Dialog tag example

dilogSnippet.html

<dialog>
  <p>This is da dialog!</p>
  <button id="close">Close</button>
</dialog>
<button id="show">Open Dialog!</button>
<script>
  var dialog = document.querySelector('dialog');
  document.querySelector('#show').onclick = function() {
    dialog.show();
  };
  document.querySelector('#close').onclick = function() {
    dialog.close();
  };
</script>