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chromium/third_party/blink/web_tests/external/wpt/css/CSS2/normal-flow/negative-margin-001-ref.html 

<!DOCTYPE html>
<style>
html, body {
  margin: 0;
}
html {
  margin-left: 10px;
}
outer {
  display: block;
  border: blue 10px solid;
  width: 100px;
}
inner {
  display: block;
  border: orange 10px solid;
  margin-left: -20px;
  margin-right: -50px;
  height: 10px;
}
</style>
<body>
  <outer>
    <inner></inner>
  </outer>
  <outer>
    <inner></inner>
  </outer>
  <outer>
    <inner></inner>
  </outer>
  <outer>
    <inner></inner>
  </outer>
</body>