The read-only property is an unsigned long long representing the total amount of work that the underlying process is in the progress of performing. When downloading a resource using HTTP, this only represent the content itself, not headers and other overhead.


value =


Specification Status Comment
Progress Events
The definition of 'ProgressEvent.lengthComputable' in that specification.
Candidate Recommendation Initial definition.

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support Not supported 3.5 (1.9.1) Not supported Not supported Not supported
Feature Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support Not supported 1.0 (1.9.1) Not supported Not supported Not supported

See also

Document Tags and Contributors

 Contributors to this page: fscholz, kscarfone, teoli
 Last updated by: fscholz,