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<!DOCTYPE HTML>
<html lang="en">
<head>
<meta charset="utf-8">
<style>
div {
font-size: 40px;
margin: 30px;
width: 234px;
height: 51px;
color: blue;
}
</style>
</head>
<body>
<div>Hello world!</div>
<iframe
width="300"
height="300"
></iframe>
</body>
</html>