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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