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Does anyone know how the HTML5 data attributes (data-*) can be implemented in XHTML without rendering the markup as invalid?
Is there a custom namespacing hack that would allow this on existing HTML elements?
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You can write HTML5 with XHTML 1.0 syntax, since HTML5 permits XML syntax and it explicitly allows an XHTML 1.0 doctype as “legacy doctype” in the XHTML syntax.
Adding a data attribute is easy. Any HTML element can have any number of data attributes added to its opening tag. We simply type data- followed by the name of our attribute into the element's opening tag alongside any other attributes we're already using.
HTML <data> Tag.
You could use XHTML5. Then your mark-up would be XML, and valid XHTML5.
I think you could also use XML namespacing to use them on XHTML1 — I’m not very familiar with XML, so I’m not sure.
I think that both of these methods technically require you to serve your pages as XML (instead of text/html), which Internet Explorer doesn’t support. But I suspect they’d work just fine in browsers even if you didn’t.
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