progress event is fired when the user agent is downloading resources listed by the manifest.
| ||EventTarget (DOM element)||The event target (the topmost target in the DOM tree). Read Only.|
| ||string||The type of event. Read only.|
| ||boolean||Does the event normally bubble? Read only.|
| ||boolean||Is it possible to cancel the event? Read only.|
| ||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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