HTML : Does HTML5 require an action attribute for forms?

HTML : Does HTML5 require an action attribute for forms?
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, Ensure that the video is playing before proceeding.
Then, type the letters 'awesome' on the keyboard.
You will see a flashing rainbow instead of a regular progress bar on YouTube.

A little intro about me,
Hello, I am Delphi.
I am willing to help you find the solutions to your questions.
HTML : Does HTML5 require an action attribute for forms?
I welcome your comments and chats if you have more detailed queries.
If you have additional information or an answer to contribute, please feel free to comment below.
Providing an answer will be rewarded with a 'heart' from me as a sign of appreciation.
forms? : require attribute an HTML5 Does action for HTML