[Webkit-unassigned] [Bug 275819] New: `backdrop-filter` is incorrectly applied when element has (positioned) sibling

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=275819

            Bug ID: 275819
           Summary: `backdrop-filter` is incorrectly applied when element
                    has (positioned) sibling
           Product: WebKit
           Version: Other
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: no-reply at rnwest.engineer

Created attachment 471731

  --> https://bugs.webkit.org/attachment.cgi?id=471731&action=review

Test case reduction

See the attached test case. When the header element has only one child with a backdrop-filter applied to it, everything works fine. When the header element has two children, with the backdrop-filter applied to the younger child (which comes first in the stacking order), the resulting backdrop seems to include the older child as well. This can be seen by the light text shadow (caused by the blur and the color inversion), which should not be there. The test case is rendered correctly by Firefox and Chromium (without the light text shadow).

WebKit version: WebKitGTK 2.44.2 (Epiphany Browser on Linux)

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