Time in milliseconds recorded by the API until present time for each type of connection. All samples older than maxStorageAge from now are deleted.
A data usage chunk is a
MozNetworkStatsData object representing the total number of bytes received and sent during a given amount of time (this amount of time is accessible through the
var max = navigator.mozNetworkStats.maxStorageAge;
A number given as a long type.
Not part of any specification.