They are getting there. They already open sourced their js engine [0] and some parts of the rendering engine like the WebGL stuff [1]. I remember reading that

They are getting there. They already open sourced their js engine [0] and some parts of the rendering engine like the WebGL stuff [1]. I remember reading that it's a goal of them that they want to open source it, but it's not an overnight process. [0] https://github.com/Microsoft/ChakraCore https://github.com/Microsoft/ChakraCore [1] https://github.com/MicrosoftEdge/WebGL https://github.com/MicrosoftEdge/WebGL