jQuery : How to extend an existing jQuery UI widget?

jQuery : How to extend an existing jQuery UI widget?
To Access My Live Chat Page,
On Google, Search for "hows tech developer connect"

As I promised, I have a secret feature 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.
You will see a flashing rainbow instead of a regular progress bar on YouTube.

A short overview of who I am,
Hello there, my name is Delphi.
Let me aid you in resolving any queries you may have.
jQuery : How to extend an existing jQuery UI widget?
Let me know if you have more specific questions or concerns by leaving a comment or starting a chat.
Please feel free to share your answer or insights on the answer by leaving a comment below.
Your answer will be recognized and appreciated, and I will 'heart' it to show my appreciation.
extend How jQuery to widget? an existing jQuery : UI