WebAssembly proposals

• Finished Proposals
• Inactive Proposals

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
Type Reflection for WebAssembly JavaScript API	Ilya Rezvov
ESM Integration	Asumu Takikawa, Ms2ger & Guy Bedford
Wide Arithmetic	Alex Crichton and Jamey Sharp

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	Ashley Nelson
Custom Page Sizes	Nick Fitzgerald
Stack Switching	Francis McCabe & Sam Lindley
Rounding Variants	Kloud Koder
Compilation Hints	Emanuel Ziegler
Custom Descriptors and JS Interop	Thomas Lively

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
Compact Import Section	Ryan Hunt
JS Primitive Builtins	Sébastien Doeraene

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.