Implement document.scrollingElement (#35994)

<!-- Please describe your changes on the following line: -->
This implements `document.scrollingElement`
(https://drafts.csswg.org/cssom-view/#dom-document-scrollingelement).

---
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- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix #35700
- [x] There are tests for these changes

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is checked, so that we can help you if you get stuck somewhere along the
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---------

Signed-off-by: JimmyDdotEXE <50691404+JimmyDdotEXE@users.noreply.github.com>

components/script/dom/document.rs

@@ -6369,6 +6369,30 @@ impl DocumentMethods<crate::DomTypeHolder> for Document {
         )
     }
 
+    /// <https://drafts.csswg.org/cssom-view/#dom-document-scrollingelement>
+    fn GetScrollingElement(&self, can_gc: CanGc) -> Option<DomRoot<Element>> {
+        // Step 1. If the Document is in quirks mode, follow these steps:
+        if self.quirks_mode() == QuirksMode::Quirks {
+            // Step 1.1. If the body element exists,
+            if let Some(ref body) = self.GetBody() {
+                let e = body.upcast::<Element>();
+                // and it is not potentially scrollable, return the body element and abort these steps.
+                // For this purpose, a value of overflow:clip on the the body element’s parent element
+                // must be treated as overflow:hidden.
+                if !e.is_potentially_scrollable_body_for_scrolling_element(can_gc) {
+                    return Some(DomRoot::from_ref(e));
+                }
+            }
+
+            // Step 1.2. Return null and abort these steps.
+            return None;
+        }
+
+        // Step 2. If there is a root element, return the root element and abort these steps.
+        // Step 3. Return null.
+        self.GetDocumentElement()
+    }
+
     // https://html.spec.whatwg.org/multipage/#dom-document-open
     fn Open(
         &self,

components/script/dom/element.rs

@@ -50,6 +50,7 @@ use style::selector_parser::{
 use style::shared_lock::{Locked, SharedRwLock};
 use style::stylesheets::layer_rule::LayerOrder;
 use style::stylesheets::{CssRuleType, UrlExtraData};
+use style::values::computed::Overflow;
 use style::values::generics::NonNegative;
 use style::values::generics::position::PreferredRatio;
 use style::values::generics::ratio::Ratio;
@@ -455,8 +456,25 @@ impl Element {
             .is_some_and(|s| !s.get_box().clone_display().is_none())
     }
 
-    // https://drafts.csswg.org/cssom-view/#potentially-scrollable
+    /// <https://drafts.csswg.org/cssom-view/#potentially-scrollable>
-    fn is_potentially_scrollable_body(&self, can_gc: CanGc) -> bool {
+    pub(crate) fn is_potentially_scrollable_body(&self, can_gc: CanGc) -> bool {
+        self.is_potentially_scrollable_body_shared_logic(false, can_gc)
+    }
+
+    /// <https://drafts.csswg.org/cssom-view/#potentially-scrollable>
+    pub(crate) fn is_potentially_scrollable_body_for_scrolling_element(
+        &self,
+        can_gc: CanGc,
+    ) -> bool {
+        self.is_potentially_scrollable_body_shared_logic(true, can_gc)
+    }
+
+    /// <https://drafts.csswg.org/cssom-view/#potentially-scrollable>
+    fn is_potentially_scrollable_body_shared_logic(
+        &self,
+        treat_overflow_clip_on_parent_as_hidden: bool,
+        can_gc: CanGc,
+    ) -> bool {
         let node = self.upcast::<Node>();
         debug_assert!(
             node.owner_doc().GetBody().as_deref() == self.downcast::<HTMLElement>(),
@@ -474,9 +492,21 @@ impl Element {
         //     overflow-y properties is neither visible nor clip."
         if let Some(parent) = node.GetParentElement() {
             if let Some(style) = parent.style(can_gc) {
-                if !style.get_box().clone_overflow_x().is_scrollable() &&
+                let mut overflow_x = style.get_box().clone_overflow_x();
-                    !style.get_box().clone_overflow_y().is_scrollable()
+                let mut overflow_y = style.get_box().clone_overflow_y();
-                {
+
+                // This fulfills the 'treat parent element overflow:clip as overflow:hidden' stipulation
+                // from the document.scrollingElement specification.
+                if treat_overflow_clip_on_parent_as_hidden {
+                    if overflow_x == Overflow::Clip {
+                        overflow_x = Overflow::Hidden;
+                    }
+                    if overflow_y == Overflow::Clip {
+                        overflow_y = Overflow::Hidden;
+                    }
+                }
+
+                if !overflow_x.is_scrollable() && !overflow_y.is_scrollable() {
                     return false;
                 }
             };

components/script_bindings/codegen/Bindings.conf

@@ -162,7 +162,7 @@ DOMInterfaces = {
 
 'Document': {
     'additionalTraits': ["crate::interfaces::DocumentHelpers"],
-    'canGc': ['Close', 'CreateElement', 'CreateElementNS', 'ImportNode', 'SetTitle', 'Write', 'Writeln', 'CreateEvent', 'CreateRange', 'Open', 'Open_', 'CreateComment', 'CreateAttribute', 'CreateAttributeNS', 'CreateDocumentFragment', 'CreateTextNode', 'CreateCDATASection', 'CreateProcessingInstruction', 'Prepend', 'Append', 'ReplaceChildren', 'SetBgColor', 'SetFgColor', 'Fonts', 'ElementFromPoint', 'ElementsFromPoint', 'ExitFullscreen', 'CreateExpression', 'CreateNSResolver', 'Evaluate', 'StyleSheets', 'Implementation', 'GetElementsByTagName', 'GetElementsByTagNameNS', 'GetElementsByClassName', 'AdoptNode', 'CreateNodeIterator', 'SetBody', 'GetElementsByName', 'Images', 'Embeds', 'Plugins', 'Links', 'Forms', 'Scripts', 'Anchors', 'Applets', 'Children', 'GetSelection'],
+    'canGc': ['Close', 'CreateElement', 'CreateElementNS', 'ImportNode', 'SetTitle', 'Write', 'Writeln', 'CreateEvent', 'CreateRange', 'Open', 'Open_', 'CreateComment', 'CreateAttribute', 'CreateAttributeNS', 'CreateDocumentFragment', 'CreateTextNode', 'CreateCDATASection', 'CreateProcessingInstruction', 'Prepend', 'Append', 'ReplaceChildren', 'SetBgColor', 'SetFgColor', 'Fonts', 'ElementFromPoint', 'ElementsFromPoint', 'GetScrollingElement', 'ExitFullscreen', 'CreateExpression', 'CreateNSResolver', 'Evaluate', 'StyleSheets', 'Implementation', 'GetElementsByTagName', 'GetElementsByTagNameNS', 'GetElementsByClassName', 'AdoptNode', 'CreateNodeIterator', 'SetBody', 'GetElementsByName', 'Images', 'Embeds', 'Plugins', 'Links', 'Forms', 'Scripts', 'Anchors', 'Applets', 'Children', 'GetSelection'],
 },
 
 'DissimilarOriginWindow': {

components/script_bindings/webidls/Document.webidl

@@ -204,6 +204,16 @@ partial interface Document {
 
 Document includes DocumentOrShadowRoot;
 
+// https://drafts.csswg.org/cssom-view/#extensions-to-the-document-interface
+partial interface Document {
+  // CaretPosition? caretPositionFromPoint(double x, double y, optional CaretPositionFromPointOptions options = {});
+  readonly attribute Element? scrollingElement;
+};
+
+// dictionary CaretPositionFromPointOptions {
+//   sequence<ShadowRoot> shadowRoots = [];
+// };
+
 // https://w3c.github.io/selection-api/#dom-document
 partial interface Document {
   Selection? getSelection();

tests/wpt/meta/MANIFEST.json

@@ -617753,7 +617753,7 @@
       ]
      ],
      "scrollingElement.html": [
-      "408fa47be9a3330aff88ef01e9b8be90fd4008ce",
+      "093c016da557ff867f86b13f5dff9c6d118230ff",
       [
        null,
        {}

tests/wpt/meta/css/css-tables/no-overflow-with-table-cell-margins.html.ini

@@ -1,3 +0,0 @@
-[no-overflow-with-table-cell-margins.html]
-  [no-overflow-with-table-cell-margins]
-    expected: FAIL

tests/wpt/meta/css/cssom-view/HTMLBody-ScrollArea_quirksmode.html.ini

@@ -1,13 +1,4 @@
 [HTMLBody-ScrollArea_quirksmode.html]
-  [document.scrollingElement should be body element in quirks.]
-    expected: FAIL
-
-  [scrollingElement in quirks should be null when body is potentially scrollable.]
-    expected: FAIL
-
-  [scrollingElement in quirks should be body if any of document and body has a visible overflow.]
-    expected: FAIL
-
   [When body potentially scrollable, document.body.scrollHeight changes when changing the height of the body content in quirks.]
     expected: FAIL
 

tests/wpt/meta/css/cssom-view/idlharness.html.ini

@@ -38,9 +38,6 @@
   [Window interface: window must inherit property "screenTop" with the proper type]
     expected: FAIL
 
-  [Document interface: attribute scrollingElement]
-    expected: FAIL
-
   [CSSPseudoElement interface: operation convertRectFromNode(DOMRectReadOnly, GeometryNode, ConvertCoordinateOptions)]
     expected: FAIL
 
@@ -107,9 +104,6 @@
   [Document interface: document must inherit property "convertRectFromNode(DOMRectReadOnly, GeometryNode, ConvertCoordinateOptions)" with the proper type]
     expected: FAIL
 
-  [Document interface: document must inherit property "scrollingElement" with the proper type]
-    expected: FAIL
-
   [CaretPosition interface object name]
     expected: FAIL
 

tests/wpt/meta/css/cssom-view/scroll-behavior-main-frame-root.html.ini

@@ -1,13 +1,4 @@
 [scroll-behavior-main-frame-root.html]
-  [Main frame with auto scroll-behavior ; scroll() with default behavior]
-    expected: FAIL
-
-  [Main frame with auto scroll-behavior ; scroll() with auto behavior]
-    expected: FAIL
-
-  [Main frame with auto scroll-behavior ; scroll() with instant behavior]
-    expected: FAIL
-
   [Main frame with auto scroll-behavior ; scroll() with smooth behavior]
     expected: FAIL
 
@@ -17,21 +8,9 @@
   [Main frame with smooth scroll-behavior ; scroll() with auto behavior]
     expected: FAIL
 
-  [Main frame with smooth scroll-behavior ; scroll() with instant behavior]
-    expected: FAIL
-
   [Main frame with smooth scroll-behavior ; scroll() with smooth behavior]
     expected: FAIL
 
-  [Main frame with auto scroll-behavior ; scrollTo() with default behavior]
-    expected: FAIL
-
-  [Main frame with auto scroll-behavior ; scrollTo() with auto behavior]
-    expected: FAIL
-
-  [Main frame with auto scroll-behavior ; scrollTo() with instant behavior]
-    expected: FAIL
-
   [Main frame with auto scroll-behavior ; scrollTo() with smooth behavior]
     expected: FAIL
 
@@ -41,21 +20,9 @@
   [Main frame with smooth scroll-behavior ; scrollTo() with auto behavior]
     expected: FAIL
 
-  [Main frame with smooth scroll-behavior ; scrollTo() with instant behavior]
-    expected: FAIL
-
   [Main frame with smooth scroll-behavior ; scrollTo() with smooth behavior]
     expected: FAIL
 
-  [Main frame with auto scroll-behavior ; scrollBy() with default behavior]
-    expected: FAIL
-
-  [Main frame with auto scroll-behavior ; scrollBy() with auto behavior]
-    expected: FAIL
-
-  [Main frame with auto scroll-behavior ; scrollBy() with instant behavior]
-    expected: FAIL
-
   [Main frame with auto scroll-behavior ; scrollBy() with smooth behavior]
     expected: FAIL
 
@@ -65,9 +32,6 @@
   [Main frame with smooth scroll-behavior ; scrollBy() with auto behavior]
     expected: FAIL
 
-  [Main frame with smooth scroll-behavior ; scrollBy() with instant behavior]
-    expected: FAIL
-
   [Main frame with smooth scroll-behavior ; scrollBy() with smooth behavior]
     expected: FAIL
 
@@ -95,23 +59,11 @@
   [Main frame with smooth scroll-behavior ; scrollIntoView() with smooth behavior]
     expected: FAIL
 
-  [Set scrollLeft to frame with auto scroll-behavior]
-    expected: FAIL
-
   [Set scrollLeft to frame with smooth scroll-behavior]
     expected: FAIL
 
-  [Set scrollTop to frame with auto scroll-behavior]
-    expected: FAIL
-
   [Set scrollTop to frame with smooth scroll-behavior]
     expected: FAIL
 
-  [Aborting an ongoing smooth scrolling on the main frame with another smooth scrolling]
-    expected: FAIL
-
-  [Aborting an ongoing smooth scrolling on the main frame with an instant scrolling]
-    expected: FAIL
-
   [Make sure the page is ready for animation.]
     expected: FAIL

tests/wpt/meta/css/cssom-view/scroll-behavior-main-frame-window.html.ini

@@ -1,13 +1,4 @@
 [scroll-behavior-main-frame-window.html]
-  [Main frame with auto scroll-behavior ; scroll() with default behavior]
-    expected: FAIL
-
-  [Main frame with auto scroll-behavior ; scroll() with auto behavior]
-    expected: FAIL
-
-  [Main frame with auto scroll-behavior ; scroll() with instant behavior]
-    expected: FAIL
-
   [Main frame with auto scroll-behavior ; scroll() with smooth behavior]
     expected: FAIL
 
@@ -17,21 +8,9 @@
   [Main frame with smooth scroll-behavior ; scroll() with auto behavior]
     expected: FAIL
 
-  [Main frame with smooth scroll-behavior ; scroll() with instant behavior]
-    expected: FAIL
-
   [Main frame with smooth scroll-behavior ; scroll() with smooth behavior]
     expected: FAIL
 
-  [Main frame with auto scroll-behavior ; scrollTo() with default behavior]
-    expected: FAIL
-
-  [Main frame with auto scroll-behavior ; scrollTo() with auto behavior]
-    expected: FAIL
-
-  [Main frame with auto scroll-behavior ; scrollTo() with instant behavior]
-    expected: FAIL
-
   [Main frame with auto scroll-behavior ; scrollTo() with smooth behavior]
     expected: FAIL
 
@@ -41,21 +20,9 @@
   [Main frame with smooth scroll-behavior ; scrollTo() with auto behavior]
     expected: FAIL
 
-  [Main frame with smooth scroll-behavior ; scrollTo() with instant behavior]
-    expected: FAIL
-
   [Main frame with smooth scroll-behavior ; scrollTo() with smooth behavior]
     expected: FAIL
 
-  [Main frame with auto scroll-behavior ; scrollBy() with default behavior]
-    expected: FAIL
-
-  [Main frame with auto scroll-behavior ; scrollBy() with auto behavior]
-    expected: FAIL
-
-  [Main frame with auto scroll-behavior ; scrollBy() with instant behavior]
-    expected: FAIL
-
   [Main frame with auto scroll-behavior ; scrollBy() with smooth behavior]
     expected: FAIL
 
@@ -65,17 +32,8 @@
   [Main frame with smooth scroll-behavior ; scrollBy() with auto behavior]
     expected: FAIL
 
-  [Main frame with smooth scroll-behavior ; scrollBy() with instant behavior]
-    expected: FAIL
-
   [Main frame with smooth scroll-behavior ; scrollBy() with smooth behavior]
     expected: FAIL
 
-  [Aborting an ongoing smooth scrolling on the main frame with another smooth scrolling]
-    expected: FAIL
-
-  [Aborting an ongoing smooth scrolling on the main frame with an instant scrolling]
-    expected: FAIL
-
   [Make sure the page is ready for animation.]
     expected: FAIL

tests/wpt/meta/css/cssom-view/scroll-behavior-subframe-root.html.ini

@@ -1,13 +1,4 @@
 [scroll-behavior-subframe-root.html]
-  [Subframe with auto scroll-behavior ; scroll() with default behavior]
-    expected: FAIL
-
-  [Subframe with auto scroll-behavior ; scroll() with auto behavior]
-    expected: FAIL
-
-  [Subframe with auto scroll-behavior ; scroll() with instant behavior]
-    expected: FAIL
-
   [Subframe with auto scroll-behavior ; scroll() with smooth behavior]
     expected: FAIL
 
@@ -17,21 +8,9 @@
   [Subframe with smooth scroll-behavior ; scroll() with auto behavior]
     expected: FAIL
 
-  [Subframe with smooth scroll-behavior ; scroll() with instant behavior]
-    expected: FAIL
-
   [Subframe with smooth scroll-behavior ; scroll() with smooth behavior]
     expected: FAIL
 
-  [Subframe with auto scroll-behavior ; scrollTo() with default behavior]
-    expected: FAIL
-
-  [Subframe with auto scroll-behavior ; scrollTo() with auto behavior]
-    expected: FAIL
-
-  [Subframe with auto scroll-behavior ; scrollTo() with instant behavior]
-    expected: FAIL
-
   [Subframe with auto scroll-behavior ; scrollTo() with smooth behavior]
     expected: FAIL
 
@@ -41,21 +20,9 @@
   [Subframe with smooth scroll-behavior ; scrollTo() with auto behavior]
     expected: FAIL
 
-  [Subframe with smooth scroll-behavior ; scrollTo() with instant behavior]
-    expected: FAIL
-
   [Subframe with smooth scroll-behavior ; scrollTo() with smooth behavior]
     expected: FAIL
 
-  [Subframe with auto scroll-behavior ; scrollBy() with default behavior]
-    expected: FAIL
-
-  [Subframe with auto scroll-behavior ; scrollBy() with auto behavior]
-    expected: FAIL
-
-  [Subframe with auto scroll-behavior ; scrollBy() with instant behavior]
-    expected: FAIL
-
   [Subframe with auto scroll-behavior ; scrollBy() with smooth behavior]
     expected: FAIL
 
@@ -65,9 +32,6 @@
   [Subframe with smooth scroll-behavior ; scrollBy() with auto behavior]
     expected: FAIL
 
-  [Subframe with smooth scroll-behavior ; scrollBy() with instant behavior]
-    expected: FAIL
-
   [Subframe with smooth scroll-behavior ; scrollBy() with smooth behavior]
     expected: FAIL
 
@@ -95,23 +59,11 @@
   [Subframe with smooth scroll-behavior ; scrollIntoView() with smooth behavior]
     expected: FAIL
 
-  [Subframe setting scrollLeft with auto scroll-behavior]
-    expected: FAIL
-
   [Subframe setting scrollLeft with smooth scroll-behavior]
     expected: FAIL
 
-  [Subframe setting scrollTop with auto scroll-behavior]
-    expected: FAIL
-
   [Subframe setting scrollTop with smooth scroll-behavior]
     expected: FAIL
 
-  [Aborting an ongoing smooth scrolling on a subframe with another smooth scrolling]
-    expected: FAIL
-
-  [Aborting an ongoing smooth scrolling on a subframe with an instant scrolling]
-    expected: FAIL
-
   [Make sure the page is ready for animation.]
     expected: FAIL

tests/wpt/meta/css/cssom-view/scroll-behavior-subframe-window.html.ini

@@ -1,13 +1,4 @@
 [scroll-behavior-subframe-window.html]
-  [Main frame with auto scroll-behavior ; scroll() with default behavior]
-    expected: FAIL
-
-  [Main frame with auto scroll-behavior ; scroll() with auto behavior]
-    expected: FAIL
-
-  [Main frame with auto scroll-behavior ; scroll() with instant behavior]
-    expected: FAIL
-
   [Main frame with auto scroll-behavior ; scroll() with smooth behavior]
     expected: FAIL
 
@@ -17,21 +8,9 @@
   [Main frame with smooth scroll-behavior ; scroll() with auto behavior]
     expected: FAIL
 
-  [Main frame with smooth scroll-behavior ; scroll() with instant behavior]
-    expected: FAIL
-
   [Main frame with smooth scroll-behavior ; scroll() with smooth behavior]
     expected: FAIL
 
-  [Main frame with auto scroll-behavior ; scrollTo() with default behavior]
-    expected: FAIL
-
-  [Main frame with auto scroll-behavior ; scrollTo() with auto behavior]
-    expected: FAIL
-
-  [Main frame with auto scroll-behavior ; scrollTo() with instant behavior]
-    expected: FAIL
-
   [Main frame with auto scroll-behavior ; scrollTo() with smooth behavior]
     expected: FAIL
 
@@ -41,21 +20,9 @@
   [Main frame with smooth scroll-behavior ; scrollTo() with auto behavior]
     expected: FAIL
 
-  [Main frame with smooth scroll-behavior ; scrollTo() with instant behavior]
-    expected: FAIL
-
   [Main frame with smooth scroll-behavior ; scrollTo() with smooth behavior]
     expected: FAIL
 
-  [Main frame with auto scroll-behavior ; scrollBy() with default behavior]
-    expected: FAIL
-
-  [Main frame with auto scroll-behavior ; scrollBy() with auto behavior]
-    expected: FAIL
-
-  [Main frame with auto scroll-behavior ; scrollBy() with instant behavior]
-    expected: FAIL
-
   [Main frame with auto scroll-behavior ; scrollBy() with smooth behavior]
     expected: FAIL
 
@@ -65,17 +32,8 @@
   [Main frame with smooth scroll-behavior ; scrollBy() with auto behavior]
     expected: FAIL
 
-  [Main frame with smooth scroll-behavior ; scrollBy() with instant behavior]
-    expected: FAIL
-
   [Main frame with smooth scroll-behavior ; scrollBy() with smooth behavior]
     expected: FAIL
 
-  [Aborting an ongoing smooth scrolling on the main frame with another smooth scrolling]
-    expected: FAIL
-
-  [Aborting an ongoing smooth scrolling on the main frame with an instant scrolling]
-    expected: FAIL
-
   [Make sure the page is ready for animation.]
     expected: FAIL

tests/wpt/meta/css/cssom-view/scroll-overflow-clip-quirks-001.html.ini

@@ -1,4 +0,0 @@
-[scroll-overflow-clip-quirks-001.html]
-  [CSSOM scrollingElement reflects the propagated scroll to viewport correctly]
-    expected: FAIL
-

tests/wpt/meta/css/cssom-view/scroll-overflow-clip-quirks-002.html.ini

@@ -1,4 +0,0 @@
-[scroll-overflow-clip-quirks-002.html]
-  [CSSOM scrollingElement reflects the propagated scroll to viewport correctly]
-    expected: FAIL
-

tests/wpt/meta/css/cssom-view/scrolling-quirks-vs-nonquirks.html.ini

@@ -1,22 +1,10 @@
 [scrolling-quirks-vs-nonquirks.html]
-  [scrollingElement in non-quirks mode]
-    expected: FAIL
-
-  [scrollLeft/scrollRight of the content in quirks mode]
-    expected: FAIL
-
   [scrollWidth/scrollHeight on the root element in non-quirks mode]
     expected: FAIL
 
-  [scrollingElement in quirks mode]
-    expected: FAIL
-
   [scrollWidth/scrollHeight on the root element in quirks mode]
     expected: FAIL
 
-  [scrollLeft/scrollRight of the content in non-quirks mode]
-    expected: FAIL
-
   [scrollWidth/scrollHeight on the HTML body element in quirks mode]
     expected: FAIL
 

tests/wpt/meta/css/cssom-view/scrollingElement.html.ini

@@ -1,28 +0,0 @@
-[scrollingElement.html]
-  [scrollingElement in quirks mode]
-    expected: FAIL
-
-  [scrollingElement in no-quirks mode]
-    expected: FAIL
-
-  [scrollingElement in quirks mode (body table)]
-    expected: FAIL
-
-  [scrollingElement in no-quirks mode ]
-    expected: FAIL
-
-  [scrollingElement in no-quirks mode  (root table)]
-    expected: FAIL
-
-  [scrollingElement in no-quirks mode  (body table)]
-    expected: FAIL
-
-  [scrollingElement in quirks mode (root table, body table)]
-    expected: FAIL
-
-  [scrollingElement in quirks mode (root table)]
-    expected: FAIL
-
-  [scrollingElement in no-quirks mode  (root table, body table)]
-    expected: FAIL
-

tests/wpt/meta/html/browsers/browsing-the-web/scroll-to-fragid/003.html.ini

@@ -1,3 +0,0 @@
-[003.html]
-  [Fragment Navigation: Updating scroll position]
-    expected: FAIL

tests/wpt/meta/intersection-observer/cross-origin-iframe.sub.html.ini

@@ -1,6 +1,12 @@
 [cross-origin-iframe.sub.html]
-  [Intersection observer test with no explicit root and target in a cross-origin iframe.]
-    expected: FAIL
-
   [First rAF]
     expected: FAIL
+
+  [topDocument.scrollingElement.scrollTop = 200]
+    expected: FAIL
+
+  [iframeDocument.scrollingElement.scrollTop = 250]
+    expected: FAIL
+
+  [topDocument.scrollingElement.scrollTop = 100]
+    expected: FAIL

tests/wpt/meta/intersection-observer/disconnect.html.ini

@@ -1,3 +0,0 @@
-[disconnect.html]
-  [First rAF.]
-    expected: FAIL

tests/wpt/meta/intersection-observer/iframe-no-root-with-wrapping-scroller.html.ini

@@ -1,3 +1,9 @@
 [iframe-no-root-with-wrapping-scroller.html]
   [First rAF.]
     expected: FAIL
+
+  [iframe.contentDocument.scrollingElement.scrollTop = 250]
+    expected: FAIL
+
+  [document.scrollingElement.scrollTop = 100]
+    expected: FAIL

tests/wpt/meta/intersection-observer/iframe-no-root.html.ini

@@ -1,3 +1,9 @@
 [iframe-no-root.html]
   [First rAF.]
     expected: FAIL
+
+  [iframe.contentDocument.scrollingElement.scrollTop = 250]
+    expected: FAIL
+
+  [document.scrollingElement.scrollTop = 100]
+    expected: FAIL

tests/wpt/meta/intersection-observer/multiple-targets.html.ini

@@ -1,3 +1,9 @@
 [multiple-targets.html]
-  [First rAF.]
+  [document.scrollingElement.scrollTop = 150]
+    expected: FAIL
+
+  [document.scrollingElement.scrollTop = 10000]
+    expected: FAIL
+
+  [document.scrollingElement.scrollTop = 0]
     expected: FAIL

tests/wpt/meta/intersection-observer/multiple-thresholds.html.ini

@@ -1,3 +1,21 @@
 [multiple-thresholds.html]
-  [First rAF.]
+  [document.scrollingElement.scrollTop = 120]
+    expected: FAIL
+
+  [document.scrollingElement.scrollTop = 160]
+    expected: FAIL
+
+  [document.scrollingElement.scrollTop = 200]
+    expected: FAIL
+
+  [document.scrollingElement.scrollTop = 240]
+    expected: FAIL
+
+  [document.scrollingElement.scrollTop = window.innerHeight + 140]
+    expected: FAIL
+
+  [document.scrollingElement.scrollTop = window.innerHeight + 160]
+    expected: FAIL
+
+  [document.scrollingElement.scrollTop = window.innerHeight + 200]
     expected: FAIL

tests/wpt/meta/intersection-observer/observer-without-js-reference.html.ini

@@ -1,3 +1,3 @@
 [observer-without-js-reference.html]
-  [First rAF]
+  [document.scrollingElement.scrollTop = 300]
     expected: FAIL

tests/wpt/meta/intersection-observer/root-margin-root-element.html.ini

@@ -1,3 +1,15 @@
 [root-margin-root-element.html]
   [First rAF]
     expected: FAIL
+
+  [root.scrollTop = 50, putting target into root margin]
+    expected: FAIL
+
+  [document.scrollingElement.scrollTop = 0.]
+    expected: FAIL
+
+  [root.scrollTop = 0]
+    expected: FAIL
+
+  [root.scrollTop = 50 with root scrolled out of view.]
+    expected: FAIL

tests/wpt/meta/intersection-observer/root-margin.html.ini

@@ -1,3 +1,9 @@
 [root-margin.html]
-  [First rAF.]
+  [document.scrollingElement.scrollLeft = 100]
+    expected: FAIL
+
+  [document.scrollingElement.scrollTop = document.documentElement.clientHeight + 200]
+    expected: FAIL
+
+  [document.scrollingElement.scrollTop = document.documentElement.clientHeight + 300]
     expected: FAIL

tests/wpt/meta/intersection-observer/same-document-no-root.html.ini

@@ -1,3 +1,6 @@
 [same-document-no-root.html]
-  [First rAF.]
+  [document.scrollingElement.scrollTop = 300]
+    expected: FAIL
+
+  [document.scrollingElement.scrollTop = 100]
     expected: FAIL

tests/wpt/meta/intersection-observer/same-document-root.html.ini

@@ -1,3 +1,15 @@
 [same-document-root.html]
   [First rAF]
     expected: FAIL
+
+  [root.scrollTop = 150 with root scrolled into view.]
+    expected: FAIL
+
+  [document.scrollingElement.scrollTop = 0.]
+    expected: FAIL
+
+  [root.scrollTop = 0]
+    expected: FAIL
+
+  [root.scrollTop = 150 with root scrolled out of view.]
+    expected: FAIL

tests/wpt/meta/intersection-observer/same-document-with-document-root.html.ini

@@ -1,3 +1,3 @@
 [same-document-with-document-root.html]
-  [First rAF.]
+  [document.scrollingElement.scrollTop = 300]
     expected: FAIL

tests/wpt/meta/intersection-observer/same-document-zero-size-target.html.ini

@@ -1,3 +1,6 @@
 [same-document-zero-size-target.html]
-  [First rAF]
+  [document.scrollingElement.scrollTop = 300]
+    expected: FAIL
+
+  [document.scrollingElement.scrollTop = 100]
     expected: FAIL

tests/wpt/meta/intersection-observer/svg-clipped-rect-target.html.ini

@@ -1,3 +1,9 @@
 [svg-clipped-rect-target.html]
   [First rAF.]
     expected: FAIL
+
+  [document.scrollingElement.scrollTop = 300]
+    expected: FAIL
+
+  [document.scrollingElement.scrollTop = 100]
+    expected: FAIL

tests/wpt/meta/intersection-observer/svg-intersection-with-fractional-bounds.html.ini

@@ -1,3 +1,9 @@
 [svg-intersection-with-fractional-bounds.html]
   [Initial Observation]
     expected: FAIL
+
+  [Intersection observation after scrolling 300]
+    expected: FAIL
+
+  [Intersection observation after scrolling 100]
+    expected: FAIL

tests/wpt/meta/intersection-observer/svg-rect-target.html.ini

@@ -1,3 +1,9 @@
 [svg-rect-target.html]
   [First rAF.]
     expected: FAIL
+
+  [document.scrollingElement.scrollTop = 300]
+    expected: FAIL
+
+  [document.scrollingElement.scrollTop = 100]
+    expected: FAIL

tests/wpt/meta/intersection-observer/text-target.html.ini

@@ -1,3 +1,6 @@
 [text-target.html]
-  [First rAF.]
+  [document.scrollingElement.scrollTop = 300]
+    expected: FAIL
+
+  [document.scrollingElement.scrollTop = 100]
     expected: FAIL

tests/wpt/meta/intersection-observer/timestamp.html.ini

@@ -1,3 +1,3 @@
 [timestamp.html]
-  [First rAF after iframe is loaded.]
+  [Generate notifications.]
     expected: FAIL

tests/wpt/meta/intersection-observer/visibility-hidden.html.ini

@@ -1,3 +1,3 @@
 [visibility-hidden.html]
-  [First rAF.]
+  [document.scrollingElement.scrollTop = 300]
     expected: FAIL

tests/wpt/tests/css/cssom-view/scrollingElement.html

@@ -35,6 +35,18 @@ function quirksTest(rootDisplay, bodyDisplay) {
       assert_equals(quirksDoc.scrollingElement, quirksDoc.body,
         "scrollingElement in quirks mode should default to body element.");
 
+      quirksDoc.documentElement.style.overflow = "clip";
+      quirksDoc.body.style.overflow = "auto";
+      assert_equals(quirksDoc.scrollingElement, null);
+      quirksDoc.body.style.overflow = "hidden";
+      assert_equals(quirksDoc.scrollingElement, null);
+      quirksDoc.body.style.overflow = "scroll";
+      assert_equals(quirksDoc.scrollingElement, null);
+      quirksDoc.body.style.overflow = "visible";
+      assert_equals(quirksDoc.scrollingElement, quirksDoc.body);
+      quirksDoc.body.style.overflow = "clip";
+      assert_equals(quirksDoc.scrollingElement, quirksDoc.body);
+
       quirksDoc.documentElement.style.overflow = "scroll";
       quirksDoc.body.style.overflow = "scroll";
       assert_equals(quirksDoc.scrollingElement, null,