[css-grid] Editorial rearrangement of the grid-template-rows/cols value definitions.

Author: fantasai

css-grid/Overview.bs

@@ -996,26 +996,41 @@ Track Sizing: the 'grid-template-rows' and 'grid-template-columns' properties</h
 	These properties specify,
 	as a space-separated <dfn export>track list</dfn>,
 	the line names and <a>track sizing functions</a> of the <a>grid</a>.
-	Each <dfn lt="track sizing function|sizing function">track sizing function</dfn> can be specified as a length,
-	a percentage of the <a>grid container</a>’s size,
-	a measurement of the contents occupying the column or row,
-	or a fraction of the free space in the grid.
-	It can also be specified as a range using the ''minmax()'' notation,
-	which can combine any of the previously mentioned mechanisms
-	to specify separate <a lt="min track sizing function">min</a>
-	and <a>max track sizing functions</a> for the column or row.
-
 	The 'grid-template-columns' property specifies the <a>track list</a> for the grid's columns,
 	while 'grid-template-rows' specifies the <a>track list</a> for the grid's rows.
 
-	The <dfn value for="grid-template-rows, grid-template-columns">none</dfn> value indicates that there is no <a>explicit grid</a>;
-	any rows/columns will be implicitly generated,
-	and their size will be determined by the 'grid-auto-rows' and 'grid-auto-columns' properties.
+	Values have the following meanings:
+
+	<dl dfn-type="value" dfn-for="grid-template-rows, grid-template-columns">
+		<dt><dfn>none</dfn>
+		<dd>
+			This value indicates that there is no <a>explicit grid</a>;
+			any rows/columns will be <a href="#implicit-grids">implicitly generated</a>,
+			and their size will be determined by the 'grid-auto-rows' and 'grid-auto-columns' properties.
 
-	The <dfn value for="grid-template-rows, grid-template-columns">subgrid</dfn> value indicates that the grid will align to its parent grid in that axis.
-	Rather than specifying the sizes of rows/columns explicitly,
-	they'll be taken from the parent grid's definition.
-	See [[#subgrids]].
+		<dt><dfn id="track-listing"><<track-list>> | <<auto-track-list>></dfn>
+		<dd>
+			Specifies the <a>track list</a> as a series of <a>track sizing functions</a>
+			and line names.
+			Each <dfn dfn lt="track sizing function|sizing function">track sizing function</dfn> can be specified as a length,
+			a percentage of the <a>grid container</a>’s size,
+			a measurement of the contents occupying the column or row,
+			or a fraction of the free space in the grid.
+			It can also be specified as a range using the ''minmax()'' notation,
+			which can combine any of the previously mentioned mechanisms
+			to specify separate <a lt="min track sizing function">min</a>
+			and <a>max track sizing functions</a> for the column or row.
+
+		<dt><dfn id="subgrid-listing">subgrid <<line-name-list>></dfn>
+		<dd>
+			The <dfn value for="grid-template-rows, grid-template-columns">subgrid</dfn> value
+			indicates that the grid will adopt the spanned portion of its parent grid in that axis.
+			Rather than being specified explicitly, the sizes of the grid rows/columns
+			will be taken from the parent grid's definition.
+			See [[#subgrids]].
+
+			The <<line-name-list>> argument allows local naming of the grid lines propagated from the parent grid.
+	</dl>
 
 	The syntax of a <a>track list</a> is: