I have been told that metadata does not mean as much to the search engines as it did in the past.
The site I am creating does not contain headings because it's mostly illustrations with links so I decided to have a heading in the same color as the background in order to give accessibility to the page.
I wonder if I can do it loosely in a child div or if I should indent the heading -9999px in the parent. And also if font size would count as a criteria for the SE.
Check out this tutorial which is fairly recent (April 2013). It is long, but contains LOTS of great info.