paulirish

What forces layout / reflow

All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. This is also called reflow or layout thrashing, and is common performance bottleneck.

Generally, all APIs that synchronously provide layout metrics will trigger forced reflow / layout. Read on for additional cases and details.

Element APIs

Getting box metrics

• elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent

polotek

// Grab the EventEmitter constructor. events is a core node module.
var Emitter = require('events').EventEmitter;

// Our internal function will generate random numbers
function randomInt(limit) {
  return Math.ceil( Math.random() * limit );
}

module.exports = function(limit) {
  if(!(limit && limit > 0)) {