See demo on Codepen: https://codepen.io/comehope/pen/deNqdV
Watch interactive screencast on Scrimba: https://scrimba.com/p/pEgDAM/cvrwJAK
Read annotated source on Segmentfault(zh-cn): https://segmentfault.com/a/1190000014669547
Inspired by: Arthur Camara https://codepen.io/arthurcamara1/pen/MvgeRZ