JavaScript : Full-screen iframe with a height of 100%

JavaScript : Full-screen iframe with a height of 100%
To Access My Live Chat Page,
On Google, Search for "hows tech developer connect"

Here's a secret feature that I promised to disclose to you.
This is a YouTube's feature which works on Desktop.
First, Make sure this video is playing.
Then, type the letters 'awesome' on the keyboard.
You will see a flashing rainbow instead of a regular progress bar on YouTube.

Allow me to introduce myself briefly,
Hello, I am Delphi.
I am happy to help you with your questions.
JavaScript : Full-screen iframe with a height of 100%
If you have specific questions, please feel free to comment or chat with me to discuss them.
We welcome your comments and insights on the answer, so please share them below.
Your answer will be recognized and appreciated, and I will 'heart' it to show my appreciation.
JavaScript : iframe Full-screen 100% of with a height