I am sure I'm a minority on this thread - but does anyone else think that if the engine is being developed in the open as open source then competition is not a good thing. I believe it's similar to having io.js and node.js - together it is a stronger platform. To this end, I think it would have made a lot of sense for MS to collaborate with webkit/blink and vice versa... that's the true spirit of open source IMO... I don't believe the web is stronger with more rendering engines and more JS runtimes... I think it's weaker. What would make it stronger is more open source and more collaboration. We have to be very happy that MS is taking the first step in this direction. Open Sourcing ChakraCore is a huge first step and now integrating it with other systems as well . I just hope over the next 10 years we see more collaboration between webkit, blink, gecko, and trident... as well as the JS engines...