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      • css教程之偽類和偽元素

      • 2015-01-23 22:43 來源:未知

      偽類和偽元素

      (相關css教程

        偽類偽元素是特殊的類和元素,能自動地被支持CSS的瀏覽器所識別。偽類區別開不同種類的元素(例如,visited links(已訪問的連接)和active links(可激活連接)描述了兩個定位錨(anchors)的類型)。偽元素指元素的一部分,例如段落的第一個字母。
        偽類或偽元素規則的形式如
      選擇符:偽類 { 屬性: 值 }
        或
      選擇符:偽元素 { 屬性: 值 }
        偽類和偽元素不應用HTML的CLASS屬性來指定。一般的類可以與偽類和偽元素一起使用,如下:
      選擇符.類: 偽類 { 屬性: 值 }
        或
      選擇符.類: 偽元素 { 屬性: 值 }

       定位錨偽類

        偽類可以指定A元素以不同的方式顯示連接(links)、已訪問連接(visited links)和可激活連接(active links)。定位錨元素可給出偽類linkvisitedactive。一個已訪問連接可以定義為不同顏色的顯示,甚至不同字體大小和風格。
        一個有趣的效果是使當前(或“可激活”)連接以不同顏色、更大的字體顯示。然后,當網頁的已訪問連接被重選時,又以不同顏色、更小字體顯示。這個樣式表的示例如下:
      A:link    { color: red }
      A:active  { color: blue; font-size: 125% }
      A:visited { color: green; font-size: 85% }

       首行偽元素

        通常在報紙上的文章,例如Wall Street Journal中的,文本的首行都會以粗印體而且全部大寫地展示。CSS1包括了這個功能,將其作為一個偽元素。首行偽元素可以用于任何塊級元素(例如PH1等等)。以下是一個首行偽元素的例子:
      P:first-line {
        font-variant: small-caps;
        font-weight: bold }

       首個字母偽元素

        首個字母偽元素用于加大(drop caps)和其他效果。含有已指定值選擇符的文本的首個字母會按照指定的值展示。一個首個字母偽元素可以用于任何塊級元素。例如:
      P:first-letter { font-size: 300%; float: left }
        會比普通字體加大三倍。
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