e invocation.</p>
<p>For example, this template conditionally shows
properties on <code>person</code> only if that it is present:</p>
<pre class="language-handlebars line-numbers"><code class="handlebars language-handlebars"><span class="token handlebars language-handlebars"><span class="token delimiter punctuation">{{</span><span class="token block keyword">#if</span> <span class="token variable">person</span><span class="token delimiter punctuation">}}</span></span>
  Welcome back, <span class="token tag"