Under the hood of MDN's new front end (developer.mozilla.org)

MDN explains the main architectural changes behind its rebuilt frontend, moving from a React-based “yari” app with heavy technical debt toward a setup that better matches how MDN content is built from Markdown into JSON and rendered via server-side rendering. The post details why the old approach made UI maintenance and interactivity difficult—especially when interactive elements inside mostly-static documentation needed to work without expensive client-side re-parsing. It highlights the use of Lit and web components (including a custom element for embedded Scrimba “Scrims”) to insert interactive features directly into content, reducing reliance on manual DOM code and improving maintainability.