SEO-SPA: Browser DI Service

element-focus.browser.service.ts

import { ElementFocusService } from './element-focus.service';
import { Injectable, ElementRef } from '@angular/core';

@Injectable()
export class ElementFocusBrowserService extends ElementFocusService {

  constructor() {
    super();
   }

   public focusElement(element: ElementRef) {
     element.nativeElement.focus();
   }
}