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Building to WebAssembly (WASM)
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It is possible to use Rhai when compiling to WebAssembly (WASM). This yields a scripting engine (and language) that can be run in a standard web browser.
Why you would want to is another matter... as there is already a nice, fast, complete scripting language for the the common WASM environment (i.e. a browser) - and it is called JavaScript.
But anyhow, do it because you can!
When building for WASM, certain features will not be available, such as the script file API's and loading modules from external script files.
Also look into [minimal builds] to reduce generated WASM size. As of this version, a typical, full-featured Rhai scripting engine compiles to a single WASM file less than 200KB gzipped. When excluding features that are marginal in WASM environment, the gzipped payload can be further shrunk to 160KB.
In benchmark tests, a WASM build runs scripts roughly 1.7-2.2x slower than a native optimized release build.