[Webkit-unassigned] [Bug 149553] New: `mix-blend-mode` on element over an element using `-webkit-backdrop-filter` is not respected if element is not forced onto a layer

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=149553

            Bug ID: 149553
           Summary: `mix-blend-mode` on element over an element using
                    `-webkit-backdrop-filter` is not respected if element
                    is not forced onto a layer
    Classification: Unclassified
           Product: WebKit
           Version: Safari 9
          Hardware: Macintosh
                OS: Mac OS X 10.11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: graouts at webkit.org
                CC: webkit-bug-importer at group.apple.com

Created attachment 261921
  --> https://bugs.webkit.org/attachment.cgi?id=261921&action=review
Testcase

The attached test case shows an element using the `mix-blend-mode` CSS property rendered above an element using the `-webkit-backdrop-filter` property. If the overlaid element is not forced onto a layer, the `mix-blend-mode` property has no effect.

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