It is a question of when viewed in Web browser.

What exactly are you trying to do? Could you post the html script?
You can only set the z-index for div tags that have a position of "fixed" or "absolute".. I tried it out and it's working fine in my web browser. Here's an image of the top of the web page (the blue is the web player and the grey bar across is a div)

Thanks for the reply.

It looks like you can.

Either way I have the wrong?

The 3.5.7 version of Unity

For example,

 <style type="text/css">

Add the following in the

 div#unityPlayer {
     z-index:1;
     height: 600px;
     width: 960px;
 }
 div#hoge{
     position:absolute;
     z-index:2;
     top:5px;
     left:100px;
     padding:10px;
     width:300px;
     color:#00f;
 }

I tried to display the following div.

 <div id="hoge">
     <p>HT$$anonymous$$L test</p>
     <img src="img.png" />
 </div>

"hoge" will be shown on the back

Hm thats strange which browser are you using?
It's working fine in firefox.. Just to get a better idea of what is happening could you give the #hoge div a background color and perhaps send a screen shot

If i specify the "background", began to appear in the foreground.

Thank you.

 <div id="hoge" style="background-color: rgb(120,200,40);">
     <p>HT$$anonymous$$L test</p>
     <img src="img.png" />
 </div>

must always specify the background?

I work well with firefox. I did not work properly in google chrome.