[css-display-3] Box parentage differes from element parentage in the case of anonymous boxes. #3259

Author: fantasai

css-display-3/Overview.bs

@@ -85,7 +85,7 @@ Introduction</h2>
 	<a>Boxes</a> are often referred to by their 'display' type--
 	e.g. a <a>box</a> generated by an element with ''display: block'' is called a “block box” or just a “block”.
 	The <dfn export for=CSS>parent box</dfn> of an element’s <a>principal box</a>
-	is (except in the case of ''run-in'')
+	is (except in the case of ''run-in'' or the generation of intervening <a>anonymous boxes</a>)
 	the <a>principal box</a> of its nearest ancestor element
 	that generates a <a>box</a>.