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Test Info:
- Manifest: dom/base/crashtests/crashtests.list
<html>
<head>
  <script>
    function start() {
      window.CustomElement0 = class extends HTMLElement {
        constructor() {
          super()
        }
        connectedCallback() {
          this.before('', custom)
          this.outerHTML = '<input pattern=""value=ð>'
        }
      }
      customElements.define('custom-element-0', CustomElement0)
      document.documentElement.appendChild(custom)
    }
    document.addEventListener('DOMContentLoaded', start)
  </script>
</head>
</html>