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chromium/third_party/blink/web_tests/compositing/squashing/clip-to-squashed-layer-size.html 

<!doctype html>
</head>
<body>
  <div style=" width: 1px; height: 100px; will-change: transform; position:absolute; top:0px; background-color: lightgray">
  </div>
  <div style="width: 10px; height: 10px; overflow: hidden; position: absolute; left: 0px; top: 0px; ">
    <div style="height: 100px; width:100px; background-color:lightgreen" />
    </div>           
  </div>
  <div style="left: 0px; height: 9px; width: 9px; position:absolute; top:99px; background-color: blue">
</body>