constructor(DOMString type, optional ProgressEventInit eventInitDict = {});

readonly attribute boolean lengthComputable;

readonly attribute unsigned long long loaded;

readonly attribute unsigned long long total;

readonly attribute double loaded;

readonly attribute double total;

};

dictionary ProgressEventInit : EventInit {

boolean lengthComputable = false;

unsigned long long loaded = 0;

unsigned long long total = 0;

double loaded = 0;

double total = 0;

};

</pre>