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<html>
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<head>
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<style>
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.green {
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background-color: lime;
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}
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</style>
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</head>
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<body>
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<div id="foo">The background of this div should be green.</div>
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<script>
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document.getElementById('foo').id = 'goo';
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document.getElementById('goo').className = 'green';
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</script>
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</body>
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</html>
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