Michael
I had difficulty understanding it myself.
I suppose what I am trying to do is to configure Pure Tabs so it looks like a slider with the header tabs running the width of the page. If I position the tabs to the left the width of the tabs is just the length of the tab description.
I though that the Puretabs attribute would make the tab the full width. There is an option called Header with values of none, list, full. Not sure what this does and how I could use it.