[Webkit-unassigned] [Bug 250981] New: Nullptr crash under CustomPropertyRegistry::registerFromStylesheet

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=250981

            Bug ID: 250981
           Summary: Nullptr crash under
                    CustomPropertyRegistry::registerFromStylesheet
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: koivisto at iki.fi

<style>
  @property --a {
    syntax: 'foo';
    inherits: false;
    initial-value: foo;
  }
</style>
<script>
  onload = () => {
    document.open();
    document.createElement('div').style.width = '0';
  };
</script>

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