I can\'t seem to find anything on google about this. I know you can pretty much rule out IE. I know webkit supports it but what else do you know?
Ok, this question has been here quite a while, but I wanted to add this anyway. Regarding a question about browser support, a good source is always the caniuse.com website.
In this case, you can find the current, past and expected future support for the range input here: http://caniuse.com/#feat=input-range
At the time of writing, apparently (Desktop) Safari, Chrome and Opera support range
inputs, according to Dive Into HTML5.