1. XHTML elements must be correctly nested
2. The XHTML element must be disabled, and empty labels must also be disabled. For example, <br/>
3. The XHTML element must be in lowercase.
4. The XHTML document must have a root element.
5. The XHTML attribute name must be in lower case, and the attribute value must be enclosed in quotation marks. The attribute name cannot be abbreviated. For example: <input checked = "checked"/>
6. XHTML uses the id attribute instead of the name attribute.
Note: You should add an extra space before the "/" symbol to make your XHTML compatible with today's browsers.
7. The lang attribute is applied to almost all XHTML elements. It defines the type of language used for the content inside the element. If you use the lang attribute in an element, you must add an extra xml: lang, as shown in the following code: <divlang="no" xml:lang="no"> Heia Norge! </Div>
XHTML 1.0 specifies three types of XML documents to correspond to the above three DTD types.
XHTML 1.0 Strict<!DOCTYPE htmlPUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
In this case, a clean mark is required to avoid confusion. Use it with the stacked style sheet.
XHTML 1.0 Transitional<!DOCTYPE htmlPUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
In this case: When you need to use HTML's performance features, and you need to write XHTML for browsers that do not support stacked style sheets.
XHTML 1.0 Frameset<!DOCTYPE htmlPUBLIC "-//W3C//DTD XHTML 1.0 Frameset//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd">
In this case, you need to use the HTML framework to split the browser window into two or more frames.
Http://www.cnblogs.com/kuyijie/archive/2011/01/06/1927663.html
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