JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://cloud.github.com/downloads/SteveSanderson/knockout/knockout-1.1.2.js"></script>
<span data-bind="text: greetings" />
<input data-bind="value: firstname" />
<input data-bind="value: lastname" />
<span data-bind="text: greetings">Default 2</span>

JavaScript

$(document).ready(function () {
    var dv = document.getElementById('divMain');
    ko.applyBindings(new Vm());
});

function Vm() {
    this.greetings = ko.observable("hello world");
    this.firstname = ko.observable("firstname");
    this.lastname = ko.observable("lastname");
};