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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/Window/alert below:

Window: alert() method - Web APIs

Baseline Widely available

window.alert() instructs the browser to display a dialog with an optional message, and to wait until the user dismisses the dialog.

Under some conditions — for example, when the user switches tabs — the browser may not actually display a dialog, or may not wait for the user to dismiss the dialog.

message Optional

A string you want to display in the alert dialog, or, alternatively, an object that is converted into a string and displayed.

None (undefined).

window.alert("Hello world!");
alert("Hello world!");

Both produce:

The alert dialog should be used for messages which do not require any response on the part of the user, other than the acknowledgement of the message.

Dialog boxes are modal windows - they prevent the user from accessing the rest of the program's interface until the dialog box is closed. For this reason, you should not overuse any function that creates a dialog box (or modal window).

Alternatively <dialog> element can be used to display alerts.

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