moviewyrm/bookwyrm/templates/snippets/tag.html

<div class="control">
    <div class="tags has-addons">
        <a class="tag is-link" href="/tag/{{ tag.identifier|urlencode }}">
            {{ tag.name }}
        </a>
        <div class="tag">
            {% if tag.identifier in user_tags %}
            <form name="tag" action="/untag/" method="post">
                {% csrf_token %}
                <input type="hidden" name="book" value="{{ book.id }}">
                <input type="hidden" name="name" value="{{ tag.name }}">
                <button type="submit">x<span class="is-sr-only"> remove tag</span></button>
            </form>
            {% else %}
            <form name="tag" action="/tag/" method="post">
                {% csrf_token %}
                <input type="hidden" name="book" value="{{ book.id }}">
                <input type="hidden" name="name" value="{{ tag.name }}">
                <button type="submit">+<span class="is-sr-only"> add tag</span></button>
            </form>
            {% endif %}
        </div>
    </div>
</div>