Clone this repo:
  1. 43898ad [spec] Fix off-by-one error in table grow size limit (#1005) by Andreas Rossberg · 3 days ago master wg_v1
  2. c46d4fa [spec] Work around Sphinx/Latex issue (#1004) by Andreas Rossberg · 7 days ago
  3. f20b8e9 [spec] Pre/post-conditions and some renamings in embedding interface (#1003) by Andreas Rossberg · 8 days ago
  4. d14d538 [spec] More precise Unicode terminology (#1002) by Andreas Rossberg · 10 days ago
  5. 4dce956 [test] Alignment and offset with overlong leb128 (#998) by Wanming Lin · 10 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.