In many ePubs that I own, the headers (<h1> etc.) and paragraphs (<p>) of the page content are wrapped in an division element (<div>), e.g.:
Code:
<html>
...
<body>
<div>
<h1>Chapter Heading</h1>
<p>The text of the chapter.</p>
</div>
</body>
</html>
Sometimes the <body> and <div> are styled, usually defining margins, sometimes they are both unstyled.
What are the advantages and disadvantages of wrapping my page content in a <div>, and (why) should I do it?