Browser

Status:

type: browser

Description: The web browser in which the application represented by the resource is running. The browser.* attributes MUST be used only for resources that represent applications running in a web browser (regardless of whether running on a mobile or desktop device).

Attribute	Type	Description	Examples	Requirement Level	Stability
browser.brands	string[]	Array of brand name and version separated by a space [1]	[" Not A;Brand 99", "Chromium 99", "Chrome 99"]	Recommended
browser.language	string	Preferred language of the user using the browser [2]	en; en-US; fr; fr-FR	Recommended
browser.mobile	boolean	A boolean that is true if the browser is running on a mobile device [3]		Recommended
browser.platform	string	The platform on which the browser is running [4]	Windows; macOS; Android	Recommended
user_agent.original	string	Full user-agent string provided by the browser [5]	Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.54 Safari/537.36	Recommended

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

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

[3] browser.mobile: 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] browser.platform: 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.

[5] user_agent.original: The user-agent value SHOULD be provided only from browsers that do not have a mechanism to retrieve brands and platform individually from the User-Agent Client Hints API. To retrieve the value, the legacy navigator.userAgent API can be used.

All of these attributes can be provided by the user agent itself in the form of an HTTP header (e.g. Sec-CH-UA, Sec-CH-Platform, User-Agent). However, the headers could be removed by proxy servers, and are tied to calls from individual clients. In order to support batching through services like the Collector and to prevent loss of data (e.g. due to proxy servers removing headers), these attributes should be used when possible.