Remember when the .tk TLD became free 20 years ago ? Every hobbyist took one, then scammers followed, then Facebook and antiviruses started blocking it. I remember publishing a website for a class on my .tk domain, the teacher couldn't open it and I almost got a failing grade because of it.
A friend almost failed an IT class because his website didn't render at all in IE6. This was during the time of IE9. The teacher just hadn't updated their browser in a long time. I don't get how you get to be an IT teacher without knowing the most basic troubleshooting steps to get assignments to run.
Heh…I once was in a state-level coding event (it was a small portion of a larger competition) where half of the test was turning in code on a CD during the competition, with the written half during the event. My CD was deemed unusable for whatever reason (it had worked on XP and Fedora 6 or 7 at home) and didn't count towards my score. I still got second in the event. I declined to continue because I couldn't trust that the judges would be able judge my submission fairly and that with half of my score missing I still got second that I didn't need to prove anything else at the cost of more after-school practice hours and wrecking my perfect attendance record during my senior year to travel to nationals.