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 property has no significant value.


flag = ProgressEvent.lengthComputable


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

Browser compatibility

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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

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Last updated by: connorshea,