Loac-fr

console.time("foo");
// do stufff
console.timeEnd("foo");
// http://codepen.io/KK4OXJ/pen/eNyRYr

Loac-fr

// http://youmightnotneedjquery.com/
// Returns first element that matches CSS selector {expr}.
// Querying can optionally be restricted to {container}’s descendants
function $(expr, container) {
	return typeof expr === "string"? (container || document).querySelector(expr) : expr || null;
}

// Returns all elements that match CSS selector {expr} as an array.
// Querying can optionally be restricted to {container}’s descendants
function $$(expr, container) {

Loac-fr

<div id="toggle" class="">
	<div class="one"></div>
	<div class="two"></div>
	<div class="three"></div>
</div>
<!-- just toggle the "on" class with js :)  -->