Check that the page has finished loading

is_dom_ready.js

// The basic check
if(document.readyState === 'complete') {
    // good to go!
}

// Polling for the sake of my intern tests
var interval = setInterval(function() {
    if(document.readyState === 'complete') {
        clearInterval(interval);
        done();
    }    
}, 100);