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<!doctype html>
<html>
<meta charset="utf-8">
<link rel="author" title="Vladimir Levin" href="mailto:vmpstr@chromium.org">
<style>
#target {
width: 50px;
height: 50px;
background-color: green;
opacity: 0.4;
}
</style>
<body>
<div id="target"></div>
</body>
</html>