Header with class

**My Markdown**

A header with 

```markdown
# Miscellaneous features
{: .hide-from-excerpt}
```

**TOC Usage**

```liquid
{% include toc.html html=content %}
```

**Actual TOC**

```html
<a href="#hide-from-excerpt">1 class=”hide-from-excerpt” id=”miscellaneous-features”&gt;Miscellaneous features</a>
```