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<!doctype html>
<div id="host"></div>
<script>
host.attachShadow({ mode: 'open' }).innerHTML = `
<style>
div { color: green }
</style>
<div></div>
`;
document.body.offsetTop;
host.shadowRoot.styleSheets[0].insertRule("[foo] { color: green }", 0);
host.shadowRoot.querySelector("div").setAttribute("foo", "bar");
</script>
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