Update inline-3.vim

https://www.w3.org/TR/2020/WD-css-inline-3-20200827/

Author: hail2u

after/syntax/css/inline-3.vim

@@ -4,5 +4,5 @@ syn match cssFontProp contained "\<text-edge\>"
 syn match cssFontProp contained "\<leading-trim\>"
 syn match cssFontProp contained "\<inline-sizing\>"
 syn match cssFontProp contained "\<initial-letter\(-\(align\|wrap\)\)\=\>"
-syn keyword cssFontAttr contained mathematical leading cap ex raise sink
+syn keyword cssFontAttr contained central mathematical leading cap ex drop raise
 syn match cssFontAttr contained "\<ideographic\(-ink\)\=\>"

test/test.css

@@ -458,13 +458,14 @@ template {
 	initial-letter-align: auto;
 	initial-letter-wrap: auto;
 	display: mathematical;
+	display: central;
 	display: ideographic;
 	display: leading;
 	display: cap;
 	display: ex;
 	display: ideographic-ink;
+	display: drop;
 	display: raise;
-	display: sink;
 }
 
 .layout-api-1 {