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Genius
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#menu:after{ content: "."; display: block; height: 0; clear: both; visibility: hidden; }

I am a beginner of CSS, so I haven't seen this content: "."; before ,what do this mean? this code is in a menu,and I don't know what the exactly meaning ,who can explain it for me ? thanks a million!
^_^

gary.turner
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Tony's clearfix

If your web page is as clever as you can make it, it's probably too clever for you to debug or maintain.

Genius
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thanks for your help. ^_^

thanks for your help.
^_^