[jholman]

> but I know that the one on MDN works and I won't hit any unexpected edge case

MDN is a wiki. People who want to contribute documentation or examples do so. Sometimes they make mistakes. Sometimes they're suffering from Dunning-Kruger. It is unreasonable to assume that the example will work and will not have unexpected edge cases.

It's the best resource I know on the web, which is I recommend it, and why I've contributed to it, but it's a wiki. Caveat emptor. (Caveat lector?)