See links:
http://www.theregister.co.uk/2015/01/28/spartan_details/
IMHO, relatively unimportant since there are already many good browsers available
and Spartan really offers no earthshaking new functions to the mix.
Thought I would share this here
Actually, we have a problem over at the Windows Insider Program, in that we canโt yet test Spartan along with Windows 10. Been a fair bit of yakking about what that might mean in the long run for the viability of the product. It does strike a few folks as being a bit strange that we canโt yet test it.