chromium/third_party/blink/web_tests/external/wpt/css/printing/emoji-print.html

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>test that emoji are not blank in print output</title>
  <meta name="assert" content="emoji characters should be visible when printed">
  <link rel=help href="https://bugzilla.mozilla.org/show_bug.cgi?id=1723787">
  <link rel="mismatch" href="/css/reference/blank.html">
</head>
<body>
  <p>
    <span>&#x1f600;&#x1f601;&#x1f602;&#x1f603;</span>
  </p>
</body>
</html>