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Editorial Team
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Asked: 2026-05-18T04:26:15+00:00

I’ve got some java script code that implements a kind of slide show. It

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I’ve got some java script code that implements a kind of slide show. It uses a series of img tags as a table to control its actions. I probably used some code I found some where as a basis. Anyway, the img tags contain a data-img attribute which I can’t find in any definition of the img tag. Now I find I need to add more data to the img tags. So my questions are:

1) Is the data-img actually a real attribute or something adhoc?

2) Can I invent yet more attributes?

3) What is the danger of using such attributes?

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1 Answer

  1. Editorial Team

    1) It’s valid in HTML 5; it is an invalid attribute (that will, as far as I know, still work in all browsers, it but will break validation) in HTML 4

    2) As far as I am aware, you can add arbitrary attributes and query them in Javascript, but chances are those attributes will not survive certain DOM manipulation and other operations where the browser creates markup – it’s possible the invalid attributes will simply be dropped

    3) Your pages will no longer validate.

    Background: Custom attributes – Yay or nay?

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