[webkit-changes] [WebKit/WebKit] f92a59: Do not prepend implicit type selectors to :host rules

[Ahmad Saleem]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: f92a593eb387053331584c5fd709227ce52f6851
      https://github.com/WebKit/WebKit/commit/f92a593eb387053331584c5fd709227ce52f6851
  Author: Ahmad Saleem <ahmad.saleem792+github at gmail.com>
  Date:   2023-10-10 (Tue, 10 Oct 2023)

  Changed paths:
    M LayoutTests/TestExpectations
    M Source/WebCore/css/parser/CSSSelectorParser.cpp

  Log Message:
  -----------
  Do not prepend implicit type selectors to :host rules

https://bugs.webkit.org/show_bug.cgi?id=262907

Reviewed by Tim Nguyen.

Merge: https://chromium-review.googlesource.com/c/chromium/src/+/518019

Web Specification: https://drafts.csswg.org/selectors-4/#featureless

"If a given selector is allowed to match a featureless element, it must do
so while ignoring the default namespace."

:host should not have implicit type selectors pre-pended for
universal rules with default `@namespace`. Default @namespace`
applies to type and universal selectors inside :host(), but a
default `@namespace` rule should not affect :host.
That is, :host matches the host element regardless of any `@namespace`
rules.

* Source/WebCore/css/parser/CSSSelectorParser.cpp:
(CSSSelectorParser::prependTypeSelectorIfNeeded):
* LayoutTests/TestExpectations: Removed now 'failing' test

Canonical link: https://commits.webkit.org/269134@main