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not trustworthy
'''User Agent''' string is a string which is visible in the HTTP headers of an HTTP client and in the navigator.userAgent object JavaScript for JS enabled client.
Never trust the user string to be accurate - many tablets and phones especially may mislead. To confirm the ability of the browser/platform use a specific test where available.
== HTTP ==
For example on Firefox OS devices.
User-Agent: Mozilla/5.0 (Mobile; rv:18.0) Gecko/18.0 Firefox/18.0
== Browsers with JavaScript ==
var ua = navigator.userAgent;
== Around this topic ==
* [[UA/override|User Agent Override]]
* [[Compatibility/UADetectionLibraries|User Agent Detection Libraries]]
