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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>