diff --git a/after/syntax/css/web-animations.vim b/after/syntax/css/web-animations.vim
new file mode 100644
index 0000000..dd72adc
--- /dev/null
+++ b/after/syntax/css/web-animations.vim
@@ -0,0 +1 @@
+" N/A
diff --git a/after/syntax/html.vim b/after/syntax/html.vim
index a25f3e5..f86286f 100644
--- a/after/syntax/html.vim
+++ b/after/syntax/html.vim
@@ -57,3 +57,4 @@ syn include @htmlCss syntax/css/html5-elements.vim
 syn include @htmlCss syntax/css/motion-1.vim
 syn include @htmlCss syntax/css/selectors-nonelement-1.vim
 syn include @htmlCss syntax/css/selectors4.vim
+syn include @htmlCss syntax/css/web-animations.vim
diff --git a/test/test.css b/test/test.css
index 92f61a0..f0a3207 100644
--- a/test/test.css
+++ b/test/test.css
@@ -670,6 +670,10 @@
   user-zoom: auto;
 }
 
+.web-animations {
+  display: auto;
+}
+
 .will-change {
   will-change: scroll-position;
 }
diff --git a/test/test.html b/test/test.html
index ae03df5..e2741c1 100644
--- a/test/test.html
+++ b/test/test.html
@@ -736,6 +736,11 @@
 }
 </style>
 <style>
+.web-animations {
+  display: auto;
+}
+</style>
+<style>
 .will-change {
   will-change: scroll-position;
 }