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Asked: 2026-05-11T02:14:00+00:00

Am I allowed to add whatever attributes I want to HTML tags such that

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Am I allowed to add whatever attributes I want to HTML tags such that I can retrieve their value later on using javascript? For example:

<a href='something.html' hastooltip='yes' tipcolour='yellow'>...</a>

If that’s not going to work, how would you store arbitrary pieces of information like this?

Edit: Since it appears that making up HTML attributes isn’t technically valid, I’ve rephrased the second part of this question into its own question here: How to store arbitrary data for some HTML tags

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1 Answer

  1. In HTML5, yes. You just have to prefix them with data-. See the spec.

    Of course, this implies you should be using the HTML5 doctype (<!doctype html>), even though browsers don’t care.

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