<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Filter: Filtered block establishes a containing block.</title>
<link rel="author" title="Vladimir Levin" href="mailto:vmpstr@chromium.org">
<link rel="help" href="https://drafts.fxtf.org/filter-effects-1/#FilterProperty">
<link rel="match" href="filtered-block-is-container-ref.html">

<style>
#scroller {
  width: 500px;
  height: 500px;
  overflow: scroll
}
.spacer {
  width: 1000px;
  height: 500px;
  background-color: lightgreen;
}
#filter {
  /* no-op fil