I'm currently working on a Sciter-like solution that does support widely used CSS features such as Flexbox, CSS Grid, Media Queries, CSS Variables, etc. Althoug

I'm currently working on a Sciter-like solution that does support widely used CSS features such as Flexbox, CSS Grid, Media Queries, CSS Variables, etc. Although we're not planning to ship a JS engine: scripting will be with Rust that compiles to WASM when running on web. Binary sizes are currently around ~12mb which isn't as good as Sciter but is quite a bit better than Electron.