I implemented author vcard in my wordpress single post fine with the following code:
<span class="vcard author"><span class="fn"> Written by: <Admin rel="author"><?php the_author() ?> </Admin> </span></span>
But when i check the web page with w3c validator it gives the error:
Element admin not allowed as child of element span in this context. (Suppressing further errors from this subtree.)
What should i change?