How to add a confirmation before the closing of the tab/browser with JavaScript?

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To add a confirmation before the closing of the tab/browser with JavaScript, we set the window.onbeforeunload property to a function that shows the alert.

For instance, we write

window.onbeforeunload = (e) => {
  return "Sure?";
};

to set window.onbeforeunload to a function that returns a non-empty string.

Then the browser will show an alert box before we close the tab or browser window.

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