1449243.html - mozsearch

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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>