回答編集履歴
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ちょうせい
test
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@@ -1 +1,45 @@
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じつは「<!DOCTYPE html>」を外せばいけるんですけど・・・
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# sample
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```CSS
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<!DOCTYPE HTML>
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<style>
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.line {
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width: 500px;
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height: 12px;
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background-color: yellow;
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}
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.line:after {
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content: "";
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display: block;
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background-color: blue;
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width: 50%;
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height: 12px;
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}
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</style>
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test
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<div class="line"></div>
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test
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```
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