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 Tail call Andreas Rossberg Extended Constant Expressions Sam Clegg Typed Function References Andreas Rossberg Garbage collection Andreas Rossberg Multiple memories Andreas Rossberg Relaxed SIMD Marat Dukhan & Zhi An Ng Custom Annotation Syntax in the Text Format Andreas Rossberg Branch Hinting Yuri Iozzelli Exception handling Heejin Ahn & Ben Titzer JS String Builtins Ryan Hunt Memory64 Sam Clegg Phase 4 - Standardize the Feature (WG) Proposal Champion Threads Conrad Watt JS Promise Integration Francis McCabe Phase 3 - Implementation Phase (CG + WG) Proposal Champion Web Content Security Policy Francis McCabe 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 statusImplementation status of most proposals in various wasm engines is available on https://webassembly.org/features/
Contributing new proposalsPlease see Contributing to WebAssembly for the most up-to-date information on contributing proposals to standard.
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