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chromium/third_party/blink/web_tests/external/wpt/css/css-nesting/implicit-nesting-ident.html 

<!DOCTYPE html>
<title>CSS Nesting: Implicit nesting (ident)</title>
<link rel="help" href="https://drafts.csswg.org/css-nesting-1/">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
  #main {
    div {
      color: green;
    }
  }
</style>
<div id=main>
  <div id=target>
    Green
  </div>
</main>
<script>
  test(() => {
    assert_equals(getComputedStyle(target).color, 'rgb(0, 128, 0)');
  }, 'Nested rule starting with tag');
</script>