When I was a teenager we had the Living Books edition of
Arthur's Teacher Trouble on CD-ROM as part of a "multimedia kit". Every page had short animations that would play by clicking on random things with your cursor, in addition to following along with the story, clicking on single words to hear them pronounced and spelled, etc. It was incredible and paved the way for similar phenomena like clickable Easter eggs in Homestar Runner cartoons.
This reminded me of that.