title: How to use routing inside mat tabs?
body: <p>I have read the documentation of angular material on <code>mat-tabs</code>. 
  The basic concept of mat-tabs is very easy to understand but the concept where the routing is used inside the mat tabs is some what confusing. </p>
  
  <p>Here's the example that is provided for using routing inside the mat-tabs which is done by using <code>&lt;nav mat-tab-nav-bar&gt;</code></p>
  
  <pre><code>&lt;nav mat-tab-nav-bar&gt;
  
  
   &lt;a mat-tab-link
   *ngFor="let link of navLinks"
   [routerLink]="link.path"
   routerLinkActive #rla="routerLinkActive"
   [active]="rla.isActive"&gt;
  {{link.label}}
    &lt;/a&gt;
  &lt;/nav&gt;
  
  &lt;router-outlet&gt;&lt;/router-outlet&gt;
  </code></pre>
  
  <p>I understood all the properties in this example except the routerLinkActive  property and the rla.isActive value which is given to active property </p>
  
  <p>Can anyone make this concept clear </p>
  
  <p>Thanks in advance :)</p>