a[ion-button] button

a[ion-button][small] button[ion-button][small]

a[ion-button][outline][small] button[ion-button][outline][small]

a[ion-button][clear][small] button[ion-button][clear][small]

[large] H E L L O

a[ion-button][outline][large] button[ion-button][outline][large]

a[clear][large] button[ion-button][clear][large]