[Webkit-unassigned] [Bug 164606] New: Dynamic changes to backdrop filter inside opacity behave incorrectly

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=164606

            Bug ID: 164606
           Summary: Dynamic changes to backdrop filter inside opacity
                    behave incorrectly
    Classification: Unclassified
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: All
                OS: macOS 10.12
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mstange at themasta.com
                CC: simon.fraser at apple.com

Created attachment 294396
  --> https://bugs.webkit.org/attachment.cgi?id=294396&action=review
testcase

Steps to reproduce:
 1. Open the attached testcase.
 2. Click the button twice.

Expected results:
The initial state of the page should appear the same as the state after clicking the button twice.

Actual results:
The second click on the button turns the element with the backdrop filter white. On page load it was gray.

I don't actually know what the correct behavior here is, but it should at least be consistent.

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