[webkit-changes] [WebKit/WebKit] c81941: Support ::backdrop renderer on all elements

[Tim Nguyen]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: c819410e71385d58040f24b7ea826966475529c0
      https://github.com/WebKit/WebKit/commit/c819410e71385d58040f24b7ea826966475529c0
  Author: Tim Nguyen <ntim at apple.com>
  Date:   2022-11-30 (Wed, 30 Nov 2022)

  Changed paths:
    M Source/WebCore/css/dialog.css
    M Source/WebCore/css/html.css
    M Source/WebCore/rendering/updating/RenderTreeUpdaterGeneratedContent.cpp

  Log Message:
  -----------
  Support ::backdrop renderer on all elements
https://bugs.webkit.org/show_bug.cgi?id=248456
rdar://102748281

Reviewed by Cameron McCormack.

- Move UA styles for ::backdrop to html.css, since dialog.css is only injected when a dialog element is present.
- Support ::backdrop renderer on elements that can't have generated children, by appending them as the child of RenderView instead.

* Source/WebCore/css/dialog.css:
(dialog::backdrop):
(::backdrop): Deleted.
* Source/WebCore/css/html.css:
(::backdrop):
* Source/WebCore/rendering/updating/RenderTreeUpdaterGeneratedContent.cpp:
(WebCore::RenderTreeUpdater::GeneratedContent::updateBackdropRenderer):

Canonical link: https://commits.webkit.org/257194@main