Codebase Browser
chromium
Go to App

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

<!DOCTYPE html>
<html>
<body>

<form>
 <fieldset>
  <legend>Browser Engines:</legend>
 </fieldset>
</form>

<fieldset>
    <legend>
        <h2>Which cake do you prefer?</h2>
    </legend>
</fieldset>

</body>
</html>