[css-values-4] Mark open issue

Author: fantasai

css-values-4/Overview.bs

@@ -3,7 +3,7 @@ Title: CSS Values and Units Module Level 4
 Group: CSSWG
 Shortname: css-values
 Level: 4
-Status: WD
+Status: ED
 Work Status: Refining
 ED: https://drafts.csswg.org/css-values-4/
 TR: https://www.w3.org/TR/css-values-4/
@@ -962,6 +962,8 @@ Fragment URLs</h5>
 	This reference must always be treated as same-document
 	(rather than cross-document).
 
+	ISSUE(3320): This relative URL resolution behavior is under discussion.
+
 	Note: This means that such fragments will resolve
 	against the contents of the current document
 	(and in consideration of shadow DOM, only within the stylesheet's associated [=node tree=]),