css/css-contain/contain-size-scrollbars-004.html

<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Containment Test: Size containment scrollbars</title>
<link rel="author" title="Vladimir Levin" href="mailto:vmpstr@chromium.org">
<link rel="help" href="https://drafts.csswg.org/css-contain-1/#containment-size">
<link rel="match" href="reference/contain-size-scrollbars-004-ref.html">
<meta name=assert content="This test checks that contain:size element's content and padding are considered for scrollbars.">
<style>
#scroller {
  contain: size;
  background: lightgreen;
  overflow: scroll;
  padding-bottom: 50px;
  width: 100px;
  height: 100px;
}
#content {
  background: lightblue;
  width: 50px;
  height: 130px;
}
</style>

<div id=scroller>
  <div id=content>
  </div>
</div>

<p>This test passes if it has the same output as the reference.</p>