106. Doctype
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
117. Avoid elements with default margins
<!-- BAD -->
<h1>Headers and paragraphs have default margin styles</h1>
<p>Not all email clients will let you override or zero them out.</p>
118.
119.
120. Font styles on block elements
<div class=”h1”>H1 Header</div>
<div class=”p”>Paragraph...</div>
<table>
<tr>
<td class=”h1”>H1 Header</td>
<td class=”p”>Paragraph...</td>
</tr>
</table>