WebAssembly 2024-09-17 > 2024-10-01

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This is a request for transition for version 2.0 of all 3 WebAssembly specifications, namely the core spec, which defines the core code format and semantics;
the JS API specification, which provides a JavaScript API for interacting with WebAssembly; and the Web API specification, which describes the integration of WebAssembly with the broader web platform.

• What and when is your next expected transition?
  CR, as soon as horizontal review is done.

• What has changed since any previous review?
  All of the analysis herein concerns the changes made since Wasm 1.0. These are listed
  here and include the following extension
  proposals:
  Sign extension instructions; Non-trapping float-to-int conversions; multi-value block types and function results;
  reference types, table instructions, and multiple tables; bulk memory and table instructions; SIMD vector instructions. Links to overviews of each proposal can be found in the proposal's respective github repo (these are listed here).

• Please point to the results of your own self-review (see https://w3c.github.io/apa/fast/checklist.html)
  Check against a11y checklist for CR transition WebAssembly/spec#1805

• Where and how to file issues arising?
  https://github.com/WebAssembly/spec/issues

• Pointer to any explainer for the spec?
  There is not an explainer for the entire spec (and in any case it is fairly large). Links to explainers/overviews for each
  of the 5 proposals can be found in the proposal's respective github repo (these are listed here).

Other comments:
Since WebAssembly is a specification for the representation and semantics of computation, it seems there is very little interaction with accessibility principles.

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For review convenience, here is a list of the explainers for the proposals that have gone into 2.0, compared to 1.0 (currently in REC state). These are informal descriptions of the proposed changes and are not canonical, but describe an overview of the feature and could be useful in determining whether there is anything of interest for horizontal reviewers.

Note again also that the core spec contains a list of additions since version 1.0 and summarizes the addition to the core spec. The table summarizes the effect on the JS spec. The Web spec is unchanged since 1.0

Explainer	Specs affected	JS Spec difference summary
Nontrapping float-int conversion	Core
Sign-extension operators	Core
Multi-value block and function returns	Core, JS	Multi-value returns can be passed into JS as JS Arrays
JS BigInt Integration	JS	Wasm i64 values can be passed to and from JS as BigInt values
Reference Types	Core, JS	References to JS objects can be passed to and from Wasm as externref values.
Bulk Memory and table instructions	Core
SIMD Vector instructions	Core