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<!DOCTYPE HTML>
<html>
<body>
<div style="width:100px; height:100px; background:blue; opacity:0.5;">Hello</div>
</body>
</html>
<!DOCTYPE HTML>
<html>
<body>
<div style="width:100px; height:100px; background:blue; opacity:0.5;">Hello</div>
</body>
</html>