# Advanced interactivity
## In this section
* Use enrichment information to dynamically adjust the styles for displayed content.
## Highlighting tagged provisions
Our final piece of interactivity will add an option to highlight provisions that have been tagged with a particular enrichment.
We're going to build the following:
* A dropdown that lets the user choose one of the enrichments.
* When an item is chosen, dim all the text of the document, except those portions that have the chosen enrichment.
Add a new button beneath the `btn-comment` button in `expression_detail.html`:
{% code title="expression\_detail.html" %}
```markup
# ...
```
{% endcode %}
Add a new javascript block to populate the dropdown from the items in the gutter, and handles the interactivity when an item is chosen.
{% code title="expression\_detail.html" %}
```html
```
{% endcode %}
Finally, let's add the necessary styling to handle the new `.highlight` and `.highlighting` classes.
Add this block in the `` tag of `expression_detail.html`.
{% code title="expression\_detail.html" %}
```markup
```
{% endcode %}
Load the page and choose an item from the dropdown:
