add css-variables.vim

after/syntax/css/css-variables.vim

@@ -0,0 +1,3 @@
+" TODO: create cssVariableProp group
+syn match cssFontProp contained "\<var-[A-Za-z_][A-Za-z0-9_-]\+\>"
+syn region cssFunction contained matchgroup=cssFunctionName start="\<var\s*(" end=")" oneline keepend

test/test.css

@@ -475,6 +475,10 @@
   display: initial;
 }
 
+.variables {
+  var-foo: var(foo);
+}
+
 .writing-modes {
   text-orientation: before;
   text-combine-horizontal: after;