The entire document should be wrapped in an
<article>, ideally with a
<header>. A second
class="SHORTTITLE" can be used to display a vertical title in the top‑right of the page on supporting browsers ; this title must be a link. It is recommended you use
<a href="#">, so that it links to the top of the page.
Main document contents should be in
<section>s inside of a
<div class="BODY">. In browsers which support them, these sections will be given “ sticky ” headings if the window is tall enough. At most five sections are supported, for reasons of space and stylesheet simplicity.
There is a particular way of marking up section headings to get them to turn into links ; see the source of this page for a demonstration.
It is known that the section numbering is sometimes incorrect in Safari ; this presumably has to do with the way Webkit optimizes large pages and fails to update its counters as they are processed.