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Test Info:

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<script>
function boom()
{
var frame = document.getElementById("f");
var frameWin = frame.contentWindow;
frameWin.VTTCue;
document.body.removeChild(frame);
new frameWin.VTTCue(0, 1, "Bug 894104").getCueAsHTML();
}
</script>
</head>
<body onload="boom();"><iframe id="f" src="data:text/html,1"></iframe></body>
</html>