How to create a PDF that is editable in the browser?

Question

I stumbled upon a curious feature on a hosted PDF document, you can download a slice of the pdf here. Notice the buttons at the bottom, the red one cleans the page, and the blue one prints the document.

Here's a section of the PDF that has editable lines:

This document allows users to edit text directly within the browser. Not only can you type, but there are also some action buttons for clearing the page and printing the file. Overall it enables users to make changes to the document without needing any external software besides the browser (Chrome and Firefox).

What kind of technology is being used for this? How could I create such a PDF with editable text and action buttons?

Thank you!