What is this form of using js called?

Question

HTML

What is the name of this kind of using js code?
<a href="javascript:functionName('parametr')"></a>
I would like to learn more about how it works and how it can still be used in this form.

Answer 1

Declarative. It's not clear from your question what you want to know :)

Answer 2

this form is called "hell for the person who then maintains the code"