[webkit-changes] [WebKit/WebKit] 4560c7: [@starting-style] Starting style should inherit fr...

[Antti Koivisto]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: 4560c7e615dbcf3a0d3aa9193297ef30c29edcbd
      https://github.com/WebKit/WebKit/commit/4560c7e615dbcf3a0d3aa9193297ef30c29edcbd
  Author: Antti Koivisto <antti at apple.com>
  Date:   2024-02-20 (Tue, 20 Feb 2024)

  Changed paths:
    M LayoutTests/imported/w3c/web-platform-tests/css/css-transitions/starting-style-cascade-expected.txt
    M Source/WebCore/style/StyleTreeResolver.cpp
    M Source/WebCore/style/StyleTreeResolver.h

  Log Message:
  -----------
  [@starting-style] Starting style should inherit from parent after-change style
https://bugs.webkit.org/show_bug.cgi?id=269781
rdar://123302667

Reviewed by Antoine Quint.

"Starting style inherits from the parent’s after-change style just like after-change style does."

https://drafts.csswg.org/css-transitions-2/#defining-before-change-style

* LayoutTests/imported/w3c/web-platform-tests/css/css-transitions/starting-style-cascade-expected.txt:
* Source/WebCore/style/StyleTreeResolver.cpp:
(WebCore::Style::TreeResolver::resolveStartingStyle const):

Use lastStyleChangeEventStyle as the parent after-change style if there is one.

* Source/WebCore/style/StyleTreeResolver.h:
(WebCore::Style::TreeResolver::scope const):
(WebCore::Style::TreeResolver::parent const):

Canonical link: https://commits.webkit.org/275061@main



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