remove duplicate values: slow, fast

after/syntax/css/css3-marquee.vim

@@ -1,4 +1,4 @@
 " TODO: create cssMarqueeProp group and cssMarqueeAttr group
 syn match cssFontProp contained "\<marquee-\(direction\|play-count\|speed\|style\)\>"
-syn keyword cssFontAttr contained forward reverse infinite slow fast slide alternate
+syn keyword cssFontAttr contained forward reverse infinite slide alternate
 syn match cssFontAttr contained "\<marquee-\(line\|block\)\>"

test/test.css

@@ -255,9 +255,7 @@
   marquee-direction: forward;
   marquee-play-count: reverse;
   marquee-speed: infinite;
-  marquee-style: slow;
-  display: fast;
-  display: slide;
+  marquee-style: slide;
   display: alternate;
   display: marquee-line;
   display: marquee-block;