medicine

<h1>This is a top level heading</h1> Here is some text.

<H2>Second level heading</H2> Here is some more text.

Use the DIV element together with header elements when you want to make the hierarchical structure of a document explicit. This is needed as header elements themselves only contain the text of the header, and do not imply any structural division of documents into sections. Header elements have the same content model as paragraphs, that is text and character level markup, such as character emphasis, inline images, form fields and math.