HTML : Use JavaScript to allow only specific characters in HTML input

HTML : Use JavaScript to allow only specific characters in HTML input
To Access My Live Chat Page,
On Google, Search for "hows tech developer connect"

I promised to reveal a secret feature to you, and now it's time to share it.
This is a YouTube's feature which works on Desktop.
First, Make sure the video is currently in playing mode.
After that, type the word 'awesome' on your keyboard.
Your YouTube progress bar will transform into a flashing rainbow.

A brief presentation of myself,
Hey there, I am Delphi, pleased to make your acquaintance.
I am here to aid you in getting answers to your questions.
HTML : Use JavaScript to allow only specific characters in HTML input
I encourage you to reach out through comments or chat if you have more specific questions.
Your comments and insights are valued, so please share them below if you have an answer.
Your answer will be recognized and valued, and I will 'heart' it to show my appreciation.
allow HTML in Use : HTML input to characters specific only JavaScript