JSFiddle - React, Tailwind, and code Playground

HTML

<button id="dialog">OPEN DIALOG</button><br/><br/>
<div id="resize1" style="width: 100px; height: 100px; border: 1px solid red;">RESIZABLE 1 WITH HELPER SET AT INIT TIME</div><br/><br/>
<div id="resize2" style="width: 100px; height: 100px; border: 1px solid green;">RESIZABLE 2 WITH HELPER SET AFTER INIT</div>

CSS

/*
 * jQuery UI CSS Framework 1.8.6
 *
 * Copyright 2010, AUTHORS.txt (http://jqueryui.com/about)
 * Dual licensed under the MIT or GPL Version 2 licenses.
 * http://jquery.org/license
 *
 * http://docs.jquery.com/UI/Theming/API
 */

/* Layout helpers
----------------------------------*/
.ui-helper-hidden { display: none; }
.ui-helper-hidden-accessible { position: absolute; left: -99999999px; }
.ui-helper-reset { margin: 0; padding: 0; border: 0; outline: 0; line-height: 1.3; text-decoration: none; font-size: 100%; list-style: none; }
.ui-helper-clearfix:after { content: "."; display: block; height: 0; clear: both; visibility: hidden; }
.ui-helper-clearfix { display: inline-block; }
/* required comment for clearfix to work in Opera \*/
* html .ui-helper-clearfix { height:1%; }
.ui-helper-clearfix { display:block; }
/* end clearfix */
.ui-helper-zfix { width: 100%; height: 100%; top: 0; left: 0; position: absolute; opacity: 0; filter:Alpha(Opacity=0); }


/* Interaction Cues
----------------------------------*/
.ui-state-disabled { cursor: default !important; }


/* Icons
----------------------------------*/

/* states and images */
.ui-icon { display: block; text-indent: -99999px; overflow: hidden; background-repeat: no-repeat; }


/* Misc visuals
----------------------------------*/

/* Overlays */
.ui-widget-overlay { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }


/*
 * jQuery UI CSS Framework 1.8.6
 *
 * Copyright 2010, AUTHORS.txt (http://jqueryui.com/about)
 * Dual licensed under the MIT or GPL Version 2 licenses.
 * http://jquery.org/license
 *
 * http://docs.jquery.com/UI/Theming/API
 *
 * To view and modify this theme, visit...

JavaScript

$('#dialog').click(function() {
    $('<div style="width: 300px; overflow: hidden;"><iframe src="http://www.google.com" frameborder="0" width="100%" height="100%"/></div>').dialog({
        width: 300,
        resizable: true
    }).dialog('widget').resizable('option','helper','ui-resizable-helper');
});

$('#resize1').resizable({
    helper: 'ui-resizable-helper'
});

$('#resize2').resizable();
$('#resize2').resizable("option","helper","ui-resizable-helper");