& analytics, Push Notifications, Picasa API, a11y, ES6, <meta name=“theme-color”>, app HTML Imports, install banner, Polymer, <template>, Google Sheets API , Google Sign-in 2.0, Google Drive API , WebGL, Web Audio API, Web Worker, Google Cloud Messaging, App Engine, YouTube, material design, Sass, Promises, Gulp, Go , Web Animations API, Vulcanize, Google Web Components, Web Starter Kit, Add to Homescreen, <canvas> I/O web app specs