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chromium/third_party/blink/web_tests/compositing/gestures/gesture-tapHighlight-multicol.html 

<!DOCTYPE html>
<script src="resources/link-highlight-helper.js"></script>
<link rel="stylesheet" href="resources/link-highlight-style.css">
<div style="columns: 2; width: 300px; height: 100px">
  <a class="opaqueHighlight" href="" id="highlightTarget">
    <div style="width: 150px; height: 100px; display: inline-block; background: red">Target</div>
    <div style="width: 150px; height: 100px; display: inline-block; background: red">Link</div>
  </a>
</div>
This test is successful if "Target Link" and red area above are covered by two green rectangles with square corners.
<script>
onload = testHighlightTarget;
</script>