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

Window: confirm() method - Web APIs

Window: confirm() method

Baseline Widely available

window.confirm() instructs the browser to display a dialog with an optional message, and to wait until the user either confirms or cancels 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 confirm or cancel the dialog.

Syntax
confirm()
confirm(message)
Parameters
message Optional

A string you want to display in the confirmation dialog.

Return value

A boolean indicating whether OK (true) or Cancel (false) was selected. If a browser is ignoring in-page dialogs, then the returned value is always false.

Examples Confirming before an action

The following example shows how to check the returned value of a confirmation dialog. When the user clicks the OK button, we call window.open(), and if the user clicks Cancel, we print some text to a <pre> element.

<button id="windowButton">Open new tab</button>
<pre id="log"></pre>
const windowButton = document.querySelector("#windowButton");
const log = document.querySelector("#log");

windowButton.addEventListener("click", () => {
  if (window.confirm("Do you want to open in new tab?")) {
    window.open("https://developer.mozilla.org/en-US/docs/Web/API/Window/open");
  } else {
    log.innerText = "Glad you're staying!";
  }
});
Notes

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 a modal window. Alternatively, a <dialog> element can be used for confirmations.

Specifications Browser compatibility See also

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