<body data-spy="scroll" data-target="#toc">
<nav id="toc" data-toggle="toc">
<ul class="nav flex-column">
<li class="nav-item" >
<a class="nav-link" *ngFor ="let group of dataModel.groups" href="#group.key">{{group.title}}</a>
</li>
</ul>
</nav>
</body>