WorkerNavigator: appVersion property

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

Note: This feature is only available in Web Workers.

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.

Value

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

Examples

alert(`Your browser version is reported as ${navigator.appVersion}`);

The 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 navigator.appVersion, navigator.appName and 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.