There's a website that shaming HTML bad practices

This article was published on May 03, 2021

The site is called HTMHell and aggregates a bunch of bad practices while writing HTML markup.

HTMLHell website

The positive aspect of this website is that it shows what's wrong, why is wrong, and also the correct way of doing that based on trustworthy resources.

Also, since it's open-source, people can contribute which their finds.