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Test Info:

<!DOCTYPE html>↩
<html class="reftest-wait">↩
<head>↩
<body style="white-space:pre"> FG ↩
JK ↩
<script>↩
document.body.offsetTop;↩
var t = document.body.firstChild;↩
var sel = window.getSelection();↩
sel.collapse(t, 1);↩
sel.extend(t, 3);↩
function doTest() {↩
t.insertData(0, ' BC \n');↩
document.documentElement.removeAttribute('class');↩
}↩
document.addEventListener("MozReftestInvalidate", doTest);↩
</script>↩
</body>↩
</html>↩