個人認識：css偽類即對某個元素的不同狀態提供表現控制。
a:link{color: #FF0000}/* 未訪問的連結 */a:visited{color: #00FF00}/* 已訪問的連結 */a:hover{color: #FF00FF}/* 滑鼠移動到連結上 */a:active{color: #0000FF}/* 選定的連結 */這些是超連結的偽類
p:first-child 偽類的意思是作為副元素的第一個p元素，你的表現如何。
<html><head><style type="text/css">p:first-child{ color: red; } </style></head><body><p>some text</p><p>some text</p></body></html> 匹配第一個p元素！ ：lang偽類 為不同語言定義樣式。<html><head><style type="text/css">q:lang(no) { quotes: "~" "~" }</style></head><body><p>文字<qlang="no">段落中的引用的文字</q>文字</p>為名為no的語言定義引號。</body></html>
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