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Showing content from https://webplatform.github.io/docs/dom/BeforeUnloadEvent/returnValue below:

returnValue · WebPlatform Docs

Gets or sets a value that indicates whether to warn the user prior to navigating away from a page.

Property of dom/BeforeUnloadEventdom/BeforeUnloadEvent

var returnValue = event.returnValue;
event.returnValue = preventNavigationReason;

Returns an object of type StringString

The text that will be shown to the user.

window.onbeforeunload = function (e) {
    e.returnValue = "About to navigate away from this page";
};

 The BeforeUnloadEvent allows you to warn a user who is navigating away from a page or closing the browser. Set the return value to false or a string value to cancel the document unload event. You can also return a string or Boolean value from the event handler to display a message to the user, who is asked to confirm that they want to unload the document.

HTML5

Working Draft

WHATWG HTML

Living Standard

• Microsoft Developer Network: [Windows Internet Explorer API reference Article]

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