[Webkit-unassigned] [Bug 78453] New: Needs an internal flag to accept multiple shadow roots for the purpose of tests

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=78453

           Summary: Needs an internal flag to accept multiple shadow roots
                    for the purpose of tests
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: HTML DOM
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: hayato at chromium.org
                CC: dglazkov at chromium.org, rolandsteiner at chromium.org,
                    dominicc at chromium.org, morrita at google.com
            Blocks: 77499


We need a simple internal flag on ShadowRootList by which it accepts multiple shadow tree.

We should avoid accepting multiple shadow roots until multiple shadow tree becomes stable.
At the same time, we need to test multiple shadow tree.

Therefore it might be better to have a flag (maybe static bool member variable is enough for the purpose of test) and expose the setter through window.internals.

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