JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://qrext.googlecode.com/files/qrextV10_min.js"></script>
<link rel="stylesheet" href="http://docs.sencha.com/ext-js/4-0/resources/css/app.css">
Full source and doc <a href="http://code.google.com/p/qrext/" target="_blank">here</a>. Click a code for "fullscreen" display.

JavaScript

Ext.onReady(function() {
    
    Ext.create('Ext.Window', {

        layout: 'column',
        width: 400,
        plain: true,
        border: 0,
        shadow: false, // jsfiddle seems to have a layout quirk here
        autoShow: true,
        items: [{
            columnWidth: 0.90,
           bodyStyle: 'background:transparent',
            border: 0},
        {
            xtype: 'qrpanel',
            textToEncode: 'http://code.google.com/p/qrext/'}]

    });
    
});