That Box is showing the
current box. Margins, border, padding
body the contains Block level Tags (boxes):H, div, p (those are the ones I use the most)
The rest are only allowed INSIDE a block level tag. span, b, i, sub, sup (those are the ones I use the most)
You can also nest many block level tags. to create an overall style (container) for the contents.
eg <div class="placetime" > creates a constricted area, bold, italic for Paragraphs stating: Who, Where, When
By doing it that way, all I have to do is adjust .placetime in the CSS and change the overall placement and look.