[css-align-3] Define grid-gap as legacy name aliases w3c#8014

Author: fantasai

css-align-3/Overview.bs

@@ -2193,14 +2193,11 @@ Legacy Gap Properties: the 'grid-row-gap', 'grid-column-gap', and 'grid-gap' pro
 	The Grid Layout module was originally written with its own set of [=gutter=] properties,
 	before all such properties were unified into the existing 'row-gap'/'column-gap' naming.
 	For compatibility with legacy content,
-	those legacy property names must be supported as aliases:
+	these grid-prefixed names must be supported as follows:
 
-	* <dfn property>grid-row-gap</dfn> must be treated as a shorthand for the 'row-gap' property
-	* <dfn property>grid-column-gap</dfn> must be treated as a shorthand for the 'column-gap' property
-	* <dfn property>grid-gap</dfn> must be treated as a shorthand for the 'gap' property
-
-	In all three cases, the legacy properties must take the same grammar as the property they are aliasing,
-	and just "forward" the value to their aliased property.
+	* <dfn property>grid-row-gap</dfn> as a [=legacy name alias=] of the 'row-gap' property
+	* <dfn property>grid-column-gap</dfn> as a [=legacy name alias=] of the 'column-gap' property
+	* <dfn property>grid-gap</dfn> as a [=legacy name alias=] of the 'gap' property
 
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@@ -2529,6 +2526,8 @@ Changes</h2>
 			(<a href="https://github.com/w3c/csswg-drafts/issues/8214">Issue 8214</a>)
 		<li>Made [=block containers=] default to ''safe'' alignment.
 			(<a href="https://github.com/w3c/csswg-drafts/issues/8992">Issue 8992</a>)
+		<li>Define the 'grid-gap' properties as [=legacy name aliases=] of the 'gap' properties.
+			(<a href="https://github.com/w3c/csswg-drafts/issues/8014">Issue 8014</a>)
 	</ul>
 
 	Changes since the <a href="https://www.w3.org/TR/2021/WD-css-align-3-20211224/">24 December 2021 Working Draft</a> include: