[css-grid-2] Swap 'definite/indefinite grid span' for explicit/implicit/automatic, and fix definitions. w3c#6905

Author: tabatkins

css-grid-2/Overview.bs

@@ -2830,15 +2830,17 @@ Placing Grid Items</h2>
 		<dt><dfn export local-lt="span|row span|column span">grid span</dfn>
 		<dd>
 			How many <a>grid tracks</a> the <a>grid item</a> occupies in each axis.
-			In a [=subgridded axis=]
-			if the '*-start' or '*-end' value
-			of its <a>grid-placement properties</a> is ''grid-row-start/auto'',
-			then the [=grid item=] has an <dfn export lt="indefinite grid span|indefinite row span|indefinite column span|indefinite span">indefinite span</dfn>,
-			and is <a href="#subgrid-span">determined</a> from its <<line-name-list>>.
-			Otherwise,
-			a <a>grid item</a>’s <a>grid span</a> is
-			<dfn export lt="definite grid span|definite row span|definite column span|definite span">definite</dfn>,
-			defaulting to 1 in each axis if it can't be otherwise determined for that axis.
+			The [=grid span=] in an axis can be [=implicit grid span|implicit=], [=explicit grid span|explicit=], or [=automatic grid span|automatic=]:
+
+			* If both the '*-start' and '*-end' values
+				of its <a>grid-placement properties</a> specify a line,
+				its [=grid span=] is <dfn export lt="implicit grid span|implicit row span|implicit column span|implicit span">implicit</dfn>.
+			* If it has an explicit ''grid-row-start/span'' value,
+				its [=grid span=] is <dfn export lt="explicit grid span|explicit row span|explicit column span|explicit span">explicit</dfn>.
+			* Otherwise, its [=grid span=] is <dfn export lt="automatic grid span|automatic row span|automatic column span|automatic span">automatic</dfn>:
+				if is [=subgridded=] in that axis,
+				its [=grid span=] is <a href="#subgrid-span">determined</a> from its <<line-name-list>>;
+				otherwise its [=grid span=] is 1.
 	</dl>
 
 	The <dfn export lt="grid-placement property">grid-placement properties</dfn>--
@@ -2869,25 +2871,6 @@ Placing Grid Items</h2>
 
 	A definite value for any two of <var>Start</var>, <var>End</var>, and <var>Span</var> in a given dimension implies a definite value for the third.
 
-	The following table summarizes the conditions under which a grid position or span is <i lt>definite</i> or <i lt>automatic</i>:
-
-	<table class='data'>
-		<thead>
-			<tr>
-				<td>
-				<th>Position
-				<th>Span
-		<tbody>
-			<tr>
-				<th>Definite
-				<td>At least one specified line
-				<td>Explicit, implicit, or defaulted span.
-			<tr>
-				<th>Automatic
-				<td>No lines explicitly specified
-				<td>N/A
-	</table>
-
 
 
 <h3 id='common-uses'>
@@ -3541,13 +3524,13 @@ Subgrids</h2>
 
 			<ul>
 				<li>
-					If the <a>subgrid</a>’s <a>grid span</a> in the subgridded dimension is definite,
+					If the <a>subgrid</a>’s <a>grid span</a> in the subgridded dimension is [=explicit grid span|explicit=] or [=implicit grid span|implicit=],
 					then the number of explicit tracks in each subgridded dimension
 					is taken from its used <a>grid span</a> in that dimension
 					(regardless of its 'grid-template-*' properties).
 
 				<li>
-					If it has an [=indefinite grid span=]
+					If it has an [=automatic grid span=],
 					then its used <a>grid span</a> is taken
 					from the number of explicit tracks specified for that axis
 					by its 'grid-template-*' properties,