[Webkit-unassigned] [Bug 93498] New: Older shadow root incorrectly rendered when multiple shadow roots containing style tags have been constructed

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=93498

           Summary: Older shadow root incorrectly rendered when multiple
                    shadow roots containing style tags have been
                    constructed
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh Intel
        OS/Version: Mac OS X 10.7
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: HTML DOM
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: sorvell at chromium.org
                CC: dglazkov at chromium.org, dominicc at chromium.org


Created an attachment (id=157255)
 --> (https://bugs.webkit.org/attachment.cgi?id=157255&action=review)
Reduction producing incorrect rendering + the expected rendering

A shadow root is incorrectly rendered in the following construction:

1. make an element and insert it into dom.
2. create a shadow root that contains a style element.
3. make another element and insert it into dom.
4. create a shadow root on this element that contains a style element.
5. create another shadow root on the element.

The rendering of the 2nd element is incorrect. For this element it's expected that the 2nd shadow root will replace the first; however, it's rendered in addition to the first.

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