103 Early Hints
https://blog.jxck.io/entries/2016-12-16/103-early-hints.html
https://speakerdeck.com/narirou/webpahuomansugao-su-hua-tokorekaranoakitekutiya?slide=35
https://calendar.perfplanet.com/2022/web-performance-apis-appreciation-post/#:~:text=70.16%%20adoption-,103%20Early%20Hints,-103%20Early%20Hints