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As soon as I define any valid_elements and/or extended_valid_elements I cannot insert iframe (iframe defined among valid_elements, extended_valid_elements)

All online samples with iframe support and valid_elements are with tinymce v3 and in v3 it works http://fiddle.tinymce.com/cTeaab/2

But in v4 it does not http://jsfiddle.net/armandsp/ug247bsm/

valid_elements : "a[href|target=_blank],strong,u,p,iframe[src|frameborder|style|scrolling|class|width|height|name|align]",
extended_valid_elements : "iframe[src|frameborder|style|scrolling|class|width|height|name|align]"
Armand P
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2 Answers2

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Its not an issue with valid_elements and/or extended_valid_elements its a syntax error. 

plugins: [
    "code",
    "media"
]

it should look like the following, plugins separated by spaces

plugins:"code autolink",

http://www.tinymce.com/wiki.php/Configuration:plugins

It doesn't support iframes if you enable media plugin

example : http://jsfiddle.net/ug247bsm/7/

Pavan Kumar Jorrigala
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    Thank you for the corrections. Strange that the media plugin (which by itself accepts iframes) does not accept iframe when valid_elements defined. My clients love the "insert video" option, but I guess I`ll have to make my own custom button. – Armand P Jul 21 '15 at 05:18
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That's the solution to the problem, nothing else is needed:

https://joomla.stackexchange.com/a/22257

I had a lot of trouble with this until I realised you have to select the correct TinyMCE panel set before editing the Prohibited elements. Choose the set that is assigned to administrator and editor.

Credits to the author!

colidyre
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Petar Veselinov Petrov
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