layout-slot-no-longer-assigned.html

<!DOCTYPE html>
<title>Layout using slot elements</title>
<link rel="author" title="Hayato Ito" href="mailto:[email protected]"/>
<link rel="help" href="https://dom.spec.whatwg.org/#shadow-tree-slots">
<link rel="match" href="reference/empty.html"/>
<div id="host"></div>
<script>
const host = document.querySelector('#host');
const sr = host.attachShadow({ mode: 'open' });
sr.innerHTML = '<slot name=s1></slot>'
host.innerHTML = '<div id=d1 slot=s1></div>';

document.body.offsetLeft;
document.querySelector('#d1').setAttribute('slot', 's2');
</script>

chromium/third_party/blink/web_tests/external/wpt/shadow-dom/layout-slot-no-longer-assigned.html