In XHTML your page will receive warnings from w3c for using improper methods of adding characters such at “©.” The simple and logical way to add this into our code is by simply using the alt code ALT+1069 or copy and pasting it into our XHTML document. This however is incorrect. Instead you must input ©. This method is necessary for many characters including everday things like the quote sign.

For a list on how to add your characters validly check out Draac.com.