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<!DOCTYPE HTML>
<html>
<script>
function beforeunload(){
window.opener.postMessage({
info: "before-unload",
result: window.location.hash,
button: false,
}, "*");
}
window.onload = function (){
let button = window.document.getElementById("clickMeButton");
let buttonExist = button !== null;
window.opener.postMessage({
info: "onload",
result: window.location.href,
button: buttonExist,
}, "*");
button.click();
}
// after button clicked and paged scrolled sends URL of current window
window.onscroll = function(){
window.opener.postMessage({
info: "scrolled-to-foo",
result: window.location.hash,
button: true,
}, "*");
}
</script>
<body onbeforeunload="/*just to notify if we load a new page*/ beforeunload()";>
<div style="height: 1000px; border: 1px solid black;"> space</div>
<div style="height: 1000px; border: 1px solid black;">space</div>
</body>
</html>