Clone this repo:
  1. e19508a [spec] Fix copypaste error for V128.Load*_Zero instructions in index (#1662) by Reuben Dunnington · 4 days ago main master
  2. b55d740 [spec] Include reftype in inline element segment abbreviations (#1657) by Tom Stuart · 11 days ago
  3. 933d2dd [interpreter] Tweak parser by Andreas Rossberg · 11 days ago
  4. 083f24c [spec] Fix table_alloc signature (#1658) by Phosra · 11 days ago
  5. 2e8912e Allow test for module size limit to fail (#1653) by Clemens Backes · 4 weeks ago

CI for specs CI for interpreter & tests


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.