我故意搞错，导致div footer无法显示，我不明白为什么会有这种效果，请解答
nbsp;html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
回复讨论(解决方案)
什么效果，你指的是footer的背景没显示出来吗？原因是加float后宽度变为0
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