Clone this repo:
  1. 068147e [spec] Fix sqrt(-0) (#1227) by Andreas Rossberg · 9 days ago master
  2. 6d43a25 Properly handle i32.trunc_f64_s of -2147483648.x (#1225) by Alon Zakai · 13 days ago
  3. ce2fcfd Add more i32.trunc_f64_s conversion checks (#1223) by Alon Zakai · 2 weeks ago
  4. bd511b2 ~ modernize media type registration by Eric Prud'hommeaux · 3 weeks ago
  5. acdb0ac Add merlin config file (#1216) by Ng Zhi An · 5 weeks ago

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This repository holds the sources for the WebAssembly draft specification (to seed a future WebAssembly Working Group), a reference implementation, and the official testsuite.

A formatted version of the spec is available here:,

Participation is welcome. Discussions about new features, significant semantic changes, or any specification change likely to generate substantial discussion should take place in the WebAssembly design repository first, so that this spec repository can remain focused. And please follow the guidelines for contributing.


For citing WebAssembly in LaTeX, use this bibtex file.