Chuck Houpt, developer of the Validator SAC (standalone version of the W3C validation service) for MAC OSX, has kindly added the (X)HTML DTD’s I developed (hacked) to his application. This means that you can check your (X)HTML files containing ARIA attributes without them being flagged as errors. You can also check whether ARIA attributes and attribute values used are correct.
Download the Validator SAC for MAC OSX with Experimental WAI-ARIA Support
Checking a document with the experimental ARIA DTD’s using Validator SAC
On the validator inteface press the ‘More Options’ button.
Select a (X)HTML + ARIA DTD to check your document against from the ‘Document Type’ dropdown list. The ARIA DTD’s are located at the end of the dropdown list.
The (X)THML + ARIA validation is based on attributes and attribute values as defined in the WAI-ARIA (draft) specification 1.0 . The DTD’s are not official versions and have not been endorsed by anyone.
Validation of HTML 4.01 and XHTML 1.0 documents using the experimental DTD’s, will detect errors in WAI-ARIA attribute names and values only. The DTD’s allow ARIA attributes to be placed on any element. It will not provide any indication of the correctness of the use of a WAI-ARIA attribute on any given element.