See demo on Codepen: https://codepen.io/comehope/pen/oybWBy
Watch interractive video on Scrimba: https://scrimba.com/p/pEgDAM/cG64puy
Read annotated source on Segmentfault(zh-cn): https://segmentfault.com/a/1190000015157160
Inspired by: Jhey https://codepen.io/jh3y/pen/xjjYzW