Can I override the title attributes on an H2 tag within a specific drupal region or block?
You can use CSS to style the H2 tag inside a specific block.

Your block should have a unique ID, based on the name of the block.

Your CSS would look something like this:

&lt;style&gt;
#block-your-blockname h2 {
 color: white !important;
}
&lt;/style&gt;


Note: you may not need "!important", and that CSS can go in your main CSS file if you want.