z-index ie6下的解决方案
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<meta name="author" content="Chomo" />
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<title>法则五：非同辈元素，任意一者或其祖元素拥有动态定位时，同时各自向上寻找动态定位的祖元素，并分别从中拿出具备最高级别的祖元素（或其本身）进行比较。</title>
</head>
<style type="text/css">
div { font:12px/1.5 arial;}
div strong { color:#fff; background:#036; display:inline-block;}
h3 strong { color:#f00;}
/*--- 定义方块外形 ---*/
.div1,
.div2 {
height:70px;
width:150px;
background:#cff;
border:1px solid #036;
}
.grandDiv1,
.grandDiv2 {
padding:10px;
border:1px solid #060;
width:174px;
background:#cf9;
}
.parentDiv1,
.parentDiv2 {
padding:10px;
border:1px solid #f06;
width:152px;
background:#fcf;
}
/*--- 定义方块偏移位置、文字位置 ---*/
.grandDiv2 {
margin-top:-50px;
margin-left:95px;
}
.parentDiv2 {
margin-top:-40px;
margin-left:85px;
}
.div2 {
margin-top:-20px;
margin-left:75px;
padding-top:30px;
height:40px;
}
.grandDiv2 .parentDiv2,
.grandDiv2 .div2,
.parentDiv2 .div2 { margin:0;}
</style>
<body>
<h3>法则五<strong>（重要）</strong>：非同辈元素，任意一者或其祖元素拥有动态定位时，同时各自向上寻找动态定位的祖元素至共有的祖元素的下一级为止，并分别从中拿出具备最高级别的祖元素（或其本身）进行比较。</h3>
<p>情况1：子元素的z-index无论多大，父元素大者居上。<p>
<div class="parentDiv1" style="position:relative; z-index:2;">
.parentDiv1{position:relative;<strong>z-index:2</strong>}
<div class="div1">.div1{position:static}</div>
</div>
<div class="parentDiv2" style="position:relative; z-index:1;">
<div class="div2" style="position:relative; z-index:10000;">.div2{position:relative;<strong>z-index:10000</strong>}</div>
.parentDiv2{position:relative;<strong>z-index:1</strong>}
</div>
<p>情况2：父元素居下，子元素也可以居上。<p>
<div class="parentDiv1">
.parentDiv1{position:staitc}
<div class="div1" style="position:relative;">.div1{position:relative}</div>
</div>
<div class="parentDiv2">
<div class="div2">.div2{position:staitc}</div>
.parentDiv2{position:staitc}
</div>
<p>情况1、情况2结合扩展比较。<p>
<div class="grandDiv1" style="position:relative; z-index:3;">
.grandDiv1{position:relative;<strong>z-index:3</strong>}
<div class="parentDiv1">
.parentDiv1{position:staitc}
<div class="div1" style="position:relative; z-index:10000;">.div1{position:relative;<strong>z-index:10000</strong>}</div>
</div>
</div>
<div class="grandDiv2">
<div class="parentDiv2" style="position:relative; z-index:4;">
<div class="div2">.div2{position:staitc}</div>
.parentDiv2{position:relative;<strong>z-index:4</strong>}
</div>
.grandDiv2{position:static;}
</div>
</body>
</html>
