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navigatorOnLine

The NavigatorOnLine interface contains methods and properties related to the connectivity status of the browser.

There is no object of type NavigatorOnLine, but other interfaces, like Navigator or WorkerNavigator, implement it.

The NavigatorOnLine interface doesn't inherit any property.

NavigatorOnLine.onLine Read only: Returns a Boolean indicating whether the browser is working online.

The NavigatorOnLine interface neither implements, nor inherit any method.

Specification	Status	Comment
HTML Living Standard The definition of 'NavigatorOnLine' in that specification.	Living Standard	No change from the latest snapshot, HTML5
HTML5 The definition of 'NavigatorOnLine' in that specification.	Recommendation	Snapshot of HTML Living Standard with its initial specification.

	Desktop
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari
Basic support	Yes	?	Yes	Yes	Yes	Yes
Support on `WorkerNavigator`	?	?	29	?	?	?
`onLine`	Yes Yes Earlier versions of Chrome incorrectly return true when a tab is first opened, but it starts reporting the correct connectivity status after the first network event. Windows: 11, Mac: 14, Chrome OS: 13, Linux: Always returns `true`. For history, see crbug.com/7469.	Yes	3.5 3.5 Since Firefox 4 the browser returns `true` when 'Work Offline' mode is disabled and `false` when it is enabled, regardless of actual connectivity. 4 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`).	8 8 in Internet Explorer 8 'online' and 'offline' events are raised on the `document.body`; under IE 9 they are raised on both `document.body` and `window`.	No No Since Opera 11.10, the browser returns `true` when 'Work Offline' mode is disabled and `false` when it is enabled, regardless of actual connectivity.	5

	Mobile
	Android webview	Chrome for Android	Edge Mobile	Firefox for Android	Opera for Android	iOS Safari	Samsung Internet
Basic support	Yes	Yes	?	Yes	Yes	Yes	?
Support on `WorkerNavigator`	?	29	?	35	?	?	?
`onLine`	Yes Yes Faulty in a WebView component, see Issue bug 16760.	Yes	Yes	4	?	Yes	?