[css-grid-2] Remove aspect-ratio-controlled gutters section (deferred to css-align-4).

Author: fantasai

css-grid-2/Overview.bs

@@ -746,91 +746,6 @@ Subgrid Sizing Algorithm</h3>
 		</ol>
 	</div>
 
-<h2 id=alignment>
-Aspect-ratio&ndash;controlled Gutters</h2>
-
-	Issue: There's a desire for having row and column gaps maintain a particular aspect ratio.
-	This is one proposal for doing so; other ideas are welcome.
-	See discussion in <a href="https://github.com/w3c/csswg-drafts/issues/1116">Issue 1116</a>.
-	Note this feature is likely to move to css-align-4,
-	it is just being drafted up here while css-align-3 stabilizes.
-
-	<pre class="propdef partial">
-	Name: align-content, justify-content
-	New values: [ <<transfer-ratio>> <<content-distribution>>? ]
-	</pre>
-
-
-	<dl dfn-for="align-content,justify-content" dfn-type=value>
-		<dt><dfn>&lt;transfer-ratio></dfn>
-		<dd>
-			A <a spec="css-values">dimension</a> with the unit ''tr'',
-			representing a multiplier against the analogous quantity
-			in the other dimension.
-			If that quantity cannot be determined
-			(e.g. is itself specified as a <<aspect-ratio>>, or otherwise can't be referenced),
-			then it is assumed to be zero.
-
-			Note: This value can expand gutters
-			even when there is no free space left,
-			causing overflow.
-
-			Specifically, an 'align-content' value of ''1tr'' represents
-			the amount of space (which may be zero) allocated between two adjacent
-			<a>alignment subjects</a> (<a>grid tracks</a> / <a>flex lines</a> / <a spec="css-multicol">column boxes</a>)
-			by the 'justify-content' property.
-			Unless a different <<content-distribution>> value is specified,
-			space is distributed according to the same <<content-distribution>> rules
-			as for 'justify-content'.
-			The behavior of <<number>> values for 'justify-content' is analogous.
-
-			Note: The space allocated by ''align-content: 1tr'' will be zero
-			if 'justify-content' does not allocate space
-			between adjacent <a>alignment subjects</a>:
-			either due to not having a <<content-distribution>> value
-			or due to there being fewer than two <a>alignment subjects</a>.
-
-			If both 'align-content' and 'justify-content' have <<number>> values,
-			then 'justify-content'’s <<number>> value is ignored
-			and its <<content-distribution>> value honored as if specified alone.
-			If no <<content-distribution>> value was specified,
-			then 'justify-content' takes 'align-content'’s <<content-distribution>> value
-			(if one was specified)
-			and otherwise falls back to ''space-between''.
-	</dl>
-
-	<div class="example">
-		In this example,
-		a minimum of 1em is required between rows and columns.
-		Additionally, any extra space in the inline axis
-		that is distributed between columns,
-		with full-size spaces on either side of the outermost columns.
-		The gaps between rows are increased to match the extra space
-		distributed between adjacent columns,
-		but no space is added before the first row or after the last one.
-
-		<pre>
-			.grid {
-				grid-template-columns: repeat(auto-fill, 15em);
-				gap: 1em;
-				justify-content: space-evenly;
-				align-content: 1tr space-between;
-			}
-		</pre>
-
-		This next example is the same as the previous,
-		except that the ratio between row and column gaps is &phi;:
-
-		<pre>
-			.grid {
-				grid-template-columns: repeat(auto-fill, 15em);
-				gap: 1em 1.618em;
-				justify-content: space-evenly;
-				align-content: 0.618tr space-between;
-			}
-		</pre>
-	</div>
-
 <h2 id="changes">
 Changes</h2>
 
@@ -841,7 +756,7 @@ Changes</h2>
 
 	<ul>
 		<li>Defined [=resolved value=] of 'grid-template-rows' and 'grid-template-columns' for [=subgrids=].
-		<li>Renamed ''ar'' unit to ''tr''.
+		<li>Removed the aspect-ratio-controlled gutters feature (which will be moved to CSS Box Alignment Level 4 instead).
 	</ul>
 
 	<h3 class="no-num" id="changes-20180628">