{% macro deferred_icon(src, alt, width) %}
  {% if not imgAlreadyDeferred(src) %}
    {# Defer image loading. #}
    <img class="icon deferred" src="{{ PLACEHOLDER_ICON }}"
         data-src="{{ src }}" title="{{ alt or '' }}" alt="{{ alt or '' }}"
         height="{{ width or 60 }}" width="{{ width or 60 }}" itemprop="image">
  {% else %}
    <img class="icon" src="{{ src }}" title="{{ alt or '' }}" alt="{{ alt or '' }}"
         height="{{ width or 64 }}" width="{{ width or 64 }}" itemprop="image">
  {% endif %}
{% endmacro %}