https://marksheet.io/
https://devdocs.io/
https://doka.guide
https://web.dev/learn

https://hostingfacts.com/html-cheat-sheet/
https://websitesetup.org/html5-cheat-sheet/
http://www.simplehtmlguide.com/cheatsheet.php

http://htmldog.com/references/html/tags/

https://web.stanford.edu/group/csp/cs21/htmlcheatsheet.pdf

2017
https://medium.com/@wesharehoodies/modern-frontend-hacking-cheatsheets-df9c2566c72a
2010
https://www.wired.com/2010/02/html_cheatsheet/