JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.0.4/css/bootstrap-combined.min.css">
    <div class="navbar navbar-inverse navbar-fixed-top">
      <div class="navbar-inner">
        <div class="container">
          <a class="btn btn-navbar" data-toggle="collapse" data-target=".nav-collapse">
            <span class="icon-bar"></span>
            <span class="icon-bar"></span>
            <span class="icon-bar"></span>
          </a>
          <a class="brand" href="#">Project name</a>
          <div class="nav-collapse collapse">
            <ul class="nav">
              <li id="some-nav-link" class="active"><a href="#">Home</a></li>
              <li><a href="#about">About</a></li>
              <li><a href="#contact">Contact</a></li>
            </ul>
          </div><!--/.nav-collapse -->
        </div>
      </div>
    </div>

    <div class="container">

      <h1>Bootstrap starter template</h1>
      <p>Use this document as a way to quick start any new project.<br> All you get is this message and a barebones HTML document.</p>

    </div> <!-- /container -->

JavaScript

$('body').append('<span>Is visible? - '+$('#some-nav-link').is(':visible')+'</span>');