Customize the appearance of HTML5 input types when validation is unsuccessful

Hey everyone

I have a question: Is there a CSS trick to style the red border (or shadow) of input fields that have not been validated, such as email inputs?

If my explanation isn't clear enough, I'm referring to changing the color of this element:

Answer №1

Check out https://developer.mozilla.org/en/CSS/%3Ainvalid for more information specific to Firefox. It's likely that the details mentioned without "-moz" also apply to other browsers:

The :invalid CSS pseudo-class is automatically assigned to <input> elements when their contents do not validate based on the input type specified. This makes it easy for users to spot and correct errors in invalid fields.

In default settings, Gecko does not style the :invalid pseudo-class. However, it does add a styling feature (a red "glow" using the box-shadow property) to the :-moz-ui-invalid pseudo-class, which is applicable in certain cases involving :invalid.

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