JavaScript : Set custom HTML5 required field validation message

JavaScript : Set custom HTML5 required field validation message
To Access My Live Chat Page,
On Google, Search for "hows tech developer connect"

As promised, I have a secret feature that I want to reveal to you.
This is a YouTube's feature which works on Desktop.
First, Make sure the video is currently in playing mode.
Then, type the letters 'awesome' on your keyboard as the next step.
The progress bar on YouTube will be altered to a flashing rainbow.

An introduction to myself in a few words,
Hi, my name is Delphi, nice to meet you.
I can help you find the answers you are looking for.
JavaScript : Set custom HTML5 required field validation message
I am available to answer your more specific queries, so feel free to comment or start a chat.
Don't hesitate to share your answer or insights on the answer by leaving a comment below.
Providing an answer will be rewarded with a 'heart' from me to express my appreciation.
field message custom Set required validation HTML5 JavaScript :