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script/layout: Implement HTMLElement.scrollParent (#39110)

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This new API allows getting the element which establishes an element's
scroll container. This will be used to properly implement
`scrollIntoView`. There is still work to do for this API and
`offsetParent` to properly handle ancestors which are
closed-shadow-hidden from the original query element.

In addition, fix an issue where inline boxes were establishing scrolling
containers (they shouldn't do that).

Testing: There are tests for this change.
Fixes: #39096.

Signed-off-by: Martin Robinson <mrobinson@igalia.com>
Co-authored-by: Oriol Brufau <obrufau@igalia.com>
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Martin Robinson 2025-09-03 11:52:15 -07:00 • committed by GitHub
parent 5c7ea4bdee
commit 2c7866eb24
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13 changed files with 173 additions and 49 deletions
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9
tests/wpt/meta/css/cssom-view/idlharness.html.ini vendored
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@ -574,12 +574,3 @@
[Document interface: calling caretPositionFromPoint(double, double, optional CaretPositionFromPointOptions) on document with too few arguments must throw TypeError]
expected: FAIL
[HTMLElement interface: attribute scrollParent]
expected: FAIL
[HTMLElement interface: document.createElement("div") must inherit property "scrollParent" with the proper type]
expected: FAIL
[HTMLElement interface: document.createElement("img") must inherit property "scrollParent" with the proper type]
expected: FAIL