title: multiple ids aria-labelledby Internet Exporer 11 issue
body: <p>We are checking the accessibility of the following code sample in various browsers like IE 11, Mozilla Fire Fox etc using JAWS</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;HTML&gt;
  
  &lt;head&gt;
    &lt;title&gt;Test Page&lt;/title&gt;
  
    &lt;body&gt;
      &lt;form&gt;
  
        &lt;label id="group1" tabIndex="-1"&gt;Sandwich Condiments&lt;/label&gt;
        &lt;input type="checkbox" aria-labelledby="label1 group1"&gt;
        &lt;label id="label1"&gt;Lettuce&lt;/label&gt;
        &lt;/input&gt;
  
        &lt;input type="checkbox" aria-labelledby="label2 group1"&gt;
        &lt;label id="label2"&gt;Tomato&lt;/label&gt;
        &lt;/input&gt;
  
        &lt;input type="checkbox" aria-labelledby="label3 group1"&gt;
        &lt;label id="label3"&gt;Mustard&lt;/label&gt;
        &lt;/input&gt;
  
        &lt;input type="checkbox" aria-labelledby="label4 group1"&gt;
        &lt;label id="label4"&gt;Sprouts&lt;/label&gt;
        &lt;/input&gt;
      &lt;/form&gt;
    &lt;/body&gt;
  
  &lt;/html&gt;</code></pre>
  </div>
  </div>
  </p>
  
  <p>In Mozilla FireFox , when we tab to a check box  for ex- Lettuce , it is read as <strong>Lettuce Sandwich Condiments checkbox  checked/ unchecked</strong></p>
  
  <p>where as in Internet Explorer, it is read as <strong>Lettuce checkbox  checked/ unchecked</strong> . The Sandwich Condiments is omitted, so it is becoming difficult to provide a context to users.</p>
  
  <p>Any idea how this can be resolved</p>