CSS网页布局中不推荐使用的HTML标签，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
s
strike
u
Unsupported and Damaging in Practice
tfoot
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