在实际开发页面布局时，运用position，对定位的块级元素的嵌套的效果总是不太理解，这里做了几个测试
一般的在w3c中我们可以很容易的获取定义:
static ： 默认值。没有定位，元素出现在正常的流中（忽略 top, bottom, left, right 或者 z-index 声明）。
fixed ：生成绝对定位的元素，相对于浏览器窗口进行定位。元素的位置通过 "left", "top", "right" 以及 "bottom" 属性进行规定。
inherit ：规定应该从父元素继承 position 属性的值。
absolute : 生成绝对定位的元素，相对于 static 定位以外的第一个父元素进行定位。元素的位置通过 "left", "top", "right" 以及 "bottom" 属性进行规定。
relative : 生成相对定位的元素，相对于其正常位置进行定位。因此，"left:20" 会向元素的 LEFT 位置添加 20 像素。
总的来说 ：
static呢，就是正常的文档流顺序，默认的，相当于没有定位!
fixed呢， 就是相对于浏览器窗口，就是你滚动条怎么滚动，他还是那个位置，就想是 “粘” 在窗口上了!
inherit呢， 就是从父元素继承 position 属性的值，
absolute呢，是脱离文档流的原来的位置是不继续占据了，如果他的父级元素中有已经定位了的不管是absolute的还是relative，它都会相对于他的父级元素来定位，如果他的父级元素中没有定位了的那么它就是相对于body来定位的。也就是说absolute的绝对是有参照物的！
relative呢，是不会脱离文档流的原来的位置也就继续占据了，它是只相对于自身原来的位置来定位的!
前三个是很容易理解的，对于absolute和relative的结合使用，做了几个测试
测试（absolute和relative）
1.单独的absolute和relative
2.relative中的relative，absolute中的relative
3.absolute中的absolute，relative中的absolute
<!DOCTYPE html><html><head> <title>position -- absolute -- relative</title></head><style> .test-a{ position: absolute; top:20px; left:60px; width:200px; height: 100px; background: red; } .test{ width:400px; height: 100px; background: green; } .test-r{ position:relative; top:50px; left:130px; background: yellow; width:160px; height: 180px; } .test-rr{ position: relative; top: 20px; left: 100px; width: 600px; height: 300px; background: blue; } .test-aa{ position: absolute; top: 24px; left: 34px; background: orange; } .test-aaa{ position: absolute; top: 24px; left: 34px; width:400px; height:200px; background: #18E457; } .test-aaaa{ position: absolute; top: 124px; left: 134px; width:400px; height:200px; background: yellow; } .test-rrr{ position: relative; top: 24px; left: 34px; width:400px; height:200px; background: yellow; } .test-rrr{ position: relative; top: 124px; left: 134px; width:400px; height:200px; background: red; } .test-r-a{ position: absolute; top: 124px; left: 134px; width:800px; height:800px; background: yellow; } .test-a-r{ position: relative; top: 124px; left: 134px; width:700px; height:700px; background: red; }</style><body> <div class="test-a">absolute</div> <div class="test">分割</div> <div class="test-r">relative</div> <h2 id="结合使用">结合使用</h2> <p>parentNode的position不是relative或absolute,那absolute的绝对对象是针对body的 parentNode的position 是relative或absolute,那absolute的绝对对象是针对parentNode的 也就是说absolute的绝对是有参照Node的 </p> <div class="test-rr"> absolute外的relative <div class="test-aa"> relative内的absolute，，，里面这个div是相对外面那个div定位的 </div> </div> <div class="test-aaa"> absolute外的absolute <div class="test-aaaa"> absolute内的absolute,,,,,,,,里面这个div是相对外面那个div定位的 </div> </div> <div class="test-rrr" > relative外的relative <div class="test-rrrr"> relative内的relative,,,,,,,,里面这个div是相对原来位置定位的 </div> </div> <div class="test-r-a"> relative外的absolute <div class="test"> <div class="test-a-r"> relative内的absolute，，，里面这个div是相对原来位置定位的 </div> </div> </div></body></html> 其实很多时候，网上的经验，很多很杂，自己实践一下，才能自己真正理解
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