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>
This is an implementation of the `prevent_scroll` feature in the focus
transaction system. It allows to control whether focusing an element
should prevent scrolling or not.
Spec:
https://html.spec.whatwg.org/multipage/interaction.html#dom-focusoptions-preventscroll
Testing: Existing WPT tests
Signed-off-by: abdelrahman1234567 <abdelrahman.hossameldin.awadalla@huawei.com>
