html5 useful skills blogs
preload & prefetch
https://www.30secondsofcode.org/snippet/ary
blogs
https://alligator.io/html/preload-prefetch/
https://medium.com/reloading/preload-prefetch-and-priorities-in-chrome-776165961bbf
https://www.w3.org/TR/preload/
https://www.keycdn.com/blog/resource-hints
https://developer.mozilla.org/en-US/docs/Web/HTML/Preloading_content
https://www.smashingmagazine.com/2016/02/preload-what-is-it-good-for/
https://css-tricks.com/prefetching-preloading-prebrowsing/
https://love2dev.com/blog/prefetch-preload-prerender/
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