A dropcap is the first one to a few letters of the first word of a paragraph (often the first in a larger unit such as a chapter). It is presented within the normal margins of the paragraph, but it takes up more than one line. It is used to draw the reader's attention.
dropcap is a specialization of ph.
+ topic/ph d4p-formatting-d/dropcap
<p><dropcap>DITA</dropcap>is an XML architecture that allows for new, arbitrary elements to be defined without breaking tooling.</p>