[css3-grid-layout] Missing placement-scoping bullet for subgrids.

Author: fantasai

css3-grid-layout/Overview.html

@@ -966,10 +966,15 @@ <h3 id=subgrids-the-subgrid-display-value><span class=secno>3.2.
     ‘<code class=property>grid-row-span</code>’ of the item is determined
     by the number of grid rows and grid columns it contains.
 
-   <li> Its own grid items participate in the sizing of its parent grid and
-    are aligned to it. In this process, the sum of the item's margin,
-    padding, and borders are applied as an extra layer of margin to the items
-    at those edges.
+   <li> The <a href="#grid-placement-properties"><i>grid-placement
+    properties</i></a> are scoped to the tracks covered by the subgrid:
+    numeric indices count starting from the first line of the subgrid rather
+    than the first line of the parent grid.
+
+   <li> The subgrid's own grid items participate in the sizing of its parent
+    grid and are aligned to it. In this process, the sum of the item's
+    margin, padding, and borders are applied as an extra layer of margin to
+    the items at those edges.
   </ul>
 
   <div class=example>

css3-grid-layout/Overview.src.html

@@ -646,9 +646,14 @@ <h3>Subgrids: the ''subgrid'' 'display' value</h3>
 
 		<li>
 			The used 'grid-column-span' and 'grid-row-span' of the item is determined by the number of grid rows and grid columns it contains.
+			
+		<li>
+			The <i>grid-placement properties</i> are scoped to the tracks covered by the subgrid:
+			numeric indices count starting from the first line of the subgrid
+			rather than the first line of the parent grid.
 
 		<li>
-			Its own grid items participate in the sizing of its parent grid and are aligned to it.
+			The subgrid's own grid items participate in the sizing of its parent grid and are aligned to it.
 			In this process, the sum of the item's margin, padding, and borders are applied as an extra layer of margin to the items at those edges.
 	</ul>