Checks if on-screen keyboards are supported.
Returns true if the platform supports on-screen keyboards.
Universal Windows Platform:On Windows Store Apps, this value is always true even if on-screen keyboards aren't supported. The on-screen keyboard may or may not appear depending on the device and configuration of Windows. The OS will only display the on-screen keyboard when it’s necessary.
Web:On the Web platform, this value is always true even if on-screen keyboards aren't supported. The on-screen keyboard may or may not appear depending on the device and OS configuration.