[css-grid] Switch row-gap/column-gap to grid-row-gap/grid-column-gap per WG resolution.

Author: fantasai

css-grid/Overview.bs

@@ -1980,7 +1980,7 @@ Grid Definition Shorthand: the 'grid' property</h2>
 	all the implicit grid properties
 	('grid-auto-rows', 'grid-auto-columns', and 'grid-auto-flow'),
 	and the gutter properties
-	('column-gap' and 'row-gap')
+	('grid-column-gap' and 'grid-row-gap')
 	in a single declaration.
 	If <<'grid-auto-rows'>> value is omitted,
 	it is set to the value specified for 'grid-auto-columns'.
@@ -2853,12 +2853,12 @@ Alignment and Spacing</h2>
 	<a>grid items</a> will auto-size to fit their contents.
 
 <h3 id='gutters'>
-Gutters: the 'column-gap', 'row-gap', and 'grid-gap' properties</h3>
+Gutters: the 'grid-column-gap', 'grid-row-gap', and 'grid-gap' properties</h3>
 
 	<pre class='propdef'>
-	Name: row-gap, column-gap
-	Value: normal | <<length>>
-	Initial: normal
+	Name: grid-row-gap, grid-column-gap
+	Value: <<length>>
+	Initial: 0
 	Applies to: <a>grid containers</a>
 	Inherited: no
 	Percentages: n/a
@@ -2879,16 +2879,9 @@ Gutters: the 'column-gap', 'row-gap', and 'grid-gap' properties</h3>
 	See [[#algo-overview]].
 	This space effectively increases the size of the <i>gutters</i>.
 
-	On <a>grid containers</a>, a value of <dfn for="row-gap,column-gap" dfn-type=value>normal</dfn> computes to zero.
-
-	Issue: Should we have grid-specific properties for this (e.g. <css>grid-row-gap</css>)
-	instead of sharing with multicol ('row-gap')?
-	Sharing with multi-col could be problematic if we re-use the 'grid-template'
-	properties to set up <a href="http://www.w3.org/TR/css-line-grid-1/">grid-snapping</a>.
-
 	<pre class='propdef'>
 	Name: grid-gap
-	Value: <<'column-gap'>> <<'row-gap'>>?
+	Value: <<'grid-column-gap'>> <<'grid-row-gap'>>?
 	Initial: normal
 	Applies to: <a>grid containers</a>
 	Inherited: no
@@ -2897,9 +2890,9 @@ Gutters: the 'column-gap', 'row-gap', and 'grid-gap' properties</h3>
 	Computed value: specified value
 	</pre>
 
-	This property is a <a>shorthand</a> that sets 'column-gap' and 'row-gap' in one declaration.
-	If <<'row-gap'>> is omitted,
-	it's set to the same value as <<'column-gap'>>.
+	This property is a <a>shorthand</a> that sets 'grid-column-gap' and 'grid-row-gap' in one declaration.
+	If <<'grid-row-gap'>> is omitted,
+	it's set to the same value as <<'grid-column-gap'>>.
 
 <h3 id='auto-margins'>
 Aligning with <a value for="margin">auto</a> margins</h3>
@@ -3648,10 +3641,18 @@ Acknowledgements</h2>
 <h2 class="no-num" id="changes">
 Changes</h2>
 
+
+	The following significant changes were made since the
+	<a href=http://www.w3.org/TR/2015/WD-css-grid-1-20150317/>17 March 2015 Working Draft</a>.
+
+	* Renamed <css>row-gap</css>/<css>column-gap</css> to 'grid-row-gap'/'grid-column-gap'
+		to avoid having multicol and grid share 'column-gap'.
+		This also preserves <css>'grid-'</css> as a prefix across these properties and their shorthand.
+
 	The following significant changes were made since the
 	<a href=http://www.w3.org/TR/2015/WD-css-grid-1-20150317/>17 March 2015 Working Draft</a>.
 
-	* Defined 'row-gap'/'column-gap' properties and 'grid-gap' shorthand to provide gutters.
+	* Defined <css>row-gap</css>/<css>column-gap</css> properties and 'grid-gap' shorthand to provide gutters.
 	* A <a>subgrid</a> now only ignores width/height/alignment constraints in the subgridded dimension(s).
 	* Made ''repeat(auto)'' pay attention to max size when it's definite, too.
 	* Per WG resolution, switched to using square brackets for <<line-names>>, rather than parentheses.