File: absolute-pos-box-inside-fixed-pos-box-with-changing-height.html

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<!DOCTYPE html>
<link rel="help" href="https://drafts.csswg.org/css-position/">
<link rel="match" href="absolute-pos-box-inside-fixed-pos-box-with-changing-height-ref.html">
<meta name="assert" content="bottom anchored abs pos child moves when fixed pos containing block height changes.">
<style>
body {
  margin: 0px;
}
#fixed {
  left: 0px;
  width: 100px;
  height: 200px;
  position: fixed;
}
.box {
  position: absolute;
  bottom: 0;
  width: 50px;
  height: 50px;
  background: green;
}
.ref {
  position: absolute;
  width: 50px;
  height: 50px;
  left: 0px;
  top: 250px;
  background: red;
}
</style>
<div class=ref></div>
<div style="position: absolute">
  <div id=fixed>
    <div class=box></div>
  </div>
</div>
<script>
  document.body.offsetTop;
  fixed.style.height = "300px";
</script>