Progressive web applications
While web applications have been available for mobile devices from the start, they have generally been slower, have had fewer features, and been less used than native apps. But with the ability to work offline, previously only available to native apps, PWAs running on mobile devices can perform much faster and provide more features, closing the gap with native apps, in addition to being portable across both desktop and mobile platforms.
PWAs do not require separate bundling or distribution. Publication of a progressive web app is as it would be for any other web page. PWAs work in any browser, but "app-like" features such as being independent of connectivity, install to home screen, and push messaging depend on browser support. As of April 2018, those features are supported to varying degrees by the Microsoft Edge, Google Chrome, Mozilla Firefox and Apple Safari browsers, but more browsers may support the features needed in the future. Several businesses highlight significant improvements in a wide variety of KPIs after PWA implementation, like increased time spent on page, conversions, or revenue.
At the launch of the iPhone in 2007, Steve Jobs announced that web apps, developed in HTML5 using AJAX architecture, would be the standard format for iPhone apps. No SDK was required, and the apps would be fully integrated into the device through the Safari browser engine. This model was later switched for the App Store, as a means of preventing jailbreakers and of appeasing frustrated developers. In October 2007 Jobs announced that an SDK would be launched the following year. As a result, although Apple continued to support webapps, PWA compatibility for iOS was significantly reduced.
Firefox released Firefox OS in 2013. It was intended to be an open-source operating system for running webapps as native apps on mobile devices, with Gaia built as its HTML5 interface. The development of Firefox OS ended in 2016.
In 2015, designer Frances Berriman and Google Chrome engineer Alex Russell coined the term "progressive web apps" to describe apps taking advantage of new features supported by modern browsers, including service workers and web app manifests, that let users upgrade web apps to progressive web applications in their native operating system (OS). Google then put significant efforts into promoting PWA development for Android. With Apple's introduction of service worker support for Safari in 2017, PWAs were now supported on the two most commonly-used mobile operating systems, Android and iOS.
By 2019, PWAs were available on desktop browsers Microsoft Edge (on Windows) and Google Chrome (on Windows, macOS, Chrome OS and Linux). PWAs have been widely adopted throughout the industry. Advantages included faster load times compared with previous web applications, smaller application sizes, and higher audience engagement.
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- Twitter Lite — Started off as web application intended for mobile devices in April 2017 and since July 2019 the only method to access Twitter while logged in, optional until June 2019.
- The legacy Twitter desktop website (still accessible while logged out, as of 2019-08-24) allows navigating through tweets without reloading the entire page or re-rendering the page elements (but not profile links or notifications), despite of being a HTML-based website, not a progressive web application.
- Dailymotion.com website since 2017 or 2018.
Progressive web apps are designed to work on any browser that is compliant with web standards. As with other cross-platform solutions, the goal is to help developers build cross-platform apps more easily than they would with native apps. According to Google Developers, the characteristics of a PWA are:
- Progressive — Works for every user, regardless of browser choice, using progressive enhancement principles.
- Responsive — Fits any form factor: desktop, mobile, tablet, or forms yet to emerge.
- Faster after initial loading - After the initial loading has finished, the same content and page elements do not have to be re-downloaded each time.
- Ordinary websites often already made use of the browser cache to avoid re-downloading the same data redundantly.[further explanation needed] But on progressive web applications, the same elements do not need to be re-rendered again.
- Connectivity independent — Service workers allow offline uses, or on low quality networks.
- App-like — Feels like an app to the user with app-style interactions and navigation.
- Fresh — Always up-to-date due to the service worker update process.
- Safe — Served via HTTPS to prevent snooping and ensure content hasn't been tampered with.
- Discoverable — Identifiable as an “application” by manifest.json and service worker registration, and discoverable by search engines.
- Re-engageable — Ability to use push notifications to maintain engagement with the user.
- Installable — Provides homescreen icons without the use of an App Store.
- Linkable — Can easily be shared via a URL, and does not require complex installation.
The technical baseline criteria for a site to be considered a progressive web app by browsers were described by Russell in a follow-up post:
- Originate from a secure origin. Served over TLS and green padlock displays (no active mixed content).
- Load while offline (even if only a custom offline page). By implication, this means that progressive web apps require service workers.
- Reference a web app manifest with at least the four key properties: name, short_name, start_url, and display (with a value of standalone or fullscreen)
- An icon at least 144×144 large in PNG format.
- Use of vector graphics that are indefinitely scaleable and require smaller filesizes.
Some progressive web apps use an architectural approach called the App Shell Model. In this model, service workers store the Basic User Interface or "shell" of the responsive web design web application in the browser's offline cache. This model allows for PWAs to maintain native-like use with or without web connectivity. This can improve loading time, by providing an initial static frame, a layout or architecture into which content can be loaded progressively as well as dynamically.
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- Web archival becomes much harder and faces problems.
- Longer initial loading times, because not just a single page needs to be loaded, but an entire web application.
- Compatibility issues in legacy systems.
The web app manifest is a W3C specification defining a JSON-based manifest (usually labelled manifest.json) to provide developers a centralized place to put metadata associated with a web application including:
- The name of the web application
- Links to the web app icons or image objects
- The preferred URL to launch or open the web app
- The web app configuration data
- Default orientation of the web app
- The option to set the display mode, e.g. full screen
This metadata is crucial for an app to be added to a home screen or otherwise listed alongside native apps.
iOS Safari does not implement manifests, but most of the PWA metadata can be defined via Apple-specific extensions to the meta tags. These tags allow developers to enable full-screen display, define icons and splash screens, and specify a name for the application. The APIs for new technologies also lagged behind Google's Android WebView implementation, although iOS 12.2 and 13 has caught up somewhat.
Service workers go through a three-step lifecycle of Registration, Installation and Activation. Registration involves telling the browser the location of the service worker in preparation for installation. Installation occurs when there is no service worker installed in the browser for the webapp, or if there is an update to the service worker. Activation occurs when all of the PWAs pages are closed, so that there is no conflict between the previous version and the updated one. The lifecycle also helps maintain consistency when switching among versions of service worker since only a single service worker can be active for a domain.
Technically, service workers provide a scriptable network proxy in the web browser to manage the web/HTTP requests programmatically. The service workers lie between the network and device to supply the content. They are capable of using the cache mechanisms efficiently and allow error-free behavior during offline periods.
Web Storage is a W3C standard API that enables key-value storage in modern browsers. The API consists of two objects, sessionStorage (that enables session-only storage that gets wiped upon browser session end) and localStorage (that enables storage that persists across sessions).
Indexed Database API is a W3C standard API for interacting with a NoSQL database. The API is supported by modern browsers and enables storage of JSON objects and any structures representable as a string. It is most commonly used with the idb wrapper around it.
Some other database libraries that can be used with PWAs include:
- RxDB - Build on top of PouchDB, this database offers functional-reactive capabilities to applications.
- GunDB - A graph based data storage system that relies on IndexedDB.
- Hood.ie - A library that allows data storage without a database or backend.
Application Cache (or AppCache or HTML5 cache manifest) is an earlier technology that allowed the application to cache content in advance for later use when the device is offline. It works adequately for single-page applications which it was designed for, but fails in problematic ways for multi-page applications like wikis. As of May 2019, the technology is supported by major browsers and in use for years by some sites, but it is already deprecated in favor of service workers and will eventually be removed.
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