Oh my gods I wish. I was working on a webapp some months ago and was having the weirdest issue with how things were updating. There was a hard to discern pattern to it, but eventually when I really dug into it, I realised that it was generating elements with duplicate IDs, then it all made sense.

If the browser yelled at me, at least in the dev tools, it would’ve saved me a lot of work trying to figure things out.