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chromium/third_party/blink/web_tests/fast/ruby/split-ruby-column-percentage-height-descendant.html 

<!DOCTYPE html>
<style>
  div, body, html, img, textarea {
    height: 1%;
  }
  #test2, #rt2, #test3 {
    writing-mode: vertical-lr;
  }
</style>
<div id="test3"><ruby>&nbsp;<rt id="rt3">rt</rt><textarea></textarea></ruby>
<div id="test2"><ruby><textarea></textarea><iframe></iframe><rt id="rt2"></rt>&nbsp;</ruby></div>
<ruby>
  <div>
    <img></img>
  </div>
  <rt></rt>
This test checks that &lt;ruby&gt; doesn't leave any pointer in the percentage
height descendant when it splits a ruby column, or merges ruby columns.<br>
For this test to pass it should not crash or ASSERT!
</ruby>
<script>
document.body.offsetTop;
document.querySelector('#rt3').remove();
if (window.testRunner)
  testRunner.dumpAsText();
</script>