我正在管理这个网站：（不是开玩笑）
http://www.orgasmatrix.fr/webcams
如您所见，当您将鼠标放在“类别”上时，菜单会出现在名为“chat_”的 iframe 下方。我已经搜索过了。我已经阅读并测试了“位置：绝对”和“z-index：-999”，但没办法。我发现了另一个使用 iframe embenbed 的技巧，并尝试将“?wmode=transparent”或“?wmode=opaque”作为参数。我也用 , 以及属性 allowtransparency="true" 进行了测试。但没办法，iframe 总是出现在“类别”菜单上方。
有什么帮助吗？我将不胜感激。
The problem isn't with your code, but deeper - in very nested iframe (I have counted 3) with that chat element:
<object type="application/x-shockwave-flash" data="http://img.media-rendering2.com/market2/livecams/chat_coquin/chat_v2.swf" wmode="transparent" width="300" height="405" id="chatCoquinTac" style="visibility: visible; "><param name="menu" value="false"><param name="quality" value="high"><param name="allowScriptAccess" value="always"><param name="wmode" value="transparent"><param name="flashvars" value="url_acces=&url_image=http%3A%2F%2Fimg.media-rendering2.com%2Fmarket2%2Flivecams%2Fchat_coquin%2F&sexe=h&langue=fr&webcam=7&pseudo=Julia&ville=Warsaw&format=2&temps=1338679111"></object>
As you can see I have added (with developer tools) <param name="wmode" value="transparent"> and wmode="transparent" to <object> and it worked as it should (Chrome 19) - your categories menu appears above chat window.