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+++ b/testing/web-platform/tests/css/css-animations/animation-offscreen-to-onscreen.html
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+<!DOCTYPE html>
+<html class="reftest-wait">
+<title>Validates rendering of a transformed element when the element is initially off screen</title>
+<link rel="help" href="https://www.w3.org/TR/css-animations-1">
+<link rel="help" href="https://www.w3.org/TR/web-animations-1/#the-current-ready-promise">
+<link rel="match" href="animation-offscreen-to-onscreen-ref.html">
+<style type="text/css" media="screen">
+  body {
+    margin: 0;
+  }
+
+  @keyframes anim {
+    from { transform: translate(100px, 0px); }
+    to { transform: translate(100px, 0px); }
+  }
+
+  #box {
+    position: absolute;
+    left: 0px;
+    top: 100px;
+    height: 100px;
+    width: 100px;
+    margin: 0;
+    background-color: green;
+    transform: translate(-2000px, 0px);
+    animation-duration: 10s;
+    animation-direction: normal;
+    animation-timing-function: linear;
+    animation-name: anim;
+  }
+</style>
+<body>
+  <div id="box"></div>
+</body>
+<script src="/common/reftest-wait.js"></script>
+<script src="support/testcommon.js"></script>
+<script type="text/javascript">
+  window.onload = async () => {
+    await document.getAnimations()[0].ready;
+    await waitForNextFrame();
+    takeScreenshot();
+  }
+</script>
+</html>