Nu Html Checker says: ERROR Bad value shadowbox for attribute rel on element a: The string shadowbox is not a registered keyword. Changing 'getAttribute("rel")' in shadowbox.js to 'getAttribute("data-foobar")' may solve it.
Nu Html Checker says:
ERROR Bad value shadowbox for attribute rel on element a: The string shadowbox is not a registered keyword.
Changing 'getAttribute("rel")' in shadowbox.js to 'getAttribute("data-foobar")' may solve it.