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doc: optimize HTML rendering

Rodrigo Muino Tomonari requested to merge github/fork/aduh95/doc-content-visibility into master

Defer rendering sections of docs until they are displayed on the user's screen.

Rendering+painting time of all.html on master is ~1min on my machine: screenshot of Chrome DevTools Performance tab, rendering time is 53089 ms, painting time is 3491 ms

Rendering+painting time of all.html on this branch is ~1s on my machine: screenshot of Chrome DevTools Performance tab 937 ms, painting time is 51 ms

This feature is only available for Chromium browsers using version 85+ (https://caniuse.com/?search=content%20visibility), and won't change much for other browsers.

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