In Drupal 7, I have created a subtheme from Zen which I am - whenever I have some spare time - slowly developing into the custom theme for one of my websites. Obviously this is a learning experience although I do have a little experience from Drupal 6 several years back.
I have installed Firebug under Firefox and am using it to look at various properties of one of the pages I am theming. My footer message shows an id of "block-block-1" - which I have then used to assign the appropriate CSS property values. I would, however, like to understand where/how that id is generated and did a grep of the entire website looking for that particular id. I only found it in the Zen theme and in my derived subtheme, not in any particular Drupal file.
Could someone who knows Drupal 7 better tell me where that particular id is generated for the footer message?
Thanks.