The realtime website analytics site, Amung us shows this screen to their logged in users whenever they click external links to other sites via their dashboards/web application.
This is a usual “you are now leaving our site” full page screen that many uses to legally protect site owners and notify and remind the user as well.
They added a bouncing effect on the warning icon on the left and provided a 20 seconds countdown before they automatically redirect you to the target webpage. they also put their usual links on header for branding and then added social buttons on the footer of the page.
Posts Selected From the Category "Navigation Menus"
You will encounter this interface when you use a Sign-in with Google buttons and if you have a multiple account setup on your Google account. The interface is straight forward, you can pick from a list of your Gmail accounts that are linked together. This UI is also known as Multiple Accounts sign-in.