I have seen experiment who took the code base of Redtamarin (based on AVM2 sources) https://github.com/Corsaair/redtamarin https://github.com/Corsaair/redtamar

I have seen experiment who took the code base of Redtamarin (based on AVM2 sources) https://github.com/Corsaair/redtamarin https://github.com/Corsaair/redtamarin and added native implementations to render UI with OpenGL API, QT API, etc. Now, even if it is technically feasible it is not like providing a plugin for the browsers, so that would be mainly to target desktop GUI apps which Adobe AIR is already doing very well. As for converting the whole Flash API to HTML5/JS, some parts could be done but many parts would be missing or would be impossible to port because the Browser API can not support some of those, TCP/UDP sockets for example (possible with chrome non-standard API but then does not work everywhere).