<body>
<script>
if (window.layoutTestController)
    layoutTestController.dumpAsText();
        
document.designMode="on";

var e = document.body;
var s = window.getSelection();
s.setPosition(e, 0);

if (window.eventSender) {
    var mod = [];
    eventSender.keyDown('\t', mod);
}
</script>
try if tabs work in designMode<br>

</script>