How to display a comma-separated list of multiple field values? How can I render for example each taxonomy terms value as an inline comma-separated list (or add between each of them a "/" Character) in my field template field--node--field-tags.html.twig file or even visually with css?
While it's possible to use CSS for this I think it's better to avoid it. I've simplified the field twig file to illustrate, but it would look something like this:

{% for item in items %}
  {% if loop.last %}
    {% set separator = '' %}
  {% else %}
    {% set separator = '/' %}
  {% endif %}
  {{ item.content }}{{ separator }}
{% endfor %}