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chromium/content/test/data/accessibility/html/legend.html 

<!--
@MAC-ALLOW:AXTitleUIElement
@AURALINUX-ALLOW:*-line
@AURALINUX-ALLOW:editable
@AURALINUX-ALLOW:focus*
-->
<!DOCTYPE html>
<html>
<body>

<form>
 <fieldset>
  <legend>Browser Engines:</legend>
  Browser: <input type="text">
  Rendering Engine: <input type="text">
 </fieldset>
</form>

</body>
</html>