[css]擬似要素と擬似クラスの意味や注意点、メリットデメリットなどを解説します！[初心者対応]
Synopsis
CSSには、セレクタに設定する擬似要素（:before、:afterなど）と擬似クラス（:hover、:nth-child(数字)、visitedなど）があり、 ...
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