Sync WPT with upstream (12-10-2025) (servo#39802)

Automated downstream sync of changes from upstream as of 12-10-2025
[no-wpt-sync]

Signed-off-by: WPT Sync Bot <[email protected]>

Author: servo-wpt-sync

tests/wpt/meta/MANIFEST.json

@@ -0,0 +1,2 @@
+[mix-blend-mode-video.html]
+  expected: FAIL

tests/wpt/meta/css/compositing/mix-blend-mode/mix-blend-mode-video.html.ini

@@ -0,0 +1,12 @@
+[background-shorthand-serialization.html]
+  [background-size with non-initial background-position]
+    expected: FAIL
+
+  [multiple backgrounds with varying values]
+    expected: FAIL
+
+  [border-area border-box]
+    expected: FAIL
+
+  [border-area padding-box]
+    expected: FAIL

tests/wpt/meta/css/css-backgrounds/parsing/background-shorthand-serialization.html.ini

@@ -28,3 +28,33 @@
 
   [e.style['background'\] = "url(\\"https://example.com/\\") 1px 2px / 3px 4px space round local padding-box content-box, rgb(5, 6, 7) url(\\"https://example.com/\\") 1px 2px / 3px 4px space round local padding-box content-box" should not set unrelated longhands]
     expected: FAIL
+
+  [e.style['background'\] = "border-box content-box" should set background-color]
+    expected: FAIL
+
+  [e.style['background'\] = "border-area" should set background-attachment]
+    expected: FAIL
+
+  [e.style['background'\] = "border-area" should set background-clip]
+    expected: FAIL
+
+  [e.style['background'\] = "border-area" should set background-color]
+    expected: FAIL
+
+  [e.style['background'\] = "border-area" should set background-image]
+    expected: FAIL
+
+  [e.style['background'\] = "border-area" should set background-origin]
+    expected: FAIL
+
+  [e.style['background'\] = "border-area" should set background-position]
+    expected: FAIL
+
+  [e.style['background'\] = "border-area" should set background-repeat]
+    expected: FAIL
+
+  [e.style['background'\] = "border-area" should set background-size]
+    expected: FAIL
+
+  [e.style['background'\] = "border-area" should not set unrelated longhands]
+    expected: FAIL

tests/wpt/meta/css/css-backgrounds/parsing/background-valid.html.ini

@@ -0,0 +1,2 @@
+[border-shape-absolute-coords-shape.tentative.html]
+  expected: FAIL

tests/wpt/meta/css/css-borders/border-shape-absolute-coords-shape.tentative.html.ini

@@ -1,3 +1,9 @@
 [border-width-rounding.tentative.html]
   [Test that border widths are rounded up when they are greater than 0px but less than 1px, and rounded down when they are greater than 1px.]
     expected: FAIL
+
+  [border-width: 2.999px]
+    expected: FAIL
+
+  [outline-width: 2.999px]
+    expected: FAIL

tests/wpt/meta/css/css-borders/border-width-rounding.tentative.html.ini

@@ -0,0 +1,42 @@
+[outline-offset-rounding.tentative.html]
+  [0.1px]
+    expected: FAIL
+
+  [-0.1px]
+    expected: FAIL
+
+  [0.25px]
+    expected: FAIL
+
+  [-0.25px]
+    expected: FAIL
+
+  [0.5px]
+    expected: FAIL
+
+  [-0.5px]
+    expected: FAIL
+
+  [0.9px]
+    expected: FAIL
+
+  [-0.9px]
+    expected: FAIL
+
+  [1.25px]
+    expected: FAIL
+
+  [-1.25px]
+    expected: FAIL
+
+  [1.5px]
+    expected: FAIL
+
+  [-1.5px]
+    expected: FAIL
+
+  [2.75px]
+    expected: FAIL
+
+  [-2.75px]
+    expected: FAIL

tests/wpt/meta/css/css-borders/outline-offset-rounding.tentative.html.ini

@@ -16,3 +16,24 @@
 
   [Property border-shape value 'circle() polygon(10px 10px, 100px 10px, 10px 100px)']
     expected: FAIL
+
+  [Property border-shape value 'circle() content-box']
+    expected: FAIL
+
+  [Property border-shape value 'circle() border-box']
+    expected: FAIL
+
+  [Property border-shape value 'circle() border-box polygon(10px 10px, 100px 10px, 10px 100px) border-box']
+    expected: FAIL
+
+  [Property border-shape value 'circle() padding-box polygon(10px 10px, 100px 10px, 10px 100px) border-box']
+    expected: FAIL
+
+  [Property border-shape value 'circle() padding-box polygon(10px 10px, 100px 10px, 10px 100px) padding-box']
+    expected: FAIL
+
+  [Property border-shape value 'circle() polygon(10px 10px, 100px 10px, 10px 100px) border-box']
+    expected: FAIL
+
+  [Property border-shape value 'circle() polygon(10px 10px, 100px 10px, 10px 100px) content-box']
+    expected: FAIL

tests/wpt/meta/css/css-borders/tentative/parsing/border-shape-computed.html.ini

@@ -16,3 +16,6 @@
 
   [e.style['border-shape'\] = "circle() polygon(10px 10px, 100px 10px, 10px 100px)" should set the property value]
     expected: FAIL
+
+  [e.style['border-shape'\] = "circle() border-box circle() content-box" should set the property value]
+    expected: FAIL

tests/wpt/meta/css/css-borders/tentative/parsing/border-shape-valid.html.ini

@@ -82,3 +82,6 @@
 
   [Ancestor element affecting nested scope root (Through latter selector in list)]
     expected: FAIL
+
+  [Parent element of subject affecting scope limit]
+    expected: FAIL