Users don’t expect janky scrolling or slow load performance. Making your site fast is a process that starts with understanding how RAIL affects the performance of your site and how to use that to measure and improve your performance.

• Critical Rendering Path
• Rendering Performance

User experiences on the web should feel like an integrated part of the user's device; instead of having to reach through a browser window, the experience should feel true to how the user interacts with the device.

• Get a place on the users home screen.
• Simplify payments with the Payment Request API.

Users don’t expect the web to work without a network connect, and often don’t even bother to try when it’s a slow or intermittent connection. We need to change that perception. The web must be reliable.

• Use the Offline Cookbook to improve reliablity.
• What should you consider when designing for slow or intermittent networks?

An engaging app goes beyond functional, but ensures that the whole experience is delightful making it easy for the user to do what they need to do. Using features like Web Push, it’s always up to date, and Notifications keeps users informed. It uses the right capabilities, at the right time, in a beautiful way.

• Use Web Push & Notifications to re-engage with users.
• Designing beautiful user experiences.