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The ProgressEvent.lengthComputable read-only property is a Boolean flag indicating if the resource concerned by the ProgressEvent has a length that can be calculated. If not, the ProgressEvent.total property has no significant value.


flag = ProgressEvent.lengthComputable


Specification Status Comment
The definition of 'ProgressEvent.lengthComputable' in that specification.
Living Standard  

Browser compatibility

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

Feature Chrome Edge Firefox (Gecko) Internet Explorer Opera Safari
Basic support 50 (Yes) 3.5 (1.9.1) (Yes) 37 3.1
Feature Android Webview Chrome for Android Edge Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support 50 50 (Yes) 1.0 (1.9.1) No support 37 2.0

See also

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 Last updated by: jpmedley,