and still more...
The first web browser was graphical. It was a NeXTStep application written by Tim Berners-Lee.
(I don't think he meant layoutless, but I could be wrong!)
Layout is essential in many ways. If it wasn't important CSS wouldn't exist. I don't think hypertext or hyperlinking in HTML suffers because of tables of lack of semantic structure, but it sure could if you're talking XML.