So, a navigation fails e.g. due to a CSP error or something. Does that look like an error response? (in BiDi; afaict HTTP WebDriver is always going to time out in this case per spec)

(assuming the navigation was initiated with a WebDriver command; obviously when it happens for some other reason e.g. a link being clicked there's no response as such)

I'd expect /some/ sort of error?

certificate error, DNS failure, etc. all kinda the same?

Hmm, the way things are set up it's hard to pack more than a message into an error. Maybe it makes sense to return a success response but with a body indicating that the navigation failed? That's kind of how CDP works although it doens't quite have the same error concept I think