Jekyll2026-05-24T01:11:00+00:00https://rixx.github.io/baseline-updates/feed/by_tag/webassembly.xmlBaseline UpdatesUpdates to the Baseline collection. Including RSS feeds (both for all updates and individual tags).New in Low Baseline Support: Branch hinting (WebAssembly)2026-02-24T00:00:00+00:002026-02-24T00:00:00+00:00https://rixx.github.io/baseline-updates/2026/02/24/wasm-branch-hintingcaniuse · mdn · spec

Branch hints in WebAssembly allows a browser to optimize performance when a branch is a likely to take a specific path.

Source features

  • webassembly.branch-hinting [mdn]
]]>New in High Baseline Support: Fixed-width SIMD (WebAssembly)2025-09-27T00:00:00+00:002025-09-27T00:00:00+00:00https://rixx.github.io/baseline-updates/2025/09/27/wasm-simdcaniuse · mdn · spec

128-bit SIMD (Single Instruction Multiple Data) performs one instruction on multiple units of data, when running on hardware that supports such instructions. Also known as vector instructions.

Source features

  • webassembly.fixed-width-SIMD [mdn]
]]>New in Low Baseline Support: Garbage collection (WebAssembly)2024-12-11T00:00:00+00:002024-12-11T00:00:00+00:00https://rixx.github.io/baseline-updates/2024/12/11/wasm-garbage-collectioncaniuse · mdn · spec

Garbage collection tracks references for better memory management with garbage-collected languages running in WebAssmbly.

Source features

  • webassembly.garbage-collection [mdn]
]]>New in Low Baseline Support: Tail call optimization (WebAssembly)2024-12-11T00:00:00+00:002024-12-11T00:00:00+00:00https://rixx.github.io/baseline-updates/2024/12/11/wasm-tail-call-optimizationcaniuse · mdn · spec

Tail call optimization discards a caller frame and replaces the call with a jump instruction.

Source features

  • webassembly.tail-calls [mdn]
]]>New in High Baseline Support: Exception handling (WebAssembly)2024-11-03T00:00:00+00:002024-11-03T00:00:00+00:00https://rixx.github.io/baseline-updates/2024/11/03/wasm-exception-handlingcaniuse · mdn · spec

Exceptions break the normal control flow of execution to represent exceptional behavior, such as an error. You can respond to the exception in JavaScript code.

Source features

  • webassembly.api.Exception [mdn]
  • webassembly.api.Exception.Exception [mdn]
  • webassembly.api.Exception.Exception.options_parameter_traceStack [mdn]
  • webassembly.api.Exception.getArg [mdn]
  • webassembly.api.Exception.is [mdn]
  • webassembly.api.Tag [mdn]
  • webassembly.api.Tag.Tag [mdn]
  • webassembly.exception-handling [mdn]
  • webassembly.api.Exception.stack [mdn]
  • webassembly.api.Tag.type [mdn]
]]>New in Low Baseline Support: Typed function references (WebAssembly)2024-09-16T00:00:00+00:002024-09-16T00:00:00+00:00https://rixx.github.io/baseline-updates/2024/09/16/wasm-typed-fun-refscaniuse · mdn · spec

A typed function reference can be called directly.

Source features

  • webassembly.typedFunctionReferences [mdn]
]]>New in High Baseline Support: Threads and atomics (WebAssembly)2024-06-13T00:00:00+00:002024-06-13T00:00:00+00:00https://rixx.github.io/baseline-updates/2024/06/13/wasm-threadscaniuse · mdn · spec

Threads in WebAssembly run code in parallel, while atomic memory instructions can guarantee that no two threads can read or write to shared memory at the same time.

Source features

  • webassembly.api.Memory.Memory.shared [mdn]
  • webassembly.threads-and-atomics [mdn]
]]>New in High Baseline Support: Reference types (WebAssembly)2024-05-19T00:00:00+00:002024-05-19T00:00:00+00:00https://rixx.github.io/baseline-updates/2024/05/19/wasm-reference-typescaniuse · mdn · spec

The externref type can be both a value type and a table element type, while funcref can be a value type.

Source features

  • webassembly.reference-types [mdn]
]]>New in High Baseline Support: Bulk memory operations (WebAssembly)2024-04-25T00:00:00+00:002024-04-25T00:00:00+00:00https://rixx.github.io/baseline-updates/2024/04/25/wasm-bulk-memorycaniuse · mdn · spec

Bulk memory operations, such as copy and init, mirror the efficiency of native memcpy and memmove operations.

Source features

  • webassembly.bulk-memory-operations [mdn]
]]>New in High Baseline Support: Non-trapping float-to-int conversion (WebAssembly)2024-04-25T00:00:00+00:002024-04-25T00:00:00+00:00https://rixx.github.io/baseline-updates/2024/04/25/wasm-non-trapping-float-to-intcaniuse · mdn · spec

Saturating floating-point to integer conversion operators return the maximum or minimum integer value on overflow instead of trapping.

Source features

  • webassembly.non-trapping-float-to-int-conversions [mdn]
]]>New in Low Baseline Support: Extended constant expressions (WebAssembly)2024-03-05T00:00:00+00:002024-03-05T00:00:00+00:00https://rixx.github.io/baseline-updates/2024/03/05/wasm-extended-constant-expressionscaniuse · mdn · spec

The i32.add, i32.sub, i32.mul, i64.add, i64.sub, and i64.mul operations extend constant expressions to include arithmetic.

Source features

  • webassembly.extended-constant-expressions [mdn]
]]>New in High Baseline Support: BigInt to i64 conversion (WebAssembly)2023-10-26T00:00:00+00:002023-10-26T00:00:00+00:00https://rixx.github.io/baseline-updates/2023/10/26/wasm-bigintcaniuse · mdn · spec

Integer values pass bidirectionally between JavaScript and WebAssembly, converted to i64 values in WebAssembly or BigInt values in JavaScript.

Source features

  • webassembly.BigInt-to-i64-integration [mdn]
]]>New in High Baseline Support: Sign extension operators (WebAssembly)2023-10-26T00:00:00+00:002023-10-26T00:00:00+00:00https://rixx.github.io/baseline-updates/2023/10/26/wasm-sign-extension-operatorscaniuse · mdn · spec

Sign-extension operator instructions extend the width of 8-bit, 16-bit, and 32-bit values to 32-bit and 64-bit values.

Source features

  • webassembly.sign-extension-operations [mdn]
]]>New in High Baseline Support: Multi-value (WebAssembly)2023-04-20T00:00:00+00:002023-04-20T00:00:00+00:00https://rixx.github.io/baseline-updates/2023/04/20/wasm-multi-valuecaniuse · mdn · spec

Instructions and blocks can produce multiple result values.

Source features

  • webassembly.multi-value [mdn]
]]>New in High Baseline Support: Import and export of mutable globals (WebAssembly)2022-09-24T00:00:00+00:002022-09-24T00:00:00+00:00https://rixx.github.io/baseline-updates/2022/09/24/wasm-mutable-globalscaniuse · mdn · spec

Mutable global variables are importable and exportable.

Source features

  • webassembly.mutable-globals [mdn]
]]>New in Low Baseline Support: Exception handling (WebAssembly)2022-05-03T00:00:00+00:002022-05-03T00:00:00+00:00https://rixx.github.io/baseline-updates/2022/05/03/wasm-exception-handlingcaniuse · mdn · spec

Exceptions break the normal control flow of execution to represent exceptional behavior, such as an error. You can respond to the exception in JavaScript code.

Source features

  • webassembly.api.Exception [mdn]
  • webassembly.api.Exception.Exception [mdn]
  • webassembly.api.Exception.Exception.options_parameter_traceStack [mdn]
  • webassembly.api.Exception.getArg [mdn]
  • webassembly.api.Exception.is [mdn]
  • webassembly.api.Tag [mdn]
  • webassembly.api.Tag.Tag [mdn]
  • webassembly.exception-handling [mdn]
  • webassembly.api.Exception.stack [mdn]
  • webassembly.api.Tag.type [mdn]
]]>New in Low Baseline Support: Threads and atomics (WebAssembly)2021-12-13T00:00:00+00:002021-12-13T00:00:00+00:00https://rixx.github.io/baseline-updates/2021/12/13/wasm-threadscaniuse · mdn · spec

Threads in WebAssembly run code in parallel, while atomic memory instructions can guarantee that no two threads can read or write to shared memory at the same time.

Source features

  • webassembly.api.Memory.Memory.shared [mdn]
  • webassembly.threads-and-atomics [mdn]
]]>New in Low Baseline Support: Reference types (WebAssembly)2021-11-19T00:00:00+00:002021-11-19T00:00:00+00:00https://rixx.github.io/baseline-updates/2021/11/19/wasm-reference-typescaniuse · mdn · spec

The externref type can be both a value type and a table element type, while funcref can be a value type.

Source features

  • webassembly.reference-types [mdn]
]]>New in Low Baseline Support: Bulk memory operations (WebAssembly)2021-10-25T00:00:00+00:002021-10-25T00:00:00+00:00https://rixx.github.io/baseline-updates/2021/10/25/wasm-bulk-memorycaniuse · mdn · spec

Bulk memory operations, such as copy and init, mirror the efficiency of native memcpy and memmove operations.

Source features

  • webassembly.bulk-memory-operations [mdn]
]]>New in Low Baseline Support: Non-trapping float-to-int conversion (WebAssembly)2021-10-25T00:00:00+00:002021-10-25T00:00:00+00:00https://rixx.github.io/baseline-updates/2021/10/25/wasm-non-trapping-float-to-intcaniuse · mdn · spec

Saturating floating-point to integer conversion operators return the maximum or minimum integer value on overflow instead of trapping.

Source features

  • webassembly.non-trapping-float-to-int-conversions [mdn]
]]>New in Low Baseline Support: BigInt to i64 conversion (WebAssembly)2021-04-26T00:00:00+00:002021-04-26T00:00:00+00:00https://rixx.github.io/baseline-updates/2021/04/26/wasm-bigintcaniuse · mdn · spec

Integer values pass bidirectionally between JavaScript and WebAssembly, converted to i64 values in WebAssembly or BigInt values in JavaScript.

Source features

  • webassembly.BigInt-to-i64-integration [mdn]
]]>New in Low Baseline Support: Sign extension operators (WebAssembly)2021-04-26T00:00:00+00:002021-04-26T00:00:00+00:00https://rixx.github.io/baseline-updates/2021/04/26/wasm-sign-extension-operatorscaniuse · mdn · spec

Sign-extension operator instructions extend the width of 8-bit, 16-bit, and 32-bit values to 32-bit and 64-bit values.

Source features

  • webassembly.sign-extension-operations [mdn]
]]>New in Low Baseline Support: Multi-value (WebAssembly)2020-10-20T00:00:00+00:002020-10-20T00:00:00+00:00https://rixx.github.io/baseline-updates/2020/10/20/wasm-multi-valuecaniuse · mdn · spec

Instructions and blocks can produce multiple result values.

Source features

  • webassembly.multi-value [mdn]
]]>New in High Baseline Support: WebAssembly2020-04-17T00:00:00+00:002020-04-17T00:00:00+00:00https://rixx.github.io/baseline-updates/2020/04/17/wasmcaniuse · mdn · spec

The WebAssembly.instantiate() and WebAssembly.instantiateStreaming() global static methods load WebAssembly code (also known as Wasm), a portable binary instruction format.

Source features

  • webassembly.api [mdn]
  • webassembly.api.CompileError [mdn]
  • webassembly.api.CompileError.CompileError [mdn]
  • webassembly.api.Instance [mdn]
  • webassembly.api.Instance.Instance [mdn]
  • webassembly.api.Instance.exports [mdn]
  • webassembly.api.LinkError [mdn]
  • webassembly.api.LinkError.LinkError [mdn]
  • webassembly.api.Memory [mdn]
  • webassembly.api.Memory.Memory [mdn]
  • webassembly.api.Memory.buffer [mdn]
  • webassembly.api.Memory.grow [mdn]
  • webassembly.api.Module [mdn]
  • webassembly.api.Module.Module [mdn]
  • webassembly.api.Module.customSections_static [mdn]
  • webassembly.api.Module.exports_static [mdn]
  • webassembly.api.Module.imports_static [mdn]
  • webassembly.api.RuntimeError [mdn]
  • webassembly.api.RuntimeError.RuntimeError [mdn]
  • webassembly.api.Table [mdn]
  • webassembly.api.Table.Table [mdn]
  • webassembly.api.Table.get [mdn]
  • webassembly.api.Table.grow [mdn]
  • webassembly.api.Table.length [mdn]
  • webassembly.api.Table.set [mdn]
  • webassembly.api.compile_static [mdn]
  • webassembly.api.instantiate_static [mdn]
  • webassembly.api.validate_static [mdn]
  • webassembly.api.Global [mdn]
  • webassembly.api.Global.Global [mdn]
  • webassembly.api.Global.value [mdn]
  • webassembly.api.Global.valueOf [mdn]
  • webassembly.api.compileStreaming_static [mdn]
  • webassembly.api.instantiateStreaming_static [mdn]
]]>New in Low Baseline Support: Import and export of mutable globals (WebAssembly)2020-03-24T00:00:00+00:002020-03-24T00:00:00+00:00https://rixx.github.io/baseline-updates/2020/03/24/wasm-mutable-globalscaniuse · mdn · spec

Mutable global variables are importable and exportable.

Source features

  • webassembly.mutable-globals [mdn]
]]>