File: fixed-pos-scrolled-clip-3-ref.html

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<!DOCTYPE html>
<html>

<title>Reference for: like fixed-pos-scrolled-clip-1.html, but inside a transform. This also tests that scrolling the root scroll frame moves the "fixed" layer which is only fixed with respect to the transform, not with respect to the viewport.</title>

<style>

body {
  margin: 0;
  height: 4000px;
}

.subframe {
  position: relative;
  left: 10px;
  top: 10px;
  width: 500px;
  height: 600px;
  overflow: auto;
  box-shadow: 0 0 0 2px black;
}

.scrolled {
  height: 4000px;
}

.greenSquare {
  position: absolute;
  top: 300px;
  left: 100px;
  width: 200px;
  height: 200px;
  background: lime;
}

</style>

<div class="subframe">
  <div class="scrolled">
    <div class="greenSquare"></div>
  </div>
</div>

<script>

document.documentElement.scrollTop = 20;
document.querySelector('.subframe').scrollTop = 200;

</script>