Sites look better on your tabs when you have a Favicon. If you don’t know what a favicon is, it’s the small icon that appears on the tabs of your web browser. Long time ago, favicons were a bit limited to images, but now we can do much more than that.
Favicon.js is a great script that will help you create favicon badges, just like an iPhone icon badge. But they went further, now you can add video to your icon and more.