drhowarddrfine - 4:21 am on Dec 15, 2013 (gmt 0)
I should have checked to see the article was written four years ago but they typically re-address topics.
And, specifically, it's stated you can't.
But I was able to make an interpretation, specifically that you are probably allowed to put almost any kind of contact information inside the <address> element
The validator checks tags and not content so you can have invalid content but still validate.
I'm going to adopt the position that anything which validates must be within the rules.
I don't recall if that part of the spec has changed since that article was written but here's the web developer's edition: [developers.whatwg.org...]
The address element represents the contact information for its nearest article or body element ancestor. If that is the body element, then the contact information applies to the document as a whole.
The address element must not be used to represent arbitrary addresses (e.g. postal addresses), unless those addresses are in fact the relevant contact information. (The p element is the appropriate element for marking up postal addresses in general.)
The address element must not contain information other than contact information.