css attributes relative positioning, absolute positioning, fixed positioning

This article mainly introduces the relative positioning, absolute positioning and fixed positioning of css attributes. It has a certain reference value. Now I share it with you. Friends in need can refer to it

Positioning

1. 相对定位(position:relative)
    即相对于自己原先的位置定位,当盒子移动之后,原先的位置依然在存在
2. 绝对定位(position:absolute)
    默认是以body为基准定位,如果父级设置为相对定位之后,子元素的绝对定位就会以父级为起点.    定位之后能够设置框高
3.  固定定位(position:fixed)
    即相对于游览器定位,永远固定在用户的可视范围内
4. 定位方向冲突
    水平冲突(即left和right都设置),先执行left的设定
        垂直冲突,值执行top的设定.

       

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