JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://dev.sencha.com/deploy/ext-4.0.2a/resources/css/ext-all.css">

JavaScript

Ext.create('Ext.form.Panel', {
    title: 'Contact Info',
    width: 300,
    bodyPadding: 10,
    renderTo: Ext.getBody(),
    items: [{
        xtype: 'textfield',
        name: 'name',
        fieldLabel: 'Name',
        labelStyle: 'background-color: #ddd1;',
        allowBlank: false  // requires a non-empty value
    }, {
        xtype: 'textfield',
        name: 'email',
        fieldLabel: 'Email Address',
        labelStyle: 'background-color: #f00;',
        vtype: 'email'  // requires value to be a valid email address format
    }]
});