interface is often seen in daily development. It was normal to use positioning before. Recently, floating was used to achieve left and right layout. When using clear:both to clear floats, a strange problem was found. The problem is described as follows:
clear:both:
it is abnormal to use clear:both to clear floating elements, which is as high as body content. If you set overflow:hidden to the parent, it will not cause this problem. Ask the bosses of css how to solve this problem
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