[css-grid] Correct minor inconsistencies in grid-placement def

--HG--
extra : rebase_source : c0d038911d329c3b6e34b1c6948d2f8ee716da39

Author: tabatkins

css-grid/Overview.html

@@ -1547,8 +1547,7 @@ <h4 id=subgrids><span class=secno>5.1.4. </span> Subgrids: the ‘<a
     href="#track-size-auto"><code class=css>auto</code></a>’, the number of
     tracks is determined by the size of the <a
     href="#subgrid0"><i>subgrid</i></a>’s <a
-    href="#implicit-grid"><i>implicit grid</i></a>, which is defined to also
-    be the <a href="#explicit-grid"><i>explicit grid</i></a>.
+    href="#implicit-grid"><i>implicit grid</i></a>.
 
    <li> The <a href="#grid-placement-properties"><i>grid-placement
     properties</i></a> of the <a href="#subgrid0"><i>subgrid</i></a>’s <a
@@ -2501,14 +2500,22 @@ <h3 id=line-placement><span class=secno>7.1. </span> Line-based Placement:
    class=property>grid-column-end</code></a>’ properties (collectively, the
    <dfn id=grid-placement-properties
    title="grid-placement property|grid-placement properties">grid-placement
-   properties</dfn>) specify, respectively, the <i>before</i>, <i>start</i>,
-   <i>after</i>, and <i>end</i> <a href="#grid-line"><i>grid lines</i></a> of
-   a <a href="#grid-item"><i>grid item</i></a>’s <a
-   href="#grid-area"><i>grid area</i></a>. In each dimension (row or column),
-   they resolve to either a specific pair of lines (specifying a position and
-   implying a <a href="#grid-span"><i>grid span</i></a>), or just a <a
-   href="#grid-span"><i>grid span</i></a> (implying <i>auto-placement</i> in
-   that dimension).
+   properties</dfn>) specify, respectively, the <i>block-start</i>,
+   <i>inline-start</i>, <i>block-end</i>, and <i>inline-end</i> <a
+   href="#grid-line"><i>grid lines</i></a> of a <a href="#grid-item"><i>grid
+   item</i></a>’s <a href="#grid-area"><i>grid area</i></a>.
+
+  <p> In each dimension (row or column), they resolve to either a specific
+   pair of lines (yielding an <dfn id=explicit-grid-position>explicit grid
+   position</dfn> and <dfn id=explicit-grid-span>explicit grid span</dfn>),
+   or just an <a href="#explicit-grid-span"><i>explicit grid span</i></a> and
+   an <dfn id=automatic-grid-position>automatic grid position</dfn> (implying
+   <i>auto-placement</i> in that dimension). If the item is a <a
+   href="#subgrid0"><i>subgrid</i></a> in that dimension, it could
+   alternatively have an <dfn id=automatic-grid-span>automatic grid
+   span</dfn>, with either an <a href="#automatic-grid-position"><i
+   title="automatic grid position">automatic</i></a> or <a
+   href="#explicit-grid-position"><i>explicit grid position</i></a>.
 
   <p> Values have the following meanings:
 
@@ -4056,6 +4063,12 @@ <h2 class=no-num id=index> Index</h2>
    <li>auto, <a href="#track-size-auto"
     title="section 5.1."><strong>5.1.</strong></a>
 
+   <li>automatic grid position, <a href="#automatic-grid-position"
+    title="section 7.1."><strong>7.1.</strong></a>
+
+   <li>automatic grid span, <a href="#automatic-grid-span"
+    title="section 7.1."><strong>7.1.</strong></a>
+
    <li>AvailableSpace, <a href="#AvailableSpace-definition"
     title="section 9.1."><strong>9.1.</strong></a>
 
@@ -4081,6 +4094,12 @@ <h2 class=no-num id=index> Index</h2>
    <li>explicit grid, <a href="#explicit-grid"
     title="section 5."><strong>5.</strong></a>
 
+   <li>explicit grid position, <a href="#explicit-grid-position"
+    title="section 7.1."><strong>7.1.</strong></a>
+
+   <li>explicit grid span, <a href="#explicit-grid-span"
+    title="section 7.1."><strong>7.1.</strong></a>
+
    <li><var>&lt;flex></var>, <a href="#ltflex"
     title="section 5.1."><strong>5.1.</strong></a>
 

css-grid/Overview.src.html

@@ -1110,8 +1110,7 @@ <h4 id="subgrids">
 			The number of explicit tracks is given by its <i>grid span</i>,
 			rather than by 'grid-template-rows'/'grid-template-columns'.
 			If the <i>grid span</i> is ''auto'',
-			the number of tracks is determined by the size of the <i>subgrid</i>’s <i>implicit grid</i>,
-			which is defined to also be the <i>explicit grid</i>.
+			the number of tracks is determined by the size of the <i>subgrid</i>’s <i>implicit grid</i>.
 
 		<li>
 			The <i>grid-placement properties</i> of the <i>subgrid</i>’s <i>grid items</i>
@@ -1880,11 +1879,17 @@ <h3 id='line-placement'>
 	<p>
 		The 'grid-row-start', 'grid-column-start', 'grid-row-end', and 'grid-column-end' properties
 		(collectively, the <dfn title="grid-placement property|grid-placement properties">grid-placement properties</dfn>)
-		specify, respectively, the <i>before</i>, <i>start</i>, <i>after</i>, and <i>end</i>
+		specify, respectively, the <i>block-start</i>, <i>inline-start</i>, <i>block-end</i>, and <i>inline-end</i>
 		<i>grid lines</i> of a <i>grid item</i>’s <i>grid area</i>.
+
+	<p>
 		In each dimension (row or column), they resolve to either
-		a specific pair of lines (specifying a position and implying a <i>grid span</i>),
-		or just a <i>grid span</i> (implying <i>auto-placement</i> in that dimension).
+		a specific pair of lines (yielding an <dfn>explicit grid position</dfn> and <dfn>explicit grid span</dfn>),
+		or just an <i>explicit grid span</i> and an <dfn>automatic grid position</dfn>
+		(implying <i>auto-placement</i> in that dimension).
+		If the item is a <i>subgrid</i> in that dimension,
+		it could alternatively have an <dfn>automatic grid span</dfn>,
+		with either an <i title="automatic grid position">automatic</i> or <i>explicit grid position</i>.
 
 	<p>
 		Values have the following meanings: