A print output operation tag will take a parameter and will print the data to the screen. These cannot be used as variables.
Example:
{% include_css(“style.css") %}
Output:
<link rel="stylesheet" type="text/css" href="//cdn1.leadcommerce.com/files/f/b25lLmxjZGV2LmNv/default_theme/css/style.css?4194107" media="screen" />