Revision control

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<style>
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div {
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position: absolute;
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top: 0;
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left: 0;
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height: 100px;
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width: 100px;
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background-color: black;
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translate: 100px 100px;
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rotate: 180deg;
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}
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div::after {
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content: "";
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position: absolute;
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top: 0;
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left: 0;
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width: 50%;
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height: 50%;
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background-color: gray;
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}
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</style>
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<div></div>