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      • css教程之CSS 結構和規則

      • 2015-01-23 15:22 來源:未知

      CSS 結構和規則(相關css教程

      基本語法

       規則

      選擇符

        任何HTML元素都可以是一個CSS1的選擇符。選擇符僅僅是指向特別樣式的元素。例如,
      P { text-indent: 3em }
        當中的選擇符是P
      類選擇符
        單一個選擇符能有不同的CLASS(類),因而允許同一元素有不同樣式。例如,一個網頁制作者也許希望視其語言而定,用不同的顏色顯示代碼 :
      code.html { color: #191970 }
      code.CSS  { color: #4b0082 }
        以上的例子建立了兩個類,CSShtml,供HTML的CODE元素使用。CLASS屬性是用于在HTML中以指明元素的類,例如,
      <P CLASS=warning>每個選擇符只允許有一個類。
      例如,code.html.proprietary是無效的。</p>
        類的聲明也可以無須相關的元素:
      .note { font-size: small }
        在這個例子,名為note的類可以被用于任何元素。
      一個良好的習慣是在命名類的時候,根據它們的功能而不是根據它們的外觀。上述例子中的note類也可以命名為small,但如果網頁制作者決定改變這個類的樣式,使得它不再是小字體的話,那么這個名字就變得毫無意義了。
      ID 選擇符
        ID 選擇符個別地定義每個元素的成分。這種選擇符應該盡量少用,因為他具有一定的局限。一個ID選擇符的指定要有指示符"#"在名字前面。例如,ID選擇符可以指定如下:
      #svp94O { text-indent: 3em }
        這點可以參考HTML中的ID屬性:
      <P ID=svp94O>文本縮進3em</P>
      關聯選擇符
        關聯選擇符只不過是一個用空格隔開的兩個或更多的單一選擇符組成的字符串。這些選擇符可以指定一般屬性,而且因為層疊順序的規則,它們的優先權比單一的選擇符大。例如, 以下的上下文選擇符
      P EM { background: yellow }
        是P EM。這個值表示段落中的強調文本會是黃色背景;而標題的強調文本則不受影響。
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