The sandbox tag can be used to enable the sandboxing mode for an included template, when sandboxing is not enabled globally for the Twig environment:
{% sandbox %}
{% include 'user.html' %}
{% endsandbox %}
Warning
The sandbox tag is only available when the sandbox extension is enabled (see the Twig for Developers chapter).
Note
The sandbox tag can only be used to sandbox an include tag and it cannot be used to sandbox a section of a template. The following example won't work:
{% sandbox %}
{% for i in 1..2 %}
{{ i }}
{% endfor %}
{% endsandbox %}
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https://twig.sensiolabs.org/doc/1.x/tags/sandbox.html