Build PWAs with offline support, push notifications, and responsive design. Learn service workers, caching, and optimization for native-like experiences.

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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

# Introduction

The MediaStream API provides access to audio and video streams from webcams and microphones. It allows capturing, recording, and manipulating these streams in real time.

This API can be useful in the following ways:

- Capturing pictures
- Scanning QR codes
- Video chatting 
- Real-time video effects
- Audio-video recording

# Capturing media streams

We capture a media stream by calling the `navigator.mediaDevices.getUserMedia()` or `navigator.mediaDevices.getDisplayMedia()` method.

This will prompt the user for permission to access their webcam and/or microphone. Once granted, it returns a `MediaStream` object containing `MediaStreamTrack` objects for each audio/video source.

For example, to capture video from the webcam, we add the following code:


Explore the MediaStream API provided by the Web to access the inputs from various media hardware.

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

Learn to Localize a React Web App Using React Intl

The MediaStream API

Introduction

Capturing media streams