{% if maxcount is not defined %}
    {% set maxcount = (articles|length) + 1 %}
{% endif %}
<ul>
{% for p in articles|slice(0,maxcount) %}
  {# If the page isn't visible, don't show it... #}
  {% if not p.header.visible is defined or p.header.visible %}
    <li>
    <a href="{{p.url}}">{{ p.title|e }}</a>
    </li>
  {% endif %}
{% endfor %}
</ul>