Touch actions allow a developer to define how a user can interact with an element and Chrome now has wider support for touch-action options in Chrome 55.
You can now access the options used when subscribing a user to push.
Web push has had a few updates in recent versions of Chrome. GCM now supports the web push protocol and if you use VAPID you won't need to sign up for a Google Developer Project and you'll be given an FCM endpoint.
Scroll anchoring stops a web page from moving once you've started reading the content.
Application shell architecture is a method of building progressive web apps today, taking advantage of a range of technologies.
Two new API's have been added in Chrome 44 which makes using Notifications with push easier to work with and customize.
The support for cut and copy commands allows you to programmatically cut and copy selected text to the users clipboard.
The Permissions API gives you a central place to check the permission status of an API.
Push Messaging and Notifications are Landing in Chrome 42.
The virtual viewport separates layout and viewing of the viewport.
TouchEvents have changed in Chrome to return float values, instead of integers, to account for varying screen densities. This leads to more detailed feedback during slow gestures.