SVG Rotation in 3D

I found that there really isn't a way in SVG to do a 3D rotation that is supported in any modern browser (to the best of my knowledge). However, CSS3 does have a similar "transform" property.

The following works for me:

<svg version="1.1" 
     xmlns="http://www.w3.org/2000/svg" 
     xmlns:xlink="http://www.w3.org/1999/xlink" width="640px" height="480px">

    <rect x="100" y="100" width="440" height="280" fill="#000000" style="-webkit-transform: rotateX(30); -webkit-transform-origin-y: 580px; -webkit-transform-origin-z: 100"></rect>
</svg>

This, obviously, isn't a good cross-browser solution (as it uses prefixed properties), but that isn't something I need in my application.