InvenTree/docs/_includes/img.html

{% if 'http' in url %}
{% set img_url = url %}
{% else %}
{% set img_url = config.assets_dir + '/images/' + url %}
{% endif %}

<figure class='image image-inventree'>
    {% if id %}
    <!-- The link that, when clicked, will display the image in full screen -->
    <a href="#{{ id }}">
    {% elif img_url %}
    <a href="{{ img_url }}">
    {% endif %}
        <img class='img-inline' src='{{ img_url }}' alt='{{ description }}' title='{{ description }}'
        {% if maxwidth or maxheight %}style='
        {% if maxwidth %} max-width:{{ maxwidth }};{% endif %}
        {% if maxheight %} max-height: {{ maxheight }};{% endif %}
        '{% endif %}
        >
    {% if id or img_url %}
    </a>
    {% endif %}

    {% if id %}
    <!-- The full screen image, hidden by default  -->
    <a href="#_" class="overlay" id="{{ id }}">
      <img src="{{ img_url }}" alt="{{ description }}" />
    </a>
    {% endif %}
</figure>