Since I dont know JavaScript yet, has anybody found some interesting workarounds only using HTML5 and CSS3?

Question

So far I know HTML and CSS pretty well, and because I have yet to learn JavaScript, I decided to dive deep into what I know and figured out a lot of nifty things. Has anybody else come across something interesting?(Ranging from special tricks to advanced features)
Here is a collection of my projects: https://jsfiddle.net/user/Jaydorr/fiddles (run the site in desktop mode)
https://code.sololearn.com/Wft01FCQQ0Zt/?ref=app

Answer 1

You could program element to animate using CSS animation.

In fact, you could make most static webpages impressively using HTML & CSS only, without any Javscript code.

https://code.sololearn.com/WE6a4llbDxaW/?ref=app

Answer 2

Nice stuff Calvin! Looks like the work of a professional!

https://code.sololearn.com/WPRfBR2001z1/?ref=app