Current content can be placed here. THis will be crawlable and also can get indexed in search engines. Problem is when it is indexed, you will a link from a search result going directly to this content alone without no other design elements nor navigation going back to the complete page.
See how this page looks like when directly indexed by a search engine.
If ever you got to this page by accident and has no idea what this page is all about, please visit the complete example on doing SEO for Greybox (Lightbox JS-like content).