The nsIDOMProgressEvent is used in the media elements (<video> and <audio>
 to inform of the progress of the media download. It is currently undefined
 in the HTML5 specification. This implementation is a placeholder until
 the specification is complete and is compatible with the WebKit ProgressEvent.
[scriptable, uuid(6af7022c-d7f8-414c-a11f-a7918f14052b)]
interface nsIDOMProgressEvent : nsIDOMEvent


readonly attribute boolean lengthComputable

readonly attribute unsigned long long loaded

readonly attribute unsigned long long total


void initProgressEvent(in DOMString typeArg, in boolean canBubbleArg, in boolean cancelableArg, in boolean lengthComputableArg, in unsigned long long loadedArg, in unsigned long long totalArg)