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Test Info:

<!DOCTYPE html>
<html>
<head>
<script>
function boom()
{
var table = document.getElementById("table");
var newCaption = document.createElement('caption');
newCaption.appendChild(document.createTextNode("THIS SHOULD BE VISIBLE"));
table.insertBefore(newCaption, table.firstChild);
}
</script>
</head>
<body onload="boom();">
<table id="table"><tbody></tbody></table>
</body>
</html>