By default magento WYSIWYG editor will strip certain tags from the editor. To allow your tags in WYSIWYG editor you must edit the file under the path
js/adminhtml/wysiwyg/tiny_mice/setup.js
1. Find var settings = { line and
2. Add extended_valid_elements : 'nav[style|id|class]'.
In my case i have allowed <nav> tag, and am allowing the attributes style, id etc. Now the nav tag wont be stripped when you add it in admin WYSIWYG editor.
js/adminhtml/wysiwyg/tiny_mice/setup.js
1. Find var settings = { line and
2. Add extended_valid_elements : 'nav[style|id|class]'.
In my case i have allowed <nav> tag, and am allowing the attributes style, id etc. Now the nav tag wont be stripped when you add it in admin WYSIWYG editor.