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<!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>