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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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components/script_bindings/webidls/HTMLElement.webidl
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@ -64,6 +64,7 @@ interface HTMLElement : Element {
// http://dev.w3.org/csswg/cssom-view/#extensions-to-the-htmlelement-interface
partial interface HTMLElement {
// CSSOM things are not [Pure] because they can flush
readonly attribute Element? scrollParent;
readonly attribute Element? offsetParent;
readonly attribute long offsetTop;
readonly attribute long offsetLeft;