Almost all of the major browser vendors allow users to pin or install your web app. So-called “stickyness” is a common argument for native apps but can be achieved with just a few tweaks to your markup.
Most browsers and devices have access to the user's geo-location. Learn how to work with the user's location in your site and apps.
On devices with phone capabilities, make it easy for users to directly connect with you by simply tapping a phone number, more commonly known as click to call.
Device motion and orientation events provide access to the built in accelerometer, gyroscope and compass in mobile devices.