Add CSS Display L3 to biblio.ref

Author: fantasai

biblio.ref

@@ -791,6 +791,14 @@
 %D 4 April 2013
 %U http://www.w3.org/TR/2013/CR-css3-conditional-20130404/
 
+%L CSS3-DISPLAY
+%T CSS Display Module Level 3
+%A Tab Atkins
+%S W3C Working Draft
+%O (Work in progress.)
+%D 20 February 2014
+%U http://www.w3.org/TR/2014/WD-css-display-3-20140220/
+
 %L CSS3-EXCLUSIONS
 %T CSS Exclusions Module Level 1
 %A Vincent Hardy