Clone this repo:
  1. 7e3c46a [core test] Tests long encoding of a segment index (#892) by Ben Smith · 12 hours ago master
  2. 64bf5c7 Editorial: Note status of memory growth errors by Daniel Ehrenberg · 31 hours ago
  3. f20e40f Update documentation for jsapi tests. by Ms2ger · 2 days ago
  4. cf67a47 Import jsapi tests from WPT. (#883) by Ms2ger · 3 days ago
  5. 423c6f8 [js-api] Introduce a 'create a memory buffer' algorithm. by Ms2ger · 8 days 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.