[Webkit-unassigned] [Bug 77603] New: Element should be able to take built-in shadow tree.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=77603

           Summary: Element should be able to take built-in shadow tree.
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: HTML DOM
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: shinyak at chromium.org


Let's consider adding a new shadow subtree to element having a built-in shadow subtree.
Such element may have a code like:
  ensureShadowRoot()->firstChild() ...

If ensureShadowRoot() returns the youngest shadow root, this code may crash.
We should guarantee that elements can take built-in shadow root.

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