I have the following mixin for cross-browser transform:
.transform (...) {
-webkit-transform: @arguments; /* Chrome, Opera 15+, Safari 3.1+ */
-mo
There are a few you can use, the ones suggested from modenizer are:
css sandpaper and transformie.
I'd argue though, that adding pollyfills to older browser like ie8 damages the performance of an already past it browser and lowers the user experience. Also, if you are adding pollyfills to mobile browsers you are adding to the loading times which in a 3g connection might put users off.