Revamped testbed

Input error checking (error-detection)

When submitting data (e.g. filling out a form), the system must check for any input errors (e.g. missing required fields.) and highlight them.

No check for required fields:

This form doesn't check if required fields have been filled:

* Your Feedback here (required):

Submit:

Note: Manual testing required (hard to auto-test). A human tester/AI is required to determine if a field is required.