For CSS layout, refer to the IF condition annotation of IE to use memo.
<! -- [If! IE]> <! --> All except Ie can be recognized <! -- <! [Endif] -->
<! -- [If IE]> all IE identifiable <! [Endif] -->
<! -- [If IE 5.0]> only ie5.0 can recognize <! [Endif] -->
<! -- [If IE 5]> only ie5.0 and ie5.5 can be recognized <! [Endif] -->
<! -- [If gt ie 5.0]> both ie5.0 and ie5.0 can be recognized <! [Endif] -->
<! -- [If IE 6]> only IE6 can recognize <! [Endif] -->
<! -- [If lt IE 6]> versions earlier than IE6 and IE6 are recognizable <! [Endif] -->
<! -- [If gte ie 6]> IE6 and IE6 and later versions can be recognized <! [Endif] -->
<! -- [If IE 7]> only IE7 is recognizable <! [Endif] -->
<! -- [If lt IE 7]> versions earlier than IE7 and IE7 are recognizable <! [Endif] -->
<! -- [If gte ie 7]> IE7 and IE7 versions can be identified <! [Endif] -->
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