[css-inline-3] Make sunken initial letters align the same as raised ones. #5207

Author: fantasai

css-inline-3/Overview.bs

@@ -2162,7 +2162,7 @@ Alignment Within an Initial Letter Box</h4>
 Initial Letter Positioning and Spacing</h3>
 
 <h4 id="initial-letter-block-position">
-Block-axis Positioning and Kerning</h4>
+Block-axis Positioning</h4>
 
 	In the <a>block axis</a>, the <a>initial letter</a> is positioned
 	with respect to the [=line box=] in which it [=originates=]
@@ -2208,13 +2208,9 @@ Block-axis Positioning and Kerning</h4>
 	to shift further away from that edge.
 
 <h4 id="initial-letter-inline-position">
-Inline Positioning and Kerning</h4>
+Inline Kerning</h4>
 
-	In the <a>inline axis</a>, the position of the inline letter
-	is given by matching its <a>inline-start</a> <a>margin edge</a>
-	with the <a>inline-start</a> edge of the line box.
-
-	However, if the <a>initial letter</a> is a non-atomic inline
+	If the <a>initial letter</a> is a non-atomic inline
 	with an [=automatic size|automatic=] [=inline size=] and
 	zero padding and borders,
 	it is negatively offset
@@ -2442,26 +2438,14 @@ Line Layout</h3>
 <h4 id="initial-letter-inline-flow">
 Inline Flow Layout: Alignment, Justification, and White Space</h4>
 
-	For a <a>raised initial</a>
-	no special consideration is given
-	for alignment, justification, or white space processing:
-	it is handled similar to any other inline-level content.
-
-	However, for a <a>sunken initial</a>
-	its inline-start edge is anchored to the inline-start edge
-	of the line box (after indentation)
-	and text alignment affects the remaining content of the line
-	in the remaining space,
-	without moving the <a>initial letter box</a> itself.
-
-	Note: The CSSWG was not aware of any reasonable use cases
-	for mixing non-start text alignment with dropped initial letters,
-	and this was the most sensible behavior proposed.
-	This behavior may be reconsidered if use cases require otherwise.
+	An [=initial letter box=] is handled similar to any other
+	[=inline-level=] content participating in its [=originating line box=],
+	including participation in alignment, justification,
+	and white space processing.
 
-	In addition, to ensure consistent alignment of all the impacted lines,
+	However, to ensure consistent alignment of all the impacted lines,
 	[=collapsible=] [=document white space=]
-	between the [=sunken initial=] and subsequent content on its [=originating line=]
+	between a [=sunken initial=] and subsequent content on its [=originating line=]
 	is collapsed away,
 	and any 'letter-spacing' or <a>justification opportunity</a>
 	that would normally be introduced by