Tab design issue

Completely disabled the input filtering and the above behavior in my test wasn't from CB, but from TinyMCE reformatting it. Are you sure it's not the WYSIWYG editor applying this? Will retest without an editor and see if CB could still be causing issues here.

Ok, confirmed the bug with Editor set to None. Wasn't noticeable due to TinyMCE correcting empty attribute automatically. I'm guessing you're using JCE, which isn't doing this?

Have retested using Joomla's filters and it doesn't break the attribute, but it will remove it as Joomla's filter does not like empty attributes either. So regardless it seams you'll need to provide an attribute with a value.

Ok I'll send the message to JCE team to see if they can adapt their soft

Ryan was aware of this and here is his answer 

 In a recent update, JCE changed the way boolean elements (controls, autoplay etc.) were rendered in elements, using the HTML5 standard of not including the value, eg:<video src=" www.joomlacontenteditor.net/video.mp4 " controls autoplay>Unfortunately, the Joomla Text Filter removes these attributes unless they are the last in the attributes order. Although JCE re-ordered them so they would be last, it appears that in some instances the Joomla Text Filter still removes them on saving.This does not happen if the Joomla Text Filter is set to No Filtering for the user group (this should only be set to No Filtering for the Super User group).JCE Pro 2.9.77 reverts the use of the HTML 5 boolean attribute, using controls="controls" etc. for these values.You can test JCE Pro 2.9.77 RC -  www.joomlacontenteditor.net/downloads/editor/pro/development I hope to release JCE Pro 2.9.77 tomorrow, or early next week.