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diff --git a/layout/reftests/css-animations/mask-position-after-finish-1a.html b/layout/reftests/css-animations/mask-position-after-finish-1a.html
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index 0000000000..c777e028a3
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+++ b/layout/reftests/css-animations/mask-position-after-finish-1a.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+<title>mask-position animation after finish</title>
+<style>
+  @keyframes changeMaskPosition {
+    from { mask-position: 0% 0%; }
+    to { mask-position: center center; }
+  }
+  #test {
+    height: 100px;
+    width: 100px;
+    background-color: blue;
+    mask-repeat: no-repeat;
+    mask-position: 0% 0%;
+    mask-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="25" height="25"><rect x="0" y="0" width="25" height="25" fill="blue"/></svg>');
+    animation: changeMaskPosition 0.01s forwards;
+  }
+</style>
+<div id="test"></div>
+<script>
+document.getElementById("test").addEventListener("animationend", () => {
+  requestAnimationFrame(() => {
+    document.documentElement.classList.remove("reftest-wait");
+  })
+});
+</script>