File: contain-layout-007.html

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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Containment Test: Layout containment fixed positioned descendants</title>
<link rel="author" title="Manuel Rego Casasnovas" href="mailto:rego@igalia.com">
<link rel="help" href="https://drafts.csswg.org/css-contain-1/#containment-layout">
<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
<meta name=assert content="Layout containment makes an element to act as containing block for fixed positioned descendants.">
<style>
#contain-layout {
  contain: layout;
  width: 100px;
  height: 100px;
  background: red;
}

#fixed {
  position: fixed;
  bottom: 0;
  right: 0;
  background: green;
  width: 100px;
  height: 100px;
}
</style>
<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<div id="contain-layout">
  <div id="fixed"></div>
</div>