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<!DOCTYPE html>
<meta charset="utf-8">
<style>
body {
margin: 0;
padding-top: 1000px;
}
#target {
height: 100px;
width: 100px;
background: green;
}
</style>
<div id="target"></div>
<script>
target.scrollIntoView({block: "center"});
addEventListener("message", event => {
if (event.data === "scrollY") {
event.source.postMessage(scrollY, "*");
}
});
</script>