HTML 标签

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Definition and Usage
用法

The <!DOCTYPE> declaration is the very first thing in your document, before the <html> tag. This tag tells the browser which HTML or XHTML specification the document uses.
<!DOCTYPE>声明是在你文档中的头等事，它在<html>标签之前。这个标签的目的是要让浏览器知道目前它所碰到的文档是HTML还是XHTML，并且用的是哪一个规格的。

HTML

HTML 4.01 specifies three document types: Strict, Transitional, and Frameset.
在HTML4.01中有三种文档类型：严密型，过渡型以及框架型。

HTML Strict DTD

Use this when you want clean markup, free of presentational clutter. Use this together with Cascading Style Sheets (CSS):
当你想要用比较整洁的标记，从混乱的观念里解脱的话可以选择严密型的DTD。结合CSS使用：

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">

HTML Transitional DTD

The Transitional DTD includes presentation attributes and elements that W3C expects to move to a style sheet. Use this when you need to use HTML's presentational features because your readers don't have browsers that support Cascading Style Sheets (CSS):
过渡型DTD包含一些W3C预计会移向样式表中的属性和元素。如果你感觉读者的浏览器不一定会支持CSS的话可以选择这个类型的文档
(目前流行的浏览器都支持CSS，只是大部分CSS2属性还不行)

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

Frameset DTD

The Frameset DTD should be used for documents with frames. The Frameset DTD is equal to the Transitional DTD except for the frameset element replaces the body element:
框架型DTD应该配合带有框架的文档使用。框架DTD基本等同于过渡型除了frameset元素替代了body元素

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Frameset//EN" "http://www.w3.org/TR/html4/frameset.dtd">

XHTML

XHTML 1.0 specifies three XML document types: Strict, Transitional, and Frameset.
指定了三种XML文档类型：严密型，过渡型，以及框架型

XHTML Strict DTD

Use this DTD when you want clean markup, free of presentational clutter. Use this together with Cascading Style Sheets (CSS):
当你想要用比较整洁的标记，从混乱的观念里解脱的话可以选择严密型的DTD。结合CSS使用：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

XHTML Transitional DTD

Use this DTD when you need to use XHTML's presentational features because your readers don't have browsers that support Cascading Style Sheets (CSS):
如果你感觉读者的浏览器不一定会支持CSS的话可以选择这个类型的文档，它可以使用一些不被推荐的标签和属性：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

XHTML Frameset DTD

Use this DTD when you want to use frames!
如果你想用到框架请用这个。

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Frameset//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd">

To check that you have written a valid XHTML document with a correct DTD, you can link your XHTML page to an XHTML validator.
要检查你的页面是否符合DTD的要求，可以用将你的页面连接到相应的校验器上。

Attributes: NONE
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