Edge cases (part 1 of hundreds…)

What if their surname only has two letters?
Are we sure that button is big enough for translated text?
What if the user doesn’t have JavaScript on?
Can a colourblind user still understand that?
What happens when network connection drops?
Does this drag-and-drop work properly on a touchscreen?
What if a user receives an abusive message in this inbox?
“You have no friends.” What now?
Your server had a glitch: does the user understand what happened?
Is that target big enough for all users to tap?
What if the CDN takes a while?
Does that field work for people with non-binary genders?
Could someone just build a bot to get around this?
What if the browser is zoomed in?
What if they want to paste from a password manager?
Did you remember that for Amex the CCV is 4 digits long?
Have we tested with VoiceOver?
Wait, couldn’t this become a spam vector?
Does this even load on a 2G connection?
What if the user can’t point with a mouse?
We are stripping hyphens and parentheses from this telephone field, right?
Does that wrap okay?
Oops! They didn't mean to click that: what do they do now?
Doesn’t Apple hold the patent on that?