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Test Info:

<!DOCTYPE html>
<html>
<head>
<script type="text/javascript">
function doTest()
{
document.getSelection().selectAllChildren(document.body);
var editor = document.getElementById("editor");
editor.focus();
editor.selectionStart = 2;
editor.selectionEnd = 4;
editor.blur();
editor.focus();
}
</script>
</head>
<body onload="doTest()">
<p>normal text</p>
<textarea id="editor">textarea</textarea>
</body>
</html>