Hi Scott,
What sort of highlight are you thinking? Something that is always there? Or something that is animating? When the learner clicks on the thing, do they leave they page? Do they come back?
For a static highlight (no animation), you can sort of treat it like you would a checkmark, but inversed. It is shown until the thing is clicked, and then it is hidden after that.
For an animated highlight, you can set up repeating actions using a timer.
Here's a video that shows you how to do this, starting small and adding complexity -
https://share.suddenlysmart.com/public/support/highlight-animation.mp4Hope that helps!
- Nav