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chromium/third_party/blink/web_tests/external/wpt/css/css-transforms/size-change-under-backface-visibility-hidden-ref.html 

<!doctype HTML>
<title>CSS Test</title>
<link rel="author" title="Chris Harrelson" href="mailto:[email protected]" />
Passes if it shows a green 200x200 square.
<div style="will-change: transform; width: 300px; height: 0px">
  <div style="width: 1px; height: 1px; backface-visibility: hidden;">
    <div id=target style="width: 200px; height: 200px; position: relative; background: green; left: 10px;"></div>
  </div>
</div>