mozilla-release/layout/reftests/css-display/display-contents-visibility-hidden.html

<!DOCTYPE html>
<!--
     Any copyright is dedicated to the Public Domain.
     http://creativecommons.org/publicdomain/zero/1.0/
-->
<html lang="en-US" class="reftest-wait">
<head>
  <meta charset="UTF-8">
  <title>CSS Test: CSS display:contents; visibility:hidden</title>
  <link rel="author" title="Mats Palmgren" href="https://bugzilla.mozilla.org/show_bug.cgi?id=907396">
  <link rel="help" href="http://dev.w3.org/csswg/css-display">
</head>
<body>
  <div id="x" style="display:contents; visibility: hidden">
    Line 1
  </div><script type="text/javascript">
    document.body.offsetWidth;
    document.getElementById("x").style.visibility = "visible";
    document.body.style.color = "green";
    document.body.offsetWidth;

    document.documentElement.className = '';
  </script>

</body>
</html>