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chromium/third_party/blink/web_tests/external/wpt/css/css-conditional/container-queries/pseudo-elements-011.html 

<!DOCTYPE html>
<title>CSS Container Queries Test: ::highlight pseudo element on size container</title>
<link rel="help" href="https://drafts.csswg.org/css-conditional-5/#query-container">
<link rel="match" href="pseudo-elements-010-ref.html">
<style>
  #container {
    width: 500px;
    container-type: inline-size;
  }
  #container::highlight(hi) {
    color: red;
    background: transparent;
  }
  @container (width >= 400px) {
    #container::highlight(hi) {
      color: green;
      background: transparent;
    }
  }
</style>
<div id="container">Highlight</div>
<script>
  let highlight_range = document.createRange();
  highlight_range.selectNode(container);
  CSS.highlights.set("hi", new Highlight(highlight_range));
</script>