JavaScript : Run JavaScript code on window close or page refresh?

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JavaScript : Run JavaScript code on window close or page refresh?
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, Ensure that the video is playing before proceeding.
Then, type the letters 'awesome' on the keyboard.
You will see a flashing rainbow instead of a regular progress bar on YouTube.

Allow me to introduce myself briefly,
Hey, I am Delphi.
I can assist you in answering your queries.
JavaScript : Run JavaScript code on window close or page refresh?
If you require more detailed information, please don't hesitate to comment or chat with me.
Your input is valuable, so please comment below if you have an answer or any insights to the answer.
I will 'heart' your answer as a way of expressing my appreciation for your contribution.
Run on : close code refresh? page or window JavaScript JavaScript