CSS

Diverse

Better conditional classnames for hack-free CSS
Conditional Stylesheets vs CSS Hacks? Answer: Neither!
Conditional Stylesheets

http://www.w3.org/Style/CSS/
https://developer.mozilla.org/en-US/docs/Web/CSS/Reference

https://davidwalsh.name/css-cube
https://desandro.github.io/3dtransforms/docs/cube.html
Demo / Source code reference: cube_demo.html

https://codepen.io/jkantner/pen/RwaWZyK
Demo / Source code reference: Radios Under The Hood

https://desandro.github.io/3dtransforms/docs/cube.html

CSS3 Progress Bars
css-spinners.com  (Spinner examples)
14 CSS Circle Menus
Circular menu

CSS Shapes Explained: How to Draw a Circle, Triangle, and More Using Pure CSS

A Complete Guide to Flexbox
A Complete Guide to Grid

CSS animation

Demo / Source code reference: animate-zoom

More info:
CSS Animations
CSS transform Property
CSS: :before and :after pseudo elements in practice

CSS variables

CSS:

More info:
:root
Using CSS custom properties (variables)
Specificity

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