diff --git a/after/syntax/css/selectors-5.vim b/after/syntax/css/selectors-5.vim
new file mode 100644
index 0000000..24d70d2
--- /dev/null
+++ b/after/syntax/css/selectors-5.vim
@@ -0,0 +1,4 @@
+syn match cssSelectorOp "[||]"
+syn match cssSelectorOp "/[a-z:]\+/"
+syn keyword cssPseudoClassId contained defined local-link interest-source interest-target blank current past future heading
+syn region cssPseudoClassLang matchgroup=cssPseudoClassId start=":\(state\|headings\|nth-col\|nth-last-col\)(" end=")" oneline
diff --git a/test/test.css b/test/test.css
index 918064d..e5c599f 100644
--- a/test/test.css
+++ b/test/test.css
@@ -1149,6 +1149,23 @@ mask {
   display: auto;
 }
 
+.selectors-5:local-link,
+.selectors-5:interest-source,
+.selectors-5:interest-target,
+.selectors-5:blank,
+.selectors-5:current,
+.selectors-5:past,
+.selectors-5:future,
+.selectors-5:state(loading),
+.selectors-5:heading,
+.selectors-5:headings(1, 3, 5),
+.selectors-5 || .foo,
+.selectors-5:nth-col(1),
+.selectors-5:nth-last-col(1),
+.selectors-5 /for/ .foo {
+  display: auto;
+}
+
 .shadow-parts::part(textspan) {
   display: auto;
 }