Check twitter embed iframe is loaded

twitterembed.js

//Load/Enqueue the twitter widgets.js 
window.twttr.ready(function (twttr) {
    // At this point the widget.js file had been loaded.
    // We can now make use of the twttr events
    twttr.events.bind('rendered', function (event) {
         // At this point the tweet as been fully loaded
         // and rendered and you we can proceed with our Javascript
        window.console.log("Created widget", event.target.id);
    });
});