I have been thinking that I should have the above in future slides.com/erikchampion/ presentations.What to use? Inside slides.com you can use code (frames etc) so why not try:
Smoothly animate thousands of points with HTML5 Canvas and D3
Peter Beshai (16 Mar 2017 blog post)
https://bocoup.com/blog/smoothly-animate-thousands-of-points-with-html5-canvas-and-d3
Erik Champion 