Nope, no message. Nobody has ever told me that they've failed to use my app due to browser issues, so I just haven't ever put mitigations in place for users who

Nope, no message. Nobody has ever told me that they've failed to use my app due to browser issues, so I just haven't ever put mitigations in place for users who try. It's possible that users with old browsers have tried to use my app, found that it didn't work in their legacy browser, and then just moved on without telling me. It's also worth mentioning that my app is for server administration, so my users are more technically-savvy than average and tend to be the kind of people who see the need to use the latest browser versions.