HTML Attribute rel Errors using fancyBox

Question

I\'m using fancyBox to create a gallery with the following code:

Answer 1

You are getting the validation error because the rel attribute has a list of values that it is expecting (see http://www.w3schools.com/html5/att_a_rel.asp).

There is nothing you can do to fix this, Fancybox is using the attribute for a purpose for which is was not intended. There's nothing wrong with that. Web pages don't have to be 100% 'valid'.