Why is Microsoft contributing to WebKit? - ZDnet
No, Microsoft isn't planning to dump IE, Chakra and the Trident rendering engine in favour of the otherwise ubiquitous WebKit rendering engine. What it's trying to do is get developers who optimise their mobile websites for Safari and WebKit to start using the HTML5 standards without vendor prefixes, so that IE10 users on Windows RT and Windows Phone get the same experience as iPhone and Android users, not a fallback site that tells you how awful IE is and how you should get a real browser instead.