主要是体现在代码规范上，XHTML 规范会更加严格
XHTML 元素必须被正确地嵌套
-
正确示范
<b><i>This text is bold and italic</i></b> -
错误示范
<b><i>This text is bold and italic</b></i>
XHTML 元素必须被关闭
-
正确示范
<p>This is a paragraph</p> <p>This is another paragraph</p> A break: <br /> A horizontal rule: <hr /> An image: <img src="happy.gif" alt="Happy face" /> -
错误示范
<p>This is a paragraph <p>This is another paragraph A break: <br> A horizontal rule: <hr> An image: <img src="happy.gif" alt="Happy face">
标签名必须用小写字母
-
正确示范
<body> <p>This is a paragraph</p> </body> -
错误示范
<BODY> <P>This is a paragraph</P> </BODY>
XHTML 文档必须拥有根元素
-
所有的 XHTML 元素必须被嵌套于 根元素中
<html> <head> ... </head> <body> ... </body> </html>
随时随地看视频
