[Webkit-unassigned] [Bug 257412] New: jsc_fuz/wktr: RELEASE_ASSERT(!isInTopLayer()); WebCore::Element::addToTopLayer() + 508 (Element.cpp:3849)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=257412

            Bug ID: 257412
           Summary: jsc_fuz/wktr: RELEASE_ASSERT(!isInTopLayer());
                    WebCore::Element::addToTopLayer() + 508
                    (Element.cpp:3849)
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ntim at apple.com

Testcase:

```
<script>
  onload = () => {
    dialog0.showModal();
    dialog0.open = false;
    dialog0.showPopover();
  };
</script>
<dialog id="dialog0" popover=""></dialog>
```

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