[Webkit-unassigned] [Bug 149318] New: Backdrop Filter should not be visible if element has visibility:hidden

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=149318

            Bug ID: 149318
           Summary: Backdrop Filter should not be visible if element has
                    visibility:hidden
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: joepeck at webkit.org
                CC: dino at apple.com, webkit-bug-importer at group.apple.com

* SUMMARY
Backdrop Filter should not be visible if element has visibility:hidden.

* TEST
<style>
.back {
    width: 300px;
    height: 150px;
    margin: 100px;
    background: blue;
}
.top {
    width: 1000px;
    height: 50px;
    position: absolute;
    left: 0;
    top: 150px;
    -webkit-backdrop-filter: blur(50px);
    visibility: hidden;
}
</style>
<div class="back">
    <div class="top"></div>
</div>

* STEPS TO REPRODUCE
1. Open test
  => did not expect div with visibility:hidden to still have blur visible

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