[css-grid] The grid-placement props apply to absposes too, per http://lists.w3.org/Archives/Public/www-style/2014Nov/0215.html

Author: tabatkins

css-grid/Overview.bs

@@ -1991,7 +1991,7 @@ Line-based Placement: the 'grid-row-start', 'grid-column-start', 'grid-row-end',
 	Name: grid-row-start, grid-column-start, grid-row-end, grid-column-end
 	Value: <<grid-line>>
 	Initial: auto
-	Applies to: <a>grid items</a>
+	Applies to: <a>grid items</a> and absolutely-positioned boxes whose containing block is a <a>grid container</a>
 	Inherited: no
 	Percentages: n/a
 	Media: visual
@@ -2133,7 +2133,7 @@ Placement Shorthands: the 'grid-column', 'grid-row', and 'grid-area' properties<
 	Name: grid-row, grid-column
 	Value: <<grid-line>> [ / <<grid-line>> ]?
 	Initial: see individual properties
-	Applies to: <a>grid items</a>
+	Applies to: <a>grid items</a> and absolutely-positioned boxes whose containing block is a <a>grid container</a>
 	Inherited: see individual properties
 	Percentages: see individual properties
 	Media: visual
@@ -2155,7 +2155,7 @@ Placement Shorthands: the 'grid-column', 'grid-row', and 'grid-area' properties<
 	Name: grid-area
 	Value: <<grid-line>> [ / <<grid-line>> ]{0,3}
 	Initial: see individual properties
-	Applies to: <a>grid items</a>
+	Applies to: <a>grid items</a> and absolutely-positioned boxes whose containing block is a <a>grid container</a>
 	Inherited: see individual properties
 	Percentages: see individual properties
 	Media: visual