How set joomla not to remove "rel" attribute

Question

I want to create an article with a link that has rel attribute, but Joomla is removing this attribute. How to make Joomla not to remove my attributes?

I have:

<a href = "http://site.com" rel="my_rel">

But at page a see:

<a href = "http://site.com">

I am using Joomla 2.5 and tinyMCE.

Answer 1

Solved by adding in tinymce.init() this:

extended_valid_elements: _old_settings_ + ",input[*]"

to enable all attributes for tag

Answer 2

I had a similar issue. I wanted to use the Font Awesome Icons which can e.g. be used with the <i> tag and a corresponding attribute.

Adding i[*] to the Valid Elements inside the plugin settings of TinyMCE solved the issue for me (Extensions -> Plugins > Editor - TinyMCE)

Note: It seems like, providing a value for the Valid Elements is overriding some default settings. Because I had to add ALL the tags I wanted to allow explicitly. E.g. i[*],span[*],br,h4,h3