[css-inline] Add note to describe advantages of raisied initial over simply using a larger font size for first letter

Author: dauwhe

css-inline/Overview.bs

@@ -295,7 +295,16 @@ Some styles of drop initials do not align with the first line of text. A <dfn>su
 <h4 id="raise-initial">
 Raised Initial Letters</h4>
 
-A <dfn>raised initial</dfn> (often called a “raised cap” or “stick-up cap”) “sinks” to the first text baseline. Unlike simply increasing the font size, which affects the line spacing below it to make room for potential descenders, it does not sink below that.
+A <dfn>raised initial</dfn> (often called a “raised cap” or “stick-up cap”) “sinks” to the first text baseline. 
+
+Note: A proper raised initial has several advantages 
+over simply increasing the font size of a first letter. 
+The line spacing in the rest of the paragraph 
+will not be altered, but text will still be excluded 
+around large descenders. 
+And if the size of raised initial is defined 
+to be an integral number of lines, 
+implicit baseline grids can be maintained.  
 
 
 <figure>