Pausable looping video in an Astro blog — WCAG 2.2.2 rules out GIF, iOS rules out VP9
A GIF cannot be paused, so WCAG 2.2.2 ruled it out. MP4 then beat the smaller VP9 on iOS hardware decode. The encode recipe, the guards, and the tests.
iOS
An Astro service worker that keeps the pages you read offline — a 205KB shell and a 50-page cap
A service worker for an Astro blog that precaches 205KB of site-wide CSS and JS, keeps each article as it is read up to 50, and caches figure styles on demand.