1.6.3.1.1 Block level elements

A block element can contain a mixture of text and inline elements.

<p>

A paragraph of text

<h1>, <h2>, <h3>

A heading. The three levels of heading correspond to three levels of importance and define a hierarchical structure to the document. Please note that while an <h1> is the most important definition within the markup block, it should not necessarily be utilised for the title of the description which should be handled by the <Title> element in the containing <Description>.