Icons <icon home></icon> <icon home is-active="true"></icon> <icon home is-active="false"></icon> <icon name="home"></icon> <icon [name]="homeIcon"></icon> <icon ion-social-twitter></icon> <icon ios="ion-social-apple" md="ion-social-android"></icon> <icon [is-active]="isActive" ios="ion-social-apple" md="ion-social-android"></icon> <icon ios="ion-social-apple"></icon> <icon md="ion-social-android"></icon> ion-item w/ [forward-icon] attr. text text text text text text