- 副檔名為 .css 的樣式表檔案
- HTML 文件中的 <style> 標籤
- HTML 文件中元素的 style 屬性
第一種是副檔名為 .css 的樣式表檔案，例如以下的 demo01.css
p.demo {
color: white;
background-color: black;
}
/* 《程式語言教學誌》的範例程式
http://pydoing.blogspot.com/
檔名：demo01.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 */就可以利用 HTML 文件中的 <link> 標籤 (tag) 載入 demo01.css
<html>
<head>
<title>網頁標題</title>
<link rel="stylesheet" type="text/css"
href="demo01.css">
</head>
<body>
<p class="demo">
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 class="demo">
Free your mind.</p>
<p>Believe the unbelievable.</p>
<p class="demo">
There is no spoon.</p>
<p>I can only show you the door, you have to walk
through it.</p>
<p class="demo">
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 class="demo">
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 class="demo">
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：demo01.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 -->第二種是把樣式規則 (rule) 寫在HTML 文件中的 <style> 標籤裡，例如
<html>
<head>
<title>網頁標題</title>
<style>
p.demo {
color: white;
background-color: black;
}
</style>
</head>
<body>
<p class="demo">
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 class="demo">
Free your mind.</p>
<p>Believe the unbelievable.</p>
<p class="demo">
There is no spoon.</p>
<p>I can only show you the door, you have to walk
through it.</p>
<p class="demo">
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 class="demo">
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 class="demo">
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：demo02.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 -->第三種則是把樣式規則內嵌進 HTML 文件中元素 (element) 的 style 屬性 (attribute) 中
<html>
<head>
<title>網頁標題</title>
</head>
<body>
<p style="color: white;background-color: black;">
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 style="color: white;background-color: black;">
Free your mind.</p>
<p>Believe the unbelievable.</p>
<p style="color: white;background-color: black;">
There is no spoon.</p>
<p>I can only show you the door, you have to walk
through it.</p>
<p style="color: white;background-color: black;">
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 style="color: white;background-color: black;">
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 style="color: white;background-color: black;">
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：demo03.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 -->以上我們都用了相同的樣式規則，也就是白色的文字，黑色的背景，所以瀏覽器 (browser) 都會得到相同的結果
三種方式各有優缺點，例如利用元素的 style 屬性過於繁複，同時會擴大 HTML 文件的大小，然而這對局部小地方的調整卻是有效而且立即可見。一般來說設計網頁是要把結構跟樣式分開，因此建議採第一種方式，也就是在 HTML 文件之外寫樣式表檔案，然後再以 HTML 文件載入。
我們在這份《CSS 2.1 快速導覽》中，全部以第一種方式，額外的 .css 檔案作為示範。
| 中英文術語對照 | |
|---|---|
| 樣式表 | style sheet |
| 標籤 | tag |
| 規則 | rule |
| 元素 | element |
| 屬性 | attribute |
| 瀏覽器 | browser |
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/intro.html
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