CSS Object Model (CSSOM) - https://css-tricks.com/an-introduction-and-guide-to-the-css-object-model-cssom/
Interactive guide flexbox - https://www.joshwcomeau.com/css/interactive-guide-to-flexbox/
CSS Cheatsheet - https://htmlcheatsheet.com/css/
Background Gradients - https://webgradients.com/
Shadow Generator - https://neumorphism.io/
Color Pallete - https://mycolor.space/
Interactive game to learn flex - https://flexboxfroggy.com/
Interactive game to learn Grid - https://cssgridgarden.com/
Custom Border Radius - https://9elements.github.io/fancy-border-radius/
Clip Path Maker - https://bennettfeely.com/clippy/
Pie Chart Generator - https://bennettfeely.com/csspiechart/
Interactive flexbox - https://bennettfeely.com/flexplorer/
::marker pseudo-element - https://css-tricks.com/almanac/selectors/m/marker/
The Power of :has pseudo-class - https://webkit.org/blog/13096/css-has-pseudo-class/
::before & ::after pseudo elements - https://css-tricks.com/7-practical-uses-for-the-before-and-after-pseudo-elements-in-css/
Color Formats - https://www.joshwcomeau.com/css/color-formats/
Fallback font generator - https://screenspan.net/fallback
CSS selectors visual guide - https://fffuel.co/css-selectors
CSS cascade layers - https://www.smashingmagazine.com/2022/01/introduction-css-cascade-layers/
CSS @scope - https://developer.chrome.com/articles/at-scope/
CSS One-Line Upgrades (gems) - https://moderncss.dev/12-modern-css-one-line-upgrades/
Stack Contexts - https://www.joshwcomeau.com/css/stacking-contexts/
CSS Time Based Animations - https://yuanchuan.dev/time-based-css-animations