YouTube iframe API with script fetching commented out

iframe_api.js

if (!window['YT']) {
    var YT = {
        loading: 0,
        loaded: 0
    };
}
if (!window['YTConfig']) {
    var YTConfig = {
        'host': 'http://www.youtube.com'
    };
}
if (!YT.loading) {
    YT.loading = 1;
    (function() {
        var l = [];
        YT.ready = function(f) {
            if (YT.loaded) {
                f();
            } else {
                l.push(f);
            }
        };
        window.onYTReady = function() {
            YT.loaded = 1;
            for (var i = 0; i < l.length; i++) {
                try {
                    l[i]();
                } catch (e) {}
            }
        };
        YT.setConfig = function(c) {
            for (var k in c) {
                if (c.hasOwnProperty(k)) {
                    YTConfig[k] = c[k];
                }
            }
        };
        /*
        var a = document.createElement('script');
        a.type = 'text/javascript';
        a.id = 'www-widgetapi-script';
        a.src = 'https://s.ytimg.com/yts/jsbin/www-widgetapi-vflJJaNgk/www-widgetapi.js';
        a.async = true;
        var c = document.currentScript;
        if (c) {
            var n = c.nonce || c.getAttribute('nonce');
            if (n) {
                a.setAttribute('nonce', n);
            }
        }
        var b = document.getElementsByTagName('script')[0];
        b.parentNode.insertBefore(a, b);
        */
    })();
}