Browser

Browser Attributes

The web browser attributes

Attribute	Type	Description	Examples	Stability
browser.brands	string[]	Array of brand name and version separated by a space [1]	[" Not A;Brand 99", "Chromium 99", "Chrome 99"]
browser.language	string	Preferred language of the user using the browser [2]	en; en-US; fr; fr-FR
browser.mobile	boolean	A boolean that is true if the browser is running on a mobile device [3]
browser.platform	string	The platform on which the browser is running [4]	Windows; macOS; Android

[1]: This value is intended to be taken from the UA client hints API (navigator.userAgentData.brands).

[2]: This value is intended to be taken from the Navigator API navigator.language.

[3]: This value is intended to be taken from the UA client hints API (navigator.userAgentData.mobile). If unavailable, this attribute SHOULD be left unset.

[4]: This value is intended to be taken from the UA client hints API (navigator.userAgentData.platform). If unavailable, the legacy navigator.platform API SHOULD NOT be used instead and this attribute SHOULD be left unset in order for the values to be consistent. The list of possible values is defined in the W3C User-Agent Client Hints specification. Note that some (but not all) of these values can overlap with values in the os.type and os.name attributes. However, for consistency, the values in the browser.platform attribute should capture the exact value that the user agent provides.