JSFiddle - React, Tailwind, and code Playground

HTML

<div style="display: none" id="dialog">Was spricht dagegen den Content vorher schon in den DIV zu schreiben?</div>
<input id="btn_dialog" type="button" value="Dialog öffnen"/>

CSS

/*!
 * jQuery UI CSS Framework 1.8.21
 *
 * Copyright 2012, 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 !important; clip: rect(1px 1px 1px 1px); clip: rect(1px,1px,1px,1px); }
.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:before, .ui-helper-clearfix:after { content: ""; display: table; }
.ui-helper-clearfix:after { clear: both; }
.ui-helper-clearfix { zoom: 1; }
.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 1.8.21
 *
 * Copyright 2012, 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

$(function(){
    var $dialog = $('#dialog').dialog({ 
        autoOpen: false,
        title: 'Dies ist ein Dialog-Test',
        buttons: { 
            "Ok": function() { 
                //...do something
                $(this).dialog("close"); 
            },
            "Cancel": function() { 
                $(this).dialog("close"); 
            }
        }
    });
    $('#btn_dialog')
        .button()
        .click(function (){
            $dialog
                .html('Lalala Content ändere dich! Wusch!')
                .dialog('open');            
        })
    
})