This is the content that is being included via a partial template. The partial template is a JS template, and the partial is being defined using the Drupal.cl.template.get() method. To see the JS templates in play, do a view->source on your browser and search for the "fe_partial_demo" and "fe_partial_demo_inc" templates on this page. The combined output is being injected into the ".aaa-fe-partial-demo-v1 .output" div.