title: Should aria-expanded attribute take the value true or string "true"?
body: <p>I am setting the aria-expanded attribute's value with jquery. I am confused whether I should do:  </p>
  
  <pre><code>$(".dropdown-toggle").attr("aria-expanded", true);
  </code></pre>
  
  <p>or  </p>
  
  <pre><code>$(".dropdown-toggle").attr("aria-expanded", "true");
  </code></pre>
  
  <p>Should true be treated as a string or simply a javascript data type?</p>