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chromium/third_party/blink/web_tests/external/wpt/css/css-contain/reference/contain-layout-020-ref.html 

<!DOCTYPE html>
<meta charset=utf-8>
<title>CSS Containment Test: Removing layout containment and contained positioned elements</title>

<style>
.container {
    width: 300px;
    height: 300px;
}
.box {
    width: 100px;
    height: 100px;
    background-color: green;
}
.fixed {
    position: fixed;
    top: 0;
    left: 0;
}
.abspos {
    position: absolute;
    top: 0;
    right: 0;
}
</style>

<div class="container">
  <div class="fixed box"></div>
  <div class="abspos box"></div>
</div>