{{ block.super }}
"If you need to get the content of the block from the parent template, the {{ block.super }} variable will do the trick. This is useful if you want to add to the contents of a parent block instead of completely overriding it. Data inserted using {{ block.super }} will not be automatically escaped (see the next section), since it was already escaped, if necessary, in the parent template."
А я как-то просмотрел эту возможность. Источник - reddit
http://docs.djangoproject.com/en/dev/topics/templates/#template-inheritance
