progressive-web-app
Progressive Web Apps (PWAs)
Overview
A Progressive Web App is a web application that uses modern browser capabilities to deliver a fast, reliable, and installable experience — even on unreliable networks. The three required pillars are:
- HTTPS — Required in production for service workers to register (localhost is exempt for development).
- Web App Manifest (
manifest.json) — Makes the app installable and defines its appearance on device home screens. - Service Worker (
sw.js) — A background script that intercepts network requests, manages caches, and enables offline functionality.
When to Use This Skill
- Use when the user wants their web app to work offline or on unreliable networks.
- Use when building a mobile-first web project where users should be able to install the app to their home screen.
- Use when the user asks about caching strategies, service workers, or improving web app performance and resilience.
- Use when the user mentions Workbox, web app manifests, background sync, or push notifications for the web.
- Use when the user asks "can my website be installed like an app?" or "how do I make my site work offline?" — even if they don't use the word PWA.
Deliverables Checklist
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