couple of places to try looking. On my learning list 😉
1. The wiki! http://wiki.joomlart.com/wiki/JA_T3_Framework_2/Guides – Look for the ‘block attributes’ and it gives you an idea of the block styles.
2. http://wiki.joomlart.com/wiki/JA_T3_Framework_2/FAQs#Styling_custom_block_styles
e.g.
Block style
Expression: <block name=”top” style=”JAxhtml” …>
Purpose: this parameter sets a module style for all modules inside a block. These styles are defined in the modules.php located in theyour_site/plugins/system/jat3/base-themes/default/html folder, so this way Joomla! can understand how to show the content of the modules. The styles list is:
- no style – the default block setting with no block style defined, only provide support for module class suffixes;
- raw – provides a blank design for modules, no div, no classes;
- xhtml – mostly used for macro blocks like header, middle, footer;
- JAxhtml – provides a clean design for modules;
- JArounded – provides support for rounded corners design for modules.
I hope that helps.