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I created a field with Radio buttons and when it fails to validate, there is no red highlight around it.

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There is only an error message at the top.

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How can I add a custom CSS class to any radio button fields upon a failed validation?

I am already altering this form with hook_form_alter(); and have a custom validation function, so I am willing to work on a custom module for this but just need some help being pointed in the right direction.

I would ideally like to add a ".error" class or something to this div and customize it in my CSS to also give it a red border.

How can this be acheived?

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Out of the box webforms created with Drupal core and the Webform module do not have in line error messaging and indicators for each form field.

You can either:

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