HTML : How to target body in javascript DOM event

HTML : How to target body in javascript DOM event
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I promised to share a hidden feature with you, and here it is.
This is a YouTube's feature which works on Desktop.
First, Ensure that the video is playing before proceeding.
After that, type the word 'awesome' on your keyboard.
You will see a flashing rainbow instead of a regular progress bar on YouTube.

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I am at your disposal to help you with any questions you have.
HTML : How to target body in javascript DOM event
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