No-Library (pure JS), HTML, CSS, JavaScript
A simple localization framework that uses tagged template literals
a handy function to keep a number inside a range
Based on this excellent answer: https://stackoverflow.com/questions/16797092/how-can-i-generate-random-data-that-simulates-an-audio-signal
jQuery 3.4.1, HTML, CSS, JavaScript
with CSS animation
jQuery 2.1.3, HTML, CSS, JavaScript