Drupal: Allow HTML in node title

 * This function generates the variables that are available in your node.tpl,
 * you should already have this in your template.php, but if not, create it.
function mytheme_preprocess_node(&$vars) {
    // It's important to run some kind of filter on the title so users can't
    // use fx script tags to inject js or do nasty things.
    $vars['title'] = filter_xss($vars['node']->title);

Source: http://goo.gl/mUBcPj

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