CODE EXAMPLE FOR PHP

how to change widget title tags in wordpress

//change sidebar parameters in child theme//

add_filter('dynamic_sidebar_params', 'twentytwentychild_edit_widget_func');

function twentytwentychild_edit_widget_func($params) {
    $params[0]['before_title'] =  '<h4 class="widget-title subheading heading-size-3">' ;
    $params[0]['after_title'] =  '</h4>' ;
    return $params;
}