I designed this simple graph including the timing. I also wrote the JavaScript (a painstaking process for me). Inspired by Ben De Cock to use requestAnimationFrame for the animation. See the Pen <a href='https://codepen.io/nelsonJM/pen/XeZZgy/'>requestAnimationFrame example</a> by Josh Nelson (<a href='https://codepen.io/nelsonJM'>@nelsonJM</a>) on <a href='https://codepen.io'>CodePen</a>.