First example of Three.js doesn't work

I'm about to learn `three.js`. I've downloaded the `library` from github: [**three.js**][1]

I tried to run the first example of three.js in the link above. The weird problem is, it's working in jsFiddle but it not working in my computer.

I've this error in console: TypeError: document.body is null [Break On This Error] document.body.appendChild( renderer.domElement );
**[jsFiddle Live Working Demo][2]**

And here is my code exactly copied from link above:
*And yes the three.js included in the page.* var camera, scene, renderer; var geometry, material, mesh; init(); animate(); function init() { camera = new THREE.PerspectiveCamera( 75, window.innerWidth / window.innerHeight, 1, 10000 ); camera.position.z = 1000; scene = new THREE.Scene(); geometry = new THREE.CubeGeometry( 200, 200, 200 ); material = new THREE.MeshBasicMaterial( { color: 0xff0000, wireframe: true } ); mesh = new THREE.Mesh( geometry, material ); scene.add( mesh ); renderer = new THREE.CanvasRenderer(); renderer.setSize( window.innerWidth, window.innerHeight ); document.body.appendChild( renderer.domElement ); } function animate() { // note: three.js includes requestAnimationFrame shim requestAnimationFrame( animate ); mesh.rotation.x += 0.01; mesh.rotation.y += 0.02; renderer.render( scene, camera ); } [1]: [2]:

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