.html": [
+    [
+     "/pointerevents/pointerevent_pointerleave_descendant_over.html",
+     {
+      "testdriver": true
+     }
+    ]
+   ],
+   "pointerevents/pointerevent_pointerleave_descendants.html": [
+    [
+     "/pointerevents/pointerevent_pointerleave_descendants.html",
+     {
+      "testdriver": true
+     }
+    ]
+   ],
+   "pointerevents/pointerevent_pointerleave_does_not_bubble.html": [
+    [
+     "/pointerevents/pointerevent_pointerleave_does_not_bubble.html",
+     {
+      "testdriver": true
+     }
+    ]
+   ],
    "pointerevents/pointerevent_pointermove.html": [
     [
      "/pointerevents/pointerevent_pointermove.html",
@@ -397800,6 +398088,30 @@
      }
     ]
    ],
+   "pointerevents/pointerevent_pointerout_received_once.html": [
+    [
+     "/pointerevents/pointerevent_pointerout_received_once.html",
+     {
+      "testdriver": true
+     }
+    ]
+   ],
+   "pointerevents/pointerevent_releasepointercapture_invalid_pointerid.html": [
+    [
+     "/pointerevents/pointerevent_releasepointercapture_invalid_pointerid.html",
+     {
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   ],
   "pointerevents/pointerevent_pointerleave_after_pointercancel_touch-manual.html": [
    "56be26549f8fc9bed9836114569261f7252b3799",
    "manual"
   ],
-  "pointerevents/pointerevent_pointerleave_descendant_over-manual.html": [
-   "8f4f4bfc7a13116507b9241dcaab4519dab88ea6",
-   "manual"
+  "pointerevents/pointerevent_pointerleave_descendant_over.html": [
+   "ccc5f37477cc8eabc3effa75d45f2f45d7ea31f5",
+   "testharness"
   ],
-  "pointerevents/pointerevent_pointerleave_descendants-manual.html": [
-   "ac9edcff38a79814d9041b093205790e9beabd41",
-   "manual"
+  "pointerevents/pointerevent_pointerleave_descendants.html": [
+   "fe121a8409d802f26e97bd6c5f788397d7267aa2",
+   "testharness"
   ],
-  "pointerevents/pointerevent_pointerleave_does_not_bubble-manual.html": [
-   "c0e551cd658101035d3ac9f7b1511ebfdcc93b33",
-   "manual"
+  "pointerevents/pointerevent_pointerleave_does_not_bubble.html": [
+   "b19820ebd3df673846710887f5c13fdf01b60de7",
+   "testharness"
   ],
   "pointerevents/pointerevent_pointerleave_pen-manual.html": [
    "bb6dcc4236b0cc5183855275d85208db6460a5cb",
@@ -650921,25 +651491,25 @@
    "972f99d95080ab702da79f8125119a2b27778a84",
    "testharness"
   ],
-  "pointerevents/pointerevent_pointerout_received_once-manual.html": [
-   "4827ae91de1ba6307465ce3938ec95cead1c3c5c",
-   "manual"
+  "pointerevents/pointerevent_pointerout_received_once.html": [
+   "c76e1c57456111fb78cc230c27b34d2511fe3083",
+   "testharness"
   ],
   "pointerevents/pointerevent_releasepointercapture_events_to_original_target-manual.html": [
    "89f3d839f46d9982130d6aec3c9c0ed75862bfa4",
    "manual"
   ],
-  "pointerevents/pointerevent_releasepointercapture_invalid_pointerid-manual.html": [
-   "d0cf3671743a85e6b76015c1baab4864253148be",
-   "manual"
+  "pointerevents/pointerevent_releasepointercapture_invalid_pointerid.html": [
+   "75351dfb0689418537e6b20d92ac60feae0da2fb",
+   "testharness"
   ],
   "pointerevents/pointerevent_releasepointercapture_onpointercancel_touch-manual.html": [
    "497840041f6b6f67326bede1fbfef442f403f7b7",
    "manual"
   ],
-  "pointerevents/pointerevent_releasepointercapture_onpointerup_mouse-manual.html": [
-   "24fe40d5834b71247d19ce9aa0d35ceb74ca52fa",
-   "manual"
+  "pointerevents/pointerevent_releasepointercapture_onpointerup_mouse.html": [
+   "23c28b4bf755e493d747f7814a21aa598f4f0d8c",
+   "testharness"
   ],
   "pointerevents/pointerevent_releasepointercapture_release_right_after_capture-manual.html": [
    "8f64b9208732da5199dc934b3c16bee0c088146e",
@@ -650961,25 +651531,25 @@
    "982167dc5014d06c0babd3222696c8ba556d882e",
    "manual"
   ],
-  "pointerevents/pointerevent_setpointercapture_disconnected-manual.html": [
-   "9e9646525fad99c841fee7233fd1989682fd131d",
-   "manual"
+  "pointerevents/pointerevent_setpointercapture_disconnected.html": [
+   "a7cc3e00e23f1544cdb81762025929a194df0f75",
+   "testharness"
   ],
   "pointerevents/pointerevent_setpointercapture_inactive_button_mouse.html": [
    "7d0b00d47bc276dbba5ae3076bfbed0a912ea327",
    "testharness"
   ],
-  "pointerevents/pointerevent_setpointercapture_invalid_pointerid-manual.html": [
-   "e2b143fe4a57c1585d96ec4ee29aa82ed0ae4dba",
-   "manual"
+  "pointerevents/pointerevent_setpointercapture_invalid_pointerid.html": [
+   "3180ca53f5582b78514d94ccadfdbc1a7c6d84bc",
+   "testharness"
   ],
   "pointerevents/pointerevent_setpointercapture_override_pending_capture_element-manual.html": [
    "4e4818c21b706d9e169c7f82e8cd30cf82635dac",
    "manual"
   ],
-  "pointerevents/pointerevent_setpointercapture_relatedtarget-manual.html": [
-   "bc1bb93c7168764dd8d1ae7ea96fdc1cf3c0add7",
-   "manual"
+  "pointerevents/pointerevent_setpointercapture_relatedtarget.html": [
+   "79e55a1bd14a68cf53aa62305591fcd7ee6579f1",
+   "testharness"
   ],
   "pointerevents/pointerevent_setpointercapture_to_same_element_twice-manual.html": [
    "161c5c2fcb9bf00d77779b630fd193b0cfd9164e",
@@ -650993,13 +651563,13 @@
    "5c35e016a0ed51353868e0307af0896c62db64de",
    "support"
   ],
-  "pointerevents/pointerevent_suppress_compat_events_on_click-manual.html": [
-   "71b8a08289ada60d91884356919eb2e6ebab63b8",
-   "manual"
+  "pointerevents/pointerevent_suppress_compat_events_on_click.html": [
+   "77b5daaed41ad29d3dce34cfde57edb4667d5ea7",
+   "testharness"
   ],
-  "pointerevents/pointerevent_suppress_compat_events_on_drag_mouse-manual.html": [
-   "8afa04634bbddd9561172bcb6997b44c994014f3",
-   "manual"
+  "pointerevents/pointerevent_suppress_compat_events_on_drag_mouse.html": [
+   "5bab6e66121cebc47213914fb07f7995d8b0722d",
+   "testharness"
   ],
   "pointerevents/pointerevent_touch-action-auto-css_touch-manual.html": [
    "f5e9d12c353902852670524181df5bbdf48425df",
@@ -666902,7 +667472,7 @@
    "support"
   ],
   "signed-exchange/resources/generate-test-sxgs.sh": [
-   "c208e73a55836bdd0a02daf145127a220e4f6187",
+   "b351a4296de57ada97411808cdaa7b0e4d8463da",
    "support"
   ],
   "signed-exchange/resources/inner-url.html": [
@@ -666918,47 +667488,47 @@
    "support"
   ],
   "signed-exchange/resources/sxg/__dir__.headers": [
-   "ca41178420c5b2adf70c439435d40b6370535330",
+   "83a3c128cfe36a3c50eca2fae6ac866e1bd339c5",
    "support"
   ],
   "signed-exchange/resources/sxg/check-cert-request.sxg": [
-   "05f1646cfeb72d4c697ec73cee8855b787667568",
+   "d412f463822481c9ed5f6798fb3e45d4dd3fc969",
    "support"
   ],
   "signed-exchange/resources/sxg/fallback-to-another-sxg.sxg": [
-   "1af86c04134574c6a1ca4aa767ad716cab7de432",
+   "784b44abde996747a36e2177cf6f77325d7102df",
    "support"
   ],
   "signed-exchange/resources/sxg/nested-sxg.sxg": [
-   "2970e2df82c9ed697806d04004e676c2d168531c",
+   "c4eaf771c21ae7b54181a157ad602764cd51b4f9",
    "support"
   ],
-  "signed-exchange/resources/sxg/sxg-head-request.sxg": [
-   "9d09647481c18a0cf8c77af198b2eff15c950b96",
+  "signed-exchange/resources/sxg/sxg-hsts.sxg": [
+   "68650b8c3686a33c19234d18af78375b7a9cdb07",
    "support"
   ],
   "signed-exchange/resources/sxg/sxg-inner-url-bom.sxg": [
-   "ace5abdd0b0f95f31fca8477008c3fce0f333078",
+   "88e617d5fbb61a0e5a4abc6e881188c7eb23f60b",
    "support"
   ],
   "signed-exchange/resources/sxg/sxg-invalid-utf8-inner-url.sxg": [
-   "1f697b74b0d787d7cc30420c2cb68d0388d10b20",
+   "d045d5b88293c093e07b281a4e4aa9d8177d7a15",
    "support"
   ],
   "signed-exchange/resources/sxg/sxg-invalid-validity-url.sxg": [
-   "3266e7e7040e878b2371c412d12a84b232f58860",
+   "628f6ccf28371c8b09166a15201f6a86482c1e51",
    "support"
   ],
   "signed-exchange/resources/sxg/sxg-location.sxg": [
-   "a81854142a5cad67bbc1196d83a0e302b12f1869",
+   "3540bfea63c2735fc243b4ffe148980fe8a790db",
    "support"
   ],
   "signed-exchange/resources/sxg/sxg-noncacheable.sxg": [
-   "38be1eeb3aa041c267f7dc117314d5cb0a864cf2",
+   "38aa45980ca261ad33b3bc23354dd4ae7634a70f",
    "support"
   ],
   "signed-exchange/resources/sxg/sxg-utf8-inner-url.sxg": [
-   "c8f8a94ef90bed5383bbfc5742759893a1d21798",
+   "914a8458b0a7d71d1409a96a3c6d50f906504979",
    "support"
   ],
   "signed-exchange/sxg-double-prefetch.tentative.html": [
@@ -666969,8 +667539,8 @@
    "aae8fa8bd1954e790001e962094a810cff49444c",
    "testharness"
   ],
-  "signed-exchange/sxg-head-request.tentative.html": [
-   "ad65a5892d859b0ae90ccc5885ee07c0d96a04d5",
+  "signed-exchange/sxg-hsts.tentative.html": [
+   "6024e2879e7f0669ddd6e0ea40689ebd8cfbefaa",
    "testharness"
   ],
   "signed-exchange/sxg-inner-url-bom.tentative.html": [
@@ -669981,6 +670551,10 @@
    "e67f19ed43529af5e34683b6853ae870435be014",
    "testharness"
   ],
+  "svg/interact/manual/event-attribute-001-manual.svg": [
+   "af22470b9acbec92cae60bbb8178cc648e97e721",
+   "manual"
+  ],
   "svg/interact/parsing/pointer-events-invalid.svg": [
    "1c09010f694d89fc7128617de2e3b3ec385d2145",
    "testharness"
@@ -676430,7 +677004,7 @@
    "support"
   ],
   "tools/wptrunner/requirements_firefox.txt": [
-   "9e6f6b51ad7bf39181811789f0372a6b085d4c7f",
+   "7e85143249470c4ee8e13089b835a518e4e5667c",
    "support"
   ],
   "tools/wptrunner/requirements_ie.txt": [
@@ -680481,6 +681055,18 @@
    "1197ab9f237637f15aedd9152a615c1776c2f2c3",
    "support"
   ],
+  "web-share/canShare-files.https.html": [
+   "98863a4e2112e870d675a657811a3f464552e299",
+   "testharness"
+  ],
+  "web-share/canShare-insecure.http.html": [
+   "ce81c7c0c8a4e6d023257fce6cbd5ed802fabc2c",
+   "testharness"
+  ],
+  "web-share/canShare.https.html": [
+   "bb263e542559d8676c2dd94b7521ecf345dc712e",
+   "testharness"
+  ],
   "web-share/idlharness.https.window.js": [
    "cbaf9d72c5c11d9b75cd4a36aa0cf45bc0db35aa",
    "testharness"
@@ -683422,7 +684008,7 @@
    "testharness"
   ],
   "webrtc/RTCRtpReceiver-getContributingSources.https.html": [
-   "8ddff5be410d904fef572f84e98f760668078bb3",
+   "aa59f1b910aca14b2101b063654a17d1602ba26b",
    "testharness"
   ],
   "webrtc/RTCRtpReceiver-getParameters.html": [
diff --git a/tests/wpt/metadata/bluetooth/idl/idlharness.tentative.https.window.js.ini b/tests/wpt/metadata/bluetooth/idl/idlharness.tentative.https.window.js.ini
index fde38241560..1c51e32a2d5 100644
--- a/tests/wpt/metadata/bluetooth/idl/idlharness.tentative.https.window.js.ini
+++ b/tests/wpt/metadata/bluetooth/idl/idlharness.tentative.https.window.js.ini
@@ -5,18 +5,12 @@
   [Bluetooth interface: attribute onserviceadded]
     expected: FAIL
 
-  [BluetoothRemoteGATTService interface: existence and properties of interface object]
-    expected: FAIL
-
   [Bluetooth interface: navigator.bluetooth must inherit property "oncharacteristicvaluechanged" with the proper type]
     expected: FAIL
 
   [BluetoothServiceDataMap interface object length]
     expected: FAIL
 
-  [BluetoothDevice interface: existence and properties of interface prototype object]
-    expected: FAIL
-
   [BluetoothManufacturerDataMap interface: existence and properties of interface prototype object]
     expected: FAIL
 
@@ -26,9 +20,6 @@
   [BluetoothRemoteGATTDescriptor interface: operation readValue()]
     expected: FAIL
 
-  [BluetoothRemoteGATTCharacteristic interface: existence and properties of interface prototype object]
-    expected: FAIL
-
   [BluetoothAdvertisingEvent interface: event must inherit property "uuids" with the proper type]
     expected: FAIL
 
@@ -53,9 +44,6 @@
   [BluetoothRemoteGATTService interface: operation getCharacteristics(BluetoothCharacteristicUUID)]
     expected: FAIL
 
-  [BluetoothRemoteGATTService interface: existence and properties of interface prototype object]
-    expected: FAIL
-
   [BluetoothRemoteGATTCharacteristic interface: operation stopNotifications()]
     expected: FAIL
 
@@ -128,9 +116,6 @@
   [BluetoothRemoteGATTCharacteristic interface: operation writeValue(BufferSource)]
     expected: FAIL
 
-  [BluetoothRemoteGATTCharacteristic interface: existence and properties of interface object]
-    expected: FAIL
-
   [BluetoothRemoteGATTServer interface: operation getPrimaryService(BluetoothServiceUUID)]
     expected: FAIL
 
@@ -158,9 +143,6 @@
   [ValueEvent interface object length]
     expected: FAIL
 
-  [BluetoothDevice interface: existence and properties of interface object]
-    expected: FAIL
-
   [ValueEvent interface: existence and properties of interface prototype object's @@unscopables property]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/css/css-fonts/font-display/font-display-feature-policy.tentative.html.ini b/tests/wpt/metadata/css/css-fonts/font-display/font-display-feature-policy.tentative.html.ini
new file mode 100644
index 00000000000..5345ae812b9
--- /dev/null
+++ b/tests/wpt/metadata/css/css-fonts/font-display/font-display-feature-policy.tentative.html.ini
@@ -0,0 +1,2 @@
+[font-display-feature-policy.tentative.html]
+  expected: FAIL
diff --git a/tests/wpt/metadata/css/cssom-view/scroll-behavior-smooth.html.ini b/tests/wpt/metadata/css/cssom-view/scroll-behavior-smooth.html.ini
index bcd187f508c..8e2ceeddfbe 100644
--- a/tests/wpt/metadata/css/cssom-view/scroll-behavior-smooth.html.ini
+++ b/tests/wpt/metadata/css/cssom-view/scroll-behavior-smooth.html.ini
@@ -6,3 +6,6 @@
   [Instant scrolling while doing history navigation.]
     expected: FAIL
 
+  [Smooth scrolling while doing history navigation.]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/css/selectors/invalidation/insert-sibling-002.html.ini b/tests/wpt/metadata/css/selectors/invalidation/insert-sibling-002.html.ini
new file mode 100644
index 00000000000..78abde47cd0
--- /dev/null
+++ b/tests/wpt/metadata/css/selectors/invalidation/insert-sibling-002.html.ini
@@ -0,0 +1,4 @@
+[insert-sibling-002.html]
+  [Remove/Insert adjacent sibling of parent]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/css/selectors/invalidation/insert-sibling-003.html.ini b/tests/wpt/metadata/css/selectors/invalidation/insert-sibling-003.html.ini
new file mode 100644
index 00000000000..3e2d06a317f
--- /dev/null
+++ b/tests/wpt/metadata/css/selectors/invalidation/insert-sibling-003.html.ini
@@ -0,0 +1,4 @@
+[insert-sibling-003.html]
+  [Remove/Insert earlier sibling of ancestor]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/css/selectors/invalidation/insert-sibling-004.html.ini b/tests/wpt/metadata/css/selectors/invalidation/insert-sibling-004.html.ini
new file mode 100644
index 00000000000..09caf251718
--- /dev/null
+++ b/tests/wpt/metadata/css/selectors/invalidation/insert-sibling-004.html.ini
@@ -0,0 +1,4 @@
+[insert-sibling-004.html]
+  [Remove/Insert earlier sibling of parent]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/dom/collections/HTMLCollection-as-prototype.html.ini b/tests/wpt/metadata/dom/collections/HTMLCollection-as-prototype.html.ini
new file mode 100644
index 00000000000..dbbfafcbee5
--- /dev/null
+++ b/tests/wpt/metadata/dom/collections/HTMLCollection-as-prototype.html.ini
@@ -0,0 +1,4 @@
+[HTMLCollection-as-prototype.html]
+  [HTMLCollection as a prototype and setting own properties]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/encoding/single-byte-decoder.html.ini b/tests/wpt/metadata/encoding/single-byte-decoder.html.ini
index 21588fafb55..0db3e87a719 100644
--- a/tests/wpt/metadata/encoding/single-byte-decoder.html.ini
+++ b/tests/wpt/metadata/encoding/single-byte-decoder.html.ini
@@ -32,6 +32,7 @@
 
 
 [single-byte-decoder.html?XMLHttpRequest]
+  expected: CRASH
   [ISO-8859-2: iso_8859-2:1987 (XMLHttpRequest)]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/fetch/content-type/response.window.js.ini b/tests/wpt/metadata/fetch/content-type/response.window.js.ini
index 18f786d4963..02a6e56df1c 100644
--- a/tests/wpt/metadata/fetch/content-type/response.window.js.ini
+++ b/tests/wpt/metadata/fetch/content-type/response.window.js.ini
@@ -312,3 +312,6 @@
   [<iframe>: separate response Content-Type: text/plain */*;charset=gbk]
     expected: FAIL
 
+  [<iframe>: combined response Content-Type: text/html;" text/plain]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/fetch/nosniff/parsing-nosniff.window.js.ini b/tests/wpt/metadata/fetch/nosniff/parsing-nosniff.window.js.ini
index 87c807a49ff..d4ba399b762 100644
--- a/tests/wpt/metadata/fetch/nosniff/parsing-nosniff.window.js.ini
+++ b/tests/wpt/metadata/fetch/nosniff/parsing-nosniff.window.js.ini
@@ -11,3 +11,6 @@
   [X-Content-Type-Options%3A%20nosniff%0C]
     expected: FAIL
 
+  [X-Content-Type-Options%3A%20'NosniFF']
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini
new file mode 100644
index 00000000000..dc2e45516de
--- /dev/null
+++ b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini
@@ -0,0 +1,4 @@
+[traverse_the_history_5.html]
+  [Multiple history traversals, last would be aborted]
+    expected: FAIL
+
diff --git a/tests/wpt/mozilla/meta/css/transition_calc_implicit.html.ini b/tests/wpt/mozilla/meta/css/transition_calc_implicit.html.ini
new file mode 100644
index 00000000000..dbea4f293ad
--- /dev/null
+++ b/tests/wpt/mozilla/meta/css/transition_calc_implicit.html.ini
@@ -0,0 +1,2 @@
+[transition_calc_implicit.html]
+  expected: TIMEOUT
diff --git a/tests/wpt/mozilla/meta/mozilla/paint_timing.html.ini b/tests/wpt/mozilla/meta/mozilla/paint_timing.html.ini
deleted file mode 100644
index 14a9e778f39..00000000000
--- a/tests/wpt/mozilla/meta/mozilla/paint_timing.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[paint_timing.html]
-  [Performance entries observer]
-    expected: FAIL
-
diff --git a/tests/wpt/web-platform-tests/css/CSS2/normal-flow/intrinsic-size-with-negative-margins.html b/tests/wpt/web-platform-tests/css/CSS2/normal-flow/intrinsic-size-with-negative-margins.html
new file mode 100644
index 00000000000..93dfc3dfd77
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/CSS2/normal-flow/intrinsic-size-with-negative-margins.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<title>Intrinsic size of an atomic inline with negative margins.</title>
+<link rel="help" href="https://www.w3.org/TR/CSS22/visudet.html#propdef-width">
+<link rel="match" href="../../reference/ref-filled-green-100px-square-only.html">
+<p>Test passes if there is a filled green square.</p>
+<div style="display: inline-block; border: solid green 25px; line-height: 0;">
+  <div style="display: inline-block; width: 50px; height: 50px; margin-right: -100%; background: green;"></div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-fonts/font-display/font-display-feature-policy.tentative-ref.html b/tests/wpt/web-platform-tests/css/css-fonts/font-display/font-display-feature-policy.tentative-ref.html
new file mode 100644
index 00000000000..5b707e5b43a
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-fonts/font-display/font-display-feature-policy.tentative-ref.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<title>Test for font-display-late-swap feature policy</title>
+<style>
+.ahem {
+  font-family: 'Ahem';
+}
+.arial {
+  font-family: 'Arial';
+}
+</style>
+<p>Tests if font-display is set to optional for each option except for when it is set to fallback</p>
+<table id="container">
+ <tr>
+  <th>not-set</th>
+  <th>auto</th>
+  <th>block</th>
+  <th>swap</th>
+  <th>fallback</th>
+  <th>optional</th>
+ </tr>
+ <tr>
+  <td class="arial">a</td>
+  <td class="arial">a</td>
+  <td class="arial">a</td>
+  <td class="arial">a</td>
+  <td class="ahem">a</td>
+  <td class="arial">a</td>
+ </tr>
+</table>
diff --git a/tests/wpt/web-platform-tests/css/css-fonts/font-display/font-display-feature-policy.tentative.html b/tests/wpt/web-platform-tests/css/css-fonts/font-display/font-display-feature-policy.tentative.html
new file mode 100644
index 00000000000..558f5b8aa8a
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-fonts/font-display/font-display-feature-policy.tentative.html
@@ -0,0 +1,46 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+<title>Test for font-display-late-swap feature policy</title>
+<link rel="help" href="https://github.com/w3c/webappsec-feature-policy/blob/master/policies/font-display-late-swap.md">
+<link rel="match" href="font-display-feature-policy.tentative-ref.html">
+<style>
+</style>
+<p>Tests if font-display is set to optional for each option except for when it is set to fallback</p>
+<table id="container">
+ <tr>
+  <th>not-set</th>
+  <th>auto</th>
+  <th>block</th>
+  <th>swap</th>
+  <th>fallback</th>
+  <th>optional</th>
+ </tr>
+</table>
+<script>
+const fontDisplayValues = ['', 'auto', 'block', 'swap', 'fallback', 'optional'];
+const table = document.getElementById('container');
+
+function makeFontFaceDeclaration(family, display) {
+    url = '/fonts/Ahem.ttf?pipe=trickle(d1)'; // Before the swap period is over
+    return '@font-face { font-family: ' + family + '; src: url("' + url + '"); font-display: ' + display + '; }';
+}
+
+window.onload = () => {
+    let tr = document.createElement('tr');
+    for (let display of fontDisplayValues) {
+        const family = display + '-face';
+        const rule = makeFontFaceDeclaration(family, display);
+        document.styleSheets[0].insertRule(rule, 0);
+        let td = document.createElement('td');
+        td.textContent = 'a';
+        td.style.fontFamily = family + ', Arial';
+        tr.appendChild(td);
+    }
+    table.appendChild(tr);
+    const timeoutMilliSec = 1500; // After the font is loaded
+    setTimeout(() => {
+        document.documentElement.classList.remove("reftest-wait");
+    }, timeoutMilliSec);
+}
+</script>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-fonts/font-display/font-display-feature-policy.tentative.html.headers b/tests/wpt/web-platform-tests/css/css-fonts/font-display/font-display-feature-policy.tentative.html.headers
new file mode 100644
index 00000000000..0c3e29db99f
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-fonts/font-display/font-display-feature-policy.tentative.html.headers
@@ -0,0 +1 @@
+Feature-Policy: font-display-late-swap 'none';
\ No newline at end of file
diff --git a/tests/wpt/web-platform-tests/css/css-grid/abspos/orthogonal-positioned-grid-descendants-001.html b/tests/wpt/web-platform-tests/css/css-grid/abspos/orthogonal-positioned-grid-descendants-001.html
new file mode 100644
index 00000000000..856b8013af9
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/abspos/orthogonal-positioned-grid-descendants-001.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Positioned grid descendants</title>
+<link rel="author" title="Oriol Brufau" href="mailto:obrufau@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid/#abspos" title="9. Absolute Positioning">
+<meta name="assert" content="Checks that absolutely positioned orthogonal elements inside grid items are properly placed and sized when they have a static position (left/rigth and top/bottom are 'auto').">
+
+<link rel="stylesheet" href="support/positioned-grid-descendants.css" />
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+
+<body>
+<div id="log"></div>
+<script type="module">
+import {runTests} from "./support/positioned-grid-descendants.js";
+runTests({
+  left: "auto",
+  top: "auto",
+  right: "auto",
+  bottom: "auto",
+  orthogonal: true,
+});
+</script>
+</body>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/abspos/orthogonal-positioned-grid-descendants-002.html b/tests/wpt/web-platform-tests/css/css-grid/abspos/orthogonal-positioned-grid-descendants-002.html
new file mode 100644
index 00000000000..4a039c9e92b
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/abspos/orthogonal-positioned-grid-descendants-002.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Positioned grid descendants</title>
+<link rel="author" title="Oriol Brufau" href="mailto:obrufau@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid/#abspos" title="9. Absolute Positioning">
+<meta name="assert" content="Checks that absolutely positioned orthogonal elements inside grid items are properly placed and sized when they have a specific 'left' offset and a static block position (top/bottom are 'auto').">
+
+<link rel="stylesheet" href="support/positioned-grid-descendants.css" />
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+
+<body>
+<div id="log"></div>
+<script type="module">
+import {runTests} from "./support/positioned-grid-descendants.js";
+runTests({
+  left: 25,
+  top: "auto",
+  right: "auto",
+  bottom: "auto",
+  orthogonal: true,
+});
+</script>
+</body>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/abspos/orthogonal-positioned-grid-descendants-003.html b/tests/wpt/web-platform-tests/css/css-grid/abspos/orthogonal-positioned-grid-descendants-003.html
new file mode 100644
index 00000000000..6482248d664
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/abspos/orthogonal-positioned-grid-descendants-003.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Positioned grid descendants</title>
+<link rel="author" title="Oriol Brufau" href="mailto:obrufau@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid/#abspos" title="9. Absolute Positioning">
+<meta name="assert" content="Checks that absolutely positioned orthogonal elements inside grid items are properly placed and sized when they have a specific 'top' offset and a static inline position (left/right are 'auto').">
+
+<link rel="stylesheet" href="support/positioned-grid-descendants.css" />
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+
+<body>
+<div id="log"></div>
+<script type="module">
+import {runTests} from "./support/positioned-grid-descendants.js";
+runTests({
+  left: "auto",
+  top: 30,
+  right: "auto",
+  bottom: "auto",
+  orthogonal: true,
+});
+</script>
+</body>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/abspos/orthogonal-positioned-grid-descendants-004.html b/tests/wpt/web-platform-tests/css/css-grid/abspos/orthogonal-positioned-grid-descendants-004.html
new file mode 100644
index 00000000000..054892ba1e7
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/abspos/orthogonal-positioned-grid-descendants-004.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Positioned grid descendants</title>
+<link rel="author" title="Oriol Brufau" href="mailto:obrufau@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid/#abspos" title="9. Absolute Positioning">
+<meta name="assert" content="Checks that absolutely positioned orthogonal elements inside grid items are properly placed and sized when they have specific 'right' offset and a static block position (top/bottom are 'auto').">
+
+<link rel="stylesheet" href="support/positioned-grid-descendants.css" />
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+
+<body>
+<div id="log"></div>
+<script type="module">
+import {runTests} from "./support/positioned-grid-descendants.js";
+runTests({
+  left: "auto",
+  top: "auto",
+  right: 35,
+  bottom: "auto",
+  orthogonal: true,
+});
+</script>
+</body>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/abspos/orthogonal-positioned-grid-descendants-005.html b/tests/wpt/web-platform-tests/css/css-grid/abspos/orthogonal-positioned-grid-descendants-005.html
new file mode 100644
index 00000000000..41ff1947f07
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/abspos/orthogonal-positioned-grid-descendants-005.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Positioned grid descendants</title>
+<link rel="author" title="Oriol Brufau" href="mailto:obrufau@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid/#abspos" title="9. Absolute Positioning">
+<meta name="assert" content="Checks that absolutely positioned orthogonal elements inside grid items are properly placed and sized when they have specific 'bottom' offset and a static inline position (left/right are 'auto').">
+
+<link rel="stylesheet" href="support/positioned-grid-descendants.css" />
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+
+<body>
+<div id="log"></div>
+<script type="module">
+import {runTests} from "./support/positioned-grid-descendants.js";
+runTests({
+  left: "auto",
+  right: "auto",
+  top: "auto",
+  bottom: 40,
+  orthogonal: true,
+});
+</script>
+</body>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/abspos/orthogonal-positioned-grid-descendants-006.html b/tests/wpt/web-platform-tests/css/css-grid/abspos/orthogonal-positioned-grid-descendants-006.html
new file mode 100644
index 00000000000..c6772bef234
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/abspos/orthogonal-positioned-grid-descendants-006.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Positioned grid descendants</title>
+<link rel="author" title="Oriol Brufau" href="mailto:obrufau@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid/#abspos" title="9. Absolute Positioning">
+<meta name="assert" content="Checks that absolutely positioned orthogonal elements inside grid items are properly placed and sized when they have specific 'left' and 'top' offsets.">
+
+<link rel="stylesheet" href="support/positioned-grid-descendants.css" />
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+
+<body>
+<div id="log"></div>
+<script type="module">
+import {runTests} from "./support/positioned-grid-descendants.js";
+runTests({
+  left: 25,
+  top: 30,
+  right: "auto",
+  bottom: "auto",
+  orthogonal: true,
+});
+</script>
+</body>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/abspos/orthogonal-positioned-grid-descendants-007.html b/tests/wpt/web-platform-tests/css/css-grid/abspos/orthogonal-positioned-grid-descendants-007.html
new file mode 100644
index 00000000000..97851879f1e
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/abspos/orthogonal-positioned-grid-descendants-007.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Positioned grid descendants</title>
+<link rel="author" title="Oriol Brufau" href="mailto:obrufau@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid/#abspos" title="9. Absolute Positioning">
+<meta name="assert" content="Checks that absolutely positioned orthogonal elements inside grid items are properly placed and sized when they have specific 'left' and 'right' offsets and a static block position (top/bottom are 'auto').">
+
+<link rel="stylesheet" href="support/positioned-grid-descendants.css" />
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+
+<body>
+<div id="log"></div>
+<script type="module">
+import {runTests} from "./support/positioned-grid-descendants.js";
+runTests({
+  left: 25,
+  top: "auto",
+  right: 35,
+  bottom: "auto",
+  orthogonal: true,
+});
+</script>
+</body>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/abspos/orthogonal-positioned-grid-descendants-008.html b/tests/wpt/web-platform-tests/css/css-grid/abspos/orthogonal-positioned-grid-descendants-008.html
new file mode 100644
index 00000000000..965e87d99e2
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/abspos/orthogonal-positioned-grid-descendants-008.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Positioned grid descendants</title>
+<link rel="author" title="Oriol Brufau" href="mailto:obrufau@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid/#abspos" title="9. Absolute Positioning">
+<meta name="assert" content="Checks that absolutely positioned orthogonal elements inside grid items are properly placed and sized when they have specific 'left' and 'bottom' offsets.">
+
+<link rel="stylesheet" href="support/positioned-grid-descendants.css" />
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+
+<body>
+<div id="log"></div>
+<script type="module">
+import {runTests} from "./support/positioned-grid-descendants.js";
+runTests({
+  left: 25,
+  top: "auto",
+  right: "auto",
+  bottom: 40,
+  orthogonal: true,
+});
+</script>
+</body>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/abspos/orthogonal-positioned-grid-descendants-009.html b/tests/wpt/web-platform-tests/css/css-grid/abspos/orthogonal-positioned-grid-descendants-009.html
new file mode 100644
index 00000000000..beb259a9bea
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/abspos/orthogonal-positioned-grid-descendants-009.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Positioned grid descendants</title>
+<link rel="author" title="Oriol Brufau" href="mailto:obrufau@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid/#abspos" title="9. Absolute Positioning">
+<meta name="assert" content="Checks that absolutely positioned orthogonal elements inside grid items are properly placed and sized when they have specific 'top' and 'right' offsets.">
+
+<link rel="stylesheet" href="support/positioned-grid-descendants.css" />
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+
+<body>
+<div id="log"></div>
+<script type="module">
+import {runTests} from "./support/positioned-grid-descendants.js";
+runTests({
+  left: "auto",
+  top: 30,
+  right: 35,
+  bottom: "auto",
+  orthogonal: true,
+});
+</script>
+</body>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/abspos/orthogonal-positioned-grid-descendants-010.html b/tests/wpt/web-platform-tests/css/css-grid/abspos/orthogonal-positioned-grid-descendants-010.html
new file mode 100644
index 00000000000..f94bcca9235
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/abspos/orthogonal-positioned-grid-descendants-010.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Positioned grid descendants</title>
+<link rel="author" title="Oriol Brufau" href="mailto:obrufau@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid/#abspos" title="9. Absolute Positioning">
+<meta name="assert" content="Checks that absolutely positioned orthogonal elements inside grid items are properly placed and sized when they have specific 'top' and 'bottom' offsets and a static inline position (left/right are 'auto').">
+
+<link rel="stylesheet" href="support/positioned-grid-descendants.css" />
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+
+<body>
+<div id="log"></div>
+<script type="module">
+import {runTests} from "./support/positioned-grid-descendants.js";
+runTests({
+  left: "auto",
+  top: 30,
+  right: "auto",
+  bottom: 40,
+  orthogonal: true,
+});
+</script>
+</body>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/abspos/orthogonal-positioned-grid-descendants-011.html b/tests/wpt/web-platform-tests/css/css-grid/abspos/orthogonal-positioned-grid-descendants-011.html
new file mode 100644
index 00000000000..bcab0b9d474
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/abspos/orthogonal-positioned-grid-descendants-011.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Positioned grid descendants</title>
+<link rel="author" title="Oriol Brufau" href="mailto:obrufau@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid/#abspos" title="9. Absolute Positioning">
+<meta name="assert" content="Checks that absolutely positioned orthogonal elements inside grid items are properly placed and sized when they have specific 'right' and 'bottom' offsets.">
+
+<link rel="stylesheet" href="support/positioned-grid-descendants.css" />
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+
+<body>
+<div id="log"></div>
+<script type="module">
+import {runTests} from "./support/positioned-grid-descendants.js";
+runTests({
+  left: "auto",
+  top: "auto",
+  right: 35,
+  bottom: 40,
+  orthogonal: true,
+});
+</script>
+</body>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/abspos/orthogonal-positioned-grid-descendants-012.html b/tests/wpt/web-platform-tests/css/css-grid/abspos/orthogonal-positioned-grid-descendants-012.html
new file mode 100644
index 00000000000..1ac153a495e
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/abspos/orthogonal-positioned-grid-descendants-012.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Positioned grid descendants</title>
+<link rel="author" title="Oriol Brufau" href="mailto:obrufau@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid/#abspos" title="9. Absolute Positioning">
+<meta name="assert" content="Checks that absolutely positioned orthogonal elements inside grid items are properly placed and sized when they have specific 'left', 'top' and 'right' offsets.">
+
+<link rel="stylesheet" href="support/positioned-grid-descendants.css" />
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+
+<body>
+<div id="log"></div>
+<script type="module">
+import {runTests} from "./support/positioned-grid-descendants.js";
+runTests({
+  left: 25,
+  top: 30,
+  right: 35,
+  bottom: "auto",
+  orthogonal: true,
+});
+</script>
+</body>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/abspos/orthogonal-positioned-grid-descendants-013.html b/tests/wpt/web-platform-tests/css/css-grid/abspos/orthogonal-positioned-grid-descendants-013.html
new file mode 100644
index 00000000000..99400e69232
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/abspos/orthogonal-positioned-grid-descendants-013.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Positioned grid descendants</title>
+<link rel="author" title="Oriol Brufau" href="mailto:obrufau@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid/#abspos" title="9. Absolute Positioning">
+<meta name="assert" content="Checks that absolutely positioned orthogonal elements inside grid items are properly placed and sized when they have specific 'left', 'top' and 'bottom' offsets.">
+
+<link rel="stylesheet" href="support/positioned-grid-descendants.css" />
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+
+<body>
+<div id="log"></div>
+<script type="module">
+import {runTests} from "./support/positioned-grid-descendants.js";
+runTests({
+  left: 25,
+  top: 30,
+  right: "auto",
+  bottom: 40,
+  orthogonal: true,
+});
+</script>
+</body>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/abspos/orthogonal-positioned-grid-descendants-014.html b/tests/wpt/web-platform-tests/css/css-grid/abspos/orthogonal-positioned-grid-descendants-014.html
new file mode 100644
index 00000000000..a9c5408d976
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/abspos/orthogonal-positioned-grid-descendants-014.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Positioned grid descendants</title>
+<link rel="author" title="Oriol Brufau" href="mailto:obrufau@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid/#abspos" title="9. Absolute Positioning">
+<meta name="assert" content="Checks that absolutely positioned orthogonal elements inside grid items are properly placed and sized when they have specific 'left', 'right' and 'bottom' offsets.">
+
+<link rel="stylesheet" href="support/positioned-grid-descendants.css" />
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+
+<body>
+<div id="log"></div>
+<script type="module">
+import {runTests} from "./support/positioned-grid-descendants.js";
+runTests({
+  left: 25,
+  top: "auto",
+  right: 35,
+  bottom: 40,
+  orthogonal: true,
+});
+</script>
+</body>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/abspos/orthogonal-positioned-grid-descendants-015.html b/tests/wpt/web-platform-tests/css/css-grid/abspos/orthogonal-positioned-grid-descendants-015.html
new file mode 100644
index 00000000000..d75664ded33
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/abspos/orthogonal-positioned-grid-descendants-015.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Positioned grid descendants</title>
+<link rel="author" title="Oriol Brufau" href="mailto:obrufau@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid/#abspos" title="9. Absolute Positioning">
+<meta name="assert" content="Checks that absolutely positioned orthogonal elements inside grid items are properly placed and sized when they have specific 'top', 'right' and 'bottom' offsets.">
+
+<link rel="stylesheet" href="support/positioned-grid-descendants.css" />
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+
+<body>
+<div id="log"></div>
+<script type="module">
+import {runTests} from "./support/positioned-grid-descendants.js";
+runTests({
+  left: "auto",
+  top: 30,
+  right: 35,
+  bottom: 40,
+  orthogonal: true,
+});
+</script>
+</body>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/abspos/orthogonal-positioned-grid-descendants-016.html b/tests/wpt/web-platform-tests/css/css-grid/abspos/orthogonal-positioned-grid-descendants-016.html
new file mode 100644
index 00000000000..a2ce6b99ab1
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/abspos/orthogonal-positioned-grid-descendants-016.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Positioned grid descendants</title>
+<link rel="author" title="Oriol Brufau" href="mailto:obrufau@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid/#abspos" title="9. Absolute Positioning">
+<meta name="assert" content="Checks that absolutely positioned orthogonal elements inside grid items are properly placed and sized when they have specific 'left, 'top', 'right' and 'bottom' offsets.">
+
+<link rel="stylesheet" href="support/positioned-grid-descendants.css" />
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+
+<body>
+<div id="log"></div>
+<script type="module">
+import {runTests} from "./support/positioned-grid-descendants.js";
+runTests({
+  left: 25,
+  top: 30,
+  right: 35,
+  bottom: 40,
+  orthogonal: true,
+});
+</script>
+</body>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-descendants-001.html b/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-descendants-001.html
new file mode 100644
index 00000000000..fddb5d81754
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-descendants-001.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Positioned grid descendants</title>
+<link rel="author" title="Oriol Brufau" href="mailto:obrufau@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid/#abspos" title="9. Absolute Positioning">
+<meta name="assert" content="Checks that absolutely positioned elements inside grid items are properly placed and sized when they have a static position (left/rigth and top/bottom are 'auto').">
+
+<link rel="stylesheet" href="support/positioned-grid-descendants.css" />
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+
+<body>
+<div id="log"></div>
+<script type="module">
+import {runTests} from "./support/positioned-grid-descendants.js";
+runTests({
+  left: "auto",
+  top: "auto",
+  right: "auto",
+  bottom: "auto",
+});
+</script>
+</body>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-descendants-002.html b/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-descendants-002.html
new file mode 100644
index 00000000000..987bd46bd3c
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-descendants-002.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Positioned grid descendants</title>
+<link rel="author" title="Oriol Brufau" href="mailto:obrufau@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid/#abspos" title="9. Absolute Positioning">
+<meta name="assert" content="Checks that absolutely positioned elements inside grid items are properly placed and sized when they have a specific 'left' offset and a static block position (top/bottom are 'auto').">
+
+<link rel="stylesheet" href="support/positioned-grid-descendants.css" />
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+
+<body>
+<div id="log"></div>
+<script type="module">
+import {runTests} from "./support/positioned-grid-descendants.js";
+runTests({
+  left: 25,
+  top: "auto",
+  right: "auto",
+  bottom: "auto",
+});
+</script>
+</body>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-descendants-003.html b/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-descendants-003.html
new file mode 100644
index 00000000000..ca3653959af
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-descendants-003.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Positioned grid descendants</title>
+<link rel="author" title="Oriol Brufau" href="mailto:obrufau@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid/#abspos" title="9. Absolute Positioning">
+<meta name="assert" content="Checks that absolutely positioned elements inside grid items are properly placed and sized when they have a specific 'top' offset and a static inline position (left/right are 'auto').">
+
+<link rel="stylesheet" href="support/positioned-grid-descendants.css" />
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+
+<body>
+<div id="log"></div>
+<script type="module">
+import {runTests} from "./support/positioned-grid-descendants.js";
+runTests({
+  left: "auto",
+  top: 30,
+  right: "auto",
+  bottom: "auto",
+});
+</script>
+</body>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-descendants-004.html b/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-descendants-004.html
new file mode 100644
index 00000000000..1710781580a
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-descendants-004.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Positioned grid descendants</title>
+<link rel="author" title="Oriol Brufau" href="mailto:obrufau@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid/#abspos" title="9. Absolute Positioning">
+<meta name="assert" content="Checks that absolutely positioned elements inside grid items are properly placed and sized when they have specific 'right' offset and a static block position (top/bottom are 'auto').">
+
+<link rel="stylesheet" href="support/positioned-grid-descendants.css" />
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+
+<body>
+<div id="log"></div>
+<script type="module">
+import {runTests} from "./support/positioned-grid-descendants.js";
+runTests({
+  left: "auto",
+  top: "auto",
+  right: 35,
+  bottom: "auto",
+});
+</script>
+</body>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-descendants-005.html b/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-descendants-005.html
new file mode 100644
index 00000000000..00d1299977f
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-descendants-005.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Positioned grid descendants</title>
+<link rel="author" title="Oriol Brufau" href="mailto:obrufau@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid/#abspos" title="9. Absolute Positioning">
+<meta name="assert" content="Checks that absolutely positioned elements inside grid items are properly placed and sized when they have specific 'bottom' offset and a static inline position (left/right are 'auto').">
+
+<link rel="stylesheet" href="support/positioned-grid-descendants.css" />
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+
+<body>
+<div id="log"></div>
+<script type="module">
+import {runTests} from "./support/positioned-grid-descendants.js";
+runTests({
+  left: "auto",
+  right: "auto",
+  top: "auto",
+  bottom: 40,
+});
+</script>
+</body>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-descendants-006.html b/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-descendants-006.html
new file mode 100644
index 00000000000..6c856ccd91d
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-descendants-006.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Positioned grid descendants</title>
+<link rel="author" title="Oriol Brufau" href="mailto:obrufau@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid/#abspos" title="9. Absolute Positioning">
+<meta name="assert" content="Checks that absolutely positioned elements inside grid items are properly placed and sized when they have specific 'left' and 'top' offsets.">
+
+<link rel="stylesheet" href="support/positioned-grid-descendants.css" />
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+
+<body>
+<div id="log"></div>
+<script type="module">
+import {runTests} from "./support/positioned-grid-descendants.js";
+runTests({
+  left: 25,
+  top: 30,
+  right: "auto",
+  bottom: "auto",
+});
+</script>
+</body>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-descendants-007.html b/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-descendants-007.html
new file mode 100644
index 00000000000..97c489cd5da
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-descendants-007.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Positioned grid descendants</title>
+<link rel="author" title="Oriol Brufau" href="mailto:obrufau@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid/#abspos" title="9. Absolute Positioning">
+<meta name="assert" content="Checks that absolutely positioned elements inside grid items are properly placed and sized when they have specific 'left' and 'right' offsets and a static block position (top/bottom are 'auto').">
+
+<link rel="stylesheet" href="support/positioned-grid-descendants.css" />
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+
+<body>
+<div id="log"></div>
+<script type="module">
+import {runTests} from "./support/positioned-grid-descendants.js";
+runTests({
+  left: 25,
+  top: "auto",
+  right: 35,
+  bottom: "auto",
+});
+</script>
+</body>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-descendants-008.html b/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-descendants-008.html
new file mode 100644
index 00000000000..3abcd7b9031
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-descendants-008.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Positioned grid descendants</title>
+<link rel="author" title="Oriol Brufau" href="mailto:obrufau@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid/#abspos" title="9. Absolute Positioning">
+<meta name="assert" content="Checks that absolutely positioned elements inside grid items are properly placed and sized when they have specific 'left' and 'bottom' offsets.">
+
+<link rel="stylesheet" href="support/positioned-grid-descendants.css" />
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+
+<body>
+<div id="log"></div>
+<script type="module">
+import {runTests} from "./support/positioned-grid-descendants.js";
+runTests({
+  left: 25,
+  top: "auto",
+  right: "auto",
+  bottom: 40,
+});
+</script>
+</body>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-descendants-009.html b/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-descendants-009.html
new file mode 100644
index 00000000000..09fb58e5adf
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-descendants-009.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Positioned grid descendants</title>
+<link rel="author" title="Oriol Brufau" href="mailto:obrufau@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid/#abspos" title="9. Absolute Positioning">
+<meta name="assert" content="Checks that absolutely positioned elements inside grid items are properly placed and sized when they have specific 'top' and 'right' offsets.">
+
+<link rel="stylesheet" href="support/positioned-grid-descendants.css" />
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+
+<body>
+<div id="log"></div>
+<script type="module">
+import {runTests} from "./support/positioned-grid-descendants.js";
+runTests({
+  left: "auto",
+  top: 30,
+  right: 35,
+  bottom: "auto",
+});
+</script>
+</body>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-descendants-010.html b/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-descendants-010.html
new file mode 100644
index 00000000000..04cd3e99856
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-descendants-010.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Positioned grid descendants</title>
+<link rel="author" title="Oriol Brufau" href="mailto:obrufau@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid/#abspos" title="9. Absolute Positioning">
+<meta name="assert" content="Checks that absolutely positioned elements inside grid items are properly placed and sized when they have specific 'top' and 'bottom' offsets and a static inline position (left/right are 'auto').">
+
+<link rel="stylesheet" href="support/positioned-grid-descendants.css" />
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+
+<body>
+<div id="log"></div>
+<script type="module">
+import {runTests} from "./support/positioned-grid-descendants.js";
+runTests({
+  left: "auto",
+  top: 30,
+  right: "auto",
+  bottom: 40,
+});
+</script>
+</body>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-descendants-011.html b/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-descendants-011.html
new file mode 100644
index 00000000000..e7274e55d6e
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-descendants-011.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Positioned grid descendants</title>
+<link rel="author" title="Oriol Brufau" href="mailto:obrufau@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid/#abspos" title="9. Absolute Positioning">
+<meta name="assert" content="Checks that absolutely positioned elements inside grid items are properly placed and sized when they have specific 'right' and 'bottom' offsets.">
+
+<link rel="stylesheet" href="support/positioned-grid-descendants.css" />
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+
+<body>
+<div id="log"></div>
+<script type="module">
+import {runTests} from "./support/positioned-grid-descendants.js";
+runTests({
+  left: "auto",
+  top: "auto",
+  right: 35,
+  bottom: 40,
+});
+</script>
+</body>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-descendants-012.html b/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-descendants-012.html
new file mode 100644
index 00000000000..45e6a124845
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-descendants-012.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Positioned grid descendants</title>
+<link rel="author" title="Oriol Brufau" href="mailto:obrufau@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid/#abspos" title="9. Absolute Positioning">
+<meta name="assert" content="Checks that absolutely positioned elements inside grid items are properly placed and sized when they have specific 'left', 'top' and 'right' offsets.">
+
+<link rel="stylesheet" href="support/positioned-grid-descendants.css" />
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+
+<body>
+<div id="log"></div>
+<script type="module">
+import {runTests} from "./support/positioned-grid-descendants.js";
+runTests({
+  left: 25,
+  top: 30,
+  right: 35,
+  bottom: "auto",
+});
+</script>
+</body>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-descendants-013.html b/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-descendants-013.html
new file mode 100644
index 00000000000..29e83c33059
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-descendants-013.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Positioned grid descendants</title>
+<link rel="author" title="Oriol Brufau" href="mailto:obrufau@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid/#abspos" title="9. Absolute Positioning">
+<meta name="assert" content="Checks that absolutely positioned elements inside grid items are properly placed and sized when they have specific 'left', 'top' and 'bottom' offsets.">
+
+<link rel="stylesheet" href="support/positioned-grid-descendants.css" />
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+
+<body>
+<div id="log"></div>
+<script type="module">
+import {runTests} from "./support/positioned-grid-descendants.js";
+runTests({
+  left: 25,
+  top: 30,
+  right: "auto",
+  bottom: 40,
+});
+</script>
+</body>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-descendants-014.html b/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-descendants-014.html
new file mode 100644
index 00000000000..567b3092d5b
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-descendants-014.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Positioned grid descendants</title>
+<link rel="author" title="Oriol Brufau" href="mailto:obrufau@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid/#abspos" title="9. Absolute Positioning">
+<meta name="assert" content="Checks that absolutely positioned elements inside grid items are properly placed and sized when they have specific 'left', 'right' and 'bottom' offsets.">
+
+<link rel="stylesheet" href="support/positioned-grid-descendants.css" />
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+
+<body>
+<div id="log"></div>
+<script type="module">
+import {runTests} from "./support/positioned-grid-descendants.js";
+runTests({
+  left: 25,
+  top: "auto",
+  right: 35,
+  bottom: 40,
+});
+</script>
+</body>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-descendants-015.html b/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-descendants-015.html
new file mode 100644
index 00000000000..c3c5d411a1d
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-descendants-015.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Positioned grid descendants</title>
+<link rel="author" title="Oriol Brufau" href="mailto:obrufau@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid/#abspos" title="9. Absolute Positioning">
+<meta name="assert" content="Checks that absolutely positioned elements inside grid items are properly placed and sized when they have specific 'top', 'right' and 'bottom' offsets.">
+
+<link rel="stylesheet" href="support/positioned-grid-descendants.css" />
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+
+<body>
+<div id="log"></div>
+<script type="module">
+import {runTests} from "./support/positioned-grid-descendants.js";
+runTests({
+  left: "auto",
+  top: 30,
+  right: 35,
+  bottom: 40,
+});
+</script>
+</body>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-descendants-016.html b/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-descendants-016.html
new file mode 100644
index 00000000000..dfa34eb9c39
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-descendants-016.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Positioned grid descendants</title>
+<link rel="author" title="Oriol Brufau" href="mailto:obrufau@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid/#abspos" title="9. Absolute Positioning">
+<meta name="assert" content="Checks that absolutely positioned elements inside grid items are properly placed and sized when they have specific 'left, 'top', 'right' and 'bottom' offsets.">
+
+<link rel="stylesheet" href="support/positioned-grid-descendants.css" />
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+
+<body>
+<div id="log"></div>
+<script type="module">
+import {runTests} from "./support/positioned-grid-descendants.js";
+runTests({
+  left: 25,
+  top: 30,
+  right: 35,
+  bottom: 40,
+});
+</script>
+</body>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/abspos/support/positioned-grid-descendants.css b/tests/wpt/web-platform-tests/css/css-grid/abspos/support/positioned-grid-descendants.css
new file mode 100644
index 00000000000..9fa29a25ae3
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/abspos/support/positioned-grid-descendants.css
@@ -0,0 +1,25 @@
+.grid {
+  display: grid;
+  grid: 150px 100px / 200px 300px;
+  margin: 1px 2px 3px 4px;
+  padding: 20px 15px 10px 5px;
+  border-width: 9px 3px 12px 6px;
+  border-style: solid;
+  width: 550px;
+  height: 400px;
+  position: relative;
+  font: 25px/1 Ahem;
+}
+.abspos {
+  position: absolute;
+  display: inline;
+}
+.orthogonal {
+  writing-mode: vertical-lr;
+}
+.grid > :nth-child(1) > .abspos {
+  color: cyan;
+}
+.grid > :nth-child(2) > .abspos {
+  color: yellow;
+}
diff --git a/tests/wpt/web-platform-tests/css/css-grid/abspos/support/positioned-grid-descendants.js b/tests/wpt/web-platform-tests/css/css-grid/abspos/support/positioned-grid-descendants.js
new file mode 100644
index 00000000000..d8fc60be555
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/abspos/support/positioned-grid-descendants.js
@@ -0,0 +1,70 @@
+// Track sizes, including preceding padding and following remaining space
+const colSizes = [5, 200, 300, 65];
+const rowSizes = [20, 150, 100, 160];
+
+// Calculate track positions
+const colOffsets = [0];
+const rowOffsets = [0];
+for (const size of colSizes)
+  colOffsets.push(size + colOffsets[colOffsets.length - 1]);
+for (const size of rowSizes)
+  rowOffsets.push(size + rowOffsets[rowOffsets.length - 1]);
+
+export function runTests({left, top, right, bottom, orthogonal = false}) {
+  // Iterate all pairs of grid lines, where 0 and 4 represent "auto".
+  for (let colStart = 0; colStart < 4; ++colStart)
+  for (let colEnd = colStart + 1; colEnd <= 4; ++colEnd)
+  for (let rowStart = 0; rowStart < 4; ++rowStart)
+  for (let rowEnd = rowStart + 1; rowEnd <= 4; ++rowEnd)
+  {
+    // Create a 2x2 grid with two grid items, each one containing an abspos.
+    const grid = document.createElement("div");
+    grid.className = "grid";
+    for (let i = 1; i <= 2; ++i) {
+      // Create a grid item with some content before the abspos, so that the static
+      // position is shifted 50px to the right and 25px to the bottom.
+      const gridItem = document.createElement("div");
+      gridItem.style.gridArea = `${i} / ${i}`;
+      grid.appendChild(gridItem);
+      gridItem.innerHTML = "X<br />XX";
+
+      // Create an abspos with content of 50px inline size, 25px block size.
+      const absPos = document.createElement("div");
+      gridItem.appendChild(absPos);
+      absPos.className = "abspos";
+      absPos.textContent = "XX";
+      if (orthogonal) absPos.classList.add("orthogonal");
+
+      // Let the containing block be the grid area, and set offsets.
+      Object.assign(absPos.style, {
+        gridColumnStart: colStart || "auto",
+        gridColumnEnd: colEnd % 4 || "auto",
+        gridRowStart: rowStart || "auto",
+        gridRowEnd: rowEnd % 4 || "auto",
+        left: left == "auto" ? left : left + "px",
+        top: top == "auto" ? top : top + "px",
+        right: right == "auto" ? right : right + "px",
+        bottom: bottom == "auto" ? bottom : bottom + "px",
+      });
+
+      // Calculate expected position and size.
+      const expectedWidth =
+        left == "auto" || right == "auto" ? 25 * (orthogonal ? 1 : 2) :
+        Math.max(0, colOffsets[colEnd] - colOffsets[colStart] - left - right);
+      const expectedHeight =
+        top == "auto" || bottom == "auto" ? 25 * (orthogonal ? 2 : 1) :
+        Math.max(0, rowOffsets[rowEnd] - rowOffsets[rowStart] - top - bottom);
+      const offsetX =
+        left != "auto" ? colOffsets[colStart] + left :
+        right != "auto" ? colOffsets[colEnd] - right - expectedWidth :
+        colOffsets[i] + 25*2;
+      const offsetY =
+        top != "auto" ? rowOffsets[rowStart] + top :
+        bottom != "auto" ? rowOffsets[rowEnd] - bottom - expectedHeight :
+        rowOffsets[i] + 25;
+      Object.assign(absPos.dataset, {expectedWidth, expectedHeight, offsetX, offsetY});
+    }
+    document.body.appendChild(grid);
+  }
+  checkLayout(".grid");
+}
diff --git a/tests/wpt/web-platform-tests/css/css-multicol/float-with-line-after-spanner-ref.html b/tests/wpt/web-platform-tests/css/css-multicol/float-with-line-after-spanner-ref.html
new file mode 100644
index 00000000000..7c33b48f5e6
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-multicol/float-with-line-after-spanner-ref.html
@@ -0,0 +1,7 @@
+<!DOCTYPE html>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<p>The word 'PASS' should be seen below, inside a blue square.</p>
+<div style="font-size:50px; width:225px; height:225px; line-height:60px; color:white; background:blue;">
+  <div style="height:165px;"></div>
+  PASS
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-multicol/float-with-line-after-spanner.html b/tests/wpt/web-platform-tests/css/css-multicol/float-with-line-after-spanner.html
new file mode 100644
index 00000000000..2351fb4bec9
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-multicol/float-with-line-after-spanner.html
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<link rel="help" href="https://www.w3.org/TR/css-multicol-1/#spanning-columns">
+<link rel="match" href="float-with-line-after-spanner-ref.html">
+<p>The word 'PASS' should be seen below, inside a blue square.</p>
+<div style="columns:1; font-size:50px; width:225px; line-height:60px; color:white; background:blue;">
+  <div style="float:left; padding-top:165px;">PASS</div>
+  <div style="height:65px;"></div>
+  <div style="column-span:all;"></div>
+  <div></div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-position/position-sticky-hyperlink-ref.html b/tests/wpt/web-platform-tests/css/css-position/position-sticky-hyperlink-ref.html
index 74a48fb5070..0f8100e8888 100644
--- a/tests/wpt/web-platform-tests/css/css-position/position-sticky-hyperlink-ref.html
+++ b/tests/wpt/web-platform-tests/css/css-position/position-sticky-hyperlink-ref.html
@@ -15,6 +15,7 @@ body {
 .positioned {
   position: relative;
   top: 100px;
+  will-change: transform;
 }
 
 .spacer {
diff --git a/tests/wpt/web-platform-tests/css/css-position/position-sticky-hyperlink.html b/tests/wpt/web-platform-tests/css/css-position/position-sticky-hyperlink.html
index 466876ee28d..fc1c2fce0aa 100644
--- a/tests/wpt/web-platform-tests/css/css-position/position-sticky-hyperlink.html
+++ b/tests/wpt/web-platform-tests/css/css-position/position-sticky-hyperlink.html
@@ -18,6 +18,7 @@ body {
 .sticky {
   position: sticky;
   top: 0;
+  will-change: transform;
 }
 
 .spacer {
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio-affects-container-width-when-height-changes.html b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio-affects-container-width-when-height-changes.html
new file mode 100644
index 00000000000..0dbbb2f9404
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio-affects-container-width-when-height-changes.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<link rel="help" href="https://www.w3.org/TR/css-sizing-3/#intrinsic-sizes">
+<p>There should be a green square below, and no red.</p>
+<div id="container" style="height:200px;">
+  <div style="height:100%;" data-expected-height="100">
+    <div style="float:left; height:100%; background:red;" data-expected-width="100" data-expected-height="100">
+      <!-- The image is a 1x1 transparent one. -->
+      <img style="display:block; height:100%; background:green;" src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-expected-width="100" data-expected-height="100">
+    </div>
+  </div>
+</div>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+<script>
+  test(()=> {
+      document.body.offsetTop;
+      document.getElementById("container").style.height = "100px";
+      checkLayout("#container");
+  }, "Changing height should affect the descendant widths, due to aspect ratio");
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-transforms/preserve3d-nested-perspective-ref.html b/tests/wpt/web-platform-tests/css/css-transforms/preserve3d-nested-perspective-ref.html
new file mode 100644
index 00000000000..df0bfc417df
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-transforms/preserve3d-nested-perspective-ref.html
@@ -0,0 +1,13 @@
+<!doctype html>
+<title>CSS Test Reference</title>
+<link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez">
+<link rel="author" href="https://mozilla.org" title="Mozilla">
+<style>
+  html, body { margin: 0 }
+  #box {
+    width: 100px;
+    height: 100px;
+    background: green;
+  }
+</style>
+<div id="box"></div>
diff --git a/tests/wpt/web-platform-tests/css/css-transforms/preserve3d-nested-perspective.html b/tests/wpt/web-platform-tests/css/css-transforms/preserve3d-nested-perspective.html
new file mode 100644
index 00000000000..368784c74f5
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-transforms/preserve3d-nested-perspective.html
@@ -0,0 +1,24 @@
+<!doctype html>
+<title>CSS Test: nested preserve-3d and perspective without transformed items</title>
+<link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez">
+<link rel="author" href="https://mozilla.org" title="Mozilla">
+<link rel="help" href="https://drafts.csswg.org/css-transforms-2/#perspective">
+<link rel="help" href="https://drafts.csswg.org/css-transforms-2/#transform-style-property">
+<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1505222">
+<link rel="match" href="preserve3d-nested-perspective-ref.html">
+<style>
+  html, body { margin: 0 }
+  #box {
+    width: 100px;
+    height: 100px;
+    background: green;
+  }
+</style>
+<!-- Since we don't specify any transform, this should render just a 100x100px red box -->
+<div style="perspective: 1200px">
+  <div style="transform-style: preserve-3d">
+    <div style="transform-style: flat">
+      <div id="box" style="transform-style: preserve-3d"></div>
+    </div>
+  </div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-values/calc-unit-analysis.html b/tests/wpt/web-platform-tests/css/css-values/calc-unit-analysis.html
index 20eab22bf7c..7508a392416 100644
--- a/tests/wpt/web-platform-tests/css/css-values/calc-unit-analysis.html
+++ b/tests/wpt/web-platform-tests/css/css-values/calc-unit-analysis.html
@@ -10,7 +10,7 @@
   <script src="/resources/testharnessreport.js"></script>
 <style id="style"></style>
 </head>
-<body onload="run()">
+<body>
 <div id=log></div>
 <div id="test"></div>
 <script>
diff --git a/tests/wpt/web-platform-tests/css/selectors/invalidation/insert-sibling-001.html b/tests/wpt/web-platform-tests/css/selectors/invalidation/insert-sibling-001.html
new file mode 100644
index 00000000000..fa966d3f25a
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/selectors/invalidation/insert-sibling-001.html
@@ -0,0 +1,39 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <title>CSS Selectors Invalidation: insert sibling</title>
+  <link rel="help" href="https://drafts.csswg.org/selectors-4/#adjacent-sibling-combinators">
+  <meta name="assert" content="This tests that the + next-sibling selector is effective">
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <style>
+    .c { background-color: blue; }
+    .a + * + .c { background-color: green; }
+  </style>
+</head>
+<body>
+  <div>
+    <div id="first" class="a"></div>
+    <div></div>
+    <div id="target" class="c"></div>
+  </div>
+  <script>
+    'use strict';
+    const green = 'rgb(0, 128, 0)';
+    const blue = 'rgb(0, 0, 255)';
+
+    test(function() {
+      const first = document.getElementById('first');
+      const target = document.getElementById('target');
+      const parent = first.parentElement;
+      assert_equals(getComputedStyle(target).backgroundColor, green, "initial color");
+
+      parent.removeChild(first);
+      assert_equals(getComputedStyle(target).backgroundColor, blue, "color after removal");
+
+      parent.insertBefore(first, parent.firstChild);
+      assert_equals(getComputedStyle(target).backgroundColor, green, "color after insert")
+    }, "Remove/Insert earlier sibling");
+  </script>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/selectors/invalidation/insert-sibling-002.html b/tests/wpt/web-platform-tests/css/selectors/invalidation/insert-sibling-002.html
new file mode 100644
index 00000000000..7e1eac37ea9
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/selectors/invalidation/insert-sibling-002.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <title>CSS Selectors Invalidation: insert adjacent sibling of parent</title>
+  <link rel="help" href="https://drafts.csswg.org/selectors-4/#adjacent-sibling-combinators">
+  <meta name="assert" content="This tests that the + next-sibling selector is effective">
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <style>
+    .d { background-color: blue; }
+
+    .a + .c > .d { background-color: green; }
+  </style>
+</head>
+<body>
+  <div>
+    <div id="first" class="a"></div>
+    <div class="c">
+      <div id="target" class="d"></div>
+    </div>
+  </div>
+  <script>
+    'use strict';
+    const green = 'rgb(0, 128, 0)';
+    const blue = 'rgb(0, 0, 255)';
+
+    test(function() {
+      const first = document.getElementById('first');
+      const target = document.getElementById('target');
+      const parent = first.parentElement;
+      assert_equals(getComputedStyle(target).backgroundColor, green, "initial color");
+
+      parent.removeChild(first);
+      assert_equals(getComputedStyle(target).backgroundColor, blue, "color after removal");
+
+      parent.insertBefore(first, parent.firstChild);
+      assert_equals(getComputedStyle(target).backgroundColor, green, "color after insert")
+  }, "Remove/Insert adjacent sibling of parent");
+  </script>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/selectors/invalidation/insert-sibling-003.html b/tests/wpt/web-platform-tests/css/selectors/invalidation/insert-sibling-003.html
new file mode 100644
index 00000000000..c7c51eaf6a8
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/selectors/invalidation/insert-sibling-003.html
@@ -0,0 +1,44 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <title>CSS Selectors Invalidation: insert sibling of ancestor</title>
+  <link rel="help" href="https://drafts.csswg.org/selectors-4/#adjacent-sibling-combinators">
+  <meta name="assert" content="This tests that the + next-sibling selector is effective">
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <style>
+    .c * { background-color: blue; }
+
+    .a + * + .c * { background-color: green; }
+  </style>
+</head>
+<body>
+  <div>
+    <div id="first" class="a"></div>
+    <div></div>
+    <div class="c">
+      <div>
+        <div id="target"></div>
+      </div>
+    </div>
+  </div>
+  <script>
+    'use strict';
+    const green = 'rgb(0, 128, 0)';
+    const blue = 'rgb(0, 0, 255)';
+
+    test(function() {
+      const first = document.getElementById('first');
+      const target = document.getElementById('target');
+      const parent = first.parentElement;
+      assert_equals(getComputedStyle(target).backgroundColor, green, "initial color");
+
+      parent.removeChild(first);
+      assert_equals(getComputedStyle(target).backgroundColor, blue, "color after removal");
+
+      parent.insertBefore(first, parent.firstChild);
+      assert_equals(getComputedStyle(target).backgroundColor, green, "color after insert")
+  }, "Remove/Insert earlier sibling of ancestor");
+  </script>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/selectors/invalidation/insert-sibling-004.html b/tests/wpt/web-platform-tests/css/selectors/invalidation/insert-sibling-004.html
new file mode 100644
index 00000000000..aa3fb1c9fc6
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/selectors/invalidation/insert-sibling-004.html
@@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <title>CSS Selectors Invalidation: insert sibling of parent</title>
+  <link rel="help" href="https://drafts.csswg.org/selectors-4/#general-sibling-combinators">
+  <meta name="assert" content="This tests that the ~ subsequent-sibling selector is effective">
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <style>
+    span { background-color: blue; }
+
+    .a ~ .c > span { background-color: green; }
+  </style>
+</head>
+<body>
+  <div>
+    <div id="first" class="a"></div>
+    <div></div>
+    <div></div>
+    <div class="c">
+      <span id="target"></span>
+    </div>
+  </div>
+  <script>
+    'use strict';
+    const green = 'rgb(0, 128, 0)';
+    const blue = 'rgb(0, 0, 255)';
+
+    test(function() {
+      const first = document.getElementById('first');
+      const target = document.getElementById('target');
+      const parent = first.parentElement;
+      assert_equals(getComputedStyle(target).backgroundColor, green, "initial color");
+
+      parent.removeChild(first);
+      assert_equals(getComputedStyle(target).backgroundColor, blue, "color after removal");
+
+      parent.insertBefore(first, parent.firstChild);
+      assert_equals(getComputedStyle(target).backgroundColor, green, "color after insert")
+  }, "Remove/Insert earlier sibling of parent");
+  </script>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/dom/collections/HTMLCollection-as-proto-length-get-throws.html b/tests/wpt/web-platform-tests/dom/collections/HTMLCollection-as-proto-length-get-throws.html
deleted file mode 100644
index 225c9e61a38..00000000000
--- a/tests/wpt/web-platform-tests/dom/collections/HTMLCollection-as-proto-length-get-throws.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<!doctype html>
-<meta charset=utf-8>
-<title>Make sure browsers throw when getting .length on some random object whose proto is an HTMLCollection</title>
-<script src=/resources/testharness.js></script>
-<script src=/resources/testharnessreport.js></script>
-<script>
-test(function() {
-  var obj = Object.create(document.getElementsByTagName("script"));
-  assert_throws(new TypeError(), function() {
-    obj.length;
-  });
-}, "HTMLcollection as a prototype should not allow getting .length on the base object")
-</script>
diff --git a/tests/wpt/web-platform-tests/dom/collections/HTMLCollection-as-prototype.html b/tests/wpt/web-platform-tests/dom/collections/HTMLCollection-as-prototype.html
new file mode 100644
index 00000000000..75546a77c5e
--- /dev/null
+++ b/tests/wpt/web-platform-tests/dom/collections/HTMLCollection-as-prototype.html
@@ -0,0 +1,29 @@
+<!doctype html>
+<meta charset=utf-8>
+<title>Objects whose prototype is an HTMLCollection</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<div id=log></div>
+<script>
+test(function() {
+  var obj = Object.create(document.getElementsByTagName("script"));
+  assert_throws(new TypeError(), function() {
+    obj.length;
+  });
+}, "HTMLCollection as a prototype should not allow getting .length on the base object")
+
+test(function() {
+  var element = document.createElement("p");
+  element.id = "named";
+  document.body.appendChild(element);
+  this.add_cleanup(function() { element.remove() });
+
+  var collection = document.getElementsByTagName("p");
+  assert_equals(collection.named, element);
+  var object = Object.create(collection);
+  assert_equals(object.named, element);
+  object.named = "foo";
+  assert_equals(object.named, "foo");
+  assert_equals(collection.named, element);
+}, "HTMLCollection as a prototype and setting own properties")
+</script>
diff --git a/tests/wpt/web-platform-tests/encoding/resources/single-byte-raw.py b/tests/wpt/web-platform-tests/encoding/resources/single-byte-raw.py
index b4a6c90405e..494f37a185d 100644
--- a/tests/wpt/web-platform-tests/encoding/resources/single-byte-raw.py
+++ b/tests/wpt/web-platform-tests/encoding/resources/single-byte-raw.py
@@ -1,3 +1,3 @@
 def main(request, response):
   response.headers.set("Content-Type", "text/plain;charset=" + request.GET.first("label"))
-  response.content = "".join(chr(byte) for byte in xrange(255))
+  response.content = "".join(chr(byte) for byte in range(255))
diff --git a/tests/wpt/web-platform-tests/feature-policy/reporting/image.bmp b/tests/wpt/web-platform-tests/feature-policy/reporting/image.bmp
new file mode 100644
index 00000000000..f2b88690fcf
Binary files /dev/null and b/tests/wpt/web-platform-tests/feature-policy/reporting/image.bmp differ
diff --git a/tests/wpt/web-platform-tests/feature-policy/reporting/legacy-image-formats-reporting.html b/tests/wpt/web-platform-tests/feature-policy/reporting/legacy-image-formats-reporting.html
new file mode 100644
index 00000000000..6cd2e752eb9
--- /dev/null
+++ b/tests/wpt/web-platform-tests/feature-policy/reporting/legacy-image-formats-reporting.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <script src='/resources/testharness.js'></script>
+  <script src='/resources/testharnessreport.js'></script>
+</head>
+<body>
+  <img src="image.bmp">
+  <script>
+    var check_report_format = (reports, observer) => {
+      let report = reports[0];
+      assert_equals(report.type, "feature-policy-violation");
+      assert_equals(report.url, document.location.href);
+      assert_equals(report.body.featureId, "legacy-image-formats");
+      assert_equals(report.body.disposition, "enforce");
+    };
+
+    async_test(t => {
+      new ReportingObserver(t.step_func_done(check_report_format),
+        {types: ['feature-policy-violation'], buffered: true}).observe();
+    }, "Unsized-media Report Format");
+  </script>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/feature-policy/reporting/legacy-image-formats-reporting.html.headers b/tests/wpt/web-platform-tests/feature-policy/reporting/legacy-image-formats-reporting.html.headers
new file mode 100644
index 00000000000..1003c32a445
--- /dev/null
+++ b/tests/wpt/web-platform-tests/feature-policy/reporting/legacy-image-formats-reporting.html.headers
@@ -0,0 +1 @@
+Feature-Policy: legacy-image-formats 'none'
diff --git a/tests/wpt/web-platform-tests/interfaces/css-pseudo.idl b/tests/wpt/web-platform-tests/interfaces/css-pseudo.idl
index e16e66d5a3d..c51f2217f34 100644
--- a/tests/wpt/web-platform-tests/interfaces/css-pseudo.idl
+++ b/tests/wpt/web-platform-tests/interfaces/css-pseudo.idl
@@ -6,6 +6,7 @@
 [Exposed=Window]
 interface CSSPseudoElement {
     readonly attribute CSSOMString type;
+    readonly attribute Element element;
     readonly attribute CSSStyleDeclaration style;
 };
 
diff --git a/tests/wpt/web-platform-tests/interfaces/picture-in-picture.idl b/tests/wpt/web-platform-tests/interfaces/picture-in-picture.idl
index c7bc249dffc..2e89cfd8979 100644
--- a/tests/wpt/web-platform-tests/interfaces/picture-in-picture.idl
+++ b/tests/wpt/web-platform-tests/interfaces/picture-in-picture.idl
@@ -18,7 +18,7 @@ partial interface Document {
   [NewObject] Promise<void> exitPictureInPicture();
 };
 
-partial interface DocumentOrShadowRoot {
+partial interface mixin DocumentOrShadowRoot {
   readonly attribute Element? pictureInPictureElement;
 };
 
diff --git a/tests/wpt/web-platform-tests/interfaces/pointerlock.idl b/tests/wpt/web-platform-tests/interfaces/pointerlock.idl
index fca676df459..13f7a8be482 100644
--- a/tests/wpt/web-platform-tests/interfaces/pointerlock.idl
+++ b/tests/wpt/web-platform-tests/interfaces/pointerlock.idl
@@ -13,7 +13,7 @@ partial interface Document {
   void exitPointerLock();
 };
 
-partial interface DocumentOrShadowRoot {
+partial interface mixin DocumentOrShadowRoot {
   readonly attribute Element? pointerLockElement;
 };
 
diff --git a/tests/wpt/web-platform-tests/interfaces/web-bluetooth.idl b/tests/wpt/web-platform-tests/interfaces/web-bluetooth.idl
index d372f0260eb..00b93a55133 100644
--- a/tests/wpt/web-platform-tests/interfaces/web-bluetooth.idl
+++ b/tests/wpt/web-platform-tests/interfaces/web-bluetooth.idl
@@ -23,7 +23,7 @@ dictionary RequestDeviceOptions {
   boolean acceptAllDevices = false;
 };
 
-[SecureContext]
+[Exposed=Window, SecureContext]
 interface Bluetooth : EventTarget {
   Promise<boolean> getAvailability();
   attribute EventHandler onavailabilitychanged;
@@ -31,9 +31,9 @@ interface Bluetooth : EventTarget {
   readonly attribute BluetoothDevice? referringDevice;
   Promise<BluetoothDevice> requestDevice(optional RequestDeviceOptions options);
 };
-Bluetooth implements BluetoothDeviceEventHandlers;
-Bluetooth implements CharacteristicEventHandlers;
-Bluetooth implements ServiceEventHandlers;
+Bluetooth includes BluetoothDeviceEventHandlers;
+Bluetooth includes CharacteristicEventHandlers;
+Bluetooth includes ServiceEventHandlers;
 
 dictionary BluetoothPermissionDescriptor : PermissionDescriptor {
   DOMString deviceId;
@@ -53,11 +53,13 @@ dictionary BluetoothPermissionData {
   required sequence<AllowedBluetoothDevice> allowedDevices;
 };
 
+[Exposed=Window]
 interface BluetoothPermissionResult : PermissionStatus {
   attribute FrozenArray<BluetoothDevice> devices;
 };
 
 [
+  Exposed=Window,
   Constructor(DOMString type, optional ValueEventInit initDict),
   SecureContext
 ]
@@ -69,8 +71,8 @@ dictionary ValueEventInit : EventInit {
   any value = null;
 };
 
-[SecureContext]
-interface BluetoothDevice {
+[Exposed=Window, SecureContext]
+interface BluetoothDevice : EventTarget {
   readonly attribute DOMString id;
   readonly attribute DOMString? name;
   readonly attribute BluetoothRemoteGATTServer? gatt;
@@ -79,20 +81,20 @@ interface BluetoothDevice {
   void unwatchAdvertisements();
   readonly attribute boolean watchingAdvertisements;
 };
-BluetoothDevice implements EventTarget;
-BluetoothDevice implements BluetoothDeviceEventHandlers;
-BluetoothDevice implements CharacteristicEventHandlers;
-BluetoothDevice implements ServiceEventHandlers;
+BluetoothDevice includes BluetoothDeviceEventHandlers;
+BluetoothDevice includes CharacteristicEventHandlers;
+BluetoothDevice includes ServiceEventHandlers;
 
-[SecureContext]
+[Exposed=Window, SecureContext]
 interface BluetoothManufacturerDataMap {
   readonly maplike<unsigned short, DataView>;
 };
-[SecureContext]
+[Exposed=Window, SecureContext]
 interface BluetoothServiceDataMap {
   readonly maplike<UUID, DataView>;
 };
 [
+  Exposed=Window,
   Constructor(DOMString type, BluetoothAdvertisingEventInit init),
   SecureContext
 ]
@@ -116,11 +118,11 @@ dictionary BluetoothAdvertisingEventInit : EventInit {
   unsigned short appearance;
   byte txPower;
   byte rssi;
-  Map manufacturerData;
-  Map serviceData;
+  BluetoothManufacturerDataMap manufacturerData;
+  BluetoothServiceDataMap serviceData;
 };
 
-[SecureContext]
+[Exposed=Window, SecureContext]
 interface BluetoothRemoteGATTServer {
   [SameObject]
   readonly attribute BluetoothDevice device;
@@ -132,8 +134,8 @@ interface BluetoothRemoteGATTServer {
     getPrimaryServices(optional BluetoothServiceUUID service);
 };
 
-[SecureContext]
-interface BluetoothRemoteGATTService {
+[Exposed=Window, SecureContext]
+interface BluetoothRemoteGATTService : EventTarget {
   [SameObject]
   readonly attribute BluetoothDevice device;
   readonly attribute UUID uuid;
@@ -147,12 +149,11 @@ interface BluetoothRemoteGATTService {
   Promise<sequence<BluetoothRemoteGATTService>>
     getIncludedServices(optional BluetoothServiceUUID service);
 };
-BluetoothRemoteGATTService implements EventTarget;
-BluetoothRemoteGATTService implements CharacteristicEventHandlers;
-BluetoothRemoteGATTService implements ServiceEventHandlers;
+BluetoothRemoteGATTService includes CharacteristicEventHandlers;
+BluetoothRemoteGATTService includes ServiceEventHandlers;
 
-[SecureContext]
-interface BluetoothRemoteGATTCharacteristic {
+[Exposed=Window, SecureContext]
+interface BluetoothRemoteGATTCharacteristic : EventTarget {
   [SameObject]
   readonly attribute BluetoothRemoteGATTService service;
   readonly attribute UUID uuid;
@@ -166,10 +167,9 @@ interface BluetoothRemoteGATTCharacteristic {
   Promise<BluetoothRemoteGATTCharacteristic> startNotifications();
   Promise<BluetoothRemoteGATTCharacteristic> stopNotifications();
 };
-BluetoothRemoteGATTCharacteristic implements EventTarget;
-BluetoothRemoteGATTCharacteristic implements CharacteristicEventHandlers;
+BluetoothRemoteGATTCharacteristic includes CharacteristicEventHandlers;
 
-[SecureContext]
+[Exposed=Window, SecureContext]
 interface BluetoothCharacteristicProperties {
   readonly attribute boolean broadcast;
   readonly attribute boolean read;
@@ -182,7 +182,7 @@ interface BluetoothCharacteristicProperties {
   readonly attribute boolean writableAuxiliaries;
 };
 
-[SecureContext]
+[Exposed=Window, SecureContext]
 interface BluetoothRemoteGATTDescriptor {
   [SameObject]
   readonly attribute BluetoothRemoteGATTCharacteristic characteristic;
@@ -192,24 +192,25 @@ interface BluetoothRemoteGATTDescriptor {
   Promise<void> writeValue(BufferSource value);
 };
 
-[NoInterfaceObject, SecureContext]
-interface CharacteristicEventHandlers {
+[SecureContext]
+interface mixin CharacteristicEventHandlers {
   attribute EventHandler oncharacteristicvaluechanged;
 };
 
-[NoInterfaceObject, SecureContext]
-interface BluetoothDeviceEventHandlers {
+[SecureContext]
+interface mixin BluetoothDeviceEventHandlers {
   attribute EventHandler ongattserverdisconnected;
 };
 
-[NoInterfaceObject, SecureContext]
-interface ServiceEventHandlers {
+[SecureContext]
+interface mixin ServiceEventHandlers {
   attribute EventHandler onserviceadded;
   attribute EventHandler onservicechanged;
   attribute EventHandler onserviceremoved;
 };
 
 typedef DOMString UUID;
+[Exposed=Window]
 interface BluetoothUUID {
   static UUID getService((DOMString or unsigned long) name);
   static UUID getCharacteristic((DOMString or unsigned long) name);
diff --git a/tests/wpt/web-platform-tests/lint.whitelist b/tests/wpt/web-platform-tests/lint.whitelist
index c9221883c51..2f94041e665 100644
--- a/tests/wpt/web-platform-tests/lint.whitelist
+++ b/tests/wpt/web-platform-tests/lint.whitelist
@@ -294,6 +294,7 @@ GENERATE_TESTS: shadow-dom/untriaged/shadow-trees/upper-boundary-encapsulation/w
 SET TIMEOUT: css/css-fonts/font-display/font-display.html
 SET TIMEOUT: css/css-fonts/font-display/font-display-change.html
 SET TIMEOUT: css/css-fonts/font-display/font-display-change-ref.html
+SET TIMEOUT: css/css-fonts/font-display/font-display-feature-policy.tentative.html
 SET TIMEOUT: css/css-fonts/font-display/font-display-preload.html
 SET TIMEOUT: html/browsers/windows/auxiliary-browsing-contexts/resources/close-opener.html
 SET TIMEOUT: html/dom/documents/dom-tree-accessors/Document.currentScript.html
diff --git a/tests/wpt/web-platform-tests/pointerevents/pointerevent_boundary_events_at_implicit_release_hoverable_pointers-manual.html b/tests/wpt/web-platform-tests/pointerevents/pointerevent_boundary_events_at_implicit_release_hoverable_pointers.html
similarity index 89%
rename from tests/wpt/web-platform-tests/pointerevents/pointerevent_boundary_events_at_implicit_release_hoverable_pointers-manual.html
rename to tests/wpt/web-platform-tests/pointerevents/pointerevent_boundary_events_at_implicit_release_hoverable_pointers.html
index 62a0a6d5a4a..e860cd082be 100644
--- a/tests/wpt/web-platform-tests/pointerevents/pointerevent_boundary_events_at_implicit_release_hoverable_pointers-manual.html
+++ b/tests/wpt/web-platform-tests/pointerevents/pointerevent_boundary_events_at_implicit_release_hoverable_pointers.html
@@ -8,6 +8,9 @@
     <link rel="stylesheet" type="text/css" href="pointerevent_styles.css">
     <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>
     <script type="text/javascript" src="pointerevent_support.js"></script>
     <script type="text/javascript">
       var detected_pointertypes = {};
@@ -42,7 +45,7 @@
             detected_pointertypes[event.pointerType] = true;
             event_log.push(event.type + '@' + event.target.id);
             if (event.type == 'lostpointercapture') {
-              setTimeout(function() {
+              step_timeout(function() {
                 test_pointer_event.step(function () {
                   var expected_events = "pointerup, lostpointercapture, pointerout, pointerleave";
                   assert_equals(event_log.join(", "), "pointerout@target, pointerleave@target, pointerover@capture-target, pointerenter@capture-target, gotpointercapture@capture-target, pointerup@capture-target, lostpointercapture@capture-target, pointerout@capture-target, pointerleave@capture-target, pointerover@target, pointerenter@target");
@@ -52,6 +55,13 @@
             }
           });
         });
+
+        // Inject mouse inputs.
+        new test_driver.Actions()
+          .pointerMove(0, 0, {origin: target})
+          .pointerDown()
+          .pointerUp()
+          .send();
       }
     </script>
     <style>
diff --git a/tests/wpt/web-platform-tests/pointerevents/pointerevent_lostpointercapture_for_disconnected_node-manual.html b/tests/wpt/web-platform-tests/pointerevents/pointerevent_lostpointercapture_for_disconnected_node.html
similarity index 81%
rename from tests/wpt/web-platform-tests/pointerevents/pointerevent_lostpointercapture_for_disconnected_node-manual.html
rename to tests/wpt/web-platform-tests/pointerevents/pointerevent_lostpointercapture_for_disconnected_node.html
index f4fe2b424e6..b77d9e31e2c 100644
--- a/tests/wpt/web-platform-tests/pointerevents/pointerevent_lostpointercapture_for_disconnected_node-manual.html
+++ b/tests/wpt/web-platform-tests/pointerevents/pointerevent_lostpointercapture_for_disconnected_node.html
@@ -6,6 +6,9 @@
         <link rel="stylesheet" type="text/css" href="pointerevent_styles.css">
         <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>
         <script src="pointerevent_support.js"></script>
     </head>
     <body>
@@ -42,6 +45,8 @@
             var test_lostpointercapture = async_test("lostpointercapture event received");
 
             window.onload = function() {
+                var actions_promise;
+
                 on_event(captureButton, 'pointerdown', function(event) {
                     detected_pointertypes[event.pointerType] = true;
                     target0.setPointerCapture(event.pointerId);
@@ -67,8 +72,21 @@
                         // TA: 11.3
                         assert_true(isDisconnected, "lostpointercapture must be fired on the document");
                     }, "lostpointercapture is dispatched on the document");
-                    test_lostpointercapture.done();
+
+                    actions_promise.then( () => {
+                      test_lostpointercapture.done();
+                    });
                 });
+
+                // Inject mouse inputs.
+                actions_promise = new test_driver.Actions()
+                    .pointerMove(0, 0, {origin: captureButton})
+                    .pointerDown()
+                    .pointerMove(2, 0, {origin: captureButton})
+                    .pointerMove(5, 0, {origin: captureButton})
+                    .pointerMove(8, 0, {origin: captureButton})
+                    .pointerMove(10, 0, {origin: captureButton})
+                    .send();
             }
         </script>
         <h1>Pointer Events Capture Test</h1>
diff --git a/tests/wpt/web-platform-tests/pointerevents/pointerevent_lostpointercapture_is_first-manual.html b/tests/wpt/web-platform-tests/pointerevents/pointerevent_lostpointercapture_is_first.html
similarity index 93%
rename from tests/wpt/web-platform-tests/pointerevents/pointerevent_lostpointercapture_is_first-manual.html
rename to tests/wpt/web-platform-tests/pointerevents/pointerevent_lostpointercapture_is_first.html
index 9e460b872e2..6ce0f3e59a0 100644
--- a/tests/wpt/web-platform-tests/pointerevents/pointerevent_lostpointercapture_is_first-manual.html
+++ b/tests/wpt/web-platform-tests/pointerevents/pointerevent_lostpointercapture_is_first.html
@@ -7,6 +7,9 @@
         <link rel="stylesheet" type="text/css" href="pointerevent_styles.css">
         <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>
         <script src="pointerevent_support.js"></script>
     </head>
     <body onload="run()">
@@ -123,6 +126,15 @@
                         }
                     });
                 }
+
+                // Inject mouse inputs.
+                new test_driver.Actions()
+                    .pointerMove(0, 0, {origin: captureButton})
+                    .pointerDown()
+                    .pointerMove(2, 0, {origin: captureButton})
+                    .pointerMove(5, 0, {origin: captureButton})
+                    .pointerUp()
+                    .send();
             }
         </script>
         <h1>Pointer Events Capture Test</h1>
diff --git a/tests/wpt/web-platform-tests/pointerevents/pointerevent_pointerenter_does_not_bubble-manual.html b/tests/wpt/web-platform-tests/pointerevents/pointerevent_pointerenter_does_not_bubble.html
similarity index 88%
rename from tests/wpt/web-platform-tests/pointerevents/pointerevent_pointerenter_does_not_bubble-manual.html
rename to tests/wpt/web-platform-tests/pointerevents/pointerevent_pointerenter_does_not_bubble.html
index 3f0583364a2..7d38de74469 100644
--- a/tests/wpt/web-platform-tests/pointerevents/pointerevent_pointerenter_does_not_bubble-manual.html
+++ b/tests/wpt/web-platform-tests/pointerevents/pointerevent_pointerenter_does_not_bubble.html
@@ -9,6 +9,9 @@
         <!-- /resources/testharness.js -->
         <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>
         <!-- Additional helper script for common checks across event types -->
         <script type="text/javascript" src="pointerevent_support.js"></script>
         <script type="text/javascript">
@@ -48,6 +51,14 @@
                         assert_equals(event.target.id, "parent0", "Recieved " + event.type + " in parent for " + event.target.id);
                     });
                 });
+
+                // Inject mouse inputs.
+                new test_driver.Actions()
+                    .pointerMove(0, 0, {origin: target0})
+                    .pointerMove(-10, -10, {origin: target0})
+                    .pointerMove(-20, -20, {origin: target0})
+                    .pointerMove(0, 0)
+                    .send();
             }
 
         </script>
diff --git a/tests/wpt/web-platform-tests/pointerevents/pointerevent_pointerleave_descendant_over-manual.html b/tests/wpt/web-platform-tests/pointerevents/pointerevent_pointerleave_descendant_over.html
similarity index 84%
rename from tests/wpt/web-platform-tests/pointerevents/pointerevent_pointerleave_descendant_over-manual.html
rename to tests/wpt/web-platform-tests/pointerevents/pointerevent_pointerleave_descendant_over.html
index 8f4f4bfc7a1..ccc5f37477c 100644
--- a/tests/wpt/web-platform-tests/pointerevents/pointerevent_pointerleave_descendant_over-manual.html
+++ b/tests/wpt/web-platform-tests/pointerevents/pointerevent_pointerleave_descendant_over.html
@@ -6,6 +6,9 @@
         <link rel="stylesheet" type="text/css" href="pointerevent_styles.css">
         <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>
         <script src="pointerevent_support.js"></script>
     </head>
     <body onload="run()">
@@ -49,6 +52,14 @@
                         eventTested = true;
                     }
                 });
+
+                // Inject mouse inputs.
+                new test_driver.Actions()
+                    .pointerMove(0, 0, {origin: target0})
+                    .pointerMove(0, 0, {origin: target1})
+                    .pointerDown()
+                    .pointerUp()
+                    .send();
             }
         </script>
         <h1>Pointer Events pointerleave tests</h1>
diff --git a/tests/wpt/web-platform-tests/pointerevents/pointerevent_pointerleave_descendants-manual.html b/tests/wpt/web-platform-tests/pointerevents/pointerevent_pointerleave_descendants.html
similarity index 80%
rename from tests/wpt/web-platform-tests/pointerevents/pointerevent_pointerleave_descendants-manual.html
rename to tests/wpt/web-platform-tests/pointerevents/pointerevent_pointerleave_descendants.html
index ac9edcff38a..fe121a8409d 100644
--- a/tests/wpt/web-platform-tests/pointerevents/pointerevent_pointerleave_descendants-manual.html
+++ b/tests/wpt/web-platform-tests/pointerevents/pointerevent_pointerleave_descendants.html
@@ -6,6 +6,9 @@
         <link rel="stylesheet" type="text/css" href="pointerevent_styles.css">
         <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>
         <script src="pointerevent_support.js"></script>
     </head>
     <body onload="run()">
@@ -26,6 +29,7 @@
 
             function run() {
                 var target0 = document.getElementById("target0");
+                var target1 = document.querySelector("#target0 > div");
                 var test_pointerleave = async_test("pointerleave event received");
 
                 on_event(target0, "pointerover", function(event) {
@@ -40,6 +44,13 @@
                         eventTested = true;
                     }
                 });
+
+                // Inject mouse inputs.
+                new test_driver.Actions()
+                    .pointerMove(0, 0, {origin: target0})
+                    .pointerMove(0, 0, {origin: target1})
+                    .pointerMove(0, 0)
+                    .send();
             }
         </script>
         <h1>Pointer Events pointerleave tests</h1>
diff --git a/tests/wpt/web-platform-tests/pointerevents/pointerevent_pointerleave_does_not_bubble-manual.html b/tests/wpt/web-platform-tests/pointerevents/pointerevent_pointerleave_does_not_bubble.html
similarity index 90%
rename from tests/wpt/web-platform-tests/pointerevents/pointerevent_pointerleave_does_not_bubble-manual.html
rename to tests/wpt/web-platform-tests/pointerevents/pointerevent_pointerleave_does_not_bubble.html
index c0e551cd658..b19820ebd3d 100644
--- a/tests/wpt/web-platform-tests/pointerevents/pointerevent_pointerleave_does_not_bubble-manual.html
+++ b/tests/wpt/web-platform-tests/pointerevents/pointerevent_pointerleave_does_not_bubble.html
@@ -9,6 +9,9 @@
         <!-- /resources/testharness.js -->
         <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>
         <!-- Additional helper script for common checks across event types -->
         <script type="text/javascript" src="pointerevent_support.js"></script>
         <script type="text/javascript">
@@ -38,6 +41,12 @@
                     });
                     test_pointerEvent.done(); // complete test
                 });
+
+                // Inject mouse inputs.
+                new test_driver.Actions()
+                    .pointerMove(0, 0, {origin: target0})
+                    .pointerMove(0, 0)
+                    .send();
             }
         </script>
         <style>
diff --git a/tests/wpt/web-platform-tests/pointerevents/pointerevent_pointerout_received_once-manual.html b/tests/wpt/web-platform-tests/pointerevents/pointerevent_pointerout_received_once.html
similarity index 83%
rename from tests/wpt/web-platform-tests/pointerevents/pointerevent_pointerout_received_once-manual.html
rename to tests/wpt/web-platform-tests/pointerevents/pointerevent_pointerout_received_once.html
index 4827ae91de1..c76e1c57456 100644
--- a/tests/wpt/web-platform-tests/pointerevents/pointerevent_pointerout_received_once-manual.html
+++ b/tests/wpt/web-platform-tests/pointerevents/pointerevent_pointerout_received_once.html
@@ -6,6 +6,9 @@
         <meta name="viewport" content="width=device-width">
         <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>
         <script src="pointerevent_support.js"></script>
     </head>
     <body onload="run()">
@@ -39,13 +42,19 @@
                 on_event(target0, "pointerout", function (event) {
                     pointeroutCounter++;
 
-                    setTimeout(function() {
+                    step_timeout(function() {
                         test(function() {
                             assert_true(pointeroutCounter == 1, "pointerout received just once")
                         }, "pointerout received just once");
                         done();
                     }, 5000);
                 });
+
+                // Inject mouse inputs.
+                new test_driver.Actions()
+                    .pointerMove(0, 0, {origin: target0})
+                    .pointerMove(0, 0)
+                    .send();
             }
         </script>
         <h1>Pointer Events pointerout received once test</h1>
diff --git a/tests/wpt/web-platform-tests/pointerevents/pointerevent_releasepointercapture_invalid_pointerid-manual.html b/tests/wpt/web-platform-tests/pointerevents/pointerevent_releasepointercapture_invalid_pointerid.html
similarity index 88%
rename from tests/wpt/web-platform-tests/pointerevents/pointerevent_releasepointercapture_invalid_pointerid-manual.html
rename to tests/wpt/web-platform-tests/pointerevents/pointerevent_releasepointercapture_invalid_pointerid.html
index d0cf3671743..75351dfb068 100644
--- a/tests/wpt/web-platform-tests/pointerevents/pointerevent_releasepointercapture_invalid_pointerid-manual.html
+++ b/tests/wpt/web-platform-tests/pointerevents/pointerevent_releasepointercapture_invalid_pointerid.html
@@ -11,6 +11,9 @@
         <!-- /resources/testharness.js -->
         <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>
         <!-- Additional helper script for common checks across event types -->
         <script type="text/javascript" src="pointerevent_support.js"></script>
         <script type="text/javascript">
@@ -45,6 +48,14 @@
                     detected_pointertypes[event.pointerType] = true;
                     listener.setPointerCapture(event.pointerId);
                 });
+
+                // Inject mouse inputs.
+                new test_driver.Actions()
+                    .pointerMove(0, 0, {origin: target0})
+                    .pointerDown()
+                    .pointerMove(10, 0, {origin: target0})
+                    .pointerUp()
+                    .send();
             }
         </script>
     </head>
diff --git a/tests/wpt/web-platform-tests/pointerevents/pointerevent_releasepointercapture_onpointerup_mouse-manual.html b/tests/wpt/web-platform-tests/pointerevents/pointerevent_releasepointercapture_onpointerup_mouse.html
similarity index 88%
rename from tests/wpt/web-platform-tests/pointerevents/pointerevent_releasepointercapture_onpointerup_mouse-manual.html
rename to tests/wpt/web-platform-tests/pointerevents/pointerevent_releasepointercapture_onpointerup_mouse.html
index 24fe40d5834..23c28b4bf75 100644
--- a/tests/wpt/web-platform-tests/pointerevents/pointerevent_releasepointercapture_onpointerup_mouse-manual.html
+++ b/tests/wpt/web-platform-tests/pointerevents/pointerevent_releasepointercapture_onpointerup_mouse.html
@@ -6,6 +6,9 @@
         <link rel="stylesheet" type="text/css" href="pointerevent_styles.css">
         <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>
         <script src="pointerevent_support.js"></script>
     </head>
     <body>
@@ -72,6 +75,14 @@
                     event_log.push('pointerup@target0');
                     pointerupGot = true;
                 });
+
+                // Inject mouse inputs.
+                new test_driver.Actions()
+                    .pointerMove(0, 0, {origin: captureButton})
+                    .pointerDown()
+                    .pointerMove(10, 0, {origin: target0})
+                    .pointerUp()
+                    .send();
             }
         </script>
         <h1>Pointer Events Capture Test</h1>
diff --git a/tests/wpt/web-platform-tests/pointerevents/pointerevent_setpointercapture_disconnected-manual.html b/tests/wpt/web-platform-tests/pointerevents/pointerevent_setpointercapture_disconnected.html
similarity index 85%
rename from tests/wpt/web-platform-tests/pointerevents/pointerevent_setpointercapture_disconnected-manual.html
rename to tests/wpt/web-platform-tests/pointerevents/pointerevent_setpointercapture_disconnected.html
index 9e9646525fa..a7cc3e00e23 100644
--- a/tests/wpt/web-platform-tests/pointerevents/pointerevent_setpointercapture_disconnected-manual.html
+++ b/tests/wpt/web-platform-tests/pointerevents/pointerevent_setpointercapture_disconnected.html
@@ -6,6 +6,9 @@
         <link rel="stylesheet" type="text/css" href="pointerevent_styles.css">
         <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>
         <script src="pointerevent_support.js"></script>
         <script type="text/javascript">
             var detected_pointertypes = {};
@@ -34,6 +37,13 @@
                     }
                     test_setPointerCapture.done();
                 });
+
+                // Inject mouse inputs.
+                new test_driver.Actions()
+                    .pointerMove(0, 0, {origin: target0})
+                    .pointerDown()
+                    .pointerUp()
+                    .send();
             }
         </script>
     </head>
diff --git a/tests/wpt/web-platform-tests/pointerevents/pointerevent_setpointercapture_invalid_pointerid-manual.html b/tests/wpt/web-platform-tests/pointerevents/pointerevent_setpointercapture_invalid_pointerid.html
similarity index 88%
rename from tests/wpt/web-platform-tests/pointerevents/pointerevent_setpointercapture_invalid_pointerid-manual.html
rename to tests/wpt/web-platform-tests/pointerevents/pointerevent_setpointercapture_invalid_pointerid.html
index e2b143fe4a5..3180ca53f55 100644
--- a/tests/wpt/web-platform-tests/pointerevents/pointerevent_setpointercapture_invalid_pointerid-manual.html
+++ b/tests/wpt/web-platform-tests/pointerevents/pointerevent_setpointercapture_invalid_pointerid.html
@@ -10,6 +10,9 @@
         <!-- /resources/testharness.js -->
         <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>
         <!-- Additional helper script for common checks across event types -->
         <script type="text/javascript" src="pointerevent_support.js"></script>
         <script type="text/javascript">
@@ -35,6 +38,13 @@
                     });
                     test_pointerEvent.done(); // complete test
                 });
+
+                // Inject mouse inputs.
+                new test_driver.Actions()
+                    .pointerMove(0, 0, {origin: target0})
+                    .pointerDown()
+                    .pointerUp()
+                    .send();
             }
         </script>
     </head>
diff --git a/tests/wpt/web-platform-tests/pointerevents/pointerevent_setpointercapture_relatedtarget-manual.html b/tests/wpt/web-platform-tests/pointerevents/pointerevent_setpointercapture_relatedtarget.html
similarity index 84%
rename from tests/wpt/web-platform-tests/pointerevents/pointerevent_setpointercapture_relatedtarget-manual.html
rename to tests/wpt/web-platform-tests/pointerevents/pointerevent_setpointercapture_relatedtarget.html
index bc1bb93c716..79e55a1bd14 100644
--- a/tests/wpt/web-platform-tests/pointerevents/pointerevent_setpointercapture_relatedtarget-manual.html
+++ b/tests/wpt/web-platform-tests/pointerevents/pointerevent_setpointercapture_relatedtarget.html
@@ -6,6 +6,9 @@
         <link rel="stylesheet" type="text/css" href="pointerevent_styles.css">
         <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>
         <script src="pointerevent_support.js"></script>
     </head>
     <body>
@@ -70,6 +73,8 @@
             }
 
             function run() {
+                var actions_promise;
+
                 // After invoking the setPointerCapture method on an element, subsequent pointer events for the specified pointer must be targeted at that element
                 // and boundary events should be sent accordingly and relatedTarget should behave normally.
                 on_event(target0, "pointerover", function (event) {
@@ -78,7 +83,10 @@
                         test(function() {
                             assert_not_equals(event.relatedTarget, null, "relatedTarget should not be null even when the capture is set")
                         }, "relatedTarget should not be null even when the capture is set.");
-                        done();
+
+                        actions_promise.then( () => {
+                            done();
+                        });
                     }
                 });
 
@@ -92,6 +100,16 @@
                         event_log.push('pointerover@target1');
                     }
                 });
+
+                // Inject mouse inputs.
+                actions_promise = new test_driver.Actions()
+                                      .pointerMove(0, 0, {origin: target1})
+                                      .pointerMove(0, 0, {origin: captureButton})
+                                      .pointerDown()
+                                      .pointerMove(0, 0, {origin: target1})
+                                      .pointerMove(0, 0, {origin: target0})
+                                      .pointerUp()
+                                      .send();
             }
         </script>
         <h1>Pointer Events Capture Test</h1>
diff --git a/tests/wpt/web-platform-tests/pointerevents/pointerevent_suppress_compat_events_on_click-manual.html b/tests/wpt/web-platform-tests/pointerevents/pointerevent_suppress_compat_events_on_click.html
similarity index 81%
rename from tests/wpt/web-platform-tests/pointerevents/pointerevent_suppress_compat_events_on_click-manual.html
rename to tests/wpt/web-platform-tests/pointerevents/pointerevent_suppress_compat_events_on_click.html
index 71b8a08289a..77b5daaed41 100644
--- a/tests/wpt/web-platform-tests/pointerevents/pointerevent_suppress_compat_events_on_click-manual.html
+++ b/tests/wpt/web-platform-tests/pointerevents/pointerevent_suppress_compat_events_on_click.html
@@ -8,6 +8,9 @@
     <link rel="stylesheet" type="text/css" href="pointerevent_styles.css">
     <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>
     <script type="text/javascript" src="pointerevent_support.js"></script>
     <script type="text/javascript">
       var test_pointerEvent = async_test("Suppress compat mouse events on click");
@@ -60,6 +63,22 @@
                   });
               });
           });
+
+          // Inject mouse inputs.
+          var target0 = document.getElementById('target0');
+          var target1 = document.getElementById('target1');
+          var targetDone = document.getElementById('done');
+          new test_driver.Actions()
+              .pointerMove(0, 0, {origin: target0})
+              .pointerDown()
+              .pointerUp()
+              .pointerMove(0, 0, {origin: target1})
+              .pointerDown()
+              .pointerUp()
+              .pointerMove(0, 0, {origin: targetDone})
+              .pointerDown()
+              .pointerUp()
+              .send();
       }
     </script>
     <style>
diff --git a/tests/wpt/web-platform-tests/pointerevents/pointerevent_suppress_compat_events_on_drag_mouse-manual.html b/tests/wpt/web-platform-tests/pointerevents/pointerevent_suppress_compat_events_on_drag_mouse.html
similarity index 83%
rename from tests/wpt/web-platform-tests/pointerevents/pointerevent_suppress_compat_events_on_drag_mouse-manual.html
rename to tests/wpt/web-platform-tests/pointerevents/pointerevent_suppress_compat_events_on_drag_mouse.html
index 8afa04634bb..5bab6e66121 100644
--- a/tests/wpt/web-platform-tests/pointerevents/pointerevent_suppress_compat_events_on_drag_mouse-manual.html
+++ b/tests/wpt/web-platform-tests/pointerevents/pointerevent_suppress_compat_events_on_drag_mouse.html
@@ -8,6 +8,9 @@
     <link rel="stylesheet" type="text/css" href="pointerevent_styles.css">
     <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>
     <script type="text/javascript" src="pointerevent_support.js"></script>
     <script type="text/javascript">
       var test_pointerEvent = async_test("Suppress compat mouse events on drag");
@@ -82,6 +85,24 @@
                   });
               });
           });
+
+          // Inject mouse inputs.
+          var target0 = document.getElementById('target0');
+          var target1 = document.getElementById('target1');
+          var targetDone = document.getElementById('done');
+          new test_driver.Actions()
+              .pointerMove(0, 0, {origin: target0})
+              .pointerDown()
+              .pointerMove(10, 0, {origin: target0})
+              .pointerUp()
+              .pointerMove(0, 0, {origin: target1})
+              .pointerDown()
+              .pointerMove(10, 0, {origin: target1})
+              .pointerUp()
+              .pointerMove(0, 0, {origin: targetDone})
+              .pointerDown()
+              .pointerUp()
+              .send();
       }
     </script>
     <style>
diff --git a/tests/wpt/web-platform-tests/signed-exchange/resources/generate-test-sxgs.sh b/tests/wpt/web-platform-tests/signed-exchange/resources/generate-test-sxgs.sh
index c208e73a558..b351a4296de 100755
--- a/tests/wpt/web-platform-tests/signed-exchange/resources/generate-test-sxgs.sh
+++ b/tests/wpt/web-platform-tests/signed-exchange/resources/generate-test-sxgs.sh
@@ -1,5 +1,5 @@
 #!/bin/sh
-
+sxg_version=1b3
 certfile=127.0.0.1.sxg.pem
 keyfile=127.0.0.1.sxg.key
 inner_url_origin=https://127.0.0.1:8444
@@ -25,7 +25,7 @@ gen-certurl -pem $certfile -ocsp $tmpdir/ocsp > $certfile.cbor
 
 # A valid Signed Exchange.
 gen-signedexchange \
-  -version 1b2 \
+  -version $sxg_version \
   -uri $inner_url_origin/signed-exchange/resources/inner-url.html \
   -status 200 \
   -content sxg-location.html \
@@ -40,7 +40,7 @@ gen-signedexchange \
 
 # For check-cert-request.tentative.html
 gen-signedexchange \
-  -version 1b2 \
+  -version $sxg_version \
   -uri $inner_url_origin/signed-exchange/resources/inner-url.html \
   -status 200 \
   -content sxg-location.html \
@@ -53,25 +53,9 @@ gen-signedexchange \
   -o sxg/check-cert-request.sxg \
   -miRecordSize 100
 
-# Request method is HEAD.
-gen-signedexchange \
-  -version 1b2 \
-  -method HEAD \
-  -uri $inner_url_origin/signed-exchange/resources/inner-url.html \
-  -status 200 \
-  -content sxg-location.html \
-  -certificate $certfile \
-  -certUrl $cert_url_origin/signed-exchange/resources/$certfile.cbor \
-  -validityUrl $inner_url_origin/signed-exchange/resources/resource.validity.msg \
-  -privateKey $keyfile \
-  -date 2018-04-01T00:00:00Z \
-  -expire 168h \
-  -o sxg/sxg-head-request.sxg \
-  -miRecordSize 100
-
 # validityUrl is different origin from request URL.
 gen-signedexchange \
-  -version 1b2 \
+  -version $sxg_version \
   -uri $inner_url_origin/signed-exchange/resources/inner-url.html \
   -status 200 \
   -content failure.html \
@@ -86,7 +70,7 @@ gen-signedexchange \
 
 # certUrl is 404 and fallback URL is another signed exchange.
 gen-signedexchange \
-  -version 1b2 \
+  -version $sxg_version \
   -uri $inner_url_origin/signed-exchange/resources/sxg/sxg-location.sxg \
   -status 200 \
   -content failure.html \
@@ -101,7 +85,7 @@ gen-signedexchange \
 
 # Nested signed exchange.
 gen-signedexchange \
-  -version 1b2 \
+  -version $sxg_version \
   -uri "$inner_url_origin/signed-exchange/resources/inner-url.html?fallback-from-nested-sxg" \
   -status 200 \
   -content sxg/sxg-location.sxg \
@@ -117,7 +101,7 @@ gen-signedexchange \
 
 # Fallback URL has non-ASCII UTF-8 characters.
 gen-signedexchange \
-  -version 1b2 \
+  -version $sxg_version \
   -ignoreErrors \
   -uri "$inner_url_origin/signed-exchange/resources/🌐📦.html" \
   -status 200 \
@@ -133,7 +117,7 @@ gen-signedexchange \
 
 # Fallback URL has invalid UTF-8 sequence.
 gen-signedexchange \
-  -version 1b2 \
+  -version $sxg_version \
   -ignoreErrors \
   -uri "$inner_url_origin/signed-exchange/resources/$(echo -e '\xce\xce\xa9').html" \
   -status 200 \
@@ -149,7 +133,7 @@ gen-signedexchange \
 
 # Fallback URL has UTF-8 BOM.
 gen-signedexchange \
-  -version 1b2 \
+  -version $sxg_version \
   -ignoreErrors \
   -uri "$(echo -e '\xef\xbb\xbf')$inner_url_origin/signed-exchange/resources/inner-url.html" \
   -status 200 \
@@ -165,7 +149,7 @@ gen-signedexchange \
 
 # Response has Cache-Control: no-store header.
 gen-signedexchange \
-  -version 1b2 \
+  -version $sxg_version \
   -uri $inner_url_origin/signed-exchange/resources/inner-url.html \
   -status 200 \
   -responseHeader "Cache-Control: no-store" \
@@ -179,4 +163,21 @@ gen-signedexchange \
   -o sxg/sxg-noncacheable.sxg \
   -miRecordSize 100
 
+# Response has a strict-transport-security header.
+gen-signedexchange \
+  -version $sxg_version \
+  -uri $inner_url_origin/signed-exchange/resources/inner-url.html \
+  -status 200 \
+  -responseHeader "Strict-Transport-Security: max-age=31536000" \
+  -content sxg-location.html \
+  -certificate $certfile \
+  -certUrl $cert_url_origin/signed-exchange/resources/$certfile.cbor \
+  -validityUrl $inner_url_origin/signed-exchange/resources/resource.validity.msg \
+  -privateKey $keyfile \
+  -date 2018-04-01T00:00:00Z \
+  -expire 168h \
+  -o sxg/sxg-hsts.sxg \
+  -miRecordSize 100 \
+  -ignoreErrors true
+
 rm -fr $tmpdir
diff --git a/tests/wpt/web-platform-tests/signed-exchange/resources/sxg/__dir__.headers b/tests/wpt/web-platform-tests/signed-exchange/resources/sxg/__dir__.headers
index ca41178420c..83a3c128cfe 100644
--- a/tests/wpt/web-platform-tests/signed-exchange/resources/sxg/__dir__.headers
+++ b/tests/wpt/web-platform-tests/signed-exchange/resources/sxg/__dir__.headers
@@ -1,2 +1,2 @@
-Content-Type: application/signed-exchange;v=b2
+Content-Type: application/signed-exchange;v=b3
 X-Content-Type-Options: nosniff
diff --git a/tests/wpt/web-platform-tests/signed-exchange/resources/sxg/check-cert-request.sxg b/tests/wpt/web-platform-tests/signed-exchange/resources/sxg/check-cert-request.sxg
index 05f1646cfeb..d412f463822 100644
Binary files a/tests/wpt/web-platform-tests/signed-exchange/resources/sxg/check-cert-request.sxg and b/tests/wpt/web-platform-tests/signed-exchange/resources/sxg/check-cert-request.sxg differ
diff --git a/tests/wpt/web-platform-tests/signed-exchange/resources/sxg/fallback-to-another-sxg.sxg b/tests/wpt/web-platform-tests/signed-exchange/resources/sxg/fallback-to-another-sxg.sxg
index 1af86c04134..784b44abde9 100644
Binary files a/tests/wpt/web-platform-tests/signed-exchange/resources/sxg/fallback-to-another-sxg.sxg and b/tests/wpt/web-platform-tests/signed-exchange/resources/sxg/fallback-to-another-sxg.sxg differ
diff --git a/tests/wpt/web-platform-tests/signed-exchange/resources/sxg/nested-sxg.sxg b/tests/wpt/web-platform-tests/signed-exchange/resources/sxg/nested-sxg.sxg
index 2970e2df82c..c4eaf771c21 100644
Binary files a/tests/wpt/web-platform-tests/signed-exchange/resources/sxg/nested-sxg.sxg and b/tests/wpt/web-platform-tests/signed-exchange/resources/sxg/nested-sxg.sxg differ
diff --git a/tests/wpt/web-platform-tests/signed-exchange/resources/sxg/sxg-head-request.sxg b/tests/wpt/web-platform-tests/signed-exchange/resources/sxg/sxg-hsts.sxg
similarity index 53%
rename from tests/wpt/web-platform-tests/signed-exchange/resources/sxg/sxg-head-request.sxg
rename to tests/wpt/web-platform-tests/signed-exchange/resources/sxg/sxg-hsts.sxg
index 9d09647481c..68650b8c368 100644
Binary files a/tests/wpt/web-platform-tests/signed-exchange/resources/sxg/sxg-head-request.sxg and b/tests/wpt/web-platform-tests/signed-exchange/resources/sxg/sxg-hsts.sxg differ
diff --git a/tests/wpt/web-platform-tests/signed-exchange/resources/sxg/sxg-inner-url-bom.sxg b/tests/wpt/web-platform-tests/signed-exchange/resources/sxg/sxg-inner-url-bom.sxg
index ace5abdd0b0..88e617d5fbb 100644
Binary files a/tests/wpt/web-platform-tests/signed-exchange/resources/sxg/sxg-inner-url-bom.sxg and b/tests/wpt/web-platform-tests/signed-exchange/resources/sxg/sxg-inner-url-bom.sxg differ
diff --git a/tests/wpt/web-platform-tests/signed-exchange/resources/sxg/sxg-invalid-utf8-inner-url.sxg b/tests/wpt/web-platform-tests/signed-exchange/resources/sxg/sxg-invalid-utf8-inner-url.sxg
index 1f697b74b0d..d045d5b8829 100644
Binary files a/tests/wpt/web-platform-tests/signed-exchange/resources/sxg/sxg-invalid-utf8-inner-url.sxg and b/tests/wpt/web-platform-tests/signed-exchange/resources/sxg/sxg-invalid-utf8-inner-url.sxg differ
diff --git a/tests/wpt/web-platform-tests/signed-exchange/resources/sxg/sxg-invalid-validity-url.sxg b/tests/wpt/web-platform-tests/signed-exchange/resources/sxg/sxg-invalid-validity-url.sxg
index 3266e7e7040..628f6ccf283 100644
Binary files a/tests/wpt/web-platform-tests/signed-exchange/resources/sxg/sxg-invalid-validity-url.sxg and b/tests/wpt/web-platform-tests/signed-exchange/resources/sxg/sxg-invalid-validity-url.sxg differ
diff --git a/tests/wpt/web-platform-tests/signed-exchange/resources/sxg/sxg-location.sxg b/tests/wpt/web-platform-tests/signed-exchange/resources/sxg/sxg-location.sxg
index a81854142a5..3540bfea63c 100644
Binary files a/tests/wpt/web-platform-tests/signed-exchange/resources/sxg/sxg-location.sxg and b/tests/wpt/web-platform-tests/signed-exchange/resources/sxg/sxg-location.sxg differ
diff --git a/tests/wpt/web-platform-tests/signed-exchange/resources/sxg/sxg-noncacheable.sxg b/tests/wpt/web-platform-tests/signed-exchange/resources/sxg/sxg-noncacheable.sxg
index 38be1eeb3aa..38aa45980ca 100644
Binary files a/tests/wpt/web-platform-tests/signed-exchange/resources/sxg/sxg-noncacheable.sxg and b/tests/wpt/web-platform-tests/signed-exchange/resources/sxg/sxg-noncacheable.sxg differ
diff --git a/tests/wpt/web-platform-tests/signed-exchange/resources/sxg/sxg-utf8-inner-url.sxg b/tests/wpt/web-platform-tests/signed-exchange/resources/sxg/sxg-utf8-inner-url.sxg
index c8f8a94ef90..914a8458b0a 100644
Binary files a/tests/wpt/web-platform-tests/signed-exchange/resources/sxg/sxg-utf8-inner-url.sxg and b/tests/wpt/web-platform-tests/signed-exchange/resources/sxg/sxg-utf8-inner-url.sxg differ
diff --git a/tests/wpt/web-platform-tests/signed-exchange/sxg-head-request.tentative.html b/tests/wpt/web-platform-tests/signed-exchange/sxg-head-request.tentative.html
deleted file mode 100644
index ad65a5892d8..00000000000
--- a/tests/wpt/web-platform-tests/signed-exchange/sxg-head-request.tentative.html
+++ /dev/null
@@ -1,17 +0,0 @@
-<!DOCTYPE html>
-<title>Loading SignedHTTPExchange with HEAD request method must fail</title>
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-<script src="/common/get-host-info.sub.js"></script>
-<script src="./resources/sxg-util.js"></script>
-<body>
-<script>
-promise_test(async (t) => {
-  const sxgUrl = get_host_info().HTTPS_ORIGIN + '/signed-exchange/resources/sxg/sxg-head-request.sxg';
-  const message = await openSXGInIframeAndWaitForMessage(t, sxgUrl);
-  assert_equals(message.location, innerURLOrigin() + '/signed-exchange/resources/inner-url.html');
-  assert_true(message.is_fallback);
-}, 'Loading SignedHTTPExchange with HEAD request method must fail');
-
-</script>
-</body>
diff --git a/tests/wpt/web-platform-tests/signed-exchange/sxg-hsts.tentative.html b/tests/wpt/web-platform-tests/signed-exchange/sxg-hsts.tentative.html
new file mode 100644
index 00000000000..6024e2879e7
--- /dev/null
+++ b/tests/wpt/web-platform-tests/signed-exchange/sxg-hsts.tentative.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<title>Loading SignedHTTPExchange with strict-transport-security must fail</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/get-host-info.sub.js"></script>
+<script src="./resources/sxg-util.js"></script>
+<body>
+<script>
+promise_test(async (t) => {
+  const sxgUrl = get_host_info().HTTPS_ORIGIN +
+                 '/signed-exchange/resources/sxg/sxg-hsts.sxg';
+  const message = await openSXGInIframeAndWaitForMessage(t, sxgUrl);
+  const innerURL = innerURLOrigin() +
+                   '/signed-exchange/resources/inner-url.html';
+  assert_equals(message.location, innerURL);
+  assert_true(message.is_fallback);
+}, 'Loading SignedHTTPExchange with an uncached header ' +
+   'Strict-Transport-Security must fail and fallback redirect.');
+
+</script>
+</body>
diff --git a/tests/wpt/web-platform-tests/svg/interact/manual/event-attribute-001-manual.svg b/tests/wpt/web-platform-tests/svg/interact/manual/event-attribute-001-manual.svg
new file mode 100644
index 00000000000..af22470b9ac
--- /dev/null
+++ b/tests/wpt/web-platform-tests/svg/interact/manual/event-attribute-001-manual.svg
@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg"
+     xmlns:h="http://www.w3.org/1999/xhtml"
+     width="100%" height="100%" viewBox="0 0 480 360">
+  <title>Event attributes - onwheel</title>
+  <metadata>
+    <h:link rel="help" href="https://svgwg.org/svg2-draft/interact.html#EventAttributes"/>
+    <h:link rel="help" href="https://svgwg.org/svg2-draft/attindex.html#RegularAttributes"/>
+    <h:meta name="assert" content="onwheel attribute runs script in response to wheel events"/>
+  </metadata>
+  <style>
+    text {
+      font-size: 12px;
+    }
+    #target {
+      fill: yellow;
+    }
+  </style>
+  <script>
+    'use strict';
+    function complete() {
+      document.getElementById('target').style.fill = 'lime';
+    }
+  </script>
+  <text x="30" y="30">Select the box, use the mouse wheel and check that the box become green.</text>
+  <rect id="target" x="140" y="160" width="200" height="200" onwheel="complete()" />
+</svg>
diff --git a/tests/wpt/web-platform-tests/tools/wptrunner/requirements_firefox.txt b/tests/wpt/web-platform-tests/tools/wptrunner/requirements_firefox.txt
index 9e6f6b51ad7..7e851432494 100644
--- a/tests/wpt/web-platform-tests/tools/wptrunner/requirements_firefox.txt
+++ b/tests/wpt/web-platform-tests/tools/wptrunner/requirements_firefox.txt
@@ -4,6 +4,6 @@ mozprocess == 0.26
 mozcrash == 1.0
 mozrunner==7.2.0
 mozleak==0.2
-mozinstall==1.16.0
+mozinstall==2.0.0
 mozdownload==1.25
 mozversion==1.5
diff --git a/tests/wpt/web-platform-tests/web-share/canShare-files.https.html b/tests/wpt/web-platform-tests/web-share/canShare-files.https.html
new file mode 100644
index 00000000000..98863a4e211
--- /dev/null
+++ b/tests/wpt/web-platform-tests/web-share/canShare-files.https.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>WebShare Test: canShare with files</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+  </head>
+  <body>
+    <script>
+      'use strict';
+      const textFile = new File(['hello'], 'hello.txt', {type:'text/plain'});
+      const emptyFile = new File([''], 'empty');
+
+      test(() => {
+        assert_throws(new TypeError(), () => { navigator.canShare({files: textFile}) });
+      }, 'canShare with single file');
+
+      test(() => {
+        assert_equals(navigator.canShare({files: []}), false);
+      }, 'canShare with empty file list');
+
+      test(() => {
+        assert_equals(navigator.canShare({files: [emptyFile]}), true);
+      }, 'canShare with single file list');
+
+      test(() => {
+        assert_equals(navigator.canShare({files: [textFile, emptyFile]}), true);
+      }, 'canShare with file list');
+
+      test(() => {
+        assert_equals(navigator.canShare({files: [textFile, emptyFile, textFile]}), true);
+      }, 'canShare with repeated file');
+
+      test(() => {
+        assert_equals(navigator.canShare({url: 'https://example.com/', files: [textFile, emptyFile]}), true);
+      }, 'canShare with file list and url');
+    </script>
+  </body>
+</html>
diff --git a/tests/wpt/web-platform-tests/web-share/canShare-insecure.http.html b/tests/wpt/web-platform-tests/web-share/canShare-insecure.http.html
new file mode 100644
index 00000000000..ce81c7c0c8a
--- /dev/null
+++ b/tests/wpt/web-platform-tests/web-share/canShare-insecure.http.html
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>WebShare Test: canShare from non-secure context</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+  </head>
+  <body>
+    <script>
+        test(() => {
+          assert_false('canShare' in navigator, 'navigator has attribute \'canShare\'.');
+        }, 'navigator.canShare must be undefined in non-secure context');
+    </script>
+  </body>
+</html>
diff --git a/tests/wpt/web-platform-tests/web-share/canShare.https.html b/tests/wpt/web-platform-tests/web-share/canShare.https.html
new file mode 100644
index 00000000000..bb263e54255
--- /dev/null
+++ b/tests/wpt/web-platform-tests/web-share/canShare.https.html
@@ -0,0 +1,85 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>WebShare Test: canShare without files</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+  </head>
+  <body>
+    <script>
+      'use strict';
+
+      test(() => {
+        assert_equals(navigator.canShare(), false);
+      }, 'canShare with no arguments (same as empty dictionary)');
+
+      test(() => {
+        assert_equals(navigator.canShare({}), false);
+      }, 'canShare with an empty dictionary');
+
+      test(() => {
+        assert_equals(navigator.canShare(undefined), false);
+      }, 'canShare with a undefined argument (same as empty dictionary)');
+
+      test(() => {
+        assert_equals(navigator.canShare(null), false);
+      }, 'canShare with a null argument (same as empty dictionary)');
+
+      test(() => {
+        assert_equals(navigator.canShare({unused: 'unexpected field'}), false);
+      }, 'canShare with a dictionary containing only surplus fields');
+
+      test(() => {
+        // URL is invalid in that the URL Parser returns failure (port is too
+        // large).
+        const url = 'http://example.com:65536';
+        assert_equals(navigator.canShare({url}), false);
+      }, 'canShare with an invalid URL');
+
+      test(() => {
+        assert_equals(navigator.canShare({title: undefined}), false);
+      }, 'canShare with attribute undefined is equivalent to omitting the attribute');
+
+      test(() => {
+        assert_equals(navigator.canShare({title: 'subject'}), true);
+      }, 'canShare with title');
+
+      test(() => {
+        assert_equals(navigator.canShare({text: 'body'}), true);
+      }, 'canShare with text');
+
+      test(() => {
+        assert_equals(navigator.canShare({url: 'https://www.example.com/some/path?some_query#some_fragment'}), true);
+      }, 'canShare with URL');
+
+      test(() => {
+        assert_equals(navigator.canShare({title: null}), true);
+      }, 'canShare with null attribute');
+
+      test(() => {
+        assert_equals(navigator.canShare({text: 123}), true);
+      }, 'canShare with number');
+
+      test(() => {
+        assert_equals(navigator.canShare({url: {toString() { return 'https://example.com/'; }}}), true);
+      }, 'canShare with object');
+
+      test(() => {
+        assert_equals(navigator.canShare({title: 'subject', text: 'body', url: 'https://example.com/', unused: 'unexpected field'}), true);
+      }, 'canShare with unexpected field');
+
+      test(() => {
+        assert_equals(navigator.canShare({url: 'data:the url'}), true);
+      }, 'canShare with data URL');
+
+      test(() => {
+        assert_equals(navigator.canShare({url: ''}), true);
+      }, 'canShare with empty URL');
+
+      test(() => {
+        assert_equals(navigator.canShare({url: '//www.example.com/some/path?some_query#some_fragment'}), true);
+      }, 'canShare with URL having no scheme');
+    </script>
+  </body>
+</html>
diff --git a/tests/wpt/web-platform-tests/webrtc/RTCRtpReceiver-getContributingSources.https.html b/tests/wpt/web-platform-tests/webrtc/RTCRtpReceiver-getContributingSources.https.html
index 8ddff5be410..aa59f1b910a 100644
--- a/tests/wpt/web-platform-tests/webrtc/RTCRtpReceiver-getContributingSources.https.html
+++ b/tests/wpt/web-platform-tests/webrtc/RTCRtpReceiver-getContributingSources.https.html
@@ -5,85 +5,31 @@
 <script src="/resources/testharnessreport.js"></script>
 <script src="RTCPeerConnection-helper.js"></script>
 <script>
-  'use strict';
+'use strict';
 
-  // Test is based on the following editor draft:
-  // https://w3c.github.io/webrtc-pc/archives/20170605/webrtc.html
+async function connectAndExpectNoCsrcs(t, kind) {
+  const pc1 = new RTCPeerConnection();
+  t.add_cleanup(() => pc1.close());
+  const pc2 = new RTCPeerConnection();
+  t.add_cleanup(() => pc2.close());
 
-  // The following helper function is called from RTCPeerConnection-helper.js
-  //   getTrackFromUserMedia
-  //   exchangeIceCandidates
-  //   doSignalingHandshake
+  const stream = await navigator.mediaDevices.getUserMedia({[kind]:true});
+  const [track] = stream.getTracks();
+  t.add_cleanup(() => track.stop());
+  pc1.addTrack(track, stream);
 
-  /*
-    5.3.  RTCRtpReceiver Interface
-      interface RTCRtpReceiver {
-        ...
-        sequence<RTCRtpContributingSource>    getContributingSources();
-      };
+  exchangeIceCandidates(pc1, pc2);
+  const trackEvent = await exchangeOfferAndListenToOntrack(t, pc1, pc2);
+  await exchangeAnswer(pc1, pc2);
 
-      interface RTCRtpContributingSource {
-        readonly attribute DOMHighResTimeStamp timestamp;
-        readonly attribute unsigned long       source;
-        readonly attribute byte?               audioLevel;
-      };
+  assert_array_equals(trackEvent.receiver.getContributingSources(), []);
+}
 
-      audioLevel
-        The audio level contained in the last RTP packet played from this source.
-        audioLevel will be the level value defined in [RFC6465] if the RFC 6465
-        header extension is present, and otherwise null. RFC 6465 defines the
-        level as a integral value from 0 to 127 representing the audio level in
-        negative decibels relative to the loudest signal that the system could
-        possibly encode. Thus, 0 represents the loudest signal the system could
-        possibly encode, and 127 represents silence.
-   */
-
-  promise_test(t => {
-    const pc1 = new RTCPeerConnection();
-    t.add_cleanup(() => pc1.close());
-    const pc2 = new RTCPeerConnection();
-
-    t.add_cleanup(() => pc2.close());
-
-    const ontrackPromise = new Promise(resolve => {
-      pc2.addEventListener('track', trackEvent => {
-        const { receiver } = trackEvent;
-        assert_true(receiver instanceof RTCRtpReceiver,
-          'Expect trackEvent.receiver to be instance of RTCRtpReceiver');
-
-        resolve(receiver);
-      });
-    });
-
-    return getTrackFromUserMedia('audio')
-    .then(([track, mediaStream]) => {
-      pc1.addTrack(track, mediaStream);
-      exchangeIceCandidates(pc1, pc2);
-      return doSignalingHandshake(pc1, pc2);
-    })
-    .then(() => ontrackPromise)
-    .then(receiver => {
-      const contributingSources = receiver.getContributingSources();
-      assert_greater_than(contributingSources.length, 0,
-        'Expect CSRCs to be available after RTP connection is established');
-
-      for(const csrc of contributingSources) {
-        assert_true(csrc instanceof RTCRtpContributingSource,
-          'Expect contributingSources elements to be instance of RTCRtpContributingSource');
-
-        assert_equals(typeof csrc.timestamp, 'number',
-          'Expect csrc.timestamp attribute to be DOMHighResTimeStamp');
-
-        assert_true(Number.isInteger(csrc.source) && csrc.source > 0,
-          'Expect CSRC identifier to be unsigned long');
-
-        if(csrc.audioLevel !== null) {
-          assert_true(Number.isInteger(csrc.audioLevel) &&
-             csrc.audioLevel >= 0 && csrc.audioLevel <= 127,
-            'Expect csrc.audioLevel to be either null or byte value from 0-127.');
-        }
-      }
-    });
-  }, `getContributingSources() should return list of CSRC after connection is established`);
+promise_test(async t => {
+  await connectAndExpectNoCsrcs(t, 'audio');
+}, '[audio] getContributingSources() returns an empty list in loopback call');
 
+promise_test(async t => {
+  await connectAndExpectNoCsrcs(t, 'video');
+}, '[video] getContributingSources() returns an empty list in loopback call');
 </script>