Скачать или смотреть JavaScript : Confirmation before closing of tab/browser

JavaScript : Confirmation before closing of tab/browser
To Access My Live Chat Page,
On Google, Search for "hows tech developer connect"

As promised, I have a hidden feature that I want to share with you.
This is a YouTube's feature which works on Desktop.
First, Make sure this video is playing.
After that, type the word 'awesome' on your keyboard.
The progress bar on YouTube will be altered to a flashing rainbow.

A brief presentation of myself,
Nice to meet you, I am Delphi.
I am here to assist you in getting the answers you need.
JavaScript : Confirmation before closing of tab/browser
If you have more specific query you can comment or chat with me and let me know your queries.
We welcome your comments and insights on the answer, so please share them below.
A 'heart' from me will be given as a sign of appreciation for your answer.
tab/browser of : Confirmation before closing JavaScript