Tinymce front-end: How to add css in head tag for iframe

[eddyprosperi]

Hy there!

I developed a custom template in Joomla 4.

Now when I use the tinymce fronted editor and open any modal the XTD buttons the modals don't load the css and javascript resources in the template.
https://ibb.co/FVvQ008
What I'm trying to do is put a css file in the head tag of the iframe inside the modal. I've been going crazy for several days with this problem I hope someone can help me.
I tried overriding in

• html/layouts/joomla/editors/buttons/modal.php
  html/layouts/libraries/html/bootstrap/modal/iframe.php

adding: add

Code: Select all

$doc    = JFactory::getDocument();
$doc->addStyleSheet(JURI::base( true ).'/templates/joomla-italia-theme/css/system-j4.min.css');

the file is inserted in the page header but not in the header of the iframe contained in the modal

In cassiopeia everything works correctly because the css and js files of the template are loaded both in the general head of the site and in the head tag of the iframe.

Can you help me or suggest?

[MarkRS]

Does using (the far superior, and still free) JCE help?

[eddyprosperi]

I have the same problem with any editor even with JCE