[Webkit-unassigned] [Bug 94304] New: Needs pseudo class when an author shadow root is attached for replaced element

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=94304

           Summary: Needs pseudo class when an author shadow root is
                    attached for replaced element
           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: shinyak at chromium.org
                CC: dglazkov at chromium.org, dominicc at chromium.org,
                    hayato at chromium.org, morrita at google.com,
                    tasak at google.com
            Blocks: 82313


Styling for replaced element when a ShadowRoot is attached has a problem.

Basically the host element has various styles. We want to reset such styles when an Author Shadow DOM is added, since we want the host element to behave like just a div.
It seems good to have a pseudo class to be enabled when the replaced element is 'really' replaced, which means there is an inner special element in the User Agent Shadow DOM in replaced elements.

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