The nsIDOMProgressEvent is used in the media elements (<video> and <audio> ) to inform interested code of the progress of the media download. This implementation is a placeholder until the specification is complete, and is compatible with the WebKit ProgressEvent.
Documentation for this class was provided by MDN. var lengthComputable(default,null) : BoolSpecifies whether or not the total size of the transfer is known. Read only. var loaded(default,null) : IntThe number of bytes transferred since the beginning of the operation. This doesn't include headers and other overhead, but only the content itself. Read only. var total(default,null) : IntThe total number of bytes of content that will be transferred during the operation. If the total size is unknown, this value is zero. Read only. function new( type : String, ?canBubble : Bool, ?cancelable : Bool ) : Void