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chromium/third_party/blink/web_tests/fast/sub-pixel/sub-pixel-root-layer-expected.html 

<!DOCTYPE html>
<html>
<head>
<style>
#layer {
  position: absolute;
  width: 256px;
  height: 256px;
  left: 200px;
  background: green;
  border: 1px solid black;
}
</style>
</head>
<body>
<div id="layer"></div>
</body>