[Webkit-unassigned] [Bug 236326] New: Blurred element is not properly repainted on hover

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=236326

            Bug ID: 236326
           Summary: Blurred element is not properly repainted on hover
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Mac (Apple Silicon)
                OS: macOS 12
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Compositing
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jed at jedfox.com
                CC: simon.fraser at apple.com

Created attachment 451301

  --> https://bugs.webkit.org/attachment.cgi?id=451301&action=review

Small reproduction

The included test file contains an HTML element with the class "spoiler" and the following CSS:

    .spoiler:not(:hover) {
      filter: blur(10px);
    }

The behavior I expected is that when hovering over the element, all traces of the blur will be removed and the unblurred text will become visible.

The actual behavior I’m seeing is that while the portion of the page inside the element’s content rect is correctly updated, the portions of the blur that extend past the content rect remain visible.

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