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<!DOCTYPE html>
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<html>
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<head>
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<style>
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div {
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background-color: green;
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}
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div[mixedCase=true] {
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background-color: red ! important;
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}
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</style>
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</head>
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<body onload="document.getElementById('d').removeAttribute('mixedcase');">
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<div id="d" mixedcase="true">text</div>
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</body>
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</html>
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