use a proper switch

Author: tabatkins

css-position-4/Overview.bs

@@ -104,30 +104,32 @@ with its top left corner at the canvas origin.
 		given the descendant and |canvas|.
 
 	1.
-		: If |root| is an [=inline-level=] box
-		:: For each line box |root| is in,
-			[=paint a box in a line box=]
-			given |root|,
-			the line box,
-			and |canvas|.
-
-		: Otherwise
-		:: First for |root|,
-			then for all its in-flow, non-positioned, [=block-level=] descendant boxes,
-			in [=tree order=]:
-
-			1. If the box is a [=replaced element=],
-				paint the replaced content into |canvas|, atomically.
-
-			2. Otherwise, for each line box of the box,
+		<dl class=switch>
+			: If |root| is an [=inline-level=] box
+			:: For each line box |root| is in,
 				[=paint a box in a line box=]
-				given the box,
+				given |root|,
 				the line box,
 				and |canvas|.
 
-			3. If the UA uses [=in-band outlines=],
-				paint the outlines of the box
-				into |canvas|.
+			: Otherwise
+			:: First for |root|,
+				then for all its in-flow, non-positioned, [=block-level=] descendant boxes,
+				in [=tree order=]:
+
+				1. If the box is a [=replaced element=],
+					paint the replaced content into |canvas|, atomically.
+
+				2. Otherwise, for each line box of the box,
+					[=paint a box in a line box=]
+					given the box,
+					the line box,
+					and |canvas|.
+
+				3. If the UA uses [=in-band outlines=],
+					paint the outlines of the box
+					into |canvas|.
+		</dl>
 
 	1. For each of |root|'s positioned descendants
 		with ''z-index: auto'' or ''z-index: 0'',