Enable  tags in CKEditor?
This answer is for future reference

Checkout the WYSIWYG Filter


  The WYSIWYG Filter module provides an input filter that allows site
  administrators configure which HTML elements, attributes and style
  properties are allowed. It also may add rel="nofollow" to posted links
  based on filter options. It can do so with no additional parsing on
  user input. That is, it may apply nofollow rules while parsing HTML
  elements and attributes.
  
  The filter is based on whitelists that can be defined from the filter
  settings panel. Rules for HTML element and attributes are defined
  using the same syntax of the TinyMCE valid_elements option.
  
  HTML attributes related to DOM events (on*) are not allowed for
  security reasons (to prevent XSS, etc.).
  
  The following elements cannot be whitelisted due to security reasons,
  to prevent users from breaking site layout and/or to avoid posting
  invalid HTML. Forbidden elements: applet, area, base, basefont, body,
  button, embed, form, frame, frameset, head, html, iframe, input,
  isindex, label, link, map, meta, noframes, noscript, object, optgroup,
  option, param, script, select, style, textarea, title.


Please refer to the project page for more details.