fuel/core — pull request #925 by aaaaron (2012-04-20 18:51:02+00:00)
Title: Add another value to the substitutions that template() understands. 

This allows the container for fields to be identified uniquely, which can be required for doing more complex layouts with CSS. I'd prefer to have found a descriptor for each field that didn't include form_ in the name, but the general idea works. There is no parent selector in CSS.