dns-prefetch/preconnect/prerender/prefetch/preload

learning mark

 

http://www.alloyteam.com/2016/05/preload-what-is-it-good-for-part1/

 

http://www.jianshu.com/p/24ffa6d45087

 

http://blog.csdn.net/franktaoge/article/details/51473823

 

https://www.w3cplus.com/performance/reloading/preload-prefetch-and-priorities-in-chrome.html