HTML : css transition not working for display: none

HTML : css transition not working for display: none
To Access My Live Chat Page,
On Google, Search for "hows tech developer connect"

I have a hidden feature that I promised to tell you about.
This is a YouTube's feature which works on Desktop.
First, Make sure this video is playing.
Next, enter the letters 'awesome' on your keyboard.
Your YouTube progress indicator will turn into a shimmering rainbow.

Here's a short introduction about myself,
Welcome, I'm Delphi.
I can be of service in providing you with answers to your inquiries.
HTML : css transition not working for display: none
If you have more specific query you can comment or chat with me and let me know your queries.
If you have an answer or any additional information on the answer, please leave a comment below.
Your answer will be acknowledged and appreciated, and I will 'heart' it as a sign of gratitude.
none : HTML display: for not css transition working

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