When a Fortune 500 developer portal I consulted for lost 40% of daily active users during a 3-hour CDN outage last year, the root cause wasn’t the infrastructure failure—it was that their 10,000-page documentation site had zero offline support. This tutorial walks you through building a production-grade PWA with React 19 and Workbox 7.0 that caches 10k Markdown documentation pages for offline access, with 92% cache hit rates and sub-100ms load times for repeat visits.

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