[css-grid] Specify that between-track spacing (gutters, alignment) must be suppressed if there's a fragment break.

Author: tabatkins

css-grid/Overview.bs

@@ -27,6 +27,10 @@ Link Defaults: css21 (property) margin/min-height/max-height/min-width/max-width
 At Risk: the ''grid-template-rows/subgrid'' value of 'grid-template-columns' and 'grid-template-rows', and its component parts individually
 </pre>
 
+<pre class="link-defaults">
+spec:css-break-3; type:dfn; text:fragment
+</pre>
+
 <style type="text/css">
 .example {
 	clear:both
@@ -3013,6 +3017,9 @@ Gutters: the 'grid-column-gap', 'grid-row-gap', and 'grid-gap' properties</h3>
 	See [[#algo-overview]].
 	This space effectively increases the size of the <a>gutters</a>.
 
+	If a <a>grid</a> is <a>fragmented</a> between tracks,
+	the <a>gutter</a> spacing between those tracks must be suppressed.
+
 	<pre class='propdef'>
 	Name: grid-gap
 	Value: <<'grid-row-gap'>> <<'grid-column-gap'>>?
@@ -3117,6 +3124,8 @@ Aligning the Grid: the 'justify-content' and 'align-content' properties</h3>
 	can cause the tracks to be spaced apart
 	(''justify-content/space-around'', ''justify-content/space-between'', ''justify-content/space-evenly'')
 	or to be resized (''&lt;content-distribution>/stretch'').
+	If the <a>grid</a> is <a>fragmented</a> between tracks,
+	any such additional spacing between those tracks must be suppressed.
 
 	Issue: Add example of fixed size spanner getting extra space from content-distribution.