| Proposal | Features | |
|---|---|---|
| Phase 5 | ||
| JavaScript BigInt to WebAssembly i64 integration | ✳️ | |
| Bulk memory operations | ✅ | |
| Extended Constant Expressions | extended_const | ✅ |
| Garbage collection | gc | ✅ |
| Multiple memories | multi-memory | ✅ |
| Multi-value | multi_value | ✅ |
| Import/Export of Mutable Globals | ✅ | |
| Reference Types | ✅ | |
| Relaxed SIMD | relaxed_simd | ✅ |
| Non-trapping float-to-int conversions | ✅ | |
| Sign-extension operators | ✅ | |
| Fixed-width SIMD | ✅ | |
| Tail call | tail_call | ✅ |
| Typed Function References | function-references | ✅ |
| Phase 4 | ||
| Exception handling | exceptions | ❌ |
| JS String Builtins | ❌ | |
| Memory64 | memory64 | ❌ |
| Threads | threads | ❌ |
| Phase 3 | ||
| JS Promise Integration | jspi | ✳️ |
| Type Reflection for WebAssembly JavaScript API | type-reflection | 🌐 |
| Legacy Exception Handling | exceptions | ❌ |
| Streaming Compilation | streaming_compilation | 🌐 |