The default value for z-index is auto. : z index « CSS « HTML / CSS






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  2. CSS
  3. z index

The default value for z-index is auto.

  

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<style type="text/css">
* .stacking-context1 {
  position: absolute;
  left: 10px;
  top: 70px;
  background: red;
}

* .stacking-context2 {
  position: absolute;
  left: 223px;
  top: 120px;
  background: gold;
}

* .level2 {
  position: absolute;
  background: blue;
}

* .level3 {
  position: static;
  background: yellow;
}

* .level4 {
  float: left;
  background: black;
}

* .level5 {
  position: static;
  background: pink;
}

* .level6 {
  position: relative;
  background: gray;
}

* .level7 {
  position: absolute;
  background: gold;
}
</style>
</head>

<body>
<div class="stacking-context1 box"> 
<div class="caption"> Background and Borders of Stacking Context #1 <code>z-index:2</code></div> 
<span class="level2 box">Absolute <code>z-index:-999</code></span> 
<div class="level3 box">Static Block<br /> 
<span class="level4 box">Static Float</span> 
<span class="level5 box">Static Span</span><br /><p class="clear"></p> 
<span class="level6 box">Relative Span <code>z-index:0</code></span> 
<span class="level7 box">Absolute <code>z-index:999</code></span> 
</div> 
</div> 
<div class="stacking-context2 box">this is a test. this is a test. </div> 
</body>
</html>








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10.opacity and z-index
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16.Set z-index to 100
17.z index, child index
18.Larger values move them closer to the user in the stacking order.
19.Stacking with z-index
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21.three layers of div tags
22.z-index and sibling selector
23.z-index and child selector