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Asked: 2026-06-05T08:19:50+00:00

I know that the value of identifiers can’t begin with numbers or hyphens, but

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I know that the value of identifiers can’t begin with numbers or hyphens, but can data attributes? And if so is there any reason for not using data--="" (not that I would, just curiosity speaking)

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  1. Editorial Team

    See the definition

    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).

    The reason is XML compability. And of course javascript compability because var 1234 is not possible.

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