[Webkit-unassigned] [Bug 162760] New: [css-filters-2] Parent stacking context of backdrop-filter needs to isolate itself

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=162760

            Bug ID: 162760
           Summary: [css-filters-2] Parent stacking context of
                    backdrop-filter needs to isolate itself
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: trchen at chromium.org

Similar to bug 129154, backdrop-filter should only take inputs from the innermost enclosing stacking context, as spec'd in:

https://drafts.fxtf.org/filters-2/#BackdropFilterProperty

"""The first filter function or filter reference in the list takes the element’s BackgroundImage as the input image. Subsequent operations take the output from the previous filter function or filter reference as the input image. filter element reference functions can specify an alternate input, but still uses the previous output as its SourceGraphic."""

https://drafts.fxtf.org/filters/#valdef-in-backgroundimage

"""BackgroundImage
This keyword represents the back drop defined by the current isolation group behind the filter region at the time that the filter element was invoked. See isolation property [COMPOSITING-1]."""

Chromium's fix along with a layout test can be found here: https://codereview.chromium.org/2375203003/

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