How can I get a text outline effect on the web?

I am making a web app and want to get this kind of outline effect dynamically.

I don’t quite know how to describe it properly, but the outlines and the insides of the text are colored in.

My initial thought was that this would have something to do with text-stroke and the Canvas API, but I’m a bit out of my depth here. I’m open to any method!

Thank you!