valid xhtml meta tags for facebook open-graph and twitter cards

Question

to make valid:

I've managed to get my code to come up valid everywhere...
save 1 error on http://validator.w3.org/

there is no attribute "property"

but only 1 instance among the many in the code, only the below seems to ruffle the validator's feathers:

I'd like the code to be completely valid in validator.w3.org's eyes. What am I missing?

Does it _need_ to be XHTML? If so, why aren't you serving the page with a real XHTML MIME type? — Mr Lister, Nov 13 '13 at 15:52
Good question. I should probably look into fixing the mime-type the server is serving. Thank you. — David, Nov 26 '13 at 22:01

score 0 · Answer 1 · edited May 23 '17 at 12:05

0

If you remove this element, the validator will complain about the next one containing the property attribute.

The property attribute is part of RDFa, but your DOCTYPE doesn’t allow the use of RDFa.

If you want to keep using XHTML 1.1, you could change it to:

for RDFa 1.0: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML+RDFa 1.0//EN" "http://www.w3.org/MarkUp/DTD/xhtml-rdfa-1.dtd">
for RDFa 1.1: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML+RDFa 1.1//EN" "http://www.w3.org/MarkUp/DTD/xhtml-rdfa-2.dtd">

edited May 23 '17 at 12:05

Community

answered Nov 14 '13 at 10:12

unor

Thank you so much, makes sense the doctype was the culprit. Much appreciated. – David Nov 26 '13 at 22:00

1 Answers1