common/src/web/droppableItems.html

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8" />
  <title>jQuery UI Droppable - Default Demo</title>
    <link type="text/css" href="css/ui-lightness/jquery-ui-1.12.1.min.css" rel="stylesheet" />
    <script type="text/javascript" src="js/jquery-3.5.1.min.js"></script>
    <script type="text/javascript" src="js/jquery-ui-1.12.1.min.js"></script>
  <style type="text/css">
  #draggable { width: 100px; height: 100px; padding: 0.5em; float: left; margin: 10px 10px 10px 0; }
  #droppable { width: 150px; height: 150px; padding: 0.5em; float: left; margin: 10px; }
  </style>
  <script type="text/javascript">
    $(function () {
      $("#draggable").draggable();
      $("#droppable").droppable({
        drop: function () {
          $(this).addClass('ui-state-highlight').find('p').html('Dropped!');
        }
      });

      const report_event = function (report_text) {
        const reportElement = $("#drop_reports");
        const origText = reportElement.text();
        reportElement.text(origText + " " + report_text);
      }

      $('body').mousedown(function () {
        report_event('down');
      });

      $('body').mousemove(function () {
        report_event('move');
      });

      $('body').mouseup(function () {
        report_event('up');
      });

      $("#droppable").show();
      $("#draggable").show();
    });
  </script>
</head>
<body>
<div class="demo">

<div id="draggable" class="ui-widget-content" style="display: none;">
  <p>Drag me to my target</p>
</div>

<div id="droppable" class="ui-widget-header" style="display: none;">
  <p>Drop here</p>
</div>

<div class="test-data">
  <p id="drop_reports">start</p>
</div>

</div><!-- End demo -->

<div class="demo-description">

<p>Taken from the JQuery demo.</p>

</div><!-- End demo-description -->
</body>
</html>