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diff --git a/testing/web-platform/tests/scroll-animations/css/scroll-timeline-default-quirks-mode.html b/testing/web-platform/tests/scroll-animations/css/scroll-timeline-default-quirks-mode.html
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+++ b/testing/web-platform/tests/scroll-animations/css/scroll-timeline-default-quirks-mode.html
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+<html class="reftest-wait">
+<title>The default scroll() timeline in quirks mode</title>
+<link rel="help" href="https://drafts.csswg.org/scroll-animations-1/#scroll-notation">
+<link rel="help" href="https://drafts.csswg.org/css-animations-2/#animation-timeline">
+<meta name="assert" content="CSS animation correctly updates values when using the default scroll() timeline">
+<link rel="match" href="scroll-timeline-default-ref.html">
+
+<style>
+  @keyframes update {
+    from { transform: translateY(0px); }
+    to { transform: translateY(200px); }
+  }
+
+  html {
+    min-height: 100%;
+    padding-bottom: 100px;
+  }
+
+  #box {
+    width: 100px;
+    height: 100px;
+    background-color: green;
+    animation: update 1s linear;
+    animation-timeline: scroll();
+  }
+
+  #covered {
+    width: 100px;
+    height: 100px;
+    background-color: red;
+  }
+
+  * {
+    margin-top: 0px;
+    margin-bottom: 0px;
+  }
+</style>
+
+<div id="box"></div>
+<div id="covered"></div>
+<script src="/web-animations/testcommon.js"></script>
+<script>
+document.documentElement.addEventListener('TestRendered', async () => {
+  runTest();
+}, { once: true });
+
+async function runTest() {
+  const scroller = document.scrollingElement;
+
+  await waitForCompositorReady();
+
+  // Move the scroller to the halfway point. Then advance to the next frame
+  // to pick up the new timeline time.
+  const maxScroll = scroller.scrollHeight - scroller.clientHeight;
+  scroller.scrollTop = 0.5 * maxScroll;
+
+  await waitForNextFrame();
+  await waitForNextFrame();
+
+  document.documentElement.classList.remove("reftest-wait");
+}
+
+</script>