1 position:sticky ---------------------》 https://www.zhangxinxu.com/wordpress/2018/12/css-position-sticky/
2 ex 与 x-height ---------------------》 https://www.zhangxinxu.com/wordpress/2015/06/about-letter-x-of-css/
3 CSS4 color-adjust ----------------》https://www.zhangxinxu.com/wordpress/2018/11/css4-color-adjust/
4 flex-shrink
5 css3 的 Scroll Snap -----------》 https://www.zhangxinxu.com/wordpress/2018/11/know-css-scroll-snap/
6 CSS3原生变量var ---------------》https://www.zhangxinxu.com/wordpress/2016/11/css-css3-variables-var/
https://www.zhangxinxu.com/wordpress/2018/11/css-background-color-font-auto-match/
7 HTML5 video视频播放Picture-in-Picture画中画技术
8 https://zhuanlan.zhihu.com/luckyabby
9 朴灵与阮一峰的对js运行机制的理解冲突 https://blog.csdn.net/lin_credible/article/details/40143961