The Nokia Lumia 800 runs Windows 7.5 Mango OS. And this OS in turn has the HTML5 browser. It's a pretty slick browser and it even features graphics acceleration. It integrates Bing search, can find text from images and translate it to any language you want. The UI also seems to be pretty fast and smooth. Check out the video to see for yourself. Read more about the Nokia Lumia 800 here.