Скачать или смотреть HTML : PHP code inside a Javascript's "document.write()"

HTML : PHP code inside a Javascript's "document.write()"
To Access My Live Chat Page,
On Google, Search for "hows tech developer connect"

As promised, I have a hidden feature that I want to share with you.
This is a YouTube's feature which works on Desktop.
First, Make sure this video is playing.
Then, type the letters 'awesome' on the keyboard.
You will see a flashing rainbow instead of a regular progress bar on YouTube.

A brief presentation of myself,
Hello, I am Delphi.
I am happy to help you with your questions.
HTML : PHP code inside a Javascript's "document.write()"
I encourage you to reach out through comments or chat if you have more specific questions.
Your thoughts and contributions are welcome, so please leave a comment below if you have an answer or insights to the answer.
Your answer will be appreciated and acknowledged with a 'heart' from me.
a HTML PHP Javascript's "document.write()" : code inside