I'm looking for an alternative to UI Builder.
Ideally I'd like to have basically a Chromium instance atop Unity3D which would have its JS calls somehow land in the C# (maybe in the "Update" loop it listens to a constant stream of potential calls and the parameters will correspond to function names in my Unity code, I don't know)
here's what I found which doesn't quite live up to my expectations:
Unity WebView doesn't support Windows.
3D WebView for Windows and macOS (Web Browser) requires the UI to be served on an actual live URL and for Unity to access it via that URL and for all interaction to be handled via API, impractical or slow at best.
PowerUI - HTML/CSS is interesting, but was made in 2011. The documentation is all gone. the support for css feature is probably incredibly slim.
Embedded Browser looks pretty good, but I'm unsure that it could be bent into a UI system. I want it to frame my game, not to cover it.
This Unity forum thread may be relevant. Chromium Embedded Framework was a tool used by some assets on the asset store to create chromium UI but it has been removed.
If not using these assets, how can I implement my idea of using Chromium as my UI layer?