This manifests as the writer switches to or from a headline. This would give an A-sized head. This starts main text, which is all 2-column under present style. This tag must appear at the start of every paragraph and anywhere else you would normally indent. Our current page style uses all 2-column text, with some boxed content.
Boxed content needs a different style of headline.
This would give a C-sized head formatted to be in a box. This is the preferred size for most box heads. This would give a D-sized head formatted to be in a box. This size is used for subheads in boxes. This starts the boxed main text.