title: Modernizr Feature Detection not running
body: <p>Im having problems with Modernizr. According to the beginner tutorials i have read this html should be all there is to it, but nothing happens. What i expect is for the class of the HTML element to change to reflect what features are available and what features are not. </p>
  
  <p>I have made sure the js file path is correct by adding a Alert("Hello"); and make sure it triggers.</p>
  
  <p>What is missing?</p>
  
  <pre><code>&lt;!DOCTYPE html&gt;
  &lt;html class="no-js"&gt;
  &lt;head&gt;
      &lt;meta charset="utf-8"&gt;
      &lt;title&gt;My Beautiful Sample Page&lt;/title&gt;
      &lt;script src="modernizr.custom.57102.js"&gt;&lt;/script&gt;
  &lt;/head&gt;
  
  &lt;body&gt;
  
  &lt;div &gt;Yo yo yo &lt;/div&gt;
  
  
  &lt;/body&gt;
  &lt;/html&gt; 
  </code></pre>