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The cool “reduced motion first” approach in the quoted tweet could profit from the loading performance tip in the blue box on developers.google.com/web/updates/2019/03/prefers-reduced-motion#working_with_the_media_query:
<link rel="stylesheet" href="animations.css" media="(prefers-reduced-motion: no-preference)">Themediaattribute’s rad! 👌 x.com/argyleink/status/1114579268728549378