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<!DOCTYPE html>
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<html>
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<head>
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<script>
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function boom()
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{
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var input = document.getElementById("i");
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input.setAttribute('type', "image");
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input.removeAttribute('type');
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input.placeholder = "Y";
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}
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</script>
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</head>
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<body onload="boom();"><input id="i" /></body>
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</html>
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