s="block">Return the size of the content of this part in bytes.
 Return -1 if the size cannot be determined. <p>

 Note that the size may not be an exact measure of the content
 size and may or may not account for any transfer encoding
 of the content. The size is appropriate for display in a 
 user interface to give the user a rough idea of the size
 of this part.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>size of content in bytes</dd>
<dt><span class="throwsLabel">Throws:</span></dt