Live/interactive elements in browser tab bars

I saw another interesting example of an interactive/live UI element in browser tab bars recently, this time it is a %scrolled value for a page.

A very popular and common example I have seen previously was the number of unread emails displayed for mail applications running in a browser (e.g. Gmail).

Is there a term used for these type of UI elements specifically designed for the browser tab? The term favicon was used specifically for the browser tabs, so I wonder if the same applies to UI elements of this type.