I'm taking the Calculus course and on page one, there are multiple illustrations of what's being talked about with interactive buttons and all that, but the whole thing is broken and when the interactive sliders do appear they don't change anything that's being displayed. I encountered it first on Chrome, and then switched to Brave browser and it's the same exact problem.
You will have to provide much more detail. What is the name of the book? A screenshot would be helpful.