{% comment %}
The PDF view's download control. Its own partial for the same reason as
_section_download.html: parody_web_annotate shadows it so a reader who has
annotated this section downloads the copy with their marks on it.

A shadow must keep the .pdf-exit shape — icon, then a .pdf-exit-label the bar
hides when it goes compact — and must carry an aria-label, because below
70rem the label is the only name the control has.

With a translation beside the English (`twin`), it downloads what is shown:
the English and translation side by side.

Context: book, chapter, section, pdf_url, twin.
{% endcomment %}
{% if twin and twin.sbs_url %}
<a class="pdf-exit" href="{{ twin.sbs_url }}"
   aria-label="Download this section side by side" title="Download this section side by side">
  {% include "parody_web/_icon.html" with icon="download" %}<span class="pdf-exit-label">Download</span>
</a>
{% else %}
<a class="pdf-exit" href="{{ pdf_url }}"
   aria-label="Download this section" title="Download this section">
  {% include "parody_web/_icon.html" with icon="download" %}<span class="pdf-exit-label">Download</span>
</a>
{% endif %}