Now Stable

"New on the Web": For a given set of browsers, what APIs became stable and when, ordered reverse chronologically.

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Browsers
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Stable APIs

Below is a list of features that are in Chrome, Firefox, Safari, and Edge, ordered reverse chronologically by when they became stable (i.e, available in the last browser).

2026/1

API First Browser Date Last Browser Date Days Notes
webassembly.api.Memory.toFixedLengthBuffer 📋Firefox11/11/2025 Edge1/21/202671
webassembly.api.Memory.toResizableBuffer 📋Firefox11/11/2025 Edge1/21/202671

2025/12

API First Browser Date Last Browser Date Days Notes
webassembly.jsStringBuiltins 📋Chrome10/15/2024 Safari12/12/2025423

2025/3

API First Browser Date Last Browser Date Days Notes
webassembly.api.JSTag_static 📋Chrome7/18/2023 Safari3/31/2025622

2024/12

API First Browser Date Last Browser Date Days Notes
webassembly.garbage-collection 📋Chrome10/31/2023 Safari12/11/2024407
webassembly.tail-calls 📋Chrome4/4/2023 Safari12/11/2024617

2024/9

API First Browser Date Last Browser Date Days Notes
webassembly.typedFunctionReferences 📋Chrome10/31/2023 Safari9/16/2024321

2024/3

API First Browser Date Last Browser Date Days Notes
webassembly.extended-constant-expressions 📋Firefox4/11/2023 Safari3/5/2024329

2023/3

API First Browser Date Last Browser Date Days Notes
webassembly.fixed-width-SIMD 📋Chrome5/25/2021 Safari3/27/2023671

2022/5

API First Browser Date Last Browser Date Days Notes
webassembly.api.Exception 📋Chrome10/19/2021 Firefox5/3/2022196
webassembly.api.Exception.Exception 📋Chrome10/19/2021 Firefox5/3/2022196
webassembly.api.Exception.Exception.options_parameter_traceStack Chrome10/19/2021 Firefox5/3/2022196
webassembly.api.Exception.getArg 📋Chrome10/19/2021 Firefox5/3/2022196
webassembly.api.Exception.is 📋Chrome10/19/2021 Firefox5/3/2022196
webassembly.api.Tag 📋Chrome10/19/2021 Firefox5/3/2022196
webassembly.api.Tag.Tag 📋Chrome10/19/2021 Firefox5/3/2022196
webassembly.exception-handling 📋Chrome10/19/2021 Firefox5/3/2022196

2021/12

API First Browser Date Last Browser Date Days Notes
webassembly.api.Memory.Memory.shared 📋Chrome4/23/2019 Safari12/13/2021965
Safari: Shared WebAssembly.Memory is gated behind COOP/COEP. For more detail, read Making your website "cross-origin isolated" using COOP and COEP.Safari on iOS: Shared WebAssembly.Memory is gated behind COOP/COEP. For more detail, read Making your website "cross-origin isolated" using COOP and COEP.WebView on iOS: Shared WebAssembly.Memory is gated behind COOP/COEP. For more detail, read Making your website "cross-origin isolated" using COOP and COEP.
webassembly.threads-and-atomics 📋Chrome4/23/2019 Safari12/13/2021965

2021/11

API First Browser Date Last Browser Date Days Notes
webassembly.reference-types 📋Firefox7/28/2020 Edge11/19/2021479

2021/10

API First Browser Date Last Browser Date Days Notes
webassembly.bulk-memory-operations 📋Chrome6/4/2019 Safari10/25/2021874
webassembly.non-trapping-float-to-int-conversions 📋Edge10/2/2018 Safari10/25/20211119

2021/9

API First Browser Date Last Browser Date Days Notes
webassembly.api.compileStreaming_static 📋Chrome7/25/2017 Safari9/20/20211518
webassembly.api.instantiateStreaming_static 📋Chrome7/25/2017 Safari9/20/20211518

2021/4

API First Browser Date Last Browser Date Days Notes
webassembly.BigInt-to-i64-integration 📋Firefox6/30/2020 Safari4/26/2021300
webassembly.sign-extension-operations 📋Chrome9/4/2018 Safari4/26/2021965

2020/10

API First Browser Date Last Browser Date Days Notes
webassembly.multi-value 📋Safari3/24/2020 Chrome10/20/2020210

2020/3

API First Browser Date Last Browser Date Days Notes
webassembly.api.Global 📋Chrome9/4/2018 Safari3/24/2020567
webassembly.api.Global.Global 📋Chrome9/4/2018 Safari3/24/2020567
Chrome: Constructing a Global with a value of v128 produces a TypeError.Chrome Android: Constructing a Global with a value of v128 produces a TypeError.Deno: Constructing a Global with a value of v128 produces a TypeError.Edge: Constructing a Global with a value of v128 produces a TypeError.Node.js: Constructing a Global with a value of v128 produces a TypeError.Quest Browser: Constructing a Global with a value of v128 produces a TypeError.Opera: Constructing a Global with a value of v128 produces a TypeError.Opera Android: Constructing a Global with a value of v128 produces a TypeError.Samsung Internet: Constructing a Global with a value of v128 produces a TypeError.WebView Android: Constructing a Global with a value of v128 produces a TypeError.
webassembly.api.Global.value 📋Chrome9/4/2018 Safari3/24/2020567
webassembly.api.Global.valueOf 📋Chrome9/4/2018 Safari3/24/2020567
webassembly.mutable-globals 📋Chrome9/4/2018 Safari3/24/2020567

2017/10

API First Browser Date Last Browser Date Days Notes
webassembly.api 📋Firefox3/7/2017 Edge10/17/2017224
webassembly.api.CompileError 📋Firefox3/7/2017 Edge10/17/2017224
webassembly.api.CompileError.CompileError 📋Firefox3/7/2017 Edge10/17/2017224
webassembly.api.Instance 📋Firefox3/7/2017 Edge10/17/2017224
webassembly.api.Instance.Instance 📋Firefox3/7/2017 Edge10/17/2017224
webassembly.api.Instance.exports 📋Firefox3/7/2017 Edge10/17/2017224
webassembly.api.LinkError 📋Firefox3/7/2017 Edge10/17/2017224
webassembly.api.LinkError.LinkError 📋Firefox3/7/2017 Edge10/17/2017224
webassembly.api.Memory 📋Firefox3/7/2017 Edge10/17/2017224
webassembly.api.Memory.Memory 📋Firefox3/7/2017 Edge10/17/2017224
webassembly.api.Memory.buffer 📋Firefox3/7/2017 Edge10/17/2017224
webassembly.api.Memory.grow 📋Firefox3/7/2017 Edge10/17/2017224
webassembly.api.Module 📋Firefox3/7/2017 Edge10/17/2017224
webassembly.api.Module.Module 📋Firefox3/7/2017 Edge10/17/2017224
webassembly.api.Module.customSections_static 📋Firefox3/7/2017 Edge10/17/2017224
webassembly.api.Module.exports_static 📋Firefox3/7/2017 Edge10/17/2017224
webassembly.api.Module.imports_static 📋Firefox3/7/2017 Edge10/17/2017224
webassembly.api.RuntimeError 📋Firefox3/7/2017 Edge10/17/2017224
webassembly.api.RuntimeError.RuntimeError 📋Firefox3/7/2017 Edge10/17/2017224
webassembly.api.Table 📋Firefox3/7/2017 Edge10/17/2017224
webassembly.api.Table.Table 📋Firefox3/7/2017 Edge10/17/2017224
webassembly.api.Table.get 📋Firefox3/7/2017 Edge10/17/2017224
webassembly.api.Table.grow 📋Firefox3/7/2017 Edge10/17/2017224
webassembly.api.Table.length 📋Firefox3/7/2017 Edge10/17/2017224
webassembly.api.Table.set 📋Firefox3/7/2017 Edge10/17/2017224
webassembly.api.compile_static 📋Firefox3/7/2017 Edge10/17/2017224
webassembly.api.instantiate_static 📋Firefox3/7/2017 Edge10/17/2017224
webassembly.api.validate_static 📋Firefox3/7/2017 Edge10/17/2017224