JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://cloud.github.com/downloads/SteveSanderson/knockout/knockout-2.0.0.js"></script>
<input type='checkbox' data-bind='checked: isChecked' />

<p data-bind='if: isChecked'>
    <div data-bind='text: sometext'></div>
</p>

JavaScript

var vm = {
    isChecked: ko.observable(false),
    sometext: 'lorem ipsum dolor'
};

ko.applyBindings(vm);