Some of the useful APIs in HTML5 are :
Fetch : Fetch has made Http requests easier than it was with XMLHttpRequest.
Battery status : checks the battery status of the device.
Geolocation : tells the device location.
Clipboard : copy the contents to the clipboard.
Forms : new types have been added for validation and rendering.
Drag and drop : easily drag and drop items in the app.
Screen orientation : Checks the device’s screen orientation.
Web audio : Process audio on the client-side.
Internalization : International formatting and string comparison.
Web sockets : real-time communication between server and client.
