Thanks to Aaron for posting this. Such a great reminder.
Anyone interested in this subject, check out a series of three very tiny books called “UPGRADE YOUR HTML” by Jens Oliver Meiert.
They give great step-by-step examples for eliminating optional tags and attributes, reducing HTML to its cleanest simplest valid form. The author is a super-expert in this specific subject, working with Google and W3C on this. His bio here: https://meiert.com/en/biography/
Reminder of what? To me this reads like satire, even if it wasn't intended as such.