diff --git a/after/syntax/css/fonts-4.vim b/after/syntax/css/fonts-4.vim
index 5eea722..07347ef 100644
--- a/after/syntax/css/fonts-4.vim
+++ b/after/syntax/css/fonts-4.vim
@@ -1,5 +1,5 @@
 syn keyword cssFontProp contained font-synthesis font-synthesis-weight font-synthesis-style font-synthesis-small-caps font-synthesis-position font-named-instance font-display ascent-override descent-override line-gap-override font-optical-sizing font-variation-settings font-palette font-variant-emoji font-presentation base-palette override-color
-syn keyword cssFontAttr contained emoji math fangsong swap fallback light dark contained system-ui contained ui-sans-serif ui-serif ui-monospace ui-rounded contained xxx-large contained historical-forms
+syn keyword cssFontAttr contained oblique-only emoji math fangsong swap fallback light dark contained system-ui contained ui-sans-serif ui-serif ui-monospace ui-rounded contained xxx-large contained historical-forms
 syn region cssFunction contained matchgroup=cssFunctionName start="\<\(stylistic\|styleset\|character-variant\|swash\|ornaments\|annotation\)\s*(" end=")" oneline keepend
 syn match cssFontDescriptor "@font-feature-values\>" nextgroup=cssFontDescriptorBlock skipwhite skipnl
 syn match cssFontDescriptor "@font-palette-values\>" nextgroup=cssFontDescriptorBlock skipwhite skipnl
diff --git a/test/test.css b/test/test.css
index 4d30116..9e3228f 100644
--- a/test/test.css
+++ b/test/test.css
@@ -539,6 +539,7 @@
   font-palette: auto;
   font-variant-emoji: auto;
   font-presentation: auto;
+  display: oblique-only;
   display: system-ui;
   display: emoji;
   display: math;