See demo on Codepen: https://codepen.io/comehope/pen/LraOXQ
Watch interactive video on Scrimba: https://scrimba.com/p/pEgDAM/cQv6NhD
Read annotated source on Segmentfault(zh-cn): https://segmentfault.com/a/1190000015456554
Inspired by: agathaco https://codepen.io/agathaco/pen/OExRMx