Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: 6bd49ed6463b56a0ddf86b11d9f2ef5e4183acc7
      
https://github.com/WebKit/WebKit/commit/6bd49ed6463b56a0ddf86b11d9f2ef5e4183acc7
  Author: Ryosuke Niwa <[email protected]>
  Date:   2026-05-15 (Fri, 15 May 2026)

  Changed paths:
    A 
LayoutTests/fast/shadow-dom/style-invalidation-slotted-element-with-author-shadow-root-crash-expected.txt
    A 
LayoutTests/fast/shadow-dom/style-invalidation-slotted-element-with-author-shadow-root-crash.html
    M Source/WebCore/dom/Element.cpp

  Log Message:
  -----------
  ASSERTION FAILED: !shadowRoot() || shadowRoot()->mode() == 
ShadowRootMode::UserAgent
https://bugs.webkit.org/show_bug.cgi?id=314791

Reviewed by Alan Baradlay.

Some callers of userAgentShadowRoot were expecting the function to check shadow 
root's
type and return nullptr when it's not an user-agent shadow root. Do that 
instead of
merely asserting in debug builds.

Test: 
fast/shadow-dom/style-invalidation-slotted-element-with-author-shadow-root-crash.html

* 
LayoutTests/fast/shadow-dom/style-invalidation-slotted-element-with-author-shadow-root-crash-expected.txt:
 Added.
* 
LayoutTests/fast/shadow-dom/style-invalidation-slotted-element-with-author-shadow-root-crash.html:
 Added.
* Source/WebCore/dom/Element.cpp:
(WebCore::Element::userAgentShadowRoot const):

Canonical link: https://commits.webkit.org/313334@main



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