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chromium/third_party/blink/web_tests/external/wpt/css/css-nesting/supports-rule-ref.html 

<!DOCTYPE html>
<title>@supports with nesting</title>
<link rel="author" title="Matthieu Dubet" href="mailto:[email protected]">
<link rel="help" href="https://drafts.csswg.org/css-nesting-1/">
<style>
  .test {
    background-color: green;
    width: 100px;
    height: 100px;
    display: grid;
  }

  body * + * {
    margin-top: 8px;
  }
</style>
<body>
  <p>Tests pass if <strong>block is green</strong></p>
  <div class="test"></div>
  <div class="test"></div>
  <div class="test"></div>
  <div class="test"></div>
</body>