File: isolation-establishes-stacking-context.html

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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Compositing and Blending: The isolation property</title>
<link rel="author" title="Oriol Brufau" href="mailto:obrufau@igalia.com">
<link rel="help" href="https://www.w3.org/TR/compositing-1/#isolation">
<link rel="match" href="../../reference/ref-filled-green-100px-square.xht">
<meta name="assert" content="For CSS, setting `isolation` to `isolate` will turn the element into a stacking context.">

<style>
#parent {
  width: 100px;
  height: 100px;
  isolation: isolate;
  background: red;
}
#child {
  width: 100px;
  height: 100px;
  position: relative;
  z-index: -1;
  background: green;
}
</style>

<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<div id="parent">
  <div id="child"></div>
</div>