clear 属性是定义否允许两边可以有浮动对象的一个属性，它有4个值：
none : 允许两边都可以有浮动对象
both : 不允许有浮动对象
left : 不允许左边有浮动对象
right : 不允许右边有浮动对象
Tags: clear, 学习笔记
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