Update values-4.vim

https://www.w3.org/TR/2021/WD-css-values-4-20210930/

Author: hail2u

after/syntax/css/values-4.vim

@@ -1,3 +1,3 @@
 syn match cssValueLength contained "[-+]\=\d\+\(\.\d*\)\=\(ic\|cap\|lh\|rlh\)"
 syn match cssValueLength contained "[-+]\=\d\+\(\.\d*\)\=\(s\|l\|d\)\=v\(h\|w\|i\|b\|min\|max\)"
-syn region cssFunction contained matchgroup=cssFunctionName start="\<\(min\|max\|clamp\|toggle\|round\|mod\|rem\|a\=\(sin\|cos\|tan\)\|atan2\|pow\|sqrt\|hypot\|log\|exp\|abs\|sign\)\s*(" end=")" oneline keepend
+syn region cssFunction contained matchgroup=cssFunctionName start="\<\(mix\|min\|max\|clamp\|toggle\|round\|mod\|rem\|a\=\(sin\|cos\|tan\)\|atan2\|pow\|sqrt\|hypot\|log\|exp\|abs\|sign\)\s*(" end=")" oneline keepend

test/test.css

@@ -1217,6 +1217,7 @@ view {
 	display: exp(1);
 	display: abs(-1);
 	display: sign(-4);
+	display: mix(33%; 1px; 2px);
 }
 
 .variables-1 {