User Agent

Identifying your browser or the like.

This page uses some web APIs to identify your user agent and its runtime environment. Much like [Media Queries], they can be abused to construct a fingerprint. Therefore, some values may be fudged to minimize the side effect.

JavaScript is required for this page to work correctly.

Navigator

Various user agent properties.

The Navigator web API facilitates the retrieval of the user agent's identity and state. The following lists some available properties, and what your user agent returns for each. Your user agent may not support some of them, sometimes for privacy.

Standard

canShareWill invoking the native sharing mechanism succeed?
cookieEnabledWill setting a cookie not be ignored?
deviceMemoryApproximate Amount of Device Memory (in GB):
doNotTrackDo-not-track Preference:
hardwareConcurrencyNumber of Logical Processor Cores Available:
javaEnabledIs the user agent Java-enabled?
languagePreferred Language:
languagesKnown Languages (ordered by preference):
maxTouchPointsMaximum Number of Simultaneous Touch Contact Points:
mimeTypesEnumerable Supported MIME types:
onLineIs the user agent working online?
pdfViewerEnabledDoes the user agent supports inline display of PDF files?
pluginsEnumerable Installed Plugins:
userAgentUser Agent String:
vendorVendor:
webdriverIs the user agent controlled by automation?

Non-standard

buildIDBuild Identifier:
securitypolicyNetscape 4.7x-specific:
standaloneIs the user agent running in standalone mode?

Deprecated

appCodeNameInternal Code Name:
appNameOfficial Name:
appVersionVersion:
oscpuCurrent Operating System:
platformPlatform:
productAlways Gecko:
productSubBuild Number:
taintEnabledAlways false:
vendorSubVendor Version Number:

NavigatorUAData

This interface is part of an upcoming replacement to the user agent string: User-Agent Client Hints. Its purpose is to:

return parts of the user agent data in a selective manner,
get of rid crufts, which were left over the decades for backwards compatibility,
eliminate the need to parse such a string,

just to name a few. As of this page's date, this experimental feature is supported only in Chrome/-ium. Properties are grouped by their entropy, with those being low are unlikely to identify a user, and vice versa for those being high. The following is a printout of the low entropy properties.

History

of pages visited in the current tab or frame.

The History web API facilitates the retrieval of the user agent's session history. This does not allow the retrieval of specific entries (which otherwise would have caused massive privacy invasions). The following lists the meaningfully-enumerable properties, and what your user agent returns for each.

lengthEntries Count:
scrollRestorationScroll Restoration Behavior:

Referrer

URL of the page from which you got here.

The Document.referrer property defines the URL of the page from which you navigated to this page. It is usually blank if you got here by anything but a link. Conversely, a link with the rel="noreferrer" attribute can blank this property. Throughout the Online Portal, such links are preceded by an asterisk (*). User agents can also blank this property.

To see this in effect, navigate to Media Queries using the link just above the page footer, then navigate to this page using its link found at the same place.

referrerWhat got you here:

Credits

Much of the text in this page is derived from the corresponding [MDN web document].

Fun

Experimental play things.

Gives you this tingling feeling. Keep tapping for a continuous sensation…
Gets your current geolocation coordinates into a modal dialog.
Returns a prose summary of the battery.
Runs this absolutely-needless visual trick.
this page to your peers, so they too can have their own.

See also [Media Queries] for a CSS-powered equivalent.