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

HTMLDialogElement: showModal() method - Web APIs

Baseline Widely available

The showModal() method of the HTMLDialogElement interface displays the dialog as a modal, over the top of any other dialogs that might be present. It displays in the top layer, along with a ::backdrop pseudo-element. Elements inside the same document as the dialog, except the dialog and its descendants, become inert (as if the inert attribute is specified). Only the containing document becomes blocked; if the dialog is rendered inside an iframe, the rest of the page remains interactive.

None.

None (undefined).

InvalidStateError DOMException

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

The following example shows a button that, when clicked, opens a modal <dialog> containing a form via the HTMLDialogElement.showModal() function. While open, everything other than the modal dialog's contents is inert. From there you can click the Cancel button to close the dialog (via the HTMLDialogElement.close() function), or submit the form via the submit button. Selecting the cancel button closes the dialog, creating a close event, not a cancel event.

<!-- pop-up dialog box, containing a form -->
<dialog id="favDialog">
  <form method="dialog">
    <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>
    <div>
      <button id="cancel" type="reset">Cancel</button>
      <button type="submit">Confirm</button>
    </div>
  </form>
</dialog>

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

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 modal dialog
updateButton.addEventListener("click", () => {
  dialog.showModal();
  openCheck(dialog);
});

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

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

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