Type="submit" for button is superfluous?

Question

HTML

I need a button to submit form data to the server.
I understand correctly that this is the default value for the button tag, that is, I do not need to write: ?

Answer 1

According to the rules of good manners, one must either

<button type="submit" value="Send Request">Send Request</button>

Answer 2

Here is a brief description
https://developer.mozilla.org/ru/docs/Web/HTML/Ele...
There, in the attributes section, type is also described.
And there are links to the specification.