[Webkit-unassigned] [Bug 258015] New: Resolution context for `::backdrop` must not use element's style as parent style
bugzilla-daemon at webkit.org
bugzilla-daemon at webkit.org
Tue Jun 13 04:42:01 PDT 2023
https://bugs.webkit.org/show_bug.cgi?id=258015
Bug ID: 258015
Summary: Resolution context for `::backdrop` must not use
element's style as parent style
Product: WebKit
Version: WebKit Nightly Build
Hardware: Unspecified
OS: Unspecified
Status: NEW
Severity: Normal
Priority: P2
Component: CSS
Assignee: webkit-unassigned at lists.webkit.org
Reporter: vitaly at igalia.com
Until a very recent "Fullscreen API" spec update [1], `::backdrop` pseudo-element was not supposed to inherit from any element, including its owner element.
But because some style-related functions expect that the parent style is never `nullptr` we use render view style as a parent style [2].
Since it's expected behavior for now across the codebase and the tests were not updated yet, we should use the same approach when creating `ResultionContext` for `::backdrop` pseudo-element.
[1] https://github.com/whatwg/fullscreen/commit/666438755d2f252be1d1f73d8214ac494489d32c
[2] https://github.com/WebKit/WebKit/blob/b872c8723cdbb67aafa46776c2e05066fd4ebbe2/Source/WebCore/rendering/updating/RenderTreeUpdaterGeneratedContent.cpp#L203C6-L204
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