<p>
  <button class="default">Button</button>
  <a href="" role="button" class="default">Link as a button</a>
  <button class="button" disabled>Disabled button</button>
</p>

<p>
  <button>Button</button>
  <a href="" role="button">Link as a button</a>
  <input type="button" value="Search">
  <button disabled>Disabled button</button>
</p>

Add an input[type='button'] to the Button examples
Add an input[type='button'] to the Button examples
