HTML in Title field

html_in_title.features.filter.inc.php

<?php
/**
 * @file
 * html_in_title.features.filter.inc
 */

/**
 * Implements hook_filter_default_formats().
 */
function html_in_title_filter_default_formats() {
  $formats = array();

  // Exported format: Title field.
  $formats['title_field'] = array(
    'format' => 'title_field',
    'name' => 'Title field',
    'cache' => 1,
    'status' => 1,
    'weight' => 0,
    'filters' => array(
      'filter_html' => array(
        'weight' => -10,
        'status' => 1,
        'settings' => array(
          'allowed_html' => '<a> <b> <i> <em> <strong> <code> <span>',
          'filter_html_help' => 0,
          'filter_html_nofollow' => 0,
        ),
      ),
      'filter_htmlcorrector' => array(
        'weight' => 10,
        'status' => 1,
        'settings' => array(),
      ),
    ),
  );

  return $formats;
}

html_in_title.info

name = HTML in Title
description = Uses title module to allow html in title, with custom text format.
core = 7.x
version = 1.0
dependencies[] = title
features[features_api][] = api:2
features[filter][] = title_field

html_in_title.module.php

<?php
/**
 * @file
 * html_in_title.module
 */
 
/**
 * Implements of hook_element_info_alter().
 */
function html_in_title_element_info_alter(&$type) {
  // Our process callback must run immediately after filter_process_format().
  $filter_process_format_location = array_search('filter_process_format', $type['text_format']['#process']);
  $replacement = array('filter_process_format', 'html_in_title_filter_process_format');
  array_splice($type['text_format']['#process'], $filter_process_format_location, 1, $replacement);
}

/**
 * Process callback for form elements that have a text format selector attached.
 *
 * This callback runs after filter_process_format() and performs additional
 * modifications to the form element.
 *
 * @see filter_process_format()
 */
function html_in_title_filter_process_format($element) {

  // Note: this may interfere with Better Formats module!
  if (isset($element['#field_name']) && $element['#field_name'] == 'title_field') {

    // The title_field input format should be the *only* option avaible
    // to Title fields.
    $element['format']['format']['#default_value'] = 'title_field';
    $element['format']['format']['#options'] = array('title_field' => 'Title field');
    foreach(element_children($element['format']['guidelines']) as $format) {
      if ($format != 'title_field'){
        unset($element['format']['guidelines'][$format]);
      }
    }
    // Dont show formatting info, dont show help link.
    $element['format']['format']['#access'] = FALSE;
    $element['format']['help']['#access'] = FALSE;
  } else {
    // The title_field text format should be hidden for *any* field that
    // is NOT a title_field!
    unset($element['format']['format']['#options']['title_field']);
    unset($element['format']['guidelines']['title_field']);

    // The title_field text format should NOT be used for *any* field that
    // is NOT a title_field.
    if ($element['#format'] == 'title_field') {
      $other_formats = array_keys($element['format']['format']['#options']);
      $element['#format'] = array_shift($other_formats);
    }
  }
  return $element;
}