mat-button-toggle selected default code example

Example: mat-button-toggle selected default

<mat-button-toggle-group class="right-aligned" value="book">
  <mat-button-toggle value="italic" value="edit"><mat-icon>edit</mat-icon></mat-button-toggle>
  <mat-button-toggle value="bold" value="book"><mat-icon>import_contacts</mat-icon></mat-button-toggle>
</mat-button-toggle-group>