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

HTMLDialogElement: close() method - Web APIs

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The close() method of the HTMLDialogElement interface closes the <dialog>. An optional string may be passed as an argument, updating the returnValue of the dialog.

close()
close(returnValue)

returnValue Optional

A string representing an updated value for the HTMLDialogElement.returnValue of the dialog.

None (undefined).

The following example shows a simple button that, when clicked, opens a <dialog> containing a form via the showModal() method. From there you can click the X button to close the dialog (via the HTMLDialogElement.close() method), or submit the form via the submit button.

<!-- Simple pop-up dialog box, containing a form -->
<dialog id="favDialog">
  <form method="dialog">
    <button id="close" aria-label="close" formnovalidate>X</button>
    <section>
      <p>
        <label for="favAnimal">Favorite animal:</label>
        <select id="favAnimal" name="favAnimal">
          <option></option>
          <option>Brine shrimp</option>
          <option>Red panda</option>
          <option>Spider monkey</option>
        </select>
      </p>
    </section>
    <menu>
      <button type="reset">Reset</button>
      <button type="submit">Confirm</button>
    </menu>
  </form>
</dialog>

<menu>
  <button id="updateDetails">Update details</button>
</menu>

<script>
  (() => {
    const updateButton = document.getElementById("updateDetails");
    const closeButton = document.getElementById("close");
    const dialog = document.getElementById("favDialog");
    dialog.returnValue = "favAnimal";

    function openCheck(dialog) {
      if (dialog.open) {
        console.log("Dialog open");
      } else {
        console.log("Dialog closed");
      }
    }

    // Update button opens a modal dialog
    updateButton.addEventListener("click", () => {
      dialog.showModal();
      openCheck(dialog);
    });

    // Form close button closes the dialog box
    closeButton.addEventListener("click", () => {
      dialog.close("animalNotChosen");
      openCheck(dialog);
    });
  })();
</script>

If the "X" button was of type="submit", the dialog would have closed without requiring JavaScript. A form submission closes the <dialog> it is nested within if the form's method is dialog, so no "close" button is required.

• The HTML element implementing this interface: <dialog>.

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