JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.9.0/themes/base/jquery-ui.css">
<div id="asdasd" style="float:left;width:300px; height:400px; border:1px solid red; position:relative">
    <div id="testxxx" style="width:30px;height:30px;position:absolute;top:48.9px;left:10px;border:1px solid #000"></div>
</div>

JavaScript

$(function() {
     $('#asdasd').append(JSON.stringify($('#testxxx').position()));

    $('#testxxx').resizable({
        stop:function(){
            $('#asdasd').append(JSON.stringify($(this).position()));
        }
    });

});