In what sense it is an alternative to ElectronJS?

If size than not that much as Tauri is based on Node.JS that is 56 Mb executable by itself.

Yet Node.JS is pure C/C++ code. It is not clear what does "written in Rust" mean at all and what benefits Rust provides in that setup.

For the comparison: my scapp.js.exe ( https://github.com/c-smile/sciter-js-sdk#demos ) that is Sciter.JS packaged as standalone exe without dependencies is of size 5.3mb - at least 10 times less than Node.JS, Tauri and ElectronJS.

That exe includes HTML/CSS, QuickJS (ES2020) engines and essential portions of Node.JS runtime: https://github.com/c-smile/sciter-js-sdk/blob/main/docs/md/m...

So is the question above, alternative in what sense?