[Webkit-unassigned] [Bug 129307] New: [CSS Blending] Blending operation is not isolated when setting z-index on parent from javascript

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=129307

           Summary: [CSS Blending] Blending operation is not isolated when
                    setting z-index on parent from javascript
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: mitica at adobe.com


Consider the following scenario:

parent element and child element having -webkit-mix-blend-mode other than normal.
Set z-index and position for the parent from Javascript. Blending is not isolated, ie the blend operation is performed with all the backdrop.
Instead, blending should only be performed with the contents of the parent element.

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