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<script>
'use strict';
document.documentElement.onclick = (e) => {
window.top.postMessage({ x: e.clientX, y: e.clientY, screenX: e.screenX, screenY: e.screenY }, "*");
};
window.onload = () => {
window.top.postMessage({ ready: true }, "*");
}
</script>
<style>
body {
margin: 0;
background: green;
}
</style>
<body></body>