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chromium/third_party/blink/web_tests/external/wpt/css/cssom-view/cssom-getBoundingClientRect-vertical-rl.html 

<!DOCTYPE html>
<title>CSSOM View - 6.1 - getBoundingClientRect tests</title>
<link rel="help" href="http://www.w3.org/TR/cssom-view/#dom-element-getboundingclientrect">
<link rel=match href="cssom-getBoundingClientRect-vertical-rl-ref.html">
<meta name="flags" content="dom">
<body style="writing-mode: vertical-rl; overflow: hidden">
  <div id="target" style="position: absolute; top: 50px; left: 50px; width: 200px; height: 200px; background: red"></div>
  <div id="overlay" style="position: absolute; background: green"></div>
  <script>
    var r = document.getElementById('target').getBoundingClientRect();
    var overlay = document.getElementById('overlay');
    overlay.style.top = r.top + 'px';
    overlay.style.left = r.left + 'px';
    overlay.style.width = r.width + 'px';
    overlay.style.height = r.height + 'px';
  </script>
</body>