[css-grid-1][editorial] Incorporate note about placement-before-sizing into the grid layout algorithm steps.

Author: tabatkins

css-grid-1/Overview.bs

@@ -3782,21 +3782,25 @@ Grid Layout Algorithm</h2>
 	and lays out the [=grid items=]
 	which have been [=grid item placement algorithm|placed=] into its [=grid areas=].
 
-	1. First, find the size of the [=grid container=],
+	1. Run the [=Grid Item Placement Algorithm=]
+		to resolve the placement of all [=grid items=]
+		in the [=grid=].
+
+	2. Find the size of the [=grid container=],
 		per [[#intrinsic-sizes]].
 
 		Note: During this phase,
 		cyclic <<percentage>>s in track sizes are treated as ''grid-template-columns/auto''.
 
-	2. Given the resulting [=grid container=] size,
+	3. Given the resulting [=grid container=] size,
 		run the [=Grid Sizing Algorithm=]
 		to size the [=grid=].
 
 		Note: During this phase,
 		<<percentage>>s in track sizes are resolved
 		against the [=grid container=] size.
 
-	3. Lay out the [=grid items=] into their respective containing blocks.
+	4. Lay out the [=grid items=] into their respective containing blocks.
 		Each [=grid area's=] width and height
 		are considered [=definite=] for this purpose.
 

css-grid-2/Overview.bs

@@ -4334,21 +4334,26 @@ Grid Layout Algorithm</h2>
 	and lays out the [=grid items=]
 	which have been [=grid item placement algorithm|placed=] into its [=grid areas=].
 
-	1. First, find the size of the [=grid container=],
+	1. Run the [=Grid Item Placement Algorithm=]
+		to resolve the placement of all [=grid items=]
+		(including [=subgrids=] and their sub-items)
+		in the [=grid=].
+
+	2. Find the size of the [=grid container=],
 		per [[#intrinsic-sizes]].
 
 		Note: During this phase,
 		cyclic <<percentage>>s in track sizes are treated as ''grid-template-columns/auto''.
 
-	2. Given the resulting [=grid container=] size,
+	3. Given the resulting [=grid container=] size,
 		run the [=Grid Sizing Algorithm=]
 		to size the [=grid=].
 
 		Note: During this phase,
 		<<percentage>>s in track sizes are resolved
 		against the [=grid container=] size.
 
-	3. Lay out the [=grid items=] into their respective containing blocks.
+	4. Lay out the [=grid items=] into their respective containing blocks.
 		Each [=grid area's=] width and height
 		are considered [=definite=] for this purpose.
 
@@ -4358,10 +4363,6 @@ Grid Layout Algorithm</h2>
 		the size of a grid item which is stretched
 		is also considered definite.
 
-	Note: Placement of all [=grid items=],
-	including [=subgrids=] and their sub-items,
-	occurs before sizing.
-
 
 <h3 id="algo-grid-sizing" dfn export>
 Grid Sizing Algorithm</h3>