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Like the title says, I’m trying to determine if data is a standard attribute in the XHTML strict doctype. I can’t seem to find any information online (looks like its HTML-5ish).
If you’re talking about attributes with the
data-prefix, that’s indeed HTML5 only. If you want to use them in XHTML, you’d need XHTML5.There is also an attribute whose name is just
data. It’s for<object>elements and works like thesrcattribute on images. It’s part of HTML4 and XHTML1 in both Strict and Transitional doctypes.