How to transfer data from one tab to another?

Question

JavaScript

Good afternoon, ladies and gentlemen. Need help. The client has 2 tabs open in the store, one with selected products, the other with a product catalog. When you click on a product, it goes to your favorites. How can I parse the product that the client added immediately. So that when switching the tab to favorites, the client has already seen the product that he has chosen?
The work takes place with three front-end pillars. No frameworks.

Answer 1

window.postMessage
websockets
localStorage events

Answer 2

When adding a product to favorites or a shopping cart, we write in localStorage the time of such addition and information about the product.
"Favorites" listens to the storage event , and if there is a fresh label in it, it will be updated.