This API is available on Firefox OS for internal applications only.
Summary
The onstkcommand property specifies an event listener to receive stkcommand events. These events are notified whenever STK Proactive Command is issued from ICC.
Note: MozIccManager inherits from the EventTarget interface, so it's also possible to listen for events by using the addEventListener() method.
Syntax
navigator.mozMobileConnection.icc.onstkcommand = funcRef;
Where funcRef is a function to be called when the stkcommand event occurs.
Specification
Not part of any specification.