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<!DOCTYPE html>
<html lang="en">
<meta charset="utf-8">
<title>Reference: Perspective scrolling with nested clips</title>

<style>

html {
  padding: 50px 0 3000px;
}

body {
  margin: 0;
}

.scrollbox {
  width: 600px;
  height: 500px;
  perspective: 1px;
  overflow: auto;
}

.transformed {
  will-change: transform;
  width: 200px;
  height: 200px;
  margin: 200px 100px;
  border: 10px solid black;
}

.spacer {
  height: 4000px;
}

</style>

<div class="scrollbox">
  <div class="transformed"></div>
  <div class="spacer"></div>
</div>

<script>
document.documentElement.scrollTop = 250;
</script>