HTML : Use javascript to change text only in an element

HTML : Use javascript to change text only in an element
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.
Next, enter the letters 'awesome' on your keyboard.
Your YouTube progress indicator will turn into a shimmering rainbow.

A little intro about me,
Hello everyone, I'm Delphi.
I can assist you in answering your queries.
HTML : Use javascript to change text only in an element
I am available to answer your more detailed queries via comments or chat.
Please feel free to leave a comment below if you have an answer or insights on the answer.
I will express my appreciation for your answer by 'hearting' it.
to : only HTML javascript Use in an change text element