slots-dynamic.html | Explore in Territory

<!DOCTYPE html>
<div id='host'>
  <div slot='s1'>c1</div>
  <div slot='s2'>c2</div>
</div>
<script>
'use strict';
const slot = document.createElement('slot');
slot.setAttribute('name', 's1');
host.attachShadow({mode: 'open'}).appendChild(slot);
</script>

chromium/third_party/blink/web_tests/shadow-dom/slots-dynamic.html