What does the hyphen mean for a block in Twig like in {% block body -%}?

Question

When generating a CRUD in a Symfony2 application with Doctrine commands, generated Twig template content is defined within a Twig block this way:

{% block body -%}

{% endblock %}

What does the hyphen in -%} mean? It works fine without the hyphen and I could not find anything similar in the Twig documentation.

Answer 1

The -%} means to trim whitespace.

See the Whitespace Control section of the docs.