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@Component({
  selector: 'app-tabs',
  template: `<ng-content></ng-content>`
})
export class TabsComponent implements OnInit {
  @ContentChild(TabComponent) tab: TabComponent;

  ngAfterContentInit() {
    setTimeout(() => {
      this.tab.content = 'Content'; 
    }, 3000);
  }
}

@Component({
  selector: 'app-tab',
  template: `{{content}}`,
  changeDetection: ChangeDetectionStrategy.OnPush
})
export class TabComponent {
  @Input() content;
}

<app-tabs>
  <app-tab></app-tab>
</app-tabs>