In a nice theoretical web design workflow, designers have complete control over content and the progression of the design. In the real world, those who pay designers demand mockups before providing content. Perhaps there’s a paragraph of legal copy that the designer needs to consider in the layout but won’t actually receive from the legal department until much further down the road. Or maybe the PHP guy needs to test his new page generating script simply to see if it works. There’s also the consideration of blog template designers, who do in fact need to design content containers that work for a variety of different purposes.