Storyline Resume feature: Does it use cookies or something else to remember?

I have a course with one main screen and several layers, with drag/drop buttons. You drag to button to another box, click play, and a video plays. Once it's done, click on "Go Back" and it takes you back to the main page.

My question is, if a user visits a few videos, closes the course, comes back and resumes where they left off, will it remember that they have visited those videos?

If so, what if they delete cookies on their browser? Does the Resume feature use cookies or something else to remember?

Thanks!

 

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