W3C launches Nu Markup Validation Service

The W3C has announced the launch of the Nu Markup Validation Service. It says the non-DTD-based markup validator is offered in parallel to the existing DTD-based validator. "The W3C Nu Markup Validation Service uses the same backend as the Validator.nu site, which is also the backend for the HTML5-checking feature of validator.w3.org," said a W3C statement. "The Nu Markup Validation Service is a separate, standalone validator that provides that same HTML5-checking feature while also offering a user interface that exposes additional options, such as full validation support for XHTML5 documents, and the ability to validate documents that contain features from RDFa Core 1.1 and from RDFa Lite 1.1."

Web designer and author Emily Lewis tested the new service for us, using a simple test page. Her initial impressions were mixed. "It doesn't seem to validate RDFa Lite. I can completely remove the vocab attribute and value, and my page will still pass. Similarly, I can remove the typeof attribute and value, and still pass. It does, though, catch typos. So if I just had voca, it catches that as an error. However, the original W3C validator catches this too," she said, adding as a caveat that she doesn't use RDFa or RDFa Lite in her general work, and so the demo might have some issues. "However, with microdata, it does seem to catch those required attributes. For example, if I don't include itemscope, I get an error because that attribute is required. And regarding HTML5 validation, I only used the new semantic elements on my test page and it validates those just fine. But so does the original W3C validator!"

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