NavigatorID.appVersion

Deprecated

This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. 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.

Returns either "4.0" or a string representing version information about the browser.

Note

Do not rely on this property to return the correct browser version.

Syntax

window.navigator.appVersion

Value

Either "4.0" or a string representing version information about the browser.

Example

alert('Your browser version is reported as ' + navigator.appVersion);

Notes

The window.navigator.userAgent property may also contain the version number (for example "Mozilla/5.0 (Windows; U; Win98; en-US; rv:0.9.2) Gecko/20010725 Netscape 6/6.1"), but you should be aware of how easy it is to change the user agent string and "spoof" other browsers, platforms, or user agents, and also how cavalier the browser vendor themselves are with these properties.

The window.navigator.appVersion, window.navigator.appName and window.navigator.userAgent properties have been used in "browser sniffing" code: scripts that attempt to find out what kind of browser you are using and adjust pages accordingly. This lead to the current situation, where browsers had to return fake values from these properties in order not to be locked out of some websites.

Specifications

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

Browser compatibility

BCD tables only load in the browser