scrolling document title when it longer than browser tab width.

scroll_document_title.js

(function (doc) {
    var origin_title = doc.title;
    setInterval(function() {
        doc.title = doc.title.length <= 15 
            ? origin_title 
            : doc.title.slice(1, 1) + doc.title.slice(1, doc.title.length + 1);
    }, 300);
})(document);