CSS布局定位:position_html/css_WEB-ITnose
position:属性规定元素的定位类型。
取值:static | absolute | fixed | relative
static : 默认值。无特殊定位 。对象遵循HTML定位规则。
absolute(绝对定位) : 将对象从文档流中拖出(可层叠)。用left, right, top, bottom等属性相对于其最接近的一个最有定位设置的父对象进行绝对定位。如果不存在这样的父对象,则依照body对象绝对定位。
fixed(固定定位,一种特殊的绝对定位) :相对于浏览器窗口。可以根据left, right, top, bottom等属性进行定位。遵从绝对定位方式。
relative(相对定位) : 对象不层叠。可以根据left, right, top, bottom等属性在正常文档流中进行定位。

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