Controlling whitespace in 11ty with Nunjucks

TIL today if you are using Nunjucks for your 11ty templating language, then you can strip all whitespace in HTML loop output using a hypen either site of the statement (so at the end of the opening nunjucks tag and the start of the closing tag).

So this:

{% if tags %}
    {% for tag in tags %}
        <a href="/blog/on/{{ tag | safe }}/" class="tag">{{ tag }}</a>
    {% endfor %}
{% endif %}

becomes this:

{% if tags -%}
    {% for tag in tags -%}
        <a href="/blog/on/{{ tag | safe }}/" class="tag">{{ tag }}</a>
    {%- endfor %}
{%- endif %}

and all whitespace is removed. Super useful for CSS styling where whitespace matters. Nice!