File: contain-layout-stacking-context-001.html

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<!DOCTYPE HTML>
<title>'contain: layout' establishes stacking context.</title>
<link rel="author" title="Psychpsyo" href="mailto:psychpsyo@gmail.com">
<link rel="help" href="https://drafts.csswg.org/css2/visuren.html#x43">
<link rel="help" href="https://drafts.csswg.org/css-contain/#containment-layout">
<link rel="match" href="contain-paint-stacking-context-001-ref.html">
<style>
  div {
    width: 100px;
    height: 100px;
  }
  #front {
    background-color: green;
    /* makes a stacking context and puts this on top */
    position: absolute;
    z-index: 10;
  }
  #back {
    contain: layout;
  }
  #notOnTop {
    background-color: red;
    /* z-index is higher than on #front, but this should still be covered up because it is inside #back, which has 'contain: layout' */
    position: absolute;
    z-index: 1000;
  }
</style>
<div id="front"></div>
<div id="back">
  <div id="notOnTop"></div>
</div>
Test succeeds if there is no red.