1 files changed, 30 insertions, 0 deletions
diff --git a/devtools/client/inspector/animation/test/doc_custom_playback_rate.html b/devtools/client/inspector/animation/test/doc_custom_playback_rate.html
new file mode 100644
index 0000000000..9adee99884
--- /dev/null
+++ b/devtools/client/inspector/animation/test/doc_custom_playback_rate.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8">
+    <style>
+    div {
+      background-color: lime;
+      height: 100px;
+    }
+    </style>
+  </head>
+  <body>
+    <script>
+    "use strict";
+
+    const duration = 100000;
+
+    function createAnimation(cls) {
+      const div = document.createElement("div");
+      div.classList.add(cls);
+      document.body.appendChild(div);
+      const animation = div.animate([{ opacity: 0 }], duration);
+      animation.playbackRate = 1.5;
+    }
+
+    createAnimation("div1");
+    createAnimation("div2");
+    </script>
+  </body>
+</html>