I was asked to create a presentation at work on an aspect of the new HTML 5 specification, so I decided to investigate the
new semantic elements in HTML5, which allow developers to structure documents for parsing by other applications. Particularly useful in this respect are the article, header; footer, section and hgroup elements, which allow you to divide documents up into articles and sections, and group headings together for parsing into a table of contents. It also means that you can have more than one h1 on a page.
Further reading