[WebAssembly][webassembly_specification] proposals
April 24, 2026 · View on GitHub
Active proposals
Proposals follow this process document.
Phase 5 - The Feature is Standardized (WG)
These proposals have not yet been merged to the spec. Merged proposals are listed in Finished Proposals.
| Proposal | Champion |
|---|
Phase 4 - Standardize the Feature (WG)
| Proposal | Champion |
|---|---|
| Threads | Conrad Watt |
| JS Promise Integration | Francis McCabe |
| Web Content Security Policy | Francis McCabe |
Phase 3 - Implementation Phase (CG + WG)
| Proposal | Champion |
|---|---|
| ESM Integration | Asumu Takikawa, Ms2ger & Guy Bedford |
| Wide Arithmetic | Alex Crichton and Jamey Sharp |
| Stack Switching | Francis McCabe & Sam Lindley |
| Compact Import Section | Ryan Hunt |
| Custom Page Sizes | Nick Fitzgerald |
| Custom Descriptors and JS Interop | Thomas Lively |
Phase 2 - Proposed Spec Text Available (CG + WG)
| Proposal | Champion |
|---|---|
| Relaxed dead code validation | Conrad Watt and Ross Tate |
| Numeric Values in WAT Data Segments | Ezzat Chamudi |
| Extended Name Section | Ben Visness |
| Rounding Variants | Kloud Koder |
| Compilation Hints | Emanuel Ziegler |
| JS Primitive Builtins | Sébastien Doeraene |
Phase 1 - Feature Proposal (CG)
| Proposal | Champion |
|---|---|
| Type Imports | Andreas Rossberg |
| Component Model | Luke Wagner |
| WebAssembly C and C++ API | Andreas Rossberg |
| Flexible Vectors | Petr Penzin & Tal Garfinkel |
| Memory control | Deepti Gandluri & Ben Visness |
| Reference-Typed Strings | Andy Wingo |
| Profiles | Andreas Rossberg |
| Shared-Everything Threads | Andrew Brown, Conrad Watt, and Thomas Lively |
| Frozen Values | Léo Andrès and Pierre Chambart |
| Half Precision | Ilya Rezvov |
| More Array Constructors | Nick Fitzgerald |
| JIT Interface | Ben Titzer |
| Multibyte Array Access | Brendan Dahl |
| Type Reflection for WebAssembly JavaScript API | Ilya Rezvov |
| JS Text Encoding Builtins | Daxpedda |
Phase 0 - Pre-Proposal (CG)
Phase 0 proposals are tracked in the design repository issue tracker.
Implementation status
Implementation status of most proposals in various wasm engines is available on https://webassembly.org/features/
Contributing new proposals
Please see Contributing to WebAssembly for the most up-to-date information on contributing proposals to standard.