flasky/app/templates/_comments.html

<ul class="comments">
    {% for comment in comments %}
    <li class="comment">
        <div class="comment-thumbnail">
            <a href="{{ url_for('.user', username=comment.author.username) }}">
                <img class="img-rounded profile-thumbnail" src="{{ comment.author.gravatar(size=40) }}">
            </a>
        </div>
        <div class="comment-content">
            <div class="comment-date">{{ moment(comment.timestamp).fromNow() }}</div>
            <div class="comment-author"><a href="{{ url_for('.user', username=comment.author.username) }}">{{ comment.author.username }}</a></div>
            <div class="comemnt-body">
            {% if comment.body_html %}
                {{ comment.body_html | safe }}
            {% else %}
                {{ comment.body }}
            {% endif %}
            </div>
        </div>
    </li>
    {% endfor %}
</ul>