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Asked: 2026-05-28T18:14:39+00:00

I was wondering if you can have a data-* attribute that is just data-

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I was wondering if you can have a data-* attribute that is just data-? or just data?

What are the rules here?

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  1. Editorial Team

    The data-* attribute rules are specified in the HTML5 specification.

    From the spec:

    A custom data attribute is an attribute in no namespace whose name starts with the string "data-", has at least one character after the hyphen, is XML-compatible, and contains no characters in the range U+0041 to U+005A (LATIN CAPITAL LETTER A to LATIN CAPITAL LETTER Z).

    Note that it also restricts the usage to lower case, however another note applies:

    All attributes on HTML elements in HTML documents get ASCII-lowercased automatically, so the restriction on ASCII uppercase letters doesn’t affect such documents

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