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chromium/third_party/blink/web_tests/external/wpt/css/css-cascade/scope-shadow-sharing-ref.html 

<!DOCTYPE html>
<title>@scope - Shadow DOM with shared style data</title>
<style>
div {
  padding: 3px;
  border: 1px solid;
  background: red;
}

.blue {
  background: blue;
}

.green {
  background: green;
}
</style>
<div><div class="blue"></div></div>
<div><div class="green"></div></div>
<div><div class="blue"></div></div>
<div><div class="green"></div></div>