[css-ui-4] Issue about user-select applying to ::before and ::after

Author: frivoal

css-ui-4/Overview.bs

@@ -424,6 +424,9 @@ Omitted values are set to their initial values.
 	User Agents must not apply the 'user-select' property to
 	the ''::first-line'' and ''::first-letter'' pseudo elements.
 
+	Issue: Whether 'user-select' should apply to ''::before'' and
+	''::after'' is an open question.
+
 	The computed value is the specified value,
 	except:
 	<ol>