[css2] added 'fixed' value on 'position' property

--HG--
extra : convert_revision : svn%3A73dc7c4b-06e6-40f3-b4f7-9ed1dbc14bfc/trunk%40290

Author: howcom

css2/properties/properties.db

@@ -58,7 +58,7 @@
 /* clear;; none | left | right | both;; none;; *;; no;; N/A */
 
 /* direction;; ltr | rtl | ltr-override | rtl-override;; ltr;; all elements;; yes;; N/A*/
-/* position;; absolute | relative | static;; static;; *;; no;; N/A */
+/* position;; absolute | relative | fixed | static;; static;; *;; no;; N/A */
 /* top;; <length> | <percentage> | auto ;; auto;; *;; no;; N/A */
 /* bottom;; <length> | <percentage> | auto ;; auto;; *;; no;; N/A */
 /* left;; <length> | <percentage> | auto ;; auto;; *;; no;; N/A */