This is the unpublished documentation of wasm-bindgen, the published documentation is available on the main Rust and WebAssembly documentation site . Features documented here may not be available in released versions of wasm-bindgen.


The web-sys crate provides raw bindings to all of the Web's APIs, and its source lives at wasm-bindgen/crates/web-sys.

The web-sys crate is entirely mechanically generated inside using wasm-bindgen's WebIDL frontend and the WebIDL interface definitions for Web APIs. This means that web-sys isn't always the most ergonomic crate to use, but it's intended to provide verified and correct bindings to the web platform, and then better interfaces can be iterated on!

Documentation for the published version of this crate is available on but you can also check out the master branch documentation for the crate.