Yeah i haven't managed to try it through steam but i get this on the web player.
I got the Matrix Radeon HD 7970 Platinum 3gb
Overclocked.
Jagged Artifacts.
Haven't checked.
I saw a post saying the web player only uses your integrated graphics card.. How true this is, i don't know. I haven't really monitored my GPU. But i imagine its not true.
Ill have a go on steam later and get back to you.
By default unity webplayer used integrated if you have an hybrid gpu system. But you can change it (tested on an Alien ware).
I had the same artifacts temporary with the web version. I have an HD 7970 OC version (stock OC). But sometimes artifacts disappeared after typing grass.on false