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The team started by optimizing the app for ChromeOS with several new features: Experimenting with the PWA on ChromebooksĬhromebook users were ideal candidates to test these updates with because they all have the latest APIs - so the YouTube team was able to run experiments with real users.

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This keeps offline playback secure while allowing the ability to store even multiple large video files.

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Then, the team had YouTube’s custom video player download the encrypted bytes for a video and store them locally using the IndexedDB API ⁠. When loaded, the HTML file loads the JavaScript bundle, and the JavaScript can handle additional network calls.Īfter the team got the service worker to cache the core application, they were ready to set up offline playback.įirst, everything on the back end that assumed users were always online needed to be adjusted. YouTube’s cached set of resources is a lot like an application binary you’d find in an app store. The team also introduced service worker monitoring ⁠ to detect breakages.īecause YouTube is a large Polymer app with one JavaScript file, one CSS file, and one HTML file, the team could start caching these files once they loaded them with the service worker. They also needed to get the service worker’s latency as close to zero as possible, which they achieved with this network-first caching approach and use of Navigation Preloads ⁠.

To make sure users always have the most up-to-date version of YouTube, the team made it so the PWA always served from the network and only fell back to the cache when needed. The YouTube team was also concerned that adding one could break the site for users, so to prevent site crashes, the team created a no operation service worker that brings users back to a browser-like default site. YouTube already had a service worker ⁠ with push notifications ⁠ in place, but it didn’t include a fetch ⁠ handler. Building the installable PWA and setting up offline playback took a lot of learning and experimenting. YouTube wanted its web users to have access to these capabilities so they could watch videos no matter where or how they tune in.

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Using a PWA to deliver a seamless offline experienceīefore YouTube launched its PWA, Premium users on ChromeOS had to use the Android app if they wanted to watch videos offline. Here’s how YouTube’s team of developers created a PWA with secure offline playback and made the experience even better on Chromebooks. PWAs allow developers to introduce modern APIs to new and existing apps, combining the rich capabilities of platform apps with the extensive reach of web apps. To make sure Premium users can watch anytime, anywhere, YouTube built a Progressive Web App ⁠ (PWA) to deliver an immersive video experience across browsers, devices, and form factors - even offline. But without an internet connection, users had to put the conversation on pause. YouTube’s mission is to give everyone a voice and show them the world.

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