JSFiddle - React, Tailwind, and code Playground

HTML

<div id="tar" style="width: 300px; height: 300px; background: #e3e3e3">

</div>

<div id="info"></div>

JavaScript

$(function() {
    $('#tar').selectable({
        stop: function(event, ui) {
            $('#info').html('left: ' + event.offsetX + '<br>' + 'top: ' + event.offsetY);
        }
    });
});