Revision control

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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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.container {
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margin-left: 100px;
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margin-top: 100px;
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}
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.child {
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position: relative;
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width: 100px;
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height: 100px;
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background-color: black;
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}
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</style>
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</head>
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<body>
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<div class="container">
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<div class="child"></div>
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</div>
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</body>
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</html>