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chromium/third_party/blink/web_tests/external/wpt/css/css-flexbox/percentage-heights-010.html 

<!DOCTYPE html>
<title>A height: 100% descendant should trigger a relayout when stretching.</title>
<link rel="help" href="https://drafts.csswg.org/css-flexbox-1/#definite-sizes" />
<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1043071" />
<link rel="match" href="../reference/ref-filled-green-100px-square.xht" />
<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<div style="display: flex; width: 100px;">
  <div style="display: flex; flex-direction: column; flex: 1; min-height: 100px;">
    <div style="flex: 1; background: red;">
      <div style="height: 100%; background-color: green;"></div>
    </div>
  </div>
</div>