PWA Tutorial: Turn Your Website Into a Progressive Web App

Summary

Progressive web apps let websites provide app-like experiences, including home-screen installation, offline access, push notifications, and some device hardware APIs, without separate platform-specific code or app-store approval. This tutorial converts an existing site by adding a JSON manifest, linking it from the base HTML, creating an offline page, implementing a service worker, registering that worker, and deploying over HTTPS. The service worker precaches important routes during installation and handles fetches by serving network responses, caching them, or falling back to cached content and offline.html; the example uses the "offline" cache and includes routes such as /blog/, /contact, and /resume. It also covers installation through Safari and Chrome and notes that iOS does not support background sync.

Takeaways

1. 1

   The manifest defines installation metadata such as the app name, colors, scope, start URL, description, orientation, and home-screen icons.

2. 2

   The example service worker precaches /blog/, /blog, /, /contact, /resume, and /offline.html, then falls back to cached content or offline.html when a fetch cannot be satisfied.

3. 3

   The service worker file must be served from the same level as the manifest scope, and the site must be served over HTTPS for installation.