p:first-letter { font-size: 2em; } p:first-letter { font-size: 3em; } p:first-letter { font-size: 4em; } /* 《程式語言教學誌》的範例程式 http://pydoing.blogspot.com/ 檔名:demo43.css 功能:示範 CSS 2.1 樣式表的使用 作者:張凱慶 時間:西元 2011 年 7 月 */
三個規則的選取項都是 p:first-letter ,但樣式各不相同,我們以下面的 HTML 文件載入
<html> <head> <title>網頁標題</title> <link rel="stylesheet" type="text/css" href="demo43.css"> </head> <body> <p>You ever have that feeling where you're not sure if you're awake or still dreaming?</p> <p>A prison for your mind.</p> <p>Free your mind.</p> <p>Believe the unbelievable.</p> <p>There is no spoon.</p> <p>I can only show you the door, you have to walk through it.</p> <p>Choice. The problem is choice.</p> <p>Then tomorrow we may all be dead, but how would that be different from any other day?</p> <p>I have dreamed a dream, but now that dream has gone from me.</p> <p>Choice is an illusion, created between those with power, and those without.</p> <p>Because I choose to.</p> <p>Everything that has a beginning has an end.</p> </body> </html> <!-- 《程式語言教學誌》的範例程式 http://pydoing.blogspot.com/ 檔名:demo43.html 功能:示範 CSS 2.1 樣式表的使用 作者:張凱慶 時間:西元 2011 年 7 月 -->
瀏覽器 (broswer) 開啟如下
每一個 <p> 的第一個字母都是 4em ,符合最後出現的規則。
若是加入重大宣告 !important 於分號前,可改變該宣告 (declaration) 的權重 (weight) ,使之具有優先權,例如
p:first-letter { font-size: 2em !important; } p:first-letter { font-size: 3em; } p:first-letter { font-size: 4em; } /* 《程式語言教學誌》的範例程式 http://pydoing.blogspot.com/ 檔名:demo43.css 功能:示範 CSS 2.1 樣式表的使用 作者:張凱慶 時間:西元 2011 年 7 月 */
我們以下面的 HTML 文件載入
<html> <head> <title>網頁標題</title> <link rel="stylesheet" type="text/css" href="demo44.css"> </head> <body> <p>You ever have that feeling where you're not sure if you're awake or still dreaming?</p> <p>A prison for your mind.</p> <p>Free your mind.</p> <p>Believe the unbelievable.</p> <p>There is no spoon.</p> <p>I can only show you the door, you have to walk through it.</p> <p>Choice. The problem is choice.</p> <p>Then tomorrow we may all be dead, but how would that be different from any other day?</p> <p>I have dreamed a dream, but now that dream has gone from me.</p> <p>Choice is an illusion, created between those with power, and those without.</p> <p>Because I choose to.</p> <p>Everything that has a beginning has an end.</p> </body> </html> <!-- 《程式語言教學誌》的範例程式 http://pydoing.blogspot.com/ 檔名:demo44.html 功能:示範 CSS 2.1 樣式表的使用 作者:張凱慶 時間:西元 2011 年 7 月 -->
<p> 的第一個字母就變成 2em 了
中英文術語對照 | |
---|---|
樣式表 | style sheet |
選取項 | selector |
規則 | rule |
瀏覽器 | broswer |
宣告 | declaration |
權重 | weight |
您可以繼續參考
基本概念
單位
選取器
@import 規則
階層
元素呈現方式 display
相關目錄
CSS 2.1 快速導覽
HTML, CSS 教材
首頁
參考資料
http://www.w3.org/TR/CSS21/cascade.html
https://developer.mozilla.org/en/CSS/Getting_Started/Cascading_and_inheritance
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