A sample web app that lets you tune a guitar. It uses ES6 classes (via Babel) and Polymer.
The app was converted to Polymer 3 in early 2019 to keep up with new Chrome APIs. The first blow was the mandatory user interaction before user media is requested. Then came the impending removal of HTML Imports, document.registerElement and Element.createShadowRoot.
You can see the old (by now broken) app here, and the new one here.
Future development should bring the service worker back.
Copyright 2015 Google, Inc.
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Please note: this is not a Google product