diff --git a/after/syntax/css/css-pseudo-4.vim b/after/syntax/css/css-pseudo-4.vim
new file mode 100644
index 0000000..2dfd755
--- /dev/null
+++ b/after/syntax/css/css-pseudo-4.vim
@@ -0,0 +1 @@
+syn match cssPseudoClassId contained "\<\(spelling\|grammer\)-error\>"
diff --git a/after/syntax/html.vim b/after/syntax/html.vim
index ab7566f..b2f5f9a 100644
--- a/after/syntax/html.vim
+++ b/after/syntax/html.vim
@@ -35,6 +35,7 @@ syn include @htmlCss syntax/css/css-line-grid-1.vim
 syn include @htmlCss syntax/css/css-lists-3.vim
 syn include @htmlCss syntax/css/css-masking-1.vim
 syn include @htmlCss syntax/css/css-overflow-3.vim
+syn include @htmlCss syntax/css/css-pseudo-4.vim
 syn include @htmlCss syntax/css/css-ruby-1.vim
 syn include @htmlCss syntax/css/css-scoping-1.vim
 syn include @htmlCss syntax/css/css-shapes-1.vim
diff --git a/test/test.css b/test/test.css
index 44c2c19..aa3f0f9 100644
--- a/test/test.css
+++ b/test/test.css
@@ -331,6 +331,13 @@
   presentation-level: increment;
 }
 
+.pseudo::selection,
+.pseudo::spelling-error,
+.pseudo::grammer-error,
+.pseuod::placeholder {
+  display: block;
+}
+
 .regions:region {
   flow-into: element;
   flow-from: content;
diff --git a/test/test.html b/test/test.html
index cd0b166..c200307 100644
--- a/test/test.html
+++ b/test/test.html
@@ -340,6 +340,13 @@
         presentation-level: increment;
       }
 
+      .pseudo::selection,
+      .pseudo::spelling-error,
+      .pseudo::grammer-error,
+      .pseuod::placeholder {
+        display: block;
+      }
+
       .regions:region {
         flow-into: element;
         flow-from: content;