Update display-4.vim

https://www.w3.org/TR/2025/WD-css-display-4-20251106/

after/syntax/css/backgrounds-4.vim

@@ -1,2 +1,2 @@
-syn keyword cssFontProp contained background-position-x background-position-y background-position-inline background-position-block
+syn keyword cssFontProp contained background-repeat-x background-repeat-y background-repeat-inline background-repeat-block background-position-x background-position-y background-position-inline background-position-block background-tbd
-syn keyword cssFontAttr contained x-start x-end y-start y-end
+syn keyword cssFontAttr contained x-start x-end y-start y-end border-area text repeat-block repeat-inline

after/syntax/css/display-4.vim

@@ -1,2 +1,2 @@
-syn keyword cssFontProp contained reading-flow
+syn keyword cssFontProp contained reading-flow reading-order
-syn keyword cssFontAttr contained flex-visual flex-flow grid-rows grid-columns
+syn keyword cssFontAttr contained flex-visual flex-flow grid-rows grid-columns source-order force-hidden

test/test.css

@@ -85,14 +85,23 @@
 }
 
 .backgrounds-4 {
+  background-repeat-x: auto;
+  background-repeat-y: auto;
+  background-repeat-inline: auto;
+  background-repeat-block: auto;
   background-position-x: auto;
   background-position-y: auto;
   background-position-inline: auto;
   background-position-block: auto;
+  background-tbd: auto;
   display: x-start;
   display: x-end;
   display: y-start;
   display: y-end;
+  display: border-area;
+  display: text;
+  display: repeat-block;
+  display: repeat-inline;
 }
 
 .borders-4 {
@@ -388,10 +397,13 @@
 
 .display-4 {
   reading-flow: auto;
+  reading-order: auto;
   display: flex-visual;
   display: flex-flow;
   display: grid-rows;
   display: grid-columns;
+  display: source-order;
+  display: force-hidden;
 }
 
 .easing-1 {