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Editorial Team
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Asked: 2026-05-27T21:46:56+00:00

I recently came across a html email that contained _label attributes on the <

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I recently came across a html email that contained _label attributes on the < a > tags? I’ve never seen this before and have searched all over the web but can’t find out whether they are legit attributes.

The weird thing is in Internet Explorer they appear as a title attribute would (appearing on mouseover) but don’t in any other browser.

Example of use:

<a href="#" _label="this is the label">Click here</a>

Does anyone have any idea whether it’s something just Internet Explorer was going to introduce? Or someone at a big company has made a mistake?

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1 Answer

  1. Editorial Team

    I have never seen that used before. The a element does not have a _label or label attribute, so it’s invalid HTML.

    However, it is valid to start an attribute name with an underscore (assuming you’re using XML/XHTML), so perhaps it’s used by some script to produce the tooltip you mentioned. I don’t have IE to hand to check if it always happens.

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