[DRAFT] Header cells and captions

Functional images are those that carry out an action, like those in a link or on a button. In this case the text alternative for an image needs to convey the action that will be initiated rather than to describe the image itself. For example the text alternative should be "print" rather than "image of a

Here's a very simple table, simple enough to need only the cells in the top row marked up as <th> cells. This is partly because it is such a small table and partly because the data itself is distinctly different in each column. Providing semantic header cells will forge a relationship between the column header and data cells in the same column.

Concert Dates

Date	Event	Venue
12 Feb	Waltz with Strauss	Main Hall
24 Mar	The Obelisks	West Wing
14 Apr	The What	Main Hall

Code snippet

Full code example for using <th> and <caption>