chromium/third_party/blink/web_tests/external/wpt/css/css-text/white-space/remove-slotted-with-whitespace-sibling.html

<!doctype html>
<link rel="help" href="https://drafts.csswg.org/css-text-3/#white-space-rules">
<link rel="match" href="../../reference/pass_if_two_words.html">
<p>There should be a space between "two" and "words" below.</p>
<div id="host">two<div id="rm"></div> <span>words</span></div>
<script>
  let root = host.attachShadow({mode:"open"});
  root.innerHTML = "<slot></slot>";
  host.offsetTop;
  rm.slot = "unknown";
</script>