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‎src/.vuepress/components/Wt.vue‎

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<template>
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<img class="engine" src="/images/wasmtime.svg" width="18" height="18" title="Wasmtime" />
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<img class="engine" src="/images/noimage.png" width="18" height="18" title="Wasmtime" />
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</template>

‎src/.vuepress/public/images/noimage.png‎

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‎src/.vuepress/public/images/wasmtime.svg‎

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‎src/status.md‎

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## WebAssembly features
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Some crucial language features rely on [future WebAssembly functionality](https://github.com/WebAssembly/proposals) to be efficient. The following table aims to give an overview from a WebAssembly perspective:
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Some language features rely on [future WebAssembly functionality](https://github.com/WebAssembly/proposals) to become viable. The following table aims to give an overview from a WebAssembly perspective:
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| WebAssembly spec | Engines | AssemblyScript (flag) | Perspective
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|-----------------------------------------|-------------------------------------|-------------------------|------------------------------------
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| WebAssembly spec | Engines | AssemblyScript (flag) | Perspective
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|-----------------------------------------|---------------------------------------|-------------------------|------------------------------------
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| ✔️ **Finished proposal**
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| [Import/export of mutable globals] | <Ch/> <Fi/> <Sa/> <No/> <Wt/> <Ws/> | ✔️ | <Badge text="good" type="tip"/> Interop
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| [JS BigInt integration]<sup>1</sup> | <Ch/> <Fi/> <Sa/> <No/> <Wt/> <Ws/> | ✔️ | <Badge text="good" type="tip"/> Interop
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| [Sign-extension operations] | <Ch/> <Fi/> <Sa/> <No/> <Wt/> <Ws/> | ✔️ | <Badge text="good" type="tip"/> Efficiency
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| [Non-trapping float-to-int conversions] | <Ch/> <Fi/> <Sa/> <No/> <Wt/> <Ws/> | ✔️ | <Badge text="good" type="tip"/> Efficiency
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| [Bulk memory operations] | <Ch/> <Fi/> <Sa/> <No/> <Wt/> <Ws/> | ✔️ | <Badge text="good" type="tip"/> Efficiency
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| [Fixed-width SIMD] | <Ch/> <Fi/> <Sa/> <No/> <Wt/> <Ws/> | 🏁 `simd` | <Badge text="good" type="tip"/> Feature
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| [Reference types] | <Ch/> <Fi/> <Sa/> <No/> <Wt/> <Ws/> | 🔨 `reference-types` | <Badge text="good" type="tip"/> Interop
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| [Multi-value] | <Ch/> <Fi/> <Sa/> <No/> <Wt/> <Ws/> | | <Badge text="good" type="tip"/> Feature
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| [Import/export of mutable globals] | <Ch/> <Fi/> <Sa/> <No/> ⁞ <Ws/> <Wt/> | ✔️ | <Badge text="good" type="tip"/> Interop
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| [JS BigInt integration]<sup>1</sup> | <Ch/> <Fi/> <Sa/> <No/> | ✔️ | <Badge text="good" type="tip"/> Interop
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| [Sign-extension operations] | <Ch/> <Fi/> <Sa/> <No/> ⁞ <Ws/> <Wt/> | ✔️ | <Badge text="good" type="tip"/> Efficiency
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| [Non-trapping float-to-int conversions] | <Ch/> <Fi/> <Sa/> <No/> ⁞ <Ws/> <Wt/> | ✔️ | <Badge text="good" type="tip"/> Efficiency
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| [Bulk memory operations] | <Ch/> <Fi/> <Sa/> <No/> ⁞ <Ws/> <Wt/> | ✔️ | <Badge text="good" type="tip"/> Efficiency
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| [Fixed-width SIMD] | <Ch/> <Fi/> <Sa/> <No/> ⁞ <Ws/> <Wt/> | 🏁 `simd` | <Badge text="good" type="tip"/> Feature
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| [Reference types] | <Ch/> <Fi/> <Sa/> <No/> ⁞ <Ws/> <Wt/> | 🔨 `reference-types` | <Badge text="good" type="tip"/> Interop
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| [Multi-value] | <Ch/> <Fi/> <Sa/> <No/> ⁞ <Ws/> <Wt/> | | <Badge text="good" type="tip"/> Feature
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| 🏁 **Standardize the feature**
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| [Extended constant expressions] | | 🔨 | <Badge text="good" type="tip"/> Efficiency
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| [Tail call] | | | <Badge text="good" type="tip"/> Efficiency
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| [Extended constant expressions] | | 🔨 | <Badge text="good" type="tip"/> Efficiency
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| [Tail call] | | | <Badge text="good" type="tip"/> Efficiency
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| 🔨 **Implementation phase**
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| [Relaxed SIMD] | | 🏁 `relaxed-simd` | <Badge text="good" type="tip"/> Feature
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| [Exception handling] | <Ch/> <Fi/> <Sa/> <No/> <Xx/> <Xx/> | 🔨 `exception-handling` | <Badge text="good" type="tip"/> Feature
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| [Typed function references] | | 🔨 `gc` | <Badge text="good" type="tip"/> Feature
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| [Garbage collection] | | 🔨 `gc` | <Badge text="good" type="tip"/> Efficiency / Interop
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| [Multiple memories] | | 🔨 | <Badge text="good" type="tip"/> Feature
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| [Branch hinting] | | | <Badge text="good" type="tip"/> Efficiency
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| [JS Promise integration] | | | <Badge text="uncertain" type="warning"/>
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| [Threads] | <Ch/> <Fi/> <Sa/> <No/> <Xx/> <Xx/> | 🔨 `threads` | <Badge text="uncertain" type="warning"/>
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| [Memory64] | | 🔨 | <Badge text="uncertain" type="warning"/>
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| [Relaxed SIMD] | | 🏁 `relaxed-simd` | <Badge text="good" type="tip"/> Feature
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| [Exception handling] | <Ch/> <Fi/> <Sa/> <No/> | 🔨 `exception-handling` | <Badge text="good" type="tip"/> Feature
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| [Typed function references] | | 🔨 `gc` | <Badge text="good" type="tip"/> Feature
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| [Garbage collection] | | 🔨 `gc` | <Badge text="good" type="tip"/> Efficiency / Interop
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| [Multiple memories] | | 🔨 | <Badge text="good" type="tip"/> Feature
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| [Branch hinting] | | | <Badge text="good" type="tip"/> Efficiency
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| [JS Promise integration] | | | <Badge text="uncertain" type="warning"/>
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| [Threads] | <Ch/> <Fi/> <Sa/> <No/> | 🔨 `threads` | <Badge text="uncertain" type="warning"/>
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| [Memory64] | | 🔨 | <Badge text="uncertain" type="warning"/>
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| 📖 **Spec text available**
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| [ECMAScript module integration] | | | <Badge text="good" type="tip"/> Interop
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| [Instrument and tracing] | | | <Badge text="good" type="tip"/> Debugging
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| [ECMAScript module integration] | | | <Badge text="good" type="tip"/> Interop
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| [Instrument and tracing] | | | <Badge text="good" type="tip"/> Debugging
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| 💡 **Feature proposal**
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| [Reference-typed strings] | | 🔨 `stringref` | <Badge text="good" type="tip"/> Interop
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| [Extended name section] | | 🔨 | <Badge text="good" type="tip"/> Debugging
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| [JS customization for GC] | | | <Badge text="good" type="tip"/> Interop
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| [Type imports] | | | <Badge text="good" type="tip"/> Interop
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| [Flexible vectors] | | | <Badge text="good" type="tip"/> Feature
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| [Constant time] | | | <Badge text="good" type="tip"/> Security
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| [Stack switching] | | | <Badge text="uncertain" type="warning"/>
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| [Call tags] | | | <Badge text="uncertain" type="warning"/>
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| [Memory control] | | | <Badge text="uncertain" type="warning"/>
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| [Profiles] | | | <Badge text="uncertain" type="warning"/>
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| [Component model]<sup>2</sup> | | | <Badge text="harmful" type="error"/>
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| [Reference-typed strings] | | 🔨 `stringref` | <Badge text="good" type="tip"/> Interop
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| [Extended name section] | | 🔨 | <Badge text="good" type="tip"/> Debugging
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| [JS customization for GC] | | | <Badge text="good" type="tip"/> Interop
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| [Type imports] | | | <Badge text="good" type="tip"/> Interop
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| [Flexible vectors] | | | <Badge text="good" type="tip"/> Feature
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| [Constant time] | | | <Badge text="good" type="tip"/> Security
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| [Stack switching] | | | <Badge text="uncertain" type="warning"/>
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| [Call tags] | | | <Badge text="uncertain" type="warning"/>
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| [Memory control] | | | <Badge text="uncertain" type="warning"/>
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| [Profiles] | | | <Badge text="uncertain" type="warning"/>
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| [Component model]<sup>2</sup> | | | <Badge text="harmful" type="error"/>
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| ❔ **Quasi proposal**
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| [WASI]<sup>2</sup> | <Xx/> <Xx/> <Xx/> <Xx/> <Wt/> <Ws/> | | <Badge text="harmful" type="error"/>
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| [WASI]<sup>2</sup> | <Xx/> <Xx/> <Xx/> <Xx/> ⁞ <Ws/> <Wt/> | | <Badge text="harmful" type="error"/>
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Web: &nbsp;
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<Ch/> <a href="https://www.chromestatus.com/features#webassembly" target="_blank" rel="noopener">Chrome</a> &nbsp;
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<Fi/> <a href="https://platform-status.mozilla.org" target="_blank" rel="noopener">Firefox</a> &nbsp;
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<Sa/> <a href="https://webkit.org/status/" target="_blank" rel="noopener">Safari</a> &nbsp;
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<No/> <a href="https://github.com/nodejs/node/blob/master/CHANGELOG.md" target="_blank" rel="noopener">Node.js</a> &nbsp;
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<No/> <a href="https://github.com/nodejs/node/blob/master/CHANGELOG.md" target="_blank" rel="noopener">Node.js</a> &nbsp; ⁞ &nbsp;
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Non-Web: &nbsp;
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<Ws/> <a href="https://docs.wasmer.io/ecosystem/wasmer/wasmer-features#support-of-features-by-compiler" target="_blank" rel="noopener">Wasmer</a> &nbsp;
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<Wt/> <a href="https://docs.wasmtime.dev/stability-wasm-proposals-support.html" target="_blank" rel="noopener">Wasmtime</a> &nbsp;
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<Ws/> <a href="https://docs.wasmer.io/ecosystem/wasmer/wasmer-features#support-of-features-by-compiler" target="_blank" rel="noopener">Wasmer</a> &nbsp; (<sup>1</sup> native support in non-JS hosts)
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<sup>2</sup> See our detailed [standards objections](./standards-objections.md) regarding WASI and the Component Model.<br />
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<sup>1</sup> Supported otherwise by Non-Web hosts. &nbsp; <sup>2</sup> See our detailed [standards objections](./standards-objections.md).
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| Perspective | Description
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|--------------------------------------|-------------

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