What is the difference between ___ and ___ in the front-end development?

Frontend
A Simple Explanation of Event Delegation in JavaScript
juliangarnier/anime
:focus-within
Style settings with css variables
Are you using SVG favicons yet? A guide for modern browsers.
Synth Canyon Run
CSS Findings From The New Facebook Design - Ahmad Shadeed
How to create an autocomplete input with only HTML
Styling The Good Ol' Button Element - Ahmad Shadeed
Capping image fidelity on ultra-high resolution devices
Styled System
7 Uses for CSS Custom Properties
Shadows
Thomas Steiner on Twitter
CSS @ CDS
Pixi.js Circulator
kentcdodds/babel-plugin-preval
1 element card background patterns
Patterns for Practical CSS Custom Properties Use
3D Boxes Loader CSS only
overscroll-behavior
Practical Ways to Write Better JavaScript
line-clamp
Image Support for the Async Clipboard API | Web
Assortment/darkmodejs
Web Extension API for Safari
Rainbow Star Generator
Zdog Space Scene
Extract critical CSS