title: how to use sizzle.js separate
body: <p>I downloaded sizzle.js from <a href="https://github.com/jquery/sizzle" rel="noreferrer">https://github.com/jquery/sizzle</a>
  my code is:</p>
  
  <pre><code>&lt;!DOCTYPE html&gt;
  &lt;html&gt;
  &lt;head&gt;
      &lt;title&gt;Demo&lt;/title&gt;
      &lt;meta http-equiv="Content-Type" content="text/html; charset=utf-8" /&gt;
      &lt;script src="sizzle.js" type="text/javascript"&gt;&lt;/script&gt;
      &lt;script type="text/javascript"&gt;
          window.onload=load;
          function load(){
              alert(Sizzle("#test"));
              alert(Sizzle("#test").innerHTML);
          }
      &lt;/script&gt;
  &lt;/head&gt;
  &lt;body&gt;
  &lt;div id="test"&gt;abc&lt;/div&gt;
  &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>
  
  <p>but alert "[object]", "undefined", please tell me what's wrong with my code?</p>