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diff --git a/testing/web-platform/tests/css/css-scroll-anchoring/descend-into-container-with-overflow.html b/testing/web-platform/tests/css/css-scroll-anchoring/descend-into-container-with-overflow.html
new file mode 100644
index 0000000000..654f34a051
--- /dev/null
+++ b/testing/web-platform/tests/css/css-scroll-anchoring/descend-into-container-with-overflow.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style>
+
+body { height: 4000px; }
+#outer { width: 300px; }
+#zeroheight { height: 0px; }
+#changer { height: 100px; background-color: red; }
+#bottom { margin-top: 600px; }
+
+</style>
+<div id="outer">
+  <div id="zeroheight">
+    <div id="changer"></div>
+    <div id="bottom">bottom</div>
+  </div>
+</div>
+<script>
+
+// Tests that the anchor selection algorithm descends into zero-height
+// containers that have overflowing content.
+
+test(() => {
+  document.scrollingElement.scrollTop = 200;
+  document.querySelector("#changer").style.height = "200px";
+  assert_equals(document.scrollingElement.scrollTop, 300);
+}, "Zero-height container with visible overflow.");
+
+</script>