1 files changed, 36 insertions, 0 deletions
diff --git a/testing/web-platform/tests/css/css-scroll-anchoring/descend-into-container-with-float.html b/testing/web-platform/tests/css/css-scroll-anchoring/descend-into-container-with-float.html
new file mode 100644
index 0000000000..ff39608ff0
--- /dev/null
+++ b/testing/web-platform/tests/css/css-scroll-anchoring/descend-into-container-with-float.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style>
+
+body { height: 4000px; }
+#outer { width: 300px; }
+#outer:after { content: " "; clear:both; display: table; }
+#float {
+  float: left; background-color: #ccc;
+  height: 500px; width: 100%;
+}
+#inner { height: 100px; background-color: green; }
+
+</style>
+<div id="outer">
+  <div id="zeroheight">
+    <div id="float">
+       <div id="changer"></div>
+       <div id="inner"></div>
+    </div>
+  </div>
+</div>
+<div>after</div>
+<script>
+
+// Tests that we descend into zero-height containers that have floating content.
+
+test(() => {
+  document.scrollingElement.scrollTop = 50;
+  assert_equals(document.querySelector("#zeroheight").offsetHeight, 0);
+  document.querySelector("#changer").style.height = "50px";
+  assert_equals(document.scrollingElement.scrollTop, 100);
+}, "Zero-height container with float.");
+
+</script>