<html>
<head>
    <style>
        :empty {
            background: #000;
        }

        * {
            -webkit-user-modify: read;
        }
    </style>
    <script>
      onload = () => {
        if (window.testRunner)
          testRunner.dumpAsText();
        let span0 = document.createElement('span');
        span0.append('PASS if no crash');
        document.documentElement.prepend(span0);
        document.designMode = 'on';
        document.execCommand('SelectAll');
        document.execCommand('FontSizeDelta', false, '1');
      };
    </script>
</head>
</html>
