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

HTMLDialogElement: show() method - Web APIs

Baseline Widely available

The show() method of the HTMLDialogElement interface displays the dialog modelessly, i.e., still allowing interaction with content outside of the dialog.

None.

None (undefined).

InvalidStateError DOMException

Thrown if the dialog is already open and modal (i.e., if the dialog has already been opened with HTMLDialogElement.showModal()).

The following example shows a simple button that, when clicked, opens a <dialog> containing a form via the show() method. From there you can click the Cancel 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">
    <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 id="cancel" type="reset">Cancel</button>
      <button type="submit">Confirm</button>
    </menu>
  </form>
</dialog>

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

<script>
  (() => {
    const updateButton = document.getElementById("updateDetails");
    const cancelButton = document.getElementById("cancel");
    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 modeless dialog
    updateButton.addEventListener("click", () => {
      dialog.show();
      openCheck(dialog);
    });

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

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

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