css網頁布局中不推薦使用的html標簽，請盡量不要使用這些html標簽。

　　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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