Clone this repo:
  1. 36d993c [test] Functions sharing same implementation (#1289) by Anthony Drendel · 3 days ago master
  2. 7ac5246 [test] Test cases with imports the same name as exports (#1291) by Alex Beregszaszi · 5 days ago
  3. 49c868e Add global_i64 to js harness (#1290) by Ng Zhi An · 5 days ago
  4. ce89050 [test] Globals initialized by other (imported) globals (#1288) by Sam Clegg · 2 weeks ago
  5. a2196ec [interpreter] Make popcnt loop up to bitwidth by Ng Zhi An · 4 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.