How to insert text into a field?

Question

JavaScript

I made a small browser extension with a context menu.
When you click on a menu item, a pre-prepared text should be inserted into the form.
Those. It should work as if the user will paste the text from the clipboard, but it is the pre-prepared text that is inserted.
Question: How to implement such an insertion of text?

Answer 1

madapaja.github.io/jquery.selection