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chromium/third_party/blink/web_tests/external/wpt/css/css-conditional/container-queries/fieldset-legend-change.html 

<!doctype html>
<title>CSS Container Queries Test: inline-size query changes rendered legend in fieldset</title>
<link rel="help" href="https://drafts.csswg.org/css-conditional-5/#size-container">
<link rel="match" href="fieldset-legend-change-ref.html">
<p>Pass if the rendered legend below is "PASS"</p>
<style>
  fieldset {
    width: 200px;
    container-type: inline-size;
  }
  .wide { width: 400px; }

  @container (min-width: 300px) {
    #fail {
      display: none;
    }
  }
</style>
<fieldset id="fieldset">
  <legend id="fail">FAIL</legend>
  <legend>PASS</legend>
</fieldset>
<script>
  fieldset.offsetTop;
  fieldset.className = "wide";
</script>