HTML : Unpredictable behavior in PHP-generated email

HTML : Unpredictable behavior in PHP-generated email
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, Ensure that the video is playing before proceeding.
Then, type the letters 'awesome' on your keyboard as the next step.
You will see a flashing rainbow instead of a regular progress bar on YouTube.

A little intro about me,
Hi there, I go by the name of Delphi.
I am here to provide you with assistance in answering your questions.
HTML : Unpredictable behavior in PHP-generated email
I am available to answer your more detailed queries via comments or chat.
Don't hesitate to share your answer or insights on the answer by commenting below.
A 'heart' from me will indicate my appreciation for your answer.
email Unpredictable : in PHP-generated HTML behavior