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问题描述

 <!DOCTYPE html PUBLIC -  // W3C // DTD XHTML 1.0 Transitional // ENhttp://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\"> 
< html xmlns =http://www.w3.org/1999/xhtmlxml:lang =enlang =en>
< head>
< meta http-equiv =Content-Typecontent =text / html; charset = iso-8859-1/>
< title> TEST< / title>
< / head>
< body style =margin:0; padding:0>

< div style =background-color:#eeeeee; margin:auto; height:500px; width:500px>
< div style =position:relative>
< span style =position:absolute; display:block; height:250px; width:250px; background:green; z-layer:2>< br />< br />应该位于顶部< / span>
< / div>
< / div>

< / body>
< / html>


解决方案

索引



绝对跨度也是一个没有z-index的相对div

这里是正确的html:

 < div style =background-color:#eeeeee; margin:auto; height:500px; width:500px > 
< div style =position:relative; z-index:2>
< / div>
< span style =position:relative; display:block; width:500px; background:blue; z-index:1>其实在顶部< / span>
< / div>


It's all in the question but here's a simple example

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
    <meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1" />
    <title>TEST</title>
</head>
<body style="margin:0;padding:0">

<div style="background-color:#eeeeee;margin:auto;height:500px;width:500px">
    <div style="position:relative">
        <span style="position:absolute;display:block;height:250px;width:250px;background:green;z-layer:2"><br /><br />Should be on top</span>
    </div>
    <span style="position:relative;display:block;width:500px;background:blue;z-layer:1">Actually on top</span>
</div>

</body>
</html>
解决方案

instead of "z-layer" use "z-index"

also the absolute span is in a relative div with no z-index

Here is the correct html:

<div style="background-color:#eeeeee;margin:auto;height:500px;width:500px">
    <div style="position:relative;z-index:2">
        <span style="position:absolute;display:block;height:250px;width:250px;background:green"><br /><br />Should be on top</span>
    </div>
    <span style="position:relative;display:block;width:500px;background:blue;z-index:1">Actually on top</span>
</div>

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10-12 14:07