"Asm.js is a clear step towards enabling near-native performance for the Web platform, which is why we're excited to bring it to Chakra in an upcoming release," said Guareth Seth and Ed Maurer, of the Chakra team, in the blog post. The headline of the post mentions inclusion of asm.js in Chakra in Windows 10, which is due some time this year.
Asm.js can be used as a target language for compilers and has been positioned to improve Web application performance and extend C and C++ applications to the Web. Microsoft has been working with the Firefox team handling asm.js. to help bring the technology to Chakra. Asm.js, the bloggers said, is leveraged principally by transpiling C/C++ code to run on the Web platform, utilizing technologies like WebGL.