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chromium/third_party/blink/web_tests/external/wpt/css/css-flexbox/fieldset-baseline-alignment.html 

<!DOCTYPE html>
<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1305890">
<link rel="match" href="fieldset-baseline-alignment-ref.html">
<div style="display: flex; align-items: baseline;">
  baseline<fieldset><legend>legend</legend>content</fieldset>
</div>