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<!DOCTYPE html>
<meta charset="utf-8">
<style>
/* This lets us measure the height of the viewport
by measuring documentElement.offsetHeight. */
html { height: 100vh }
</style>
<script>
let mostRecentHeight = 0;
let heightChanges = 0;
function checkDocumentHeight() {
let curHeight = document.documentElement.offsetHeight;
if (curHeight != mostRecentHeight) {
mostRecentHeight = curHeight;
document.body.innerText = heightChanges++;
}
requestAnimationFrame(checkDocumentHeight);
}
</script>
<body onload="checkDocumentHeight();">
</body>
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