id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
10340	DTD caching makes it impossible to modify DTD even before first editor creation	Piotrek Koszuliński		"{{{
CKEDITOR.dtd.customtag = { em:1 };
CKEDITOR.dtd.$block.customtag = 1;
CKEDITOR.dtd.body.customtag = 1;
}}}

Load:

{{{
<customtag>foo</customtag>
}}}

It will be transformed to:

{{{
<customtag></customtag>

<p>foo</p>
}}}

I think that we don't have to rewrite all code which caches DTD objects because that would ruin performance or increase complexity in some places. Therefore we can introduce event CKEDITOR#dtd fired when DTD is created and allowing its modifications.

Based on: http://stackoverflow.com/questions/16066556/ckeditor-how-to-allow-for-inserthtmlcustomtag-myattr-value-customtag

**EDIT: The problem is DTD caching makes it impossible to extend it after loading CKEditor source. **"	Bug	confirmed	Normal		General	4.0 Beta		Webkit Opera