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.

[Jakub Ś]

Problem can be reproduced in Webkit and Opera from CKEditor 4.0 beta.

To reproduce I have:

1. In replacebycode.html sample pasted below code before the replace method

   CKEDITOR.config.allowedContent  = true; //Only in 4.1
   CKEDITOR.dtd.customtag = { em:1 };
   CKEDITOR.dtd.$block.customtag = 1;
   CKEDITOR.dtd.body.customtag = 1;
   

2. Next I have emptied editor contents with New Page command and pasted in source mode this tag

   <customtag>foo</customtag>
   

Results:

• In CKEditor 3.x branch tag is left untouched in all browsers.
• In CKEditor 4.0 beta "foo" stays in customtag but it gets wrapped into paragraph and new paragraphs are inserted on every mode switch.
• In CKEditor 4.0 and above in Webkit and Opera result is

  <customtag></customtag>
  
  <p>foo</p>
  

[Jakub Ś]

Seems other browsers are affected too.

In IE and FF if you paste <customtag>foo</customtag> switch to source and back it works as expected but if in wysiwyg mode you click on a tag and then switch to source result will be:

<customtag></customtag>

<p>foo</p>

[Jakub Ś]

#14717 was marked as duplicate.

We need to make sure that tags with namespaces like: <cnn:news> will also be accepted by the editor.

[Piotrek Koszuliński]

This is not a duplicate. This issue is about making it simpler to change DTD in specific case. The DTD is always configurable and can be tuned up to accept tags like cnn:news.

[Jakub Ś]

I have reopened the #14717

[Jakub Ś]

Related issues: #11562, #14717, #14615.

Please aslo see ​this comment