快速测试 。最简单的形式 z-index 在使用 position：fixed; 。

I have a webpage that I need to modify, the background, which is currently absolute positioned with z-index to push it back, needs to stay put when scrolling, i need to change it to fixed, yet doing so seems to break z-index and push the content below it vertically. Any ideas?

edit: OK I managed to get it to work in FF, but IE is still broken...

Made a quick test. In its simplest form z-index doesn't break when using position: fixed;.