Developer Kevin Gaad, who judging by
his profile works for Mozilla, presented his development - a .NET compiler (C #) code in JavaScript. To demonstrate the performance of the library, Kevin
published a ported example of a demonstration game project based on XNA 3.1.

The game works in browsers IE9 +, Firefox 4+, and Chrome 11. The developer writes that Opera is not supported due to browser problems with ECMAScript5 and Chrome 12 and 13 have bugs that interfere with normal operation.
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An open source compiler project is available on
GitHub . The developer made announcements of his work on
Hacker News and
Reddit , where you can comment on it. In addition, a demo project with the game is available here:
Platformer.zip .
Looks impressive.