Output variables in October are automatically escaped, the | raw filter marks the value as being "safe" and will not be escaped if raw is the last filter applied.

{# This variable won't be escaped #}
{{ variable | raw }}

Be careful when using the raw filter inside expressions:

{% set hello = '<strong>Hello</strong>' %}
{% set hola = '<strong>Hola</strong>' %}

{{ false ? '<strong>Hola</strong>' : hello | raw }}

{# The above will not render the same as #}
{{ false ? hola : hello | raw }}

{# But renders the same as #}
{{ (false ? hola : hello) | raw }}

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