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# WebAssembly Proposals Support
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The following table summarizes Wasmtime's support for WebAssembly proposals as
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well as the command line flag and [`wasmtime::Config`][config] method you can
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use to enable or disable support for a proposal.
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If a proposal is not listed, then it is not supported by Wasmtime.
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Wasmtime will never enable a proposal by default unless it has reached phase 4
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of [the WebAssembly standardizations process][phases] and its implementation in
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Wasmtime has been [thoroughly
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vetted](./contributing-implementing-wasm-proposals.html).
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| WebAssembly Proposal | Supported in Wasmtime? | Command Line Name | [`Config`][config] Method |
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|---------------------------------------------|----------------------------------|--------------------|---------------------------|
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| **[Import and Export Mutable Globals]** | **Yes.**<br/>Always enabled. | (none) | (none) |
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| **[Sign-Extension Operations]** | **Yes.**<br/>Always enabled. | (none) | (none) |
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| **[Non-Trapping Float-to-Int Conversions]** | **Yes.**<br/>Always enabled. | (none) | (none) |
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| **[Multi-Value]** | **Yes.**<br/>Enabled by default. | `multi-value` | [`wasm_multi_value`](https://docs.rs/wasmtime/*/wasmtime/struct.Config.html#method.wasm_multi_value) |
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| **[Bulk Memory Operations]** | **Yes.**<br/>Enabled by default. | `bulk-memory` | [`wasm_bulk_memory`](https://docs.rs/wasmtime/*/wasmtime/struct.Config.html#method.wasm_bulk_memory) |
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| **[Reference Types]** | **Yes.**<br/>Enabled by default. | `reference-types` | [`wasm_reference_types`](https://docs.rs/wasmtime/*/wasmtime/struct.Config.html#method.wasm_reference_types) |
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| **[Fixed-Width SIMD]** | **Yes.**<br/>Enabled by default. | `simd` | [`wasm_simd`](https://docs.rs/wasmtime/*/wasmtime/struct.Config.html#method.wasm_simd) |
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| **[Threads and Atomics]** | **In progress.** | `threads` | [`wasm_threads`](https://docs.rs/wasmtime/*/wasmtime/struct.Config.html#method.wasm_threads) |
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| **[Multi-Memory]** | **Yes.** | `multi-memory` | [`wasm_multi_memory`](https://docs.rs/wasmtime/*/wasmtime/struct.Config.html#method.wasm_multi_memory) |
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| **[Component Model]** | **In progress.** | `component-model` | [`wasm_component_model`](https://docs.rs/wasmtime/*/wasmtime/struct.Config.html#method.wasm_component_model) |
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| **[Memory64]** | **Yes.** | `memory64` | [`wasm_memory64`](https://docs.rs/wasmtime/*/wasmtime/struct.Config.html#method.wasm_memory64) |
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The "Command Line Name" refers to the `--wasm-features` CLI argument of the
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`wasmtime` executable and the name which must be passed to enable it.
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[config]: https://docs.rs/wasmtime/*/wasmtime/struct.Config.html
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[Multi-Value]: https://github.com/WebAssembly/spec/blob/master/proposals/multi-value/Overview.md
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[Bulk Memory Operations]: https://github.com/WebAssembly/bulk-memory-operations/blob/master/proposals/bulk-memory-operations/Overview.md
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[Import and Export Mutable Globals]: https://github.com/WebAssembly/mutable-global/blob/master/proposals/mutable-global/Overview.md
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[Reference Types]: https://github.com/WebAssembly/reference-types/blob/master/proposals/reference-types/Overview.md
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[Non-Trapping Float-to-Int Conversions]: https://github.com/WebAssembly/spec/blob/master/proposals/nontrapping-float-to-int-conversion/Overview.md
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[Sign-Extension Operations]: https://github.com/WebAssembly/spec/blob/master/proposals/sign-extension-ops/Overview.md
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[Fixed-Width SIMD]: https://github.com/WebAssembly/simd/blob/master/proposals/simd/SIMD.md
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[phases]: https://github.com/WebAssembly/meetings/blob/master/process/phases.md
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[Threads and Atomics]: https://github.com/WebAssembly/threads/blob/master/proposals/threads/Overview.md
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[Multi-Memory]: https://github.com/WebAssembly/multi-memory/blob/master/proposals/multi-memory/Overview.md
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[Component Model]: https://github.com/WebAssembly/component-model/blob/main/design/mvp/Explainer.md
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[Memory64]: https://github.com/WebAssembly/memory64/blob/master/proposals/memory64/Overview.md
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