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Editorial Team
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Asked: 2026-05-30T04:10:45+00:00

I use DOCTYPE XHTML 1 Transitional, I have a <a> with a custom attribute

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I use DOCTYPE XHTML 1 Transitional, I have a <a> with a custom attribute with name data-reveal-id, this attribute is used by a jQuery script.

I’m not able to validate the document using W3, as data-reveal-id is not XHTML valid.

Any idea how to solve it?

Many thanks for your help

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
...

   <a href="#" data-reveal-id="modal-portfolio-awards">View</a>

Error when validating with W3

there is no attribute "data-reveal-id" [XHTML 1.0 Transitional]
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1 Answer

  1. Editorial Team

    Option 1: Don’t use custom attributes

    Option 2: Use (X)HTML 5 (which allows custom attributes that start data-)

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