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chromium/third_party/blink/web_tests/compositing/gestures/gesture-tapHighlight-lines-and-float-in-multicol.html 

<!DOCTYPE html>
<script src="resources/link-highlight-helper.js"></script>
<link rel="stylesheet" href="resources/link-highlight-style.css">
<style>
  a:link, a:visited { color: red; }
</style>
<div style="columns:5; width: 580px; column-gap:20px; column-fill:auto; height:100px; line-height:30px; orphans:1; widows:1;">
  <br>
  <br>
  <div style="float:left; width:100%; height:100px; break-inside:avoid;"></div>
  <a class="opaqueHighlight" href="" id="highlightTarget">
    &nbsp;xxx&nbsp;<br>
    &nbsp;xxx&nbsp;<br>
    &nbsp;xxx&nbsp;<br>
    &nbsp;xxx&nbsp;<br>
    &nbsp;xxx&nbsp;<br>
    &nbsp;xxx&nbsp;<br>
    &nbsp;xxx&nbsp;<br>
    &nbsp;xxx&nbsp;<br>
  </a>
</div>
<p>This test is successful if there are eight green rectangles and no red above.</p>
<script>
  onload = testHighlightTarget;
</script>