chromium/third_party/blink/web_tests/fast/css/color-leakage.html

<html>
  <head>
  <!-- The Ahem font rendered in this test should be displayed black, not blue. -->
    <style>
      @font-face {
        font-family: 'Ahem';
        src: url('resources/Ahem.ttf');
      }
      div {
        display: block;
        font-family: Ahem;
        font-size: 30px;
        color: black;
        border-top: 5px solid blue;
        border-bottom: 5px solid rgba(0,0,0,0.9);
        width: 650px;
      }
    </style>
</head>
<body>
  <div>
    This should be black.
  </div>
</body>
</html>