(function (win, doc) {

    var removeLink = function removeLink(event) {
        if (event.type === 'error')
            console.warn(event.target.href + 'could not be loaded!');

        doc.head.removeChild(event.target);
    }

    var createLink = function createLink(type, addr, attrs) {
        var link = doc.createElement('link');
        link.rel = type;
        link.href = addr;
        link.onload = removeLink;
        link.onerror = removeLink;
        for (var attr in attrs)
            link[attr] = attrs[attr];

        doc.head.appendChild(link);
    }

    win.makeHint = function hint(addr, type, attrs) {
        if (typeof addr === 'string') {
            createLink(addr, type, attrs);
        }
        else if (addr instanceof Array) {
            addr.forEach(function (addr) {
                createLink(addr, type, attrs);
            });
        }
    }

    win.prefetchDns = makeHint.bind(null, 'dns-prefetch' /* addr, attrs */);
    win.preconnect = makeHint.bind(null, 'preconnect' /* addr, attrs */);
    win.prefetch = makeHint.bind(null, 'prefetch' /* addr, attrs */);
    win.prerender = makeHint.bind(null, 'prerender' /* addr, attrs */);


}(window, document));