apps/codelab/src/app/components/breadcrumb/breadcrumb.component.html
<h1>
<a routerLink="/">Angular Codelab</a> {{ separator }}
<span [matMenuTriggerFor]="menu">
{{ active }} <span class="arrow">▼</span>
</span>
{{ separator }}
<ng-content></ng-content>
</h1>
<mat-menu #menu="matMenu">
<a
*ngFor="let milestone of menuRoutes"
#link="routerLinkActive"
routerLinkActive
mat-menu-item
[disabled]="link.isActive"
[routerLink]="['../..', milestone.path]"
>{{ milestone.name }}
</a>
</mat-menu>