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The closed property in JavaScript is a read-only property that indicates whether a window is closed or open. This property is a boolean value, with true indicating that the window is closed and false indicating that the window is open.

Here is an example of how the closed property works:

const myWindow = window.open('https://google.com', 'my-window', 'width=800, height=600');

console.log(myWindow.closed);  // logs 'false'

myWindow.close();

console.log(myWindow.closed);  // logs 'true'

In the code example above, we first use the window.open() method to open a new window and navigate to the Google homepage. We store the new window in the myWindow variable.

We then use the console.log() method to log the value of the myWindow.closed property to the console. Since the myWindow window is open, the value of the closed property is false.

We then use the close() method to close the myWindow window. After closing the window, we log the value of the myWindow.closed property to the console again. Since the myWindow window is now closed, the value of the closed property is true.

As a result of using the closed property, we can determine whether a window is open or closed. This can be useful in cases where we want to know whether a window is open or closed, and take appropriate action based on the value of the closed property.