Summary:
Indicates that the text within the tags should be rendered with some form of strong emphasis. Authors should attempt to use the strong and em tags in place of the b, i and u tags, except where explicit control over text presentation is required.

Attributes:

Name	Data type	Mandatory	Default	Description
id	String	X		A unique name for the tag within the deck
class	String	X		A name of a class of which the tag is a member
xml:lang	String	X		The natural or formal language of the tag or its attributes

Nested tags:
<em> <b> <i> <u> <big> <small> <br> <img> <anchor> <a> <table>