How to implement an action when hovering over a browser tab with the cursor?

Question

JavaScript

Interested in the question of how, when hovering over the lord of the browser with the cursor, to carry out any action on js?
Also interested in cross-browser and cross-platform options

Answer 1

There is no tab hover event in js. You can use a hack to determine when the cursor will be hovered on the very top of the document (page)
output.jsbin.com/gawobofuge/4

Answer 2

no way

Answer 3

the only thing that can be caught is the cursor leaving the < html >