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      • css教程之發展概述

      • 2015-01-23 15:09 來源:未知
      發展概述(相關css教程
        今天,越來越多的瀏覽器實現了樣式表,允許改善整個展示同時保留平臺獨立性的獨有特性開闊了網頁制作者的視野。樣式表的優點變得更明顯,雖然不斷地為展示效果而加入更多的HTML標記是一個缺點。
        Netscape的BODY屬性現在更加廣泛地被網頁所應用,而且成為了HTML 3.2的標準。可是,BGCOLORTEXT和其他屬性的靈活程度完全比不上樣式表。大部分的背景圖象會任由網頁不能讓那些只有16色顯示的人所接受;而對于一些網頁256色仍很難接受。使用傳統的BODY屬性,一個網頁制作者必須權衡使用背景圖象的好處是否比付出的代價還重;使用樣式表的話,網頁制作者可以用一些不同的樣式表提交一批不同的圖象,以便用戶可以根據自己的系統可以顯示的顏色而選擇是“24位樣式表”或“8位樣式表”。如果網頁制作者提供的樣式表都不適合用戶,用戶只要忽略網頁制作者的樣式就是了。
        樣式表可以令到網頁制作者的工作更加輕松。當每個水平規則的語句都需要使用<HR WIDTH="75%" SIZE=5 ALIGN=center>的時候,網頁制作者將覺得非常麻煩。使用樣式表,只需要指定這樣的參數一次,樣式就會被整個網站所應用。而且如果網頁制作者覺得WIDTH="50%"會更好的話,那么他只需要在一處地方改變這個參數,而不是找遍幾百頁來更改HTML。不僅僅如此,當一個文件包含了所有的樣式信息時,樣式表還可以減少下載的時間呢。
        樣式表也為他們提供的展示效果的項目給予更多的靈活性。屬性,例如顏色、背景、邊界、邊框和許多的更多都能被所有的元素所應用。僅僅使用HTML和它專有的擴展,必須依賴像BGCOLOR之類的屬性,而這些屬性只對于少數的一些元素有效。樣式表給予應用一個樣式到所有的段落、或所有的二級標題、或所有的強調文字很大的靈活性。
        使用樣式表,網頁制作者可以使用文本縮進屬性來縮進文本,而不是借助丑陋的拙集,如<DD><IMG SRC="blank.gif" WIDTH=10 ALT="">帶來許多負面的周邊效果。邊界可以被更改而不用將整頁放入到表格中。樣式表也可以減少文件的找尋和替換;如果網頁制作者決定改變網站中所有段落的縮進,他只需要改變樣式表中的一行就行了。
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