See demo on Codepen: https://codepen.io/comehope/pen/QxbmxJ
Watch interractive video on Scrimba: https://scrimba.com/p/pEgDAM/cepNzTW
Read annotated source on Segmentfault(zh-cn): https://segmentfault.com/a/1190000015126240
Inspired by: yumeeeei https://codepen.io/yumeeeei/pen/BQPmpX