[Webkit-unassigned] [Bug 201234] New: webkit-backdrop-filter sometimes leaving empty space between border

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=201234

            Bug ID: 201234
           Summary: webkit-backdrop-filter sometimes leaving empty space
                    between border
           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: jbedard at apple.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 377475

  --> https://bugs.webkit.org/attachment.cgi?id=377475&action=review

wrong

This is probably an issue with sub-pixel layout, it's also a relatively recent regression (last month or 2, although we don't have a test for this and I haven't been paying attention to exactly when it regressed). I was able to reproduce the problem on r248867. The specific css causing this bug is:

.tooltip-content {
    z-index: 50;
    position: absolute;
    -webkit-backdrop-filter: blur(10px) brightness(88%);
    backdrop-filter: blur(10px) brightness(88%);
    color: var(--boldInverseColor);
    border: 1px solid #ccc;
    border-radius: 5px;
    padding: 5px;
    font-size: var(--smallSize);
    list-style: none;
    max-width: 600px;
}

I'll attach a screenshot of one of these tooltip behaving correctly and incorrectly.

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