File: undo.html

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ckeditor 4.16.0%2Bdfsg-2
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<textarea id="editor">
	<p><img src="../../../_assets/lena.jpg"></p>
	<p>Foo</p>
	<p>Bar</p>
</textarea>

<p>Undo steps count: <span id="counter"></span></p>

<script>
	var counter = CKEDITOR.document.findOne( '#counter' ),
		editor = CKEDITOR.replace( 'editor', {
			height: 300,
			on: {
				instanceReady: function() {
					setInterval( function() {
						counter.setText( editor.undoManager.snapshots.length );
					}, 50 );
				}
			}
		} );
</script>