This is the exact use case for sessionStorage or a cookie with expires=0. But correct usage depends on the knowledge & goodwill of website authors. For privacy

This is the exact use case for sessionStorage or a cookie with expires=0. But correct usage depends on the knowledge & goodwill of website authors. For privacy purposes, Incognito mode achieves the same effect without any of the hassle. Maybe turning off cookies should not even be an option anymore?