Great article with moving graphs and text (how is this done?)

I've not seen an article formatted like this before. It's a great way to explain the data.

A question for you web techies: how the heck did they do this?

It works well on mobiles too!

• Coronavirus data shows which countries have it under control. What did they do right? - ABC News (Australian Broadcasting Corporation)

from Great article with moving graphs and text (how is this done?)