I have a contentEditable Div and I want remove any formatting especially for copy and paste text.
Have you tried using innerText?
ADDED:
If you want to strip markup from content pasted into the editable div, try the old hack of creating a temporary div -- see example below.
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Strip editable div markup</title>
<script type="text/javascript">
function strip(html) {
var tempDiv = document.createElement("DIV");
tempDiv.innerHTML = html;
return tempDiv.innerText;
}
</script>
</head>
<body>
<div id="editableDiv" contentEditable="true"></div>
<input type="button" value="press" onclick="alert(strip(document.getElementById('editableDiv').innerText));" />
</body>
</html>