10 What-If Tests

Format: Ask 10 edge-case questions about your app, then actually test them.

1. What if the username has 100 characters?
2. What if the user closes the page during form submission?
3. What if two users edit the same content simultaneously?
4. What if the network drops mid-file-upload?
5. What if the user copy-pastes HTML into an input field?
6. What if there are 1 million records in the database?
7. What if the user is on a 10-year-old phone?
8. What if the user is colorblind?
9. What if the user's timezone differs from the server's timezone?
10. What if the user clicks the "Submit" button twice?

Actually test each question. Record results: Did it crash? Did it show an error? Did it behave normally?