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chromium/third_party/blink/web_tests/fast/dom/StyleSheet/css-medialist-item.html 

<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
<html>
<head>
<script src="../../../resources/js-test.js"></script>
</head>
<body>
<script>
description("This tests indexing outside the range of the media list object.");

var styleElement  = document.createElement('style');
styleElement.setAttribute('media', 'screen, print');
document.documentElement.appendChild(styleElement)
var mediaList = document.styleSheets[document.styleSheets.length - 1].media;

shouldEvaluateTo('mediaList.length', 2);
shouldBeEqualToString('mediaList[0]', 'screen');
shouldBeEqualToString('mediaList[1]', 'print');
shouldBeUndefined('mediaList[2]');
shouldBeUndefined('mediaList[-1]')

document.documentElement.removeChild(styleElement);
</script>
</body>
</html>