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      VB.net 2010 視頻教程 VB.net 2010 視頻教程 VB.net 2010 視頻教程
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      首頁 > 網站開發 > css >
      • div+css視頻教程之CSS 高級語法

      • 2015-07-21 21:18 來源:未知
      CSS 高級語法
      選擇器的分組
      你可以對選擇器進行分組,這樣,被分組的選擇器就可以分享相同的聲明。用逗號將需要分組的選擇器分開。在下面的例子中,我們對所有的標題元素進行了分組。所有的標題元素都是綠色的。
      h1,h2,h3,h4,h5,h6 {
        color: green;
        }
      繼承及其問題
      根據 CSS,子元素從父元素繼承屬性。但是它并不總是按此方式工作。看看下面這條規則:
      body {
           font-family: Verdana, sans-serif;
           }
      根據上面這條規則,站點的 body 元素將使用 Verdana 字體(假如訪問者的系統中存在該字體的話)。
      通過 CSS 繼承,子元素將繼承最高級元素(在本例中是 body)所擁有的屬性(這些子元素諸如 p, td, ul, ol, ul, li, dl, dt,和 dd)。不需要另外的規則,所有 body 的子元素都應該顯示 Verdana 字體,子元素的子元素也一樣。并且在大部分的現代瀏覽器中,也確實是這樣的。
      但是在那個瀏覽器大戰的血腥年代里,這種情況就未必會發生,那時候對標準的支持并不是企業的優先選擇。比方說,Netscape 4 就不支持繼承,它不僅忽略繼承,而且也忽略應用于 body 元素的規則。IE/Windows 直到 IE6 還存在相關的問題,在表格內的字體樣式會被忽略。我們又該如何是好呢?
      友善地對待Netscape 4
      幸運地是,你可以通過使用我們稱為 "Be Kind to Netscape 4" 的冗余法則來處理舊式瀏覽器無法理解繼承的問題。
      body  {
           font-family: Verdana, sans-serif;
           }
       
      p, td, ul, ol, li, dl, dt, dd  {
           font-family: Verdana, sans-serif;
           }
      4.0 瀏覽器無法理解繼承,不過他們可以理解組選擇器。這么做雖然會浪費一些用戶的帶寬,但是如果需要對 Netscape 4 用戶進行支持,就不得不這么做。
      繼承是一個詛咒嗎?
      如果你不希望 "Verdana, sans-serif" 字體被所有的子元素繼承,又該怎么做呢?比方說,你希望段落的字體是 Times。沒問題。創建一個針對 p 的特殊規則,這樣它就會擺脫父元素的規則:
      body  {
           font-family: Verdana, sans-serif;
           }
       
      td, ul, ol, ul, li, dl, dt, dd  {
           font-family: Verdana, sans-serif;
           }
       
      p  {
           font-family: Times, "Times New Roman", serif;
           }
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