IE7/8可以在position:absolute元素前面显示position:relative元素吗？

发布于 2024-09-18 04:25:20 字数 1796 浏览 10 评论 0原文

我在标题区域有一个基于绝对定位的布局和一个基于 CSS 的菜单。在 Firefox 中一切正常，但在 Internet Explorer 7 和 8 中，菜单下拉菜单被内容区域覆盖。在这种情况下，IE 根本不支持 z-index 属性。

我读到了有关堆叠上下文和 z-index bug 的信息，但仍然无法理解去工作。有没有办法修复它而不删除 #content 上的 position:absolute ？不过，我可以更改导航区域使用的定位方法。

这是简化的代码：

<!DOCTYPE html>
<html>
<head>
<style>
#nav {margin:0; padding: 0; position: absolute; left: 0; top: 0; right: 0; height: 2em; background: #eee}
#nav > li {float: left; list-style: none; position: relative; }
#nav > li > a {display: block; position: relative; margin: 0; background-color: #eee; padding: 5px; border: 1px solid #eee; text-decoration: none; color: #444;}
#nav > li:hover > a { background-color: #ddd; }

#nav li ul { z-index: 1; display: none; position: absolute; padding: 0; margin: 0; list-style: none; border: 1px solid black; background: #eee; width: 100px; }
#nav li:hover ul {display: inline;}
#nav li ul li {list-style: none; margin: 0; padding: 0; height: 5em; }
#nav li ul li a {display: block; padding: 5px; margin: 0; color: #444; text-decoration: none; white-space: nowrap;}

#content { position: absolute; top: 3em; left: 0; right: 0; bottom: 0; background: #ccc; }
</style>
</head>
<body>

<ul id="nav">
    <li><a href="#">A</a><ul><li>...</li></ul></li>
    <li><a href="#">Group B</a><ul><li>...</li></ul></li>
    <li><a href="#">The third group</a><ul><li>...</li></ul></li>
</ul>

<div id="content"></div>

</body>
</html>

原文

I have a layout based on absolute positioning and a CSS-based menu in the header area. Everything works fine in Firefox, but in Internet Explorer 7 and 8, the menu dropdowns are covered by the content area. IE simply does not honour the z-index property in this case.

I read about stacking contexts and the z-index bug, but still could not get it to work. Is there some way to fix it without dropping the position:absolute on #content? I can change the positioning method used for the navigation area, though.

Here's the simplified code:

<!DOCTYPE html>
<html>
<head>
<style>
#nav {margin:0; padding: 0; position: absolute; left: 0; top: 0; right: 0; height: 2em; background: #eee}
#nav > li {float: left; list-style: none; position: relative; }
#nav > li > a {display: block; position: relative; margin: 0; background-color: #eee; padding: 5px; border: 1px solid #eee; text-decoration: none; color: #444;}
#nav > li:hover > a { background-color: #ddd; }

#nav li ul { z-index: 1; display: none; position: absolute; padding: 0; margin: 0; list-style: none; border: 1px solid black; background: #eee; width: 100px; }
#nav li:hover ul {display: inline;}
#nav li ul li {list-style: none; margin: 0; padding: 0; height: 5em; }
#nav li ul li a {display: block; padding: 5px; margin: 0; color: #444; text-decoration: none; white-space: nowrap;}

#content { position: absolute; top: 3em; left: 0; right: 0; bottom: 0; background: #ccc; }
</style>
</head>
<body>

<ul id="nav">
    <li><a href="#">A</a><ul><li>...</li></ul></li>
    <li><a href="#">Group B</a><ul><li>...</li></ul></li>
    <li><a href="#">The third group</a><ul><li>...</li></ul></li>
</ul>

<div id="content"></div>

</body>
</html>

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