matrix-dimension/web/app/widget-wrappers/generic/generic.component.html

<div class="wrapper">
    <div class="control-page" *ngIf="isLoading || !canEmbed">
        <div class="loading-badge" *ngIf="isLoading">
            <my-spinner></my-spinner>
        </div>
        <div class="embed-failed" *ngIf="!isLoading && !canEmbed">
            <p class="ban"><i class="fa fa-ban"></i></p>
            <h4>{{'Sorry, this content cannot be embedded' | translate}}</h4>
        </div>
    </div>
    <iframe [src]="embedUrl" *ngIf="!isLoading && canEmbed" frameborder="0" allowfullscreen></iframe>
    <my-fullscreen-button *ngIf="!isLoading && canEmbed" class="toggleFullscreen"></my-fullscreen-button>
</div>