[css-inline-3] Specify position of initial letter (not just its size). #735

Author: fantasai

css-inline-3/Overview.bs

@@ -619,13 +619,25 @@ Layout Model</h4>
 			See <a href="https://github.com/w3c/csswg-drafts/issues/310">discussion</a>.
 
 		<li>
-			The initial letter's margin box is placed at the edge of the line.
+			In the <a>inline axis</a>,
+			the initial letter's margin box is placed at the start edge of the line.
 			If it has no padding or borders, it is negatively offset
 			by the distance from the start edge of its content box
 			to the point in the content that would have been placed
 			at the start edge of the containing block
 			if it had ''initial-letter: none''.
 
+			In the <a>block axis</a>,
+			the initial letter is anchored to the dominant baseline
+			of the <a>first formatted line</a>,
+			positioned with respect to that baseline
+			such that it would sink the number of lines
+			specified by 'initial-letter'’s second argument
+			if its containing block held only
+			the <a>initial letter</a> itself
+			followed by an infinite sequence of plain text
+			as the direct contents of its <a>root inline box</a>.
+
 		<li>
 			Exclude content within the inline letter's margin box
 			according to 'initial-letter-wrap'.