Ask IH: How do you test your web app?

I'm working on a product which will facilitate Automatic Frontend Testing for web applications. I'm curious about what kind of testing you perform on your applications and how you execute it.

Do you write Unit-Tests, UI Automation, or both?

Do you test specific buckets like Accessibility, Performance, SEO, Redlines, Responsiveness, Functionality, Semantics, etc.?

Is your test automation integrated into a CI pipeline?

Which frameworks do you use?

Would you be interested in using a product that automatically tested most of your application with zero-code? (This would be limited to almost all buckets except application functionality, which will require some manual intervention) .