This feature has been removed from the Web standards. Though some browsers may still support it, it is in the process of being dropped. Avoid using it and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.

The Navigator.vendorSub read-only property is the substring of the vendor having to do with the vendor version number.  The specification allows browsers to always return the empty string, so don't rely on this property to get a reliable answer.


venSub = window.navigator.vendorSub 



// returns "6.1" where the vendor part of userAgent is 
// Netscape6/6.1


vendorSub is a component of the full user agent string. It refers to the version number that the vendor themselves have given the current browser (as opposed to the version of the product, which may be different). In Netscape 6.1, the productSub is given as "5.0" and the vendorSub is "6.1." See also navigator.productSub, navigator.userAgent, navigator.vendor


Specification Status Comment
HTML Living Standard
The definition of 'NavigatorID.platform' in that specification.
Living Standard Initial definition

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 Firefox (Gecko) Internet Explorer Opera Safari
Basic support (Yes) (Yes) 12 15 (Yes)
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support (Yes) (Yes) (Yes) 12 15 (Yes)

Document Tags and Contributors

Last updated by: Sebastianz,