<frameset cols="*">
<frame src="data:text/html,
<script>
function contextMenu()
{
document.getElementById('result').appendChild(document.createTextNode('PASS'));
}
</script>
<body onmousedown='return false;' oncontextmenu='contextMenu(); return false;'>
<p>
Control-click (Mac) or right-click (Windows) below. The word
%26ldquo;PASS%26rdquo; should appear. A contextual menu should not open.
</p>
<p id='result'></p>
</body>
">
</frameset>