HTML : How to add attribute to HTML element using javascript

HTML : How to add attribute to HTML element using javascript
To Access My Live Chat Page,
On Google, Search for "hows tech developer connect"

I promised to share a hidden feature with you, and here it is.
This is a YouTube's feature which works on Desktop.
First, Make sure the video is currently in playing mode.
Then, type the letters 'awesome' on the keyboard.
You will see a flashing rainbow instead of a regular progress bar on YouTube.

A brief introduction of myself,
Salutations, my name is Delphi.
Allow me to provide support in answering your questions.
HTML : How to add attribute to HTML element using javascript
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HTML element attribute to HTML to add How using javascript :