[Webkit-unassigned] [Bug 163497] New: Dynamically-added backdrop filter to clip-path'd element with 3D transform renders incorrectly (without clip)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=163497

            Bug ID: 163497
           Summary: Dynamically-added backdrop filter to clip-path'd
                    element with 3D transform renders incorrectly (without
                    clip)
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: thorton at apple.com
                CC: simon.fraser at apple.com

Steps to Reproduce:

1. Open test case.

Expected: Blur should be clipped to the red circle.
Actual: It is not; the whole bounding box of the element is backdrop blurred.

Notes:
If #blur doesn't get a layer, everything is fine.
If the backdrop-filter is applied to #blur in the style instead of dynamically added after the fact, everything is fine.
This affects adding backdrop-filters via the inspector, too, of course (and made me think I was crazy for quite some time before realizing what was up).

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