prevent-extensions-crash.html

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This WPT test may be referenced by the following Test IDs:
- /custom-elements/prevent-extensions-crash.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset="utf-8">

<title>Check for crash at step #12 of HTML Constructors</title>

<meta name='author' href='mailto:masonf@chromium.org'>

<link rel='help' href='https://html.spec.whatwg.org/multipage/dom.html#html-element-constructors'>

<link rel='help' href='https://crbug.com/1197894'>

<uh-oh></uh-oh>

<script type="module">

  Reflect.preventExtensions(document.querySelector('uh-oh'));

  customElements.define('uh-oh', class extends HTMLElement {});

</script>

This test passes if it does not crash.