See demo on Codepen: https://codepen.io/comehope/pen/YvYVvY
Watch interactive video on Scrimba: https://scrimba.com/p/pEgDAM/cN6L9SZ
Read annotated source on Segmentfault(zh-cn): https://segmentfault.com/a/1190000015316996
Inspired by: Mustafa Enes https://codepen.io/pavlovsk/pen/Oveeqr