Hi.

The following patch makes `css-mode' discriminate between
pseudo-classes and pseudo-ids. While it might not seem immediately
useful to do so, it will become useful when completion at point is
implemented in a later patch.


 From b87dadfbbacbd1372ba31e2f591a260e7b4b581f Mon Sep 17 00:00:00 2001
 From: =?UTF-8?q?Simen=20Heggest=C3=B8yl?= <simenheg@gmail.com>
Date: Sat, 14 Mar 2015 10:54:39 +0100
Subject: [PATCH 1/3] Discriminate between pseudo-classes and -elements

* textmodes/css-mode.el (css--font-lock-keywords): Discriminate
between pseudo-classes and pseudo-elements.
(css-pseudo-ids): Remove.
(css-pseudo-class-ids): New variable.
(css-pseudo-element-ids): New variable.
---
 lisp/ChangeLog             |  8 ++++++++
 lisp/textmodes/css-mode.el | 21 ++++++++++++++++-----
 2 files changed, 24 insertions(+), 5 deletions(-)

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index d393190..70122c7 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,11 @@
+2015-03-14  Simen Heggestøyl  <simenheg@gmail.com>
+
+	* textmodes/css-mode.el (css--font-lock-keywords): Discriminate
+	between pseudo-classes and pseudo-elements.
+	(css-pseudo-ids): Remove.
+	(css-pseudo-class-ids): New variable.
+	(css-pseudo-element-ids): New variable.
+
 2015-03-13  Kevin Ryde  <user42_kevin@yahoo.com.au>

 	info-look fixes for Texinfo 5
diff --git a/lisp/textmodes/css-mode.el b/lisp/textmodes/css-mode.el
index 44dc4df..dc11d44 100644
--- a/lisp/textmodes/css-mode.el
+++ b/lisp/textmodes/css-mode.el
@@ -120,10 +120,17 @@
 ;;    (media . "^ +\\* '\\([^ '\n]+\\)' media group")
 ;;    (property . "^ +\\* '\\([^ '\n]+\\)',")))

-(defconst css-pseudo-ids
-  '("active" "after" "before" "first" "first-child" "first-letter" 
"first-line"
-    "focus" "hover" "lang" "left" "link" "right" "visited")
-  "Identifiers for pseudo-elements and pseudo-classes.")
+(defconst css-pseudo-class-ids
+  '("active" "checked" "disabled" "empty" "enabled" "first"
+    "first-child" "first-of-type" "focus" "hover" "indeterminate" 
"lang"
+    "last-child" "last-of-type" "left" "link" "nth-child"
+    "nth-last-child" "nth-last-of-type" "nth-of-type" "only-child"
+    "only-of-type" "right" "root" "target" "visited")
+  "Identifiers for pseudo-classes.")
+
+(defconst css-pseudo-element-ids
+  '("after" "before" "first-letter" "first-line")
+  "Identifiers for pseudo-elements.")

 (defconst css-at-ids
   '("charset" "font-face" "import" "media" "page")
@@ -258,7 +265,11 @@
          (concat "\\(?:" scss--hash-re
                  "\\|[^@/:{} \t\n#]\\)"
                  "[^:{}#]*\\(?:" scss--hash-re "[^:{}#]*\\)*"))
-       "\\(?::" (regexp-opt css-pseudo-ids t)
+       ;; Even though pseudo-elements should be prefixed by ::, a
+       ;; single colon is accepted for backward compatibility.
+       "\\(?:\\(:" (regexp-opt (append css-pseudo-class-ids
+                                       css-pseudo-element-ids) t)
+       "\\|\\::" (regexp-opt css-pseudo-element-ids t) "\\)"
        "\\(?:([^\)]+)\\)?"
        (if (not sassy)
            "[^:{}\n]*"
-- 
2.1.4