// module aliases
var Engine = Matter.Engine,
    Render = Matter.Render,
    Runner = Matter.Runner,
    Bodies = Matter.Bodies,
    Composite = Matter.Composite;

// create an engine
var engine = Engine.create({
    enableSleeping: true,
});

// create a renderer
var render = Render.create({
    element: document.body,
    engine: engine
});

// create two boxes and a ground
var ground = Bodies.rectangle(400, 500, 700, 50, { isStatic: true });
var boxA = Bodies.rectangle(401, 240, 40, 20);
var boxB = Bodies.rectangle(415, 470, 40, 20, { isStatic: true });

// add all of the bodies to the world
Composite.add(engine.world, [boxA, boxB, ground]);

// run the renderer
Render.run(render);

// create runner
var runner = Runner.create();

// run the engine
Runner.run(runner, engine);