[css-inline-3] Split up normative and informative statements about the height of an inline box.

Author: fantasai

css-inline-3/Overview.bs

@@ -1345,6 +1345,7 @@ Inline Box Heights: the 'inline-sizing' property</h3>
 	is measured in relation to its contents.
 	It has no effect on the size or position of the box’s contents,
 	the line box, or any other content.
+
 	Values have the following meanings:
 
 	<dl dfn-for="inline-sizing" dfn-type=value>
@@ -1353,6 +1354,20 @@ Inline Box Heights: the 'inline-sizing' property</h3>
 			The <a>content area</a> of the <a>inline box</a>
 			is sized and position to fit (possibly hypothetical) text
 			from its [=first available font=].
+			This specification does not specify how.
+			A UA may, e.g., use the the maximum ascender and descender of the font.
+			(This would ensure that glyphs with parts above or below the em-box
+			still fall within the content area,
+			but leads to differently sized boxes for different fonts.)
+
+			Note: If more than one font is used
+			(which happen when glyphs are found in different fonts),
+			the [=logical height=] of the [=content area=] is not affected
+			by the glyphs from the fallback fonts,
+			and only depends on the [=first available font=].
+			However, these fallback glyphs can still affect the [=line box=] size
+			when 'line-height' is ''line-height/normal'';
+			see [[#inline-height]].
 
 		<dt><dfn>stretch</dfn>
 		<dd>
@@ -1365,25 +1380,11 @@ Inline Box Heights: the 'inline-sizing' property</h3>
 			coincide with the line box’s edges.
 	</dl>
 
-	The 'height' property does not apply to [=inline boxes=].
-	The height of the content area should be based on the font,
-	but this specification does not specify how.
-	A UA may, e.g., use the the maximum ascender and descender of the font.
-	(This would ensure that glyphs with parts above or below the em-box
-	still fall within the content area,
-	but leads to differently sized boxes for different fonts.)
-
-	The vertical padding, border and margin of an inline, non-replaced box
-	start at the top and bottom of the content area,
-	and has nothing to do with the 'line-height'.
-	But only the 'line-height' is used when calculating
-	the height of the line box.
-
-	If more than one font is used
-	(this could happen when glyphs are found in different fonts),
-	the height of the content area is not affected
-	by the glyphs from the fallback fonts,
-	and only depends on the first available font.
+	Note: The 'height' property does not apply to [=inline boxes=].
+
+	Note: The 'line-height' has no impact on the size of an [=inline box=],
+	it only [[#inline-height|affects its contribution]]
+	to the [=logical height=] of its [=line box=].
 
 <h2 id="initial-letter-styling">
 <!--<a name="Initial"></a>-->