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Test Info:
- Manifest: dom/base/crashtests/crashtests.list
<script>
document.addEventListener("DOMContentLoaded", () => {
  let c = a.attachShadow({mode: "open"})
  let b = document.getElementById("host").shadowRoot.getElementById("b");
  window.parent.getSelection().setBaseAndExtent(b, 0, c, 0)
})
</script>
<div id="a">A</div>
<video>
  <div id="host">
    <template shadowrootmode="open">
      <video id="b">
    </template>
  </div>
</video>