[Webkit-unassigned] [Bug 215732] Crash when interacting with certain elements in WebCore::EventHandler::dispatchMouseEvent

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=215732

Liz Mitchell <lizmitchell at google.com> changed:

           What    |Removed                     |Added
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                 CC|                            |lizmitchell at google.com

--- Comment #1 from Liz Mitchell <lizmitchell at google.com> ---
This error is related to delegatesFocus. When set to true, the tab will crash when the user creates focus by clicking on the ShadowRoot's content.

If the element is programmatically focused via element.focus(), the tab does not crash and element.shadowRoot.activeElement is properly set to the delegated focus target.

If delegatesFocus is set to false, the tab does not crash when the user clicks on the ShadowRoot's content.

Crash: https://jsbin.com/hudimuseya/edit?html,output
No crash: https://jsbin.com/hegogibike/edit?html,output

Safari TP 112 (Safari 14.0, WebKit 15610.1.25.5.1)

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