client device ID

[Сергей Александрович]

I proceed from the assumption that when a client has registered in the system, he is alone at the computer or in his hands a mobile device. If the client leaves the personal account by selecting the exit option in the corresponding menu, then in this case the next login to the personal account must be with a login and password request. And if the client leaves the personal account by clicking on some link or as a result of an error or carelessness closing the browser, then in this case I would like to let him into the account without additional login-password requests.

I was interested in the option of saving data in the browser's local storage. Write in more detail how to do this.