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chromium/third_party/blink/web_tests/fast/box-shadow/basic-shadows-2.html 

<!doctype html>
<html>
<head>
<style>
html {
    font: 10px Ahem;
    -webkit-font-smoothing: none;
}
</style>
</head>
<body>
  <div>Test for <a href="http://crbug.com/242624">issue 242624</a>: background-color on parent and child disables box-shadow.</div>
  <section style="background-color: #f0f0f0;box-shadow: 0 0 10px #000;">
    <div style="background-color: #fff;">
      This test should have a box shadow.
    </div>
  </section>
</body>
</html>