ProgressEvent.total read-only property is an unsigned
64-bit integer value indicating the total size of the data being processed or
transmitted. In the case of an HTTP transmission, this is the size of the body of the
Content-Length), and does not include headers and other
If the event's
false, this value is meaningless and should be ignored.
let value = progressEvent.total;
The definition of 'ProgressEvent.lengthComputable' in that specification.
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ProgressEventinterface it belongs to.