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<!DOCTYPE html>
<link rel=author href="mailto:jarhar@chromium.org">
<link rel=author href="mailto:futhark@chromium.org">
<div id="dialog">
<div id="item"></div>
</div>
<script>
const itemRoot = item.attachShadow({mode: 'open'});
const dialogRoot = dialog.attachShadow({mode: 'open'});
dialogRoot.innerHTML = '<dialog><slot></slot></dialog>';
dialog.offsetTop;
dialogRoot.firstChild.showModal();
</script>