Not yet stable

For a given set of browsers, what APIs are not yet in all of them.

Example Comparisons
Browsers
Features

Summary

A count of the number of APIs are in Browser X but not in Browser Y.
Not in EdgeNot in Safari
In Edge 11
In Safari 2

Unstable APIs

Below is a list of features that are not in all of Edge and Safari

Raw Data

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WebAssembly Data

API First Browser Date Days in Limbo Notes
webassembly.api.Exception.stack Edge10/21/20211610
webassembly.api.Module.Module.compile_options 📋Edge10/17/2024518
webassembly.api.Tag.type 📋Safari12/13/20211557
webassembly.api.compileStreaming_static.compile_options 📋Edge10/17/2024518
webassembly.api.compile_static.compile_options 📋Edge10/17/2024518
webassembly.api.instantiateStreaming_static.compile_options 📋Edge10/17/2024518
webassembly.api.instantiate_static.compile_options 📋Edge10/17/2024518
webassembly.api.validate_static.compile_options 📋Edge10/17/2024518
webassembly.exceptionsFinal 📋Safari3/31/2025353
webassembly.jspi 📋Edge5/29/2025294
webassembly.memory64 📋Edge2/6/2025406
webassembly.multiMemory 📋Edge12/7/2023833
webassembly.relaxed-SIMD 📋Edge6/2/20231021