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The navigator.onLine property in JavaScript represents the online status of the current browser. It is a read-only property that returns a boolean value (true if the browser is online, false if it is not).

Here is an example of how to use the navigator.onLine property:

// check if the current browser is online
if (navigator.onLine == true) {
  // do something if the browser is online
} else {
  // do something if the browser is offline
}

In the above code, we are checking the value of the navigator.onLine property and checking if it is equal to true. If it is, we can execute some code that relies on the browser being online. If not, we can execute some code that handles the case where the browser is offline.

Note that the value of the navigator.onLine property may vary depending on the browser being used and the user’s internet connection. For example, if the user is not connected to the internet, the navigator.onLine property will return false.