Block Level Elements
When you markup your content, there are two types of elements that you use: block and inline.
Block elements are traditionally thought of as paragraphs or breaks in your content flow. For example,
all the header elements (<H1>, <H2>, etc.) are block elements as well as the <P> and
<DIV> elements. The HTML 4.0 specification defines block elements as follows:
Certain HTML elements that may appear in BODY are said to be "block-level" while others are "inline" (also known as "text level"). The distinction is founded on several notions:
Generally, block-level elements may contain inline elements and other block-level elements. Generally, inline elements may contain only data and other inline elements. Inherent in this structural distinction is the idea that block elements create "larger" structures than inline elements.
By default, block-level elements are formatted differently than inline elements. Generally, block-level elements begin on new lines, inline elements do not.
See HTML 4.0 Spec
Over the next few pages, you will be able to experiment with the different block elements defined by
Block Elements - Creating Headers...