Progressive Web Apps - Google's Concept of fast, reliable and engaging app-like experience via mobile browser

Progressive Web Apps blur the line between Web content and apps, but they keep the strengths of the Web.
Progressive Web Apps (PWAs) are designed to load “instantly.”
PWAs save an entire web page to a user’s local storage and place it in an app shell. The content is only updated as needed. A“Service Worker” serves all CSS stylesheets, images, JavaScript, pages, etc. Because most everything needed to render a page is stored locally, it delivers blazing fast performance.
It will also work offline, utilizing cached data saved from previous online activity. PWAs may ultimately replace the current generation of mobile websites. Progressive Web App Checklist

Progressive Web Apps will now appear in the app drawer section of the launcher and in Android Settings, and will be able to receive incoming intents from other apps. Long presses on their notifications will also reveal the normal Android notification management controls rather than the notification management controls for Chrome.

This new Add to Home screen feature is one more step in our journey to empower developers to build the best possible experience for their users, and we are committed to ensuring the same mechanisms for installing Progressive Web Apps are available to all browsers on Android.

The new Add to Home screen feature will be coming with Chrome 57. Another feature specific to Android in that version is the new Media Session API that allows developers to customize the lock screen UI and notifications. Specifically, media notifications can include title, artist, album name, and artwork, as well as actions like seeking and skipping.

On other platforms, CSS Grid Layout support gives developers more granular control over how elements grow and shrink to fit the current screen size. The two-dimensional grid-based layout system is optimized for responsive user interface design and makes layout code easier to understand.