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chromium/third_party/blink/web_tests/external/wpt/css/selectors/dir-pseudo-update-document-element-ref.html 

<!DOCTYPE html>
<html>
<head>
<style>

div {
    width: 100px;
    height: 100px;
    float: left;
    background-color: green;
}

</style>
</head>
<body>
<div></div>
</body>
</html>