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<?php
/**
* Gravity Wiz // Disable HTML5 Validation on Gravity Forms
* http://gravitywiz.com/disable-html5-validation-on-gravity-forms/
*/
add_filter( 'gform_form_tag', 'add_no_validate_attribute_to_form_tag' );
function add_no_validate_attribute_to_form_tag( $form_tag ) {
    return str_replace( '>', ' novalidate="novalidate">', $form_tag );
}