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chromium/third_party/blink/web_tests/external/wpt/css/css-flexbox/fieldset-as-item-overflow-ref.html 

<!DOCTYPE html>
<div style="width: 100px; height: 100px; border: solid;">
  <div style="overflow-y: scroll; max-height: 100%;">
    <div style="height: 200px; background: green;"></div>
  </div>
</div>