This website show us how to manage HTML DOM with vanilla JavaScript only for modern browsers and IE 11+

CSS variables, now enjoying fairly good browser support, are opening up exciting possibilities for more dynamic styling. Having true CSS variables means that we can get and set their values in JavaScript, allowing us to build cool features like live theming. Post written by Jonathan Harrell.

JavaScript "The Right Way" by William Oliveira & Allan. This is a guide intended to introduce new developers to JavaScript and help experienced developers learn more about its best practices.