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chromium/third_party/blink/web_tests/external/wpt/html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/fieldset-dynamic-baseline-ref.html 

<!DOCTYPE html>
baseline
<fieldset style="display: inline-block;">
  <div style="position: relative;">
    line1<br>line2
  </div>
</fieldset>