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diff --git a/testing/web-platform/tests/css/css-anchor-position/anchor-scroll-overflow-hidden.html b/testing/web-platform/tests/css/css-anchor-position/anchor-scroll-overflow-hidden.html
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+++ b/testing/web-platform/tests/css/css-anchor-position/anchor-scroll-overflow-hidden.html
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+<!DOCTYPE html>
+<title>Basic of anchor positioned scrolling: anchored elements should be "pinned" to the anchor when anchor is scrolled in overflow:hidden</title>
+<link rel="help" href="https://drafts.csswg.org/css-anchor-1/">
+<link rel="match" href="anchor-scroll-overflow-hidden-ref.html">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+body {
+  font: 20px/1 Ahem;
+  margin: 0;
+}
+
+#scroll-container {
+  width: 400px;
+  height: 400px;
+  overflow: hidden;
+}
+
+#scroll-contents {
+  width: 1000px;
+  height: 1000px;
+}
+
+#placefiller-above-anchor {
+  height: 500px;
+}
+
+#placefiller-before-anchor {
+  display: inline-block;
+  width: 500px;
+}
+
+#anchor {
+  anchor-name: --anchor;
+}
+
+#inner-anchored {
+  color: green;
+  position: absolute;
+  left: anchor(--anchor left);
+  bottom: anchor(--anchor top);
+  position-anchor: --anchor;
+}
+
+#outer-anchored {
+  color: yellow;
+  position: absolute;
+  left: anchor(--anchor left);
+  top: anchor(--anchor bottom);
+  position-anchor: --anchor;
+}
+</style>
+
+<div id="scroll-container">
+  <div id="scroll-contents">
+    <div id="placefiller-above-anchor"></div>
+    <div id="placefiller-before-anchor"></div>
+    <span id="anchor">anchor</span>
+    <div id="inner-anchored">inner-anchored</div>
+  </div>
+</div>
+<div id="outer-anchored">outer-anchored</div>
+
+<script>
+const scroller = document.getElementById('scroll-container');
+scroller.scrollTop = 300;
+scroller.scrollLeft = 450;
+</script>