WordPress Widgets by default have titles as h2 tag. if you need to change them to something else it is easy to change ti with WordPress filter.
<?php
function change_widget_title($title, $instance, $id_base) {
$title = '<h4 class="widget-title widgettitle">'.preg_replace('/[^A-Za-z0-9\-]/', '', strip_tags($title)).'</h4>';
return $title;
}
add_filter('widget_title' , 'change_widget_title', 10, 3); //we use the default priority
?>
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Trigger Location: Everywhere
Script Location: PHP