Edit in JSFiddle

var width = 400,
    height = 300;

Crafty.init(width, height);

var box = Crafty.e("2D, DOM, Color")
  .attr({ x: 15, y: 30, w: 20, h: 20 })
  .color("#FF9900");
<h1>Demo 1: Initializing Crafty</h1>

<div id="cr-stage"></div>