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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Stable APIs

Below is a list of features that are in Edge and Safari, 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 📋Safari12/12/2025 Edge1/21/202640
webassembly.api.Memory.toResizableBuffer 📋Safari12/12/2025 Edge1/21/202640

2025/12

API First Browser Date Last Browser Date Days Notes
webassembly.jsStringBuiltins 📋Edge10/17/2024 Safari12/12/2025421

2025/5

API First Browser Date Last Browser Date Days Notes
webassembly.branch-hinting 📋Safari9/12/2022 Edge5/29/2025990

2025/3

API First Browser Date Last Browser Date Days Notes
webassembly.api.JSTag_static 📋Edge7/21/2023 Safari3/31/2025619

2024/12

API First Browser Date Last Browser Date Days Notes
webassembly.garbage-collection 📋Edge11/2/2023 Safari12/11/2024405
webassembly.tail-calls 📋Edge4/6/2023 Safari12/11/2024615

2024/9

API First Browser Date Last Browser Date Days Notes
webassembly.typedFunctionReferences 📋Edge11/2/2023 Safari9/16/2024319

2024/3

API First Browser Date Last Browser Date Days Notes
webassembly.extended-constant-expressions 📋Edge6/2/2023 Safari3/5/2024277

2023/3

API First Browser Date Last Browser Date Days Notes
webassembly.fixed-width-SIMD 📋Edge5/27/2021 Safari3/27/2023669

2021/12

API First Browser Date Last Browser Date Days Notes
webassembly.api.Exception 📋Edge10/21/2021 Safari12/13/202153
webassembly.api.Exception.Exception 📋Edge10/21/2021 Safari12/13/202153
webassembly.api.Exception.Exception.options_parameter_traceStack Edge10/21/2021 Safari12/13/202153
webassembly.api.Exception.getArg 📋Edge10/21/2021 Safari12/13/202153
webassembly.api.Exception.is 📋Edge10/21/2021 Safari12/13/202153
webassembly.api.Memory.Memory.shared 📋Edge1/15/2020 Safari12/13/2021698
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.api.Tag 📋Edge10/21/2021 Safari12/13/202153
webassembly.api.Tag.Tag 📋Edge10/21/2021 Safari12/13/202153
webassembly.exception-handling 📋Edge10/21/2021 Safari12/13/202153
webassembly.threads-and-atomics 📋Edge1/15/2020 Safari12/13/2021698

2021/11

API First Browser Date Last Browser Date Days Notes
webassembly.reference-types 📋Safari10/25/2021 Edge11/19/202125

2021/10

API First Browser Date Last Browser Date Days Notes
webassembly.bulk-memory-operations 📋Edge1/15/2020 Safari10/25/2021649
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 📋Edge10/17/2017 Safari9/20/20211434
webassembly.api.instantiateStreaming_static 📋Edge10/17/2017 Safari9/20/20211434

2021/4

API First Browser Date Last Browser Date Days Notes
webassembly.BigInt-to-i64-integration 📋Edge8/27/2020 Safari4/26/2021242
webassembly.sign-extension-operations 📋Edge10/2/2018 Safari4/26/2021937

2020/10

API First Browser Date Last Browser Date Days Notes
webassembly.multi-value 📋Safari3/24/2020 Edge10/9/2020199

2020/3

API First Browser Date Last Browser Date Days Notes
webassembly.api.Global 📋Edge1/15/2020 Safari3/24/202069
webassembly.api.Global.Global 📋Edge1/15/2020 Safari3/24/202069
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 📋Edge1/15/2020 Safari3/24/202069
webassembly.api.Global.valueOf 📋Edge1/15/2020 Safari3/24/202069
webassembly.mutable-globals 📋Edge1/15/2020 Safari3/24/202069

2017/10

API First Browser Date Last Browser Date Days Notes
webassembly.api 📋Safari9/19/2017 Edge10/17/201728
webassembly.api.CompileError 📋Safari9/19/2017 Edge10/17/201728
webassembly.api.CompileError.CompileError 📋Safari9/19/2017 Edge10/17/201728
webassembly.api.Instance 📋Safari9/19/2017 Edge10/17/201728
webassembly.api.Instance.Instance 📋Safari9/19/2017 Edge10/17/201728
webassembly.api.Instance.exports 📋Safari9/19/2017 Edge10/17/201728
webassembly.api.LinkError 📋Safari9/19/2017 Edge10/17/201728
webassembly.api.LinkError.LinkError 📋Safari9/19/2017 Edge10/17/201728
webassembly.api.Memory 📋Safari9/19/2017 Edge10/17/201728
webassembly.api.Memory.Memory 📋Safari9/19/2017 Edge10/17/201728
webassembly.api.Memory.buffer 📋Safari9/19/2017 Edge10/17/201728
webassembly.api.Memory.grow 📋Safari9/19/2017 Edge10/17/201728
webassembly.api.Module 📋Safari9/19/2017 Edge10/17/201728
webassembly.api.Module.Module 📋Safari9/19/2017 Edge10/17/201728
webassembly.api.Module.customSections_static 📋Safari9/19/2017 Edge10/17/201728
webassembly.api.Module.exports_static 📋Safari9/19/2017 Edge10/17/201728
webassembly.api.Module.imports_static 📋Safari9/19/2017 Edge10/17/201728
webassembly.api.RuntimeError 📋Safari9/19/2017 Edge10/17/201728
webassembly.api.RuntimeError.RuntimeError 📋Safari9/19/2017 Edge10/17/201728
webassembly.api.Table 📋Safari9/19/2017 Edge10/17/201728
webassembly.api.Table.Table 📋Safari9/19/2017 Edge10/17/201728
webassembly.api.Table.get 📋Safari9/19/2017 Edge10/17/201728
webassembly.api.Table.grow 📋Safari9/19/2017 Edge10/17/201728
webassembly.api.Table.length 📋Safari9/19/2017 Edge10/17/201728
webassembly.api.Table.set 📋Safari9/19/2017 Edge10/17/201728
webassembly.api.compile_static 📋Safari9/19/2017 Edge10/17/201728
webassembly.api.instantiate_static 📋Safari9/19/2017 Edge10/17/201728
webassembly.api.validate_static 📋Safari9/19/2017 Edge10/17/201728