Inspects the given text and identifies the prevailing emotional opinion within the text, especially to determine a writer's attitude as positive, negative, or neutral.

Find out the current light level or illuminance of the ambient light around the user's device.

Play audio, add effects to audio, create audio visualizations, apply spatial effects (such as panning) and much more.

Provide physical feedback to the user by causing the device to shake.

The Push API gives web applications the ability to receive messages pushed to them from a server, whether or not the web app is in the foreground, or even currently loaded. This lets developers deliver asynchronous notifications and updates to users that opt in, resulting in better engagement with timely new content.