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<!DOCTYPE HTML>↩
<html>↩
<head>↩
<style>↩
div {↩
position: absolute;↩
top: 0; left: 0;↩
width: 600px;↩
height: 500px;↩
background: yellow;↩
opacity: 0.3;↩
}↩
</style>↩
</head>↩
<body>↩
<div></div>↩
</body>↩
</html>↩