1 files changed, 29 insertions, 0 deletions
diff --git a/gfx/layers/apz/test/mochitest/helper_scroll_over_subframe_child.html b/gfx/layers/apz/test/mochitest/helper_scroll_over_subframe_child.html
new file mode 100644
index 0000000000..48f03a51d9
--- /dev/null
+++ b/gfx/layers/apz/test/mochitest/helper_scroll_over_subframe_child.html
@@ -0,0 +1,29 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<script src="/tests/SimpleTest/SimpleTest.js"></script>
+<script src="/tests/SimpleTest/paint_listener.js"></script>
+<script src="apz_test_utils.js"></script>
+<style>
+body {
+  margin: 0px;
+}
+
+#target {
+  width: 100%;
+  height: 100vh;
+  background: blue;
+  overflow: scroll;
+}
+</style>
+</head>
+<body>
+<div id="target">
+</div>
+</body>
+<script>
+  window.addEventListener("wheel", () => {
+    window.parent.postMessage("child-received-wheel-event", "*");
+  });
+</script>
+</html>