Background Colour Randomiser

/**
 * Randomise the colour of every element on the page every 5000ms
 * Just for fun.
 *
 * @author Caelan Stewart
 */

setInterval(function() {
    var count = 0;

    function chaos(element) {
        // Check that this element is standard element, and not a text node or some other kind
        if(element.nodeType === 1) {
            var childNodesLen = element.childNodes.length,
                iter;

            // Generate random colour
            element.style.backgroundColor = '#' + ((1 << 24) * Math.random() | 0).toString(16);

            // Iterate through children and self-invoke this function for each child element.
            for(iter = 0; iter < childNodesLen; ++iter) {
                chaos(element.childNodes[iter]);
            }

            count++;
        }
    }

    var start = Date.now();

    chaos(document.body);

    console.log('Took: ' + (Date.now() - start) + 'ms');
    console.log('Elements: ' + count);
}, 5000);