Client-side image maps without a "name" attribute failed in XHTML+RDFa

According the DTD of XHTML Client-side Image Map Module loaded by the XHTML+RDFa DTD, an element map should not have to name attribute.

Currently, WebKit ignores the map in the absence of the attribute "name".

Demo

Beach Scene A deck chair Parasol

Current browser support

Expected result

See the same test, but with a valid XHTML Transitional version of map element with a name attribute.