apps/codelab/src/app/components/slides-preview/codelab-preview.component.html
<div
data-step="3"
data-intro="You can reference the slides for this milestone here."
data-position="top"
class="codelab-preview"
[class.expanded]="isExpanded"
>
<div class="preview-header">
<button class="button-expand" (click)="expandToggle()"></button>
</div>
<div class="body">
<iframe *ngIf="milestone" [src]="iframeSource"></iframe>
</div>
</div>