Semantic HTML and Search Engine Optimization
So what is POSH? No, it's not just some new clothing fashion hype amongst web designers - POSH is the acronym for Plain Old Semantic HTML. The term Semantic HTML is used for a variety of things, but it has it's origin in one objective: creating (X)HTML documents using semantic elements and attributes, as opposed to using presentational HTML.
De Valk, Joost. Opera (2008). Articles>Web Design>Standards>Search Engine Optimization