[css-grid-1] Define 'grid-template-areas' specified value to normalize whitespace and ..... tokens. #3261

Author: fantasai

css-grid-1/Overview.bs

@@ -2020,6 +2020,11 @@ Named Areas: the 'grid-template-areas' property</h3>
 		</pre>
 	</div>
 
+	Both the <a>specified value</a> and <a>computed value</a>
+	of a <<string>> value of 'grid-template-areas' serializes
+	each <a>null cell token</a> as a single "." (U+002E FULL STOP)
+	and each sequence of <a>whitespace</a> as a single space (U+0020 SPACE).
+
 <h4 id="implicit-named-lines">
 Implicit Named Lines</h4>