<head>
  <meta>
  <style>
    meta {
      -webkit-user-modify: blah;
      border-inline-style: solid;
    }
    :nth-child(2) {
      -webkit-user-select: all;
    }
    head, script {
      all: unset;
    }
  </style>
  <script>
    onload = () => {
      if (window.testRunner)
          testRunner.dumpAsText();
      console.log("This test passes if it does not crash.");
      document.execCommand('SelectAll');
      document.designMode = 'on';
      document.execCommand('FontSizeDelta', false, '1');
    };
  </script>
</head>