HTML : Validation error: Byte-Order Mark found in UTF-8 File

HTML : Validation error: Byte-Order Mark found in UTF-8 File
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, Make sure this video is playing.
After that, type the word 'awesome' on your keyboard.
It will change your youtube progress bar into a flashing rainbow.

Allow me to introduce myself briefly,
Hello, I am Delphi.
Allow me to provide support in answering your questions.
HTML : Validation error: Byte-Order Mark found in UTF-8 File
If you require more detailed information, please don't hesitate to comment or chat with me.
If you have additional information or an answer to share, please comment below.
Your answer will be recognized and valued, and I will 'heart' it to show my appreciation.
UTF-8 Byte-Order in Mark File error: : found HTML Validation