WorkerNavigator

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.

* Some parts of this feature may have varying levels of support.

See full compatibility

Note: This feature is only available in Web Workers.

The WorkerNavigator interface represents a subset of the Navigator interface allowed to be accessed from a Worker. Such an object is initialized for each worker and is available via the self.navigator property.

Instance properties

The WorkerNavigator interface doesn't inherit any property.

WorkerNavigator.appCodeName Read only: Always returns 'Mozilla', in any browser. This property is kept only for compatibility purposes.
WorkerNavigator.appName Read only: Returns the official name of the browser. Do not rely on this property to return the correct value.
WorkerNavigator.appVersion Read only: Returns the version of the browser as a string. Do not rely on this property to return the correct value.
WorkerNavigator.connection Read only: Provides a NetworkInformation object containing information about the network connection of a device.
WorkerNavigator.deviceMemory Read only Secure context: Returns the amount of device memory in gigabytes. This value is an approximation given by rounding to the nearest power of 2 and dividing that number by 1024.
WorkerNavigator.globalPrivacyControl Read only: Returns a boolean indicating a user's consent to their information being shared or sold.
WorkerNavigator.gpu Read only Secure context: Returns the GPU object for the current worker context. The entry point for the WebGPU API.
WorkerNavigator.hardwareConcurrency Read only: Returns the number of logical processor cores available.
WorkerNavigator.hid Read only Secure context: Returns an HID object providing methods for connecting to HID devices already granted permission by the user and listing attached HID devices, and event handlers for responding to HID devices connecting and disconnecting.
WorkerNavigator.language Read only: Returns a string representing the preferred language of the user, usually the language of the browser UI. The null value is returned when this is unknown.
WorkerNavigator.languages Read only: Returns an array of strings representing the languages known to the user, by order of preference.
WorkerNavigator.locks Read only Secure context: Returns a LockManager object which provides methods for requesting a new Lock object and querying for an existing Lock object.
WorkerNavigator.mediaCapabilities Read only: Returns a MediaCapabilities object that can expose information about the decoding and encoding capabilities for a given format and output capabilities.
WorkerNavigator.onLine Read only: Returns a boolean value indicating whether the browser is online.
WorkerNavigator.permissions Read only: Returns a Permissions object that can be used to query and update permission status of APIs covered by the Permissions API.
WorkerNavigator.platform Read only: Returns a string representing the platform of the browser. Do not rely on this property to return the correct value.
WorkerNavigator.product Read only: Always returns 'Gecko', on any browser. This property is kept only for compatibility purposes.
WorkerNavigator.serial Read only Secure context: Returns a Serial object, which represents the entry point into the Web Serial API, to enable the control of serial ports.
WorkerNavigator.serviceWorker Read only Secure context: Returns a ServiceWorkerContainer object, which provides access to registration, removal, upgrade, and communication with the ServiceWorker objects for the associated document.
WorkerNavigator.storage Read only Secure context: Returns a StorageManager interface for managing persistence permissions and estimating available storage.
WorkerNavigator.usb Read only Secure context: Returns a USB object for the current document, providing access to WebUSB API functionality.
WorkerNavigator.userAgent Read only: Returns the user agent string for the current browser.
WorkerNavigator.userAgentData Read only Secure context: Returns a NavigatorUAData object, which gives access to information about the browser and operating system of the user.

Instance methods

The WorkerNavigator interface doesn't inherit any method.

WorkerNavigator.clearAppBadge() Secure context: Clears a badge on the current app's icon and returns a Promise that resolves with undefined.
WorkerNavigator.setAppBadge() Secure context: Sets a badge on the icon associated with this app and returns a Promise that resolves with undefined.

Specifications

Specification
HTML # the-workernavigator-object

Browser compatibility

	desktop					mobile							server
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on iOS	Samsung Internet	WebView Android	WebView on iOS	Deno
`WorkerNavigator`	Chrome – Full support Chrome 4 (Release date: 2010-01-25) footnote Full support	Edge – Full support Edge 12 (Release date: 2015-07-29) footnote Full support	Firefox – Full support Firefox 3.5 (Release date: 2009-06-30) footnote Full support	Opera – Full support Opera 12.1 (Release date: 2012-11-20) footnote Full support	Safari – Full support Safari 4 (Release date: 2009-06-08) footnote Full support	Chrome Android – Full support Chrome Android 18 (Release date: 2012-06-27) footnote Full support	Firefox for Android – Full support Firefox for Android 4 (Release date: 2011-03-29) footnote Full support	Opera Android – Full support Opera Android 12.1 (Release date: 2012-10-09) footnote Full support	Safari on iOS – Full support Safari on iOS 5 (Release date: 2011-10-12) footnote Full support	Samsung Internet – Full support Samsung Internet 1 (Release date: 2013-04-27) footnote Full support	WebView Android – Full support WebView Android 4.4 (Release date: 2013-12-09) footnote Full support	WebView on iOS – Full support WebView on iOS 5 (Release date: 2011-10-12) footnote Full support	Deno – Full support Deno 1.8 (Release date: 2021-03-02) footnote Full support
`appCodeName`	Chrome – Full support Chrome 4 (Release date: 2010-01-25) footnote Full support	Edge – Full support Edge 12 (Release date: 2015-07-29) footnote Full support	Firefox – Full support Firefox 3.5 (Release date: 2009-06-30) footnote Full support	Opera – Full support Opera 15 (Release date: 2013-07-02) footnote Full support	Safari – Full support Safari 10 (Release date: 2016-09-20) footnote Full support	Chrome Android – Full support Chrome Android 18 (Release date: 2012-06-27) footnote Full support	Firefox for Android – Full support Firefox for Android 4 (Release date: 2011-03-29) footnote Full support	Opera Android – Full support Opera Android 14 (Release date: 2013-05-21) footnote Full support	Safari on iOS – Full support Safari on iOS 10 (Release date: 2016-09-13) footnote Full support	Samsung Internet – Full support Samsung Internet 1 (Release date: 2013-04-27) footnote Full support	WebView Android – Full support WebView Android 4.4 (Release date: 2013-12-09) footnote Full support	WebView on iOS – Full support WebView on iOS 10 (Release date: 2016-09-13) footnote Full support	Deno – No support Deno footnote No support
`appName`	Chrome – Full support Chrome 4 (Release date: 2010-01-25) footnote Full support	Edge – Full support Edge 12 (Release date: 2015-07-29) footnote Full support	Firefox – Full support Firefox 3.5 (Release date: 2009-06-30) footnote Full support	Opera – Full support Opera 12.1 (Release date: 2012-11-20) footnote Full support	Safari – Full support Safari 4 (Release date: 2009-06-08) footnote Full support	Chrome Android – Full support Chrome Android 18 (Release date: 2012-06-27) footnote Full support	Firefox for Android – Full support Firefox for Android 4 (Release date: 2011-03-29) footnote Full support	Opera Android – Full support Opera Android 12.1 (Release date: 2012-10-09) footnote Full support	Safari on iOS – Full support Safari on iOS 5 (Release date: 2011-10-12) footnote Full support	Samsung Internet – Full support Samsung Internet 1 (Release date: 2013-04-27) footnote Full support	WebView Android – Full support WebView Android 4.4 (Release date: 2013-12-09) footnote Full support	WebView on iOS – Full support WebView on iOS 5 (Release date: 2011-10-12) footnote Full support	Deno – No support Deno footnote No support
`appVersion`	Chrome – Full support Chrome 4 (Release date: 2010-01-25) footnote Full support	Edge – Full support Edge 12 (Release date: 2015-07-29) footnote Full support	Firefox – Full support Firefox 3.5 (Release date: 2009-06-30) footnote Full support	Opera – Full support Opera 12.1 (Release date: 2012-11-20) footnote Full support	Safari – Full support Safari 4 (Release date: 2009-06-08) footnote Full support	Chrome Android – Full support Chrome Android 18 (Release date: 2012-06-27) footnote Full support	Firefox for Android – Full support Firefox for Android 4 (Release date: 2011-03-29) footnote Full support	Opera Android – Full support Opera Android 12.1 (Release date: 2012-10-09) footnote Full support	Safari on iOS – Full support Safari on iOS 5 (Release date: 2011-10-12) footnote Full support	Samsung Internet – Full support Samsung Internet 1 (Release date: 2013-04-27) footnote Full support	WebView Android – Full support WebView Android 4.4 (Release date: 2013-12-09) footnote Full support	WebView on iOS – Full support WebView on iOS 5 (Release date: 2011-10-12) footnote Full support	Deno – No support Deno footnote No support
`connection`	Chrome – Full support Chrome 61 (Release date: 2017-09-05) footnote Full support	Edge – Full support Edge 79 (Release date: 2020-01-15) footnote Full support	Firefox – No support Firefox footnote No support	Opera – Full support Opera 48 (Release date: 2017-09-27) footnote Full support	Safari – No support Safari footnote footnote See bug 185697	Chrome Android – Full support Chrome Android 38 (Release date: 2014-10-08) footnote Full support	Firefox for Android – No support Firefox for Android 53 – 98 (Release date: 2017-04-19) footnote Removed in 99 and later	Opera Android – Full support Opera Android 37 (Release date: 2016-06-16) footnote Full support	Safari on iOS – No support Safari on iOS footnote footnote See bug 185697	Samsung Internet – Full support Samsung Internet 3 (Release date: 2015-04-10) footnote Full support	WebView Android – Full support WebView Android 50 (Release date: 2016-04-13) footnote Full support	WebView on iOS – No support WebView on iOS footnote footnote See bug 185697	Deno – No support Deno footnote No support
`deviceMemory`	Chrome – Full support Chrome 65 (Release date: 2018-03-06) footnote footnote From Chrome 147, reported values are 2, 4, 8, 16, and 32. footnote Before Chrome 147, reported values are 0.25, 0.5, 1, 2, 4, and 8.	Edge – Full support Edge 79 (Release date: 2020-01-15) footnote footnote From Edge 147, reported values are 2, 4, 8, 16, and 32. footnote Before Edge 147, reported values are 0.25, 0.5, 1, 2, 4, and 8.	Firefox – No support Firefox footnote No support	Opera – Full support Opera 52 (Release date: 2018-03-22) footnote footnote From Opera 131, reported values are 2, 4, 8, 16, and 32. footnote Before Opera 131, reported values are 0.25, 0.5, 1, 2, 4, and 8.	Safari – No support Safari footnote No support	Chrome Android – Full support Chrome Android 65 (Release date: 2018-03-06) footnote footnote From Chrome 147, reported values are 1, 2, 4, and 8. footnote Before Chrome 147, reported values were 0.25, 0.5, 1, 2, 4, and 8.	Firefox for Android – No support Firefox for Android footnote No support	Opera Android – Full support Opera Android 47 (Release date: 2018-07-23) footnote footnote From Chrome 147, reported values are 1, 2, 4, and 8. footnote Before Chrome 147, reported values were 0.25, 0.5, 1, 2, 4, and 8.	Safari on iOS – No support Safari on iOS footnote No support	Samsung Internet – Full support Samsung Internet 9 (Release date: 2018-09-15) footnote footnote From Chrome 147, reported values are 1, 2, 4, and 8. footnote Before Chrome 147, reported values were 0.25, 0.5, 1, 2, 4, and 8.	WebView Android – Full support WebView Android 65 (Release date: 2018-03-06) footnote footnote From Chrome 147, reported values are 1, 2, 4, and 8. footnote Before Chrome 147, reported values were 0.25, 0.5, 1, 2, 4, and 8.	WebView on iOS – No support WebView on iOS footnote No support	Deno – No support Deno footnote No support
`globalPrivacyControl` Experimental	Chrome – No support Chrome footnote No support	Edge – No support Edge footnote No support	Firefox – Full support Firefox 120 (Release date: 2023-11-21) footnote footnote Opt-in to GPC by setting the preference `privacy.globalprivacycontrol.enabled` to `true`.	Opera – No support Opera footnote No support	Safari – No support Safari footnote No support	Chrome Android – No support Chrome Android footnote No support	Firefox for Android – Full support Firefox for Android 122 (Release date: 2024-01-23) footnote footnote Opt-in to GPC using the Enhanced Tracking Protection toggle 'Tell web sites not to share & sell data', or by setting the preference `privacy.globalprivacycontrol.enabled` to `true`.	Opera Android – No support Opera Android footnote No support	Safari on iOS – No support Safari on iOS footnote No support	Samsung Internet – No support Samsung Internet footnote No support	WebView Android – No support WebView Android footnote No support	WebView on iOS – No support WebView on iOS footnote No support	Deno – No support Deno footnote No support
`gpu`	Chrome – Partial support Chrome 113 (Release date: 2023-05-02) footnote Partial support footnote Supported on ChromeOS, macOS, and Windows. footnote Supported on Linux (Intel Gen12+ GPUs only) since Chrome 144.	Edge – Partial support Edge 113 (Release date: 2023-05-05) footnote Partial support footnote Supported on ChromeOS, macOS, and Windows. footnote Supported on Linux (Intel Gen12+ GPUs only) since Edge 144.	Firefox – Partial support Firefox 141 (Release date: 2025-07-22) footnote Partial support footnote Supports all contexts except service workers. See bug 1942431. footnote Supports Windows since Firefox 141. See bug 1972486. footnote Supports macOS Tahoe on Apple silicon since Firefox 145. See bug 1992212. footnote Supports older macOS versions on Apple silicon since Firefox 147. See bug 1993341. footnote Does not support macOS on Intel CPUs. See bug 2004105. footnote Does not support Linux. See bug 2006676.	Opera – Partial support Opera 99 (Release date: 2023-05-16) footnote Partial support footnote Supported on ChromeOS, macOS, and Windows. footnote Supported on Linux (Intel Gen12+ GPUs only) since Opera 128.	Safari – Full support Safari 26 (Release date: 2025-09-15) footnote Full support	Chrome Android – Full support Chrome Android 121 (Release date: 2024-01-23) footnote Full support	Firefox for Android – Partial support Firefox for Android 141 (Release date: 2025-07-22) footnote Partial support footnote Supports all contexts except service workers. See bug 1942431. footnote Supports Windows since Firefox for Android 141. See bug 1972486. footnote Supports macOS Tahoe on Apple silicon since Firefox for Android 145. See bug 1992212. footnote Supports older macOS versions on Apple silicon since Firefox for Android 147. See bug 1993341. footnote Does not support macOS on Intel CPUs. See bug 2004105. footnote Does not support Linux. See bug 2006676.	Opera Android – Full support Opera Android 81 (Release date: 2024-03-14) footnote Full support	Safari on iOS – Full support Safari on iOS 26 (Release date: 2025-09-15) footnote Full support	Samsung Internet – Full support Samsung Internet 25 (Release date: 2024-04-24) footnote Full support	WebView Android – Full support WebView Android 121 (Release date: 2024-01-23) footnote Full support	WebView on iOS – Full support WebView on iOS 26 (Release date: 2025-09-15) footnote Full support	Deno – No support Deno 1.8 – 1.31 (Release date: 2021-03-02) footnote Removed in 1.32 and later Deno – No support Deno 1.39 (Release date: 2023-12-14) disabled disabled From version 1.39 users must explicitly set the `--unstable-webgpu` runtime flag.
`hardwareConcurrency`	Chrome – Full support Chrome 37 (Release date: 2014-08-26) footnote Full support	Edge – Full support Edge 15 (Release date: 2017-04-05) footnote Full support	Firefox – Full support Firefox 48 (Release date: 2016-08-02) footnote Full support	Opera – Full support Opera 24 (Release date: 2014-09-02) footnote Full support	Safari – No support Safari 10.1 – 10.1 (Release date: 2017-03-27) footnote Removed in 11 and later Safari – Full support Safari 15.4 (Release date: 2022-03-14) footnote footnote The value of this property is clamped to 4 or 8 cores, to prevent device fingerprinting. See bug 233381.	Chrome Android – Full support Chrome Android 37 (Release date: 2014-09-03) footnote Full support	Firefox for Android – Full support Firefox for Android 48 (Release date: 2016-08-02) footnote Full support	Opera Android – Full support Opera Android 24 (Release date: 2014-09-10) footnote Full support	Safari on iOS – No support Safari on iOS 10.3 – 10.3 (Release date: 2017-03-27) footnote Removed in 11 and later Safari on iOS – Full support Safari on iOS 15.4 (Release date: 2022-03-14) footnote footnote The value of this property is clamped to 4 or 8 cores, to prevent device fingerprinting. See bug 233381.	Samsung Internet – Full support Samsung Internet 3 (Release date: 2015-04-10) footnote Full support	WebView Android – Full support WebView Android 37 (Release date: 2014-09-03) footnote Full support	WebView on iOS – No support WebView on iOS 10.3 – 10.3 (Release date: 2017-03-27) footnote Removed in 11 and later WebView on iOS – Full support WebView on iOS 15.4 (Release date: 2022-03-14) footnote footnote The value of this property is clamped to 4 or 8 cores, to prevent device fingerprinting. See bug 233381.	Deno – Full support Deno 1.13 (Release date: 2021-08-10) footnote Full support
`hid` Experimental	Chrome – Full support Chrome 131 (Release date: 2024-11-12) footnote Full support	Edge – Full support Edge 131 (Release date: 2024-11-14) footnote Full support	Firefox – No support Firefox footnote No support	Opera – Full support Opera 116 (Release date: 2025-01-08) footnote Full support	Safari – No support Safari footnote No support	Chrome Android – No support Chrome Android footnote footnote See bug 40628009	Firefox for Android – No support Firefox for Android footnote No support	Opera Android – No support Opera Android footnote footnote See bug 40628009	Safari on iOS – No support Safari on iOS footnote No support	Samsung Internet – No support Samsung Internet footnote footnote See bug 40628009	WebView Android – No support WebView Android footnote footnote See bug 40163407	WebView on iOS – No support WebView on iOS footnote No support	Deno – No support Deno footnote No support
`language`	Chrome – Full support Chrome 4 (Release date: 2010-01-25) footnote Full support	Edge – Full support Edge 12 (Release date: 2015-07-29) footnote Full support	Firefox – Full support Firefox 3.5 (Release date: 2009-06-30) footnote footnote Before Firefox 4, this property's value was also part of the user agent string, as reported by `navigator.userAgent`. Starting in Firefox 5, this property's value is based on the value of the `Accept-Language` HTTP header.	Opera – Full support Opera 4 (Release date: 2000-06-28) footnote Full support	Safari – Full support Safari 10 (Release date: 2016-09-20) footnote Full support	Chrome Android – Full support Chrome Android 18 (Release date: 2012-06-27) footnote Full support	Firefox for Android – Full support Firefox for Android 4 (Release date: 2011-03-29) footnote Full support	Opera Android – Full support Opera Android 10.1 (Release date: 2010-11-09) footnote Full support	Safari on iOS – Full support Safari on iOS 10 (Release date: 2016-09-13) footnote Full support	Samsung Internet – Full support Samsung Internet 1 (Release date: 2013-04-27) footnote Full support	WebView Android – Full support WebView Android 4.4 (Release date: 2013-12-09) footnote Full support	WebView on iOS – Full support WebView on iOS 10 (Release date: 2016-09-13) footnote Full support	Deno – No support Deno footnote No support
`languages`	Chrome – Full support Chrome 37 (Release date: 2014-08-26) footnote footnote Before Chrome 65, `navigator.languages[0]` is not guaranteed to equal `navigator.language`.	Edge – Full support Edge 16 (Release date: 2017-10-17) footnote Full support	Firefox – Full support Firefox 32 (Release date: 2014-09-02) footnote footnote In Firefox, the `navigator.languages` property's value is taken from the `intl.accept_languages` preference.	Opera – Full support Opera 24 (Release date: 2014-09-02) footnote Full support	Safari – Full support Safari 10.1 (Release date: 2017-03-27) footnote Full support	Chrome Android – Full support Chrome Android 37 (Release date: 2014-09-03) footnote footnote Before Chrome Android 65, `navigator.languages[0]` is not guaranteed to equal `navigator.language`.	Firefox for Android – Full support Firefox for Android 32 (Release date: 2014-09-02) footnote footnote In Firefox for Android, the `navigator.languages` property's value is taken from the `intl.accept_languages` preference.	Opera Android – Full support Opera Android 24 (Release date: 2014-09-10) footnote Full support	Safari on iOS – Full support Safari on iOS 10.3 (Release date: 2017-03-27) footnote Full support	Samsung Internet – Full support Samsung Internet 3 (Release date: 2015-04-10) footnote Full support	WebView Android – Full support WebView Android 37 (Release date: 2014-09-03) footnote footnote Before version 65, `navigator.languages[0]` is not guaranteed to equal `navigator.language`.	WebView on iOS – Full support WebView on iOS 10.3 (Release date: 2017-03-27) footnote Full support	Deno – No support Deno footnote No support
`locks`	Chrome – Full support Chrome 69 (Release date: 2018-09-04) footnote Full support	Edge – Full support Edge 79 (Release date: 2020-01-15) footnote Full support	Firefox – Full support Firefox 96 (Release date: 2022-01-11) footnote Full support	Opera – Full support Opera 56 (Release date: 2018-09-25) footnote Full support	Safari – Full support Safari 15.4 (Release date: 2022-03-14) footnote Full support	Chrome Android – Full support Chrome Android 69 (Release date: 2018-09-04) footnote Full support	Firefox for Android – Full support Firefox for Android 96 (Release date: 2022-01-11) footnote Full support	Opera Android – Full support Opera Android 48 (Release date: 2018-11-08) footnote Full support	Safari on iOS – Full support Safari on iOS 15.4 (Release date: 2022-03-14) footnote Full support	Samsung Internet – Full support Samsung Internet 10 (Release date: 2019-08-22) footnote Full support	WebView Android – Full support WebView Android 69 (Release date: 2018-09-04) footnote Full support	WebView on iOS – Full support WebView on iOS 15.4 (Release date: 2022-03-14) footnote Full support	Deno – No support Deno footnote No support
`mediaCapabilities`	Chrome – Full support Chrome 76 (Release date: 2019-07-30) footnote Full support	Edge – Full support Edge 79 (Release date: 2020-01-15) footnote Full support	Firefox – Full support Firefox 63 (Release date: 2018-10-23) footnote Full support	Opera – Full support Opera 63 (Release date: 2019-08-20) footnote Full support	Safari – Full support Safari 15.4 (Release date: 2022-03-14) footnote Full support	Chrome Android – Full support Chrome Android 76 (Release date: 2019-07-30) footnote Full support	Firefox for Android – Full support Firefox for Android 63 (Release date: 2018-10-23) footnote Full support	Opera Android – Full support Opera Android 54 (Release date: 2019-10-18) footnote Full support	Safari on iOS – Full support Safari on iOS 15.4 (Release date: 2022-03-14) footnote Full support	Samsung Internet – Full support Samsung Internet 12 (Release date: 2020-06-19) footnote Full support	WebView Android – Full support WebView Android 76 (Release date: 2019-07-30) footnote Full support	WebView on iOS – Full support WebView on iOS 15.4 (Release date: 2022-03-14) footnote Full support	Deno – No support Deno footnote No support
`ml` Experimental	Chrome – No support Chrome 112 (Release date: 2023-04-04) disabled disabled From version 112 users must explicitly set the `#web-machine-learning-neural-network` preference to `Enabled`. To change preferences in Chrome, visit chrome://flags.	Edge – No support Edge 112 (Release date: 2023-04-06) disabled disabled From version 112 users must explicitly set the `#web-machine-learning-neural-network` preference to `Enabled`. To change preferences in Edge, visit about:flags.	Firefox – No support Firefox footnote No support	Opera – No support Opera 98 (Release date: 2023-04-20) disabled disabled From version 98 users must explicitly set the `#web-machine-learning-neural-network` preference to `Enabled`. To change preferences in Opera, visit opera://flags.	Safari – No support Safari footnote No support	Chrome Android – No support Chrome Android 112 (Release date: 2023-04-04) disabled disabled From version 112 users must explicitly set the `#web-machine-learning-neural-network` preference to `Enabled`. To change preferences in Chrome Android, visit chrome://flags.	Firefox for Android – No support Firefox for Android footnote No support	Opera Android – No support Opera Android footnote No support	Safari on iOS – No support Safari on iOS footnote No support	Samsung Internet – No support Samsung Internet footnote No support	WebView Android – No support WebView Android footnote No support	WebView on iOS – No support WebView on iOS footnote No support	Deno – No support Deno footnote No support
`onLine`	Chrome – Full support Chrome 4 (Release date: 2010-01-25) footnote Full support	Edge – Full support Edge 12 (Release date: 2015-07-29) footnote Full support	Firefox – Full support Firefox 3.5 (Release date: 2009-06-30) footnote footnote Since Firefox 4 the browser returns `true` when 'Work Offline' mode is disabled and `false` when it is enabled, regardless of actual connectivity. Since Firefox 41, on OS X and Windows, the returned values follow the actual network connectivity, unless 'Work offline' mode is selected (where it will always return `false`).	Opera – Full support Opera 10.6 (Release date: 2010-07-01) footnote footnote From Opera 11.1 until Opera 12.1, the browser returns `true` when 'Work Offline' mode is disabled and `false` when it is enabled, regardless of actual connectivity.	Safari – Full support Safari 4 (Release date: 2009-06-08) footnote Full support	Chrome Android – Full support Chrome Android 18 (Release date: 2012-06-27) footnote Full support	Firefox for Android – Full support Firefox for Android 4 (Release date: 2011-03-29) footnote Full support	Opera Android – Full support Opera Android 11 (Release date: 2011-03-22) footnote footnote From Opera 11.1 until Opera 12.1, the browser returns `true` when 'Work Offline' mode is disabled and `false` when it is enabled, regardless of actual connectivity.	Safari on iOS – Full support Safari on iOS 5 (Release date: 2011-10-12) footnote Full support	Samsung Internet – Full support Samsung Internet 1 (Release date: 2013-04-27) footnote Full support	WebView Android – Partial support WebView Android 4.4 (Release date: 2013-12-09) footnote Partial support footnote Can incorrectly return true, see bug 41369933.	WebView on iOS – Full support WebView on iOS 5 (Release date: 2011-10-12) footnote Full support	Deno – No support Deno footnote No support
`permissions`	Chrome – Full support Chrome 43 (Release date: 2015-05-19) footnote Full support	Edge – Full support Edge 79 (Release date: 2020-01-15) footnote Full support	Firefox – Full support Firefox 133 (Release date: 2024-11-26) footnote Full support	Opera – Full support Opera 30 (Release date: 2015-06-09) footnote Full support	Safari – Full support Safari 16.4 (Release date: 2023-03-27) footnote Full support	Chrome Android – Full support Chrome Android 43 (Release date: 2015-05-27) footnote Full support	Firefox for Android – Full support Firefox for Android 133 (Release date: 2024-11-26) footnote Full support	Opera Android – Full support Opera Android 30 (Release date: 2015-06-10) footnote Full support	Safari on iOS – Full support Safari on iOS 16.4 (Release date: 2023-03-27) footnote Full support	Samsung Internet – Full support Samsung Internet 4 (Release date: 2016-03-11) footnote Full support	WebView Android – No support WebView Android footnote footnote See bug 40418964	WebView on iOS – Full support WebView on iOS 16.4 (Release date: 2023-03-27) footnote Full support	Deno – No support Deno footnote No support
`platform`	Chrome – Full support Chrome 4 (Release date: 2010-01-25) footnote Full support	Edge – Full support Edge 12 (Release date: 2015-07-29) footnote Full support	Firefox – Full support Firefox 3.5 (Release date: 2009-06-30) footnote footnote Before Firefox 69, `platform` would report running on a 32-bit CPU if running the 32-bit version of Firefox on a 64-bit system. footnote You can override the value returned by `platform` by setting the preference `general.platform.override` to the string you wish to be returned instead.	Opera – Full support Opera 12.1 (Release date: 2012-11-20) footnote Full support	Safari – Full support Safari 4 (Release date: 2009-06-08) footnote Full support	Chrome Android – Full support Chrome Android 18 (Release date: 2012-06-27) footnote Full support	Firefox for Android – Full support Firefox for Android 4 (Release date: 2011-03-29) footnote Full support	Opera Android – Full support Opera Android 12.1 (Release date: 2012-10-09) footnote Full support	Safari on iOS – Full support Safari on iOS 5 (Release date: 2011-10-12) footnote Full support	Samsung Internet – Full support Samsung Internet 1 (Release date: 2013-04-27) footnote Full support	WebView Android – Full support WebView Android 4.4 (Release date: 2013-12-09) footnote Full support	WebView on iOS – Full support WebView on iOS 5 (Release date: 2011-10-12) footnote Full support	Deno – Full support Deno 2.7 (Release date: 2026-02-25) footnote Full support
`product`	Chrome – Full support Chrome 4 (Release date: 2010-01-25) footnote Full support	Edge – Full support Edge 12 (Release date: 2015-07-29) footnote Full support	Firefox – Full support Firefox 3.5 (Release date: 2009-06-30) footnote Full support	Opera – Full support Opera 15 (Release date: 2013-07-02) footnote Full support	Safari – Full support Safari 10 (Release date: 2016-09-20) footnote Full support	Chrome Android – Full support Chrome Android 18 (Release date: 2012-06-27) footnote Full support	Firefox for Android – Full support Firefox for Android 4 (Release date: 2011-03-29) footnote Full support	Opera Android – Full support Opera Android 14 (Release date: 2013-05-21) footnote Full support	Safari on iOS – Full support Safari on iOS 10 (Release date: 2016-09-13) footnote Full support	Samsung Internet – Full support Samsung Internet 1 (Release date: 2013-04-27) footnote Full support	WebView Android – Full support WebView Android 4.4 (Release date: 2013-12-09) footnote Full support	WebView on iOS – Full support WebView on iOS 10 (Release date: 2016-09-13) footnote Full support	Deno – No support Deno footnote No support
`serial`	Chrome – Full support Chrome 89 (Release date: 2021-03-02) footnote Full support	Edge – Full support Edge 89 (Release date: 2021-03-04) footnote Full support	Firefox – Preview support Firefox 151 (Release date: 2026-05-19) footnote Preview browser support	Opera – Full support Opera 75 (Release date: 2021-03-24) footnote Full support	Safari – No support Safari footnote No support	Chrome Android – Partial support Chrome Android 138 (Release date: 2025-06-24) footnote Partial support footnote Serial ports are only available if they're provided by Bluetooth RFCOMM serial port emulation.	Firefox for Android – No support Firefox for Android footnote No support	Opera Android – Partial support Opera Android 91 (Release date: 2025-08-19) footnote Partial support footnote Serial ports are only available if they're provided by Bluetooth RFCOMM serial port emulation.	Safari on iOS – No support Safari on iOS footnote No support	Samsung Internet – No support Samsung Internet footnote No support	WebView Android – No support WebView Android footnote footnote See bug 40740509	WebView on iOS – No support WebView on iOS footnote No support	Deno – No support Deno footnote No support
`serviceWorker`	Chrome – No support Chrome footnote footnote See bug 40364838	Edge – No support Edge footnote footnote See bug 40364838	Firefox – Full support Firefox 133 (Release date: 2024-11-26) footnote Full support	Opera – No support Opera footnote footnote See bug 40364838	Safari – Full support Safari 11.1 (Release date: 2018-04-12) footnote Full support	Chrome Android – No support Chrome Android footnote footnote See bug 40364838	Firefox for Android – Full support Firefox for Android 133 (Release date: 2024-11-26) footnote Full support	Opera Android – No support Opera Android footnote footnote See bug 40364838	Safari on iOS – Full support Safari on iOS 11.3 (Release date: 2018-03-29) footnote Full support	Samsung Internet – No support Samsung Internet footnote footnote See bug 40364838	WebView Android – No support WebView Android footnote footnote See bug 40364838	WebView on iOS – No support WebView on iOS footnote No support	Deno – No support Deno footnote No support
`storage`	Chrome – Full support Chrome 55 (Release date: 2016-12-01) footnote Full support	Edge – Full support Edge 79 (Release date: 2020-01-15) footnote Full support	Firefox – Full support Firefox 57 (Release date: 2017-11-14) footnote Full support	Opera – Full support Opera 42 (Release date: 2016-12-13) footnote Full support	Safari – Full support Safari 15.2 (Release date: 2021-12-13) footnote Full support	Chrome Android – Full support Chrome Android 55 (Release date: 2016-12-06) footnote Full support	Firefox for Android – Full support Firefox for Android 57 (Release date: 2017-11-28) footnote Full support	Opera Android – Full support Opera Android 42 (Release date: 2017-01-21) footnote Full support	Safari on iOS – Full support Safari on iOS 15.2 (Release date: 2021-12-13) footnote Full support	Samsung Internet – Full support Samsung Internet 6 (Release date: 2017-08-23) footnote Full support	WebView Android – Full support WebView Android 55 (Release date: 2016-12-06) footnote Full support	WebView on iOS – Full support WebView on iOS 15.2 (Release date: 2021-12-13) footnote Full support	Deno – No support Deno footnote No support
`storageBuckets` Experimental	Chrome – Full support Chrome 122 (Release date: 2024-02-20) footnote Full support	Edge – Full support Edge 122 (Release date: 2024-02-23) footnote Full support	Firefox – No support Firefox footnote footnote See bug 1594740	Opera – Full support Opera 108 (Release date: 2024-03-05) footnote Full support	Safari – No support Safari footnote No support	Chrome Android – Full support Chrome Android 122 (Release date: 2024-02-20) footnote Full support	Firefox for Android – No support Firefox for Android footnote footnote See bug 1594740	Opera Android – Full support Opera Android 81 (Release date: 2024-03-14) footnote Full support	Safari on iOS – No support Safari on iOS footnote No support	Samsung Internet – Full support Samsung Internet 26 (Release date: 2024-06-07) footnote Full support	WebView Android – Full support WebView Android 122 (Release date: 2024-02-20) footnote Full support	WebView on iOS – No support WebView on iOS footnote No support	Deno – No support Deno footnote No support
`usb`	Chrome – Partial support Chrome 70 – 117 (Release date: 2018-10-16) footnote Partial support footnote Available in dedicated workers, not available in shared workers and service workers. Chrome – Partial support Chrome 118 (Release date: 2023-10-10) footnote Partial support footnote Available in dedicated workers and WebExtension service workers, not available in shared workers and normal service workers.	Edge – Partial support Edge 79 – 117 (Release date: 2020-01-15) footnote Partial support footnote Available in dedicated workers, not available in shared workers and service workers. Edge – Partial support Edge 118 (Release date: 2023-10-13) footnote Partial support footnote Available in dedicated workers and WebExtension service workers, not available in shared workers and normal service workers.	Firefox – No support Firefox footnote No support	Opera – Partial support Opera 57 – 103 (Release date: 2018-11-28) footnote Partial support footnote Available in dedicated workers, not available in shared workers and service workers. Opera – Partial support Opera 104 (Release date: 2023-10-23) footnote Partial support footnote Available in dedicated workers and WebExtension service workers, not available in shared workers and normal service workers.	Safari – No support Safari footnote No support	Chrome Android – Partial support Chrome Android 70 – 117 (Release date: 2018-10-17) footnote Partial support footnote Available in dedicated workers, not available in shared workers and service workers. Chrome Android – Partial support Chrome Android 118 (Release date: 2023-10-10) footnote Partial support footnote Available in dedicated workers and WebExtension service workers, not available in shared workers and normal service workers.	Firefox for Android – No support Firefox for Android footnote No support	Opera Android – Partial support Opera Android 49 – 78 (Release date: 2018-12-07) footnote Partial support footnote Available in dedicated workers, not available in shared workers and service workers. Opera Android – Partial support Opera Android 79 (Release date: 2023-12-06) footnote Partial support footnote Available in dedicated workers and WebExtension service workers, not available in shared workers and normal service workers.	Safari on iOS – No support Safari on iOS footnote No support	Samsung Internet – Partial support Samsung Internet 10 – 24 (Release date: 2019-08-22) footnote Partial support footnote Available in dedicated workers, not available in shared workers and service workers. Samsung Internet – Partial support Samsung Internet 25 (Release date: 2024-04-24) footnote Partial support footnote Available in dedicated workers and WebExtension service workers, not available in shared workers and normal service workers.	WebView Android – No support WebView Android footnote footnote WebView exposes `navigator.usb`, but does not support WebUSB. footnote See bug 41441927	WebView on iOS – No support WebView on iOS footnote No support	Deno – No support Deno footnote No support
`userAgent`	Chrome – Full support Chrome 4 (Release date: 2010-01-25) footnote Full support	Edge – Full support Edge 12 (Release date: 2015-07-29) footnote Full support	Firefox – Full support Firefox 3.5 (Release date: 2009-06-30) footnote Full support	Opera – Full support Opera 12.1 (Release date: 2012-11-20) footnote Full support	Safari – Full support Safari 4 (Release date: 2009-06-08) footnote Full support	Chrome Android – Full support Chrome Android 18 (Release date: 2012-06-27) footnote Full support	Firefox for Android – Full support Firefox for Android 4 (Release date: 2011-03-29) footnote Full support	Opera Android – Full support Opera Android 12.1 (Release date: 2012-10-09) footnote Full support	Safari on iOS – Full support Safari on iOS 5 (Release date: 2011-10-12) footnote Full support	Samsung Internet – Full support Samsung Internet 1 (Release date: 2013-04-27) footnote Full support	WebView Android – Full support WebView Android 4.4 (Release date: 2013-12-09) footnote Full support	WebView on iOS – Full support WebView on iOS 5 (Release date: 2011-10-12) footnote Full support	Deno – No support Deno footnote No support
`userAgentData` Experimental	Chrome – Full support Chrome 90 (Release date: 2021-04-13) footnote Full support	Edge – Full support Edge 90 (Release date: 2021-04-15) footnote Full support	Firefox – No support Firefox footnote No support	Opera – Full support Opera 76 (Release date: 2021-04-28) footnote Full support	Safari – No support Safari footnote No support	Chrome Android – Full support Chrome Android 90 (Release date: 2021-04-13) footnote Full support	Firefox for Android – No support Firefox for Android footnote No support	Opera Android – Full support Opera Android 64 (Release date: 2021-05-25) footnote Full support	Safari on iOS – No support Safari on iOS footnote No support	Samsung Internet – Full support Samsung Internet 15 (Release date: 2021-08-13) footnote Full support	WebView Android – No support WebView Android footnote footnote See bug 40609350	WebView on iOS – No support WebView on iOS footnote No support	Deno – No support Deno footnote No support

Tip: you can click/tap on a cell for more information.

Full support: Full support
Partial support: Partial support
In development. Supported in a pre-release version.: In development. Supported in a pre-release version.
No support: No support
: Experimental. Expect behavior to change in the future.
: See implementation notes.
: User must explicitly enable this feature.
: Has more compatibility info.

WorkerNavigator

Instance properties

Instance methods

Specifications

Browser compatibility

Legend

See also