The forEach() method of the MediaKeyStatusMap interface calls callback once for each key-value pair in the status map, in insertion order. If an argument is present it will be passed to the callback.
forEach(callbackFn)
forEach(callbackFn, thisArg)callbackFnFunction to execute for each element, taking three arguments:
currentValueThe current element being processed in the array.
index OptionalThe index of the current element being processed in the array.
array OptionalWhich array forEach() is being applied to.
thisArg OptionalValue used as this when executing callback.
None (undefined).