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 input error detection:

This form doesn't check for any input errors and highlight them:

Code here (12329):

Submit:

Note: Manual testing required. A human tester/AI is required to determine if any input errors are checked.