June 2014
Intermediate to advanced
488 pages
9h 56m
Chinese
Content preview from MOBILE HTML5學習手冊
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升級為 HTML5
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39
使用最符合語義的元素
在 XHTML 中，你必須按照語義來編寫元素，段落裡面不能有表格與表單。如果你
要把表單元素當成詞彙元素，必須把它放在語義為區塊等級的元素裡面，例如段落
或表格的儲存格。是的，你可以在網頁中使用
span
與
div
來容納所有東西，但如果
你的 header 是標題，請使用
<h1-6>
標籤。
必要的元件
元素是構成 Web 的磚塊。如果網站沒有內容，CSS 與 JavaScript 就沒有增強效果的對
象。但是實際上，一個合法的 XHTML 只要五個元件：
• 文字類型宣告，或 DTD
• HTML 根元素：
<html></html>
• 文件標頭，
html: <head></head>
的直系子元素
• 文件標題，位於
head: <title></title>
之中
• 文件本文，
html: <body></body>
的直系子元素
換句話說，如果使用 XHTML 語法，最簡單的合法 HTML5 文件會是：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"/>
<title>Blank Document</title>
</head>
<body>
</body>
</html>
我在上面加入
charset <meta>
元素，如果你的伺服器設定了正確的 HTTP 標題的話，就
不一定要使用它。如果你無法控制伺服器，一定要使用它。
事實上，HTML5 的合法文件甚至不需要這麼多元素。如果你省略
<html>
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.