Progressively enhance your Progressive Web App

Progressively enhance your Progressive Web App

The new standard includes promises, modules, classes, template literals, arrow functions, let and const, default parameters, generators, the destructuring assignment, rest and spread.

Back in March 2003, Nick Finck and Steve Champeon stunned the web design world with the concept of progressive enhancement, a strategy for web design that emphasizes loading core web page content first, and that then progressively adds more nuanced and technically rigorous layers of presentation and features on top of the content. While in 2003, progressive enhancement was about using—at the time—modern CSS features, unobtrusive JavaScript, and even just Scalable Vector Graphics. Progressive enhancement in 2020 and beyond is about using modern browser capabilities.

Inclusive web design for the future with progressive enhancement. Title slide from Finck and Champeon's original presentation.

Modern JavaScript #

Speaking of JavaScript, the browser support situation for the latest core ES 2015 JavaScript features is great. The new standard includes promises, modules, classes, template literals, arrow functions, let and const, default parameters, generators, the destructuring assignment, rest and spread, Map/SetWeakMap/WeakSet, and many more. All are supported.

The CanIUse support table for ES6 features showing support across all major browsers.The ECMAScript 2015 (ES6) browser support table. (Source)

Async functions, an ES 2017 feature and one of my personal favorites, can be used in all major browsers. The async and await keywords enable asynchronous, promise-based behavior to be written in a cleaner style, avoiding the need to explicitly configure promise chains.

progressive web app

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