Improving site performance by shipping more CSS
First reported · 29d ago · 1 source
Crest summary — written by AI from the 1 source below; every figure is checked against them · model deepseek-chat
Summary
GitHub has fully migrated github.com away from CSS-in-JS, a change the company describes as improving site performance.
Key facts
- GitHub migrated github.com away from CSS-in-JS.
- The change was announced on the GitHub Blog on 2026-09-25.
- GitHub frames the migration as improving site performance.
Why it matters
Teams building or maintaining web front ends get a documented case of a large site dropping CSS-in-JS for plain CSS, which may inform their own styling and performance choices.
Companies
Technologies
- CSSlanguage
- CSS-in-JSframework
Related on Crest
Matched by rule, not by AI: a repository linked in the coverage, or a technology or company in this event that Crest tracks.
Packages
- @seed-design/cssCSS implementation of Seed Design, providing design tokens and component styles and theming codes.Matches a named technology
- @vanilla-extract/cssZero-runtime Stylesheets-in-TypeScriptMatches a named technology
- @ant-design/cssinjsComponent level cssinjs resolution for antdMatches a named technology
- @compiled/cssA familiar and performant compile time CSS-in-JS library for React.Matches a named technology
Original sources (1)
The report this event was built from. Crest of Tech keeps no article bodies: the full text is at each source.
- GitHub BlogOfficial · PrimaryImproving site performance by shipping more CSS · By Josh BlackRead at GitHub Blog