StyleX, facebook.com ’s CSS-in-JS library, also presented at React Finland 2021, falls in the static CSS-in-JS category. Some of the libraries under study are framework-agnostic.

CSS-in-JS refers to a pattern where CSS rules are produced through JavaScript instead of defined in external CSS files. Two sub-patterns coexist.

Google's John Mueller and Martin Splitt spoke for just under 40 minutes on the topic of CSS and SEO. They covered why CSS ...