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chromium/third_party/blink/web_tests/external/wpt/css/css-flexbox/percentage-heights-014.html 

<!DOCTYPE html>
<link rel="help" href="https://drafts.csswg.org/css-flexbox-1/">
<link rel="match" href="../reference/ref-filled-green-100px-square-only.html">
<meta name="assert" content="A flex-item with a replaced height descendant should determine its flex-basis correctly when the height of the flexbox changes." />
<p>Test passes if there is a filled green square.</p>
<div id="target" style="display: flex; width: 100px; height: 100px;">
  <div style="height: 50%; flex: 1; background: green;">
    <canvas width=10 height=10 style="height: 100%;"></canvas>
  </div>
  <div style="flex: 1;"></div>
</div>
<script>
  document.body.offsetTop;
  document.getElementById('target').style.height = '200px';
</script>