Discover how to build Progressive Web Apps with offline support, push notifications, responsive design, and native-like experiences. Gain insights into service workers, caching strategies, and app optimization.

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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

# Background

It's essential to ensure that web applications are optimized for all devices as the usage of mobile devices increases. That's why responsive designs are important. **Responsive designs** refer to designing websites and applications to provide the best possible user experience across all devices, from desktops to smartphones. Progressive web apps (PWAs) are no exception, and incorporating responsive designs into PWAs is essential to provide a consistent user experience across all devices.

PWAs are web applications that combine the best of both worlds: the capabilities of a native app with the convenience of a web application. PWAs provide an app-like experience to users with features such as offline access, push notifications, and full-screen mode. However, unlike native apps, PWAs are accessed through a web browser and do not need to be downloaded from an app store.

# How to create responsive web apps

Here are a few ways to make a PWA responsive.

## Using a mobile-first approach

A **mobile-first** approach involves designing the PWA with mobile devices in mind by starting with a design optimized for smaller screens and then adapting it for larger screens. This ensures the PWA is easy to use and looks great on any device.

For this purpose, HTML5's semantic markup tags can be used to create a well-structured document, while CSS media queries can be used to define styles for different viewport sizes.

## Using a responsive layout

A **responsive layout** adjusts the size and placement of elements on a page based on the device it's being viewed on. This ensures the page looks good and is easy to use on any device. 

This can be achieved using flexible grid layouts like CSS Flexbox or Grid. We can also use responsive design frameworks like Bootstrap, responsive units of CSS like `em` and `rem`, and viewport units like `vw` and `vh`.


Learn what a responsive design is and why it's important for web apps.

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 and UX

Offline Experience with Background Sync API

Web Push Notifications (Notification API, Push API)

Native Device Features

The Photo-Sharing App

Wrapping Up

Responsive Design

Background