I have an XHTML theme and it validates ok, but when I try to convert it to HTML5 I get quite a lot of errors like:
Attribute addthis:url is not serializable as XML 1.0.
Attribute addthis:url not allowed on element div at this point.
I read some posts about it, but they pretty much lean towards XHTML one way or another. Does that mean there is just simply no way to validate HTML5 with AddThis? (I am using "AddThis Social Bookmarking Widget Version 2.3.2")
Thank you in advance for any info.