JSFiddle - React, Tailwind, and code Playground

HTML

<div id="draggable" class="ui-widget-content">
    <p>Drag me to my target</p>
</div>

<div id="droppable" class="ui-widget-header">
    <p>accept: '#draggable'</p>
</div>

CSS

#droppable { width: 150px; height: 150px; padding: 0.5em; float: left; margin: 10px; }
#draggable, #draggable-nonvalid { width: 100px; height: 100px; padding: 0.5em; float: left; margin: 10px 10px 10px 0; }

JavaScript

$("#draggable, #draggable-nonvalid").draggable({ revert: function(event, ui) {
            // on older version of jQuery use "draggable"
            // $(this).data("draggable")
            // on 2.x versions of jQuery use "ui-draggable"
            // $(this).data("ui-draggable")
            $(this).data("uiDraggable").originalPosition = {
                top : 0,
                left : 0
            };
            // return boolean
            return !event;
            // that evaluate like this:
            // return event !== false ? false : true;
        } });

$("#droppable").droppable({
    accept: '#draggable',
    activeClass: 'ui-state-hover',
    hoverClass: 'ui-state-active',
    drop: function(event, ui) {
        $(this).addClass('ui-state-highlight').find('p').html('Dropped!');
    }
});