Learn JavaScript from Scratch JavaScript for Everyone - When the Page is Refreshed

The video tutorial explains the use of the 'beforeunload' event in web browsers, which prompts users with a confirmation dialog when they attempt to leave a page. It covers how to implement this event using JavaScript, discusses its limitations, and provides practical applications such as tracking user progress in a video player. The tutorial also includes a hands-on exercise to help viewers practice implementing and testing the 'beforeunload' event.

What is the purpose of the 'window.onbeforeunload' event in JavaScript?

How can you prevent a user from leaving a page without saving their work?

What limitations do modern browsers impose on custom messages in the 'before unload' event?

Describe a scenario where the 'before unload' event can be particularly useful.

What should you do in your code to implement the 'before unload' event correctly?