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Test Info:

<!DOCTYPE html>
<html>
<head>
<script>
function boom()
{
var c = document.getElementById("c");
var space = document.createTextNode(" ");
c.parentNode.insertBefore(space, c);
}
</script>
</head>
<body style="font-family: monospace;" onload="boom();">
<div style="width: 3ch; border: 1px solid orange;">
<span>a</span> <span>b</span><span id="c">c</span>
</div>
</body>
</html>