wesbos

function testCSSVariables() {
 var color = 'rgb(255, 198, 0)';
 var el = document.createElement('span');

 el.style.setProperty('--color', color);
 el.style.setProperty('background', 'var(--color)');
 document.body.appendChild(el);

 var styles = getComputedStyle(el);
 var doesSupport = styles.backgroundColor === color;

paulirish

/* bling.js */
window.$ = document.querySelector.bind(document);
window.$$ = document.querySelectorAll.bind(document);
Node.prototype.on = window.on = function(name, fn) { this.addEventListener(name, fn); };
NodeList.prototype.__proto__ = Array.prototype;
NodeList.prototype.on = function(name, fn) { this.forEach((elem) => elem.on(name, fn)); };

magicznyleszek

CSS Selectors Cheatsheet

Hi! If you see an error or something is missing (like :focus-within for few years :P) please let me know ❤️

Element selectors

Element -- selects all h2 elements on the page

h2 {