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<html>
<head><meta content="text/html; charset=utf-8" http-equiv="Content-Type"></head>
<body>
<button id="btn">button</button>
</body>
</html>
<html>
<head><meta content="text/html; charset=utf-8" http-equiv="Content-Type"></head>
<body>
<button id="btn">button</button>
</body>
</html>