There are rumors that Microsoft is limited backward compatibility with the launch of a web developer.
A new browser will not IE 12, but instead will be entirely new: Spartan is a new, easy-Microsoft browser builds.
New web browser from Microsoft decides to compatibility issues for each web site, platforms, and applications on the Internet.
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ethana
I remember the IE panel of this year /BUILD, they said they were considering adopting Webkit for future IE. Even if that wasn't true, time had really changed.----
Scott Lewis
Microsoft’s browser has done an excellent job through a very concerted effort over the last couple of years of becoming browser compliant. But developers have always had the option of building sites any way they want. But if your site doesn’t render well on XYZ browser, you probably won’t change the world, just lose traffic.
Philornithia
No matter what they call it, as long as the new browser uses the trident engine, it'll still be Internet Explorer at heart. While they've worked on getting trident much more caught up to the other engines, it still lags behind and has odd quirks the others don't have, such as not applying fonts to things like textboxes properly.