做DIV+CSS页面，不推荐使用的标签代码，请尽量不要使用这些HTML标签：
Do not use these html elements in html pages.
Presentational elements should not be used.
Support for some elements has been (or will be) deprecated; they should not be used.

Don't Use These Tags

Presentational

b big   
 hr   
 i   
 small   
 sub   
 sup   
 tt   
 Deprecated   
 basefont   
 center   
 dir   
 font   
 isindex   
 menu   

 strike   
 u  

Unsupported and Damaging in Practice
tfoot
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