diff --git a/after/syntax/css/contain-3.vim b/after/syntax/css/contain-3.vim
new file mode 100644
index 0000000..e69de29
diff --git a/test/test.css b/test/test.css
index 7f546e1..0c5b4f2 100644
--- a/test/test.css
+++ b/test/test.css
@@ -155,6 +155,10 @@
 	content-visibility: auto;
 }
 
+.contain-3 {
+	display: auto;
+}
+
 .content-3 {
 	string-set: auto;
 	bookmark-level: auto;