strange question...but if you were to create a new mobile browser for android (with some custom features), would you recommend Chromium or Cobalt ?
Check out the supported features:
https://cobalt.dev/development/reference/supported-features....
I suspect this could make an excellent renderer for an app doing markdown previews, CHM files, ebooks and such for example.
Is there some tool for evaluating pages for "will they run in Cobalt"?
I can see uses for this if you can do that. If you can't, it's limited to sites designed for it.
Websites kind of have to be built specifically for Cobalt to work well.