ionic-framework/ionic/components/button/test/clear/main.html

<div>
  <a button clear href="#">a[button][clear]</a>
  <button clear>button[clear]</button>
  <button clear class="hover">hover</button>
  <button clear class="activated">activated</button>
</div>

<div>
  <a button clear primary href="#">a.primary</a>
  <button clear primary>button.primary</button>
  <button clear primary class="hover">hover</button>
  <button clear primary class="activated">activated</button>
</div>

<div>
  <a button clear secondary href="#">a.secondary</a>
  <button clear secondary>button.secondary</button>
  <button clear secondary class="hover">hover</button>
  <button clear secondary class="activated">activated</button>
</div>

<div>
  <a button clear danger href="#">a.danger</a>
  <button clear danger>button.danger</button>
  <button clear danger class="hover">hover</button>
  <button clear danger class="activated">activated</button>
</div>

<div>
  <a button clear light href="#">a.light</a>
  <button clear light>button.light</button>
  <button clear light class="hover">hover</button>
  <button clear light class="activated">activated</button>
</div>

<div>
  <a button clear stable href="#">a.stable</a>
  <button clear stable>button.stable</button>
  <button clear stable class="hover">hover</button>
  <button clear stable class="activated">activated</button>
</div>

<div>
  <a button clear dark href="#">a.dark</a>
  <button clear dark>button.dark</button>
  <button clear dark class="hover">hover</button>
  <button clear dark class="activated">activated</button>
</div>