progress event is fired to indicate that an operation is in progress.
|| ||The event target (the topmost target in the DOM tree).|
|| ||The type of event.|
|| ||Whether the event normally bubbles or not|
|| ||Whether the event is cancellable or not?|
| ||boolean||Specifies whether or not the total size of the transfer is known. Read only.|
| ||unsigned long (long)||The 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.|
| ||unsigned long (long)||The 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.|
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