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Changes between Initial Version and Version 1 of Ticket #14239, comment 3

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 I think there was a miscommunication here.
+Are you saying that it's ok to randomly duplicate tags in the case of broken markup? That is entirely inconsistent with the entire concept of ACF.
+I demonstrated that entering html5 (invalid or not, depends on the circumstances) will cause CKEditor to insert duplicate nodes. The editor is effectively unusable as a result. Since when does CKEditor take markup and make it worse?
 ACF as implemented results in the stripping of bad markup - not the duplication and recurrence of it.
+My example is just that, an example. If you play with HTML5 and custom ACF rules you are going to quickly see that there are other cases that are even worse. This is a very severe bug that prevents all but perfect HTML5 from being used with the editor.
 The tool is clearly broken. Closing this as invalid does not get us closer to a solution.
+The entire world is moving over to HTML5. Nobody wants to use an editor that breaks if there is a markup mistake...