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Test Info:

<!DOCTYPE HTML>
<html class="reftest-wait">
<head>
<script>
function doTest() {
var text = document.body.firstChild;
// Replace two lines with three lines (but not at line boundaries)
text.replaceData(34, 7, "5\nLine 6\nLine ");
document.documentElement.removeAttribute('class');
}
document.addEventListener("MozReftestInvalidate", doTest);
</script>
</head>
<body style="white-space:pre; padding: 2px; font-family: sans-serif;">
Line 1
Line 2
Line 3
Line 4
Line X
Line 7
Line 8
Line 9
</body>
</html>