Here's a thread to catalog any minor DOM updates we do throughout 2023 just to give folks in the user community a bit of a heads up and an official source of documentation around any DOM changes.
This is a "best effort" source and we will try to note any changes here that will impact user scripts as best we can. Unfortunately, we can't promise that we'll catch everything that might break your scripts.
If you're a script maintainer or heavy user of scripts, we encourage you follow the answer, so you get notifications of changes.