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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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#parent {
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width: 200px;
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height: 200px;
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margin-left: 10px;
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background: green;
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}
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#child {
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width: 90px;
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height: 90px;
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background: red;
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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="parent">
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<div id="child"></div>
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</div>
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</body>
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</html>
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