Testing: “Progressive Web Applications Constraints”

Progressive web applications offer a great deal of value and can be a really great experience, but there are a few technical constraints that you need to be aware of. There are 2 main ways to detect whether a browser is capable of understanding a PWA: Determine if the browser supports the Service Worker API: if (‘serviceWorker’ in navigator) { // Browser supports Service Workers // … } Determine if the browser supports the Cache API: if (‘caches’ in window) { // Browser supports the Cache API // … } If the browser does not support the Cache API, then it is not able to cache your service worker and, therefore, is not able to support a PWA. If the browser does not support the Service Worker API, then it is not able to install your service worker and, therefore, is not able to support a PWA.

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