Thanks for taking the time to feedback. Since I started doing this in my retirement as a distraction, I had to pick a specific engine to learn and most recently settled on UE. After about two yrs of playing around, and w/UE5 my old laptop was struggling with most things. Then found I could add a minimal install of 'Deprecated' ver. UE 4.23 (Installing only the HTML5 packaging) and now I can learn how to make / produce WebGL without having to start learning another engine.