XHTML: Adding `custom` attributes

Question

Is it "ok" to add attributes to various tags to use in JavaScript DOM parsing?

For example if I want to have required fields in a form, would it be a bad practice if I would do this:

<input type="submit" name="name" required="true"/>

Thank you.

See [ Custom attributes - Yay or nay? ](stackoverflow.com/questions/992115/custom-attributes-yay-or-nay) and [ So what if custom HTML attributes aren't valid XHTML? ](stackoverflow.com/questions/994856/…). — Matthew Flaschen
– Matthew Flaschen, Commented Sep 17, 2010 at 23:10
Excellent, Matthew. Thanks. Either paste that as an answer for me to set it as the answer or someone delete my question. — Francisc
– Francisc, Commented Sep 18, 2010 at 0:17

Zerium · Accepted Answer · 2012-12-28 08:29:53Z

1

From that question:

HTML 5 explicitly allows custom attributes that begin with data. So, for example, <p data-date-changed="Jan 24 5:23 p.m.">Hello</p> is valid. Since it's officially supported by a standard, I think this is the best option for custom attributes. And it doesn't require you to overload other attributes with hacks, so your HTML can stay semantic.

Source: http://www.w3.org/TR/html5/elements.html#embedding-custom-non-visible-data-with-the-data-attributes

answered Dec 28, 2012 at 8:29

Zerium

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1 Comment

Francisc Over a year ago

Thanks. At that time I wasn't using HTML5. So the correct answer would be, "no, it is not valid XHTML".

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