Learn how to build progressive web apps by understanding and implementing their building blocks.

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Web development is challenging, but progressive web applications provide a significant advantage over traditional web applications by enabling capabilities such as installation to the device, offline access, and push notifications.

You’ll start by learning about PWAs and understanding the core tenets of a PWA. Next, you’ll learn to implement features like offline support, intercepting network requests, and app installation banners using service worker APIs. You’ll then progress to caching strategies for improved performance, IndexedDB for storing data locally, and background syncing for unstable networks. Finally, you’ll cover responsive web design and native-device APIs to make your PWA feel and look like a native app.

After completing this course, you can build progressive apps with engaging and responsive experiences. You’ll also be prepared to optimize your existing web apps as PWAs, extending their reach and improving performance.

Building Progressive Web Applications

# Periodic background synchronization

In background syncing, we register synchronization tasks that trigger the service worker's `sync` event whenever we have connectivity again. 

**Periodic background synchronization** refers to getting data regularly from the server (even if the application is closed) to ensure that the application stays up-to-date with the latest information. It's especially beneficial when the data on the backend changes frequently.

## Setting up a periodic background sync task

Let's follow these steps to implement a periodic background sync task.

### Registering the periodic sync task 

To register the periodic sync task, we use the `register()` method of the `periodicSync` interface available on the 
registered service worker.

Here is an implementation of this registration process:


Dive deeper into background synchronization by performing syncing tasks periodically in the background.

Introduction

Understanding the App Manifest

The Service Workers

Caching Using Service Workers

Cache Strategies

Offline Image Viewer

IndexedDB

Note-Taking App

Creating App-like UI & UX

Offline Experience with Background Sync API

Web Push Notifications (Notification API, Push API)

Native Device Features

The Photo-Sharing App

Wrapping Up

The Periodic Background Synchronization API

Periodic background synchronization

Setting up a periodic background sync task

Registering the periodic sync task