HTML filtered out in text type

I'm new to variable, so bare with me. I'm using the domain variable module to create domain-specific settings (like global header block, terms of use, etc).

Here's an example variable that I would like to use for a "global domain link":

$variable['domain_linktest'] = array(
'title' => t('Link Test', array(), $options),
'type' => 'string',
'multidomain' => TRUE,
'default' => t('', array(), $options),
);

The variable shows up under each domain and I'm able to add HTML to it (e.g. a global logo image with link), however, the style and classes don't appear to be passing. It seems that only the basic HTML syntax is passing though. So teh raw image shows up, but the size and other class data is not reflecting in the output.

Any ideas?