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

<ion-toolbar>
  <ion-title>Default Buttons</ion-title>
</ion-toolbar>

<ion-content padding style="text-align:center">

  <p>
    <button><span>Default</span></button>
    <button class="activated">Default.activated</button>
  </p>

  <p>
    <button class="button-primary">Primary</button>
    <button class="button-primary activated">Primary.activated</button>
  </p>

  <p>
    <button class="button-secondary">Secondary</button>
    <button class="button-secondary activated">Secondary.activated</button>
  </p>

  <p>
    <button class="button-danger">Danger</button>
    <button class="button-danger activated">Danger.activated</button>
  </p>

  <p>
    <button class="button-light">Light</button>
    <button class="button-light activated">Light.activated</button>
  </p>

  <p>
    <button class="button-dark">Dark</button>
    <button class="button-dark activated">Dark.activated</button>
  </p>

</ion-content>