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function THEMENAME_preprocess_form_element(&$variables) { $variables['element']['#attributes']['class'] .= ' myclass'; kpr($variables); }With this code, the new class doesn't appear in the HTML, but it does appear in the KPR Message (when using Devel). I'd apperciate any ideas you can offer so I can make the class appear in the HTML.$attributesarray is actually initialised intheme_form_elementitself so in this case there's no way to override it without overriding the whole theme function I'm afraid