template.php

<?php
// hook_html_head_alter()
function html5_boilerplate_html_head_alter(&$head_elements) {
  $head_elements['system_meta_content_type']['#attributes'] = array(
    'charset' => 'utf-8',
  );
}

// Preprocess variables for node.tpl.php.
function html5_boilerplate_preprocess_node(&$vars) {
  $vars['datetime'] = format_date($vars['created'], 'custom', 'c');
  if (variable_get('node_submitted_' . $vars['node']->type, TRUE)) {
    $vars['submitted'] = t('Submitted by !username on !datetime',
      array(
        '!username' => $vars['name'],
        '!datetime' => '<time datetime="' . $vars['datetime'] . '" pubdate="pubdate">' . $vars['date'] . '</time>',
      )
    );
  }
  else {
    $vars['submitted'] = '';
  }
  $vars['unpublished'] = '';
  if (!$vars['status']) {
    $vars['unpublished'] = '<div class="unpublished">' . t('Unpublished') . '</div>';
  }
}

// Preprocess variables for comment.tpl.php.
function html5_boilerplate_preprocess_comment(&$vars) {
  $uri = entity_uri('comment', $vars['comment']);
  $uri['options'] += array('attributes' => array('rel' => 'bookmark'));
  $vars['title'] = l($vars['comment']->subject, $uri['path'], $uri['options']);
  $vars['permalink'] = l(t('Permalink'), $uri['path'], $uri['options']);
  $vars['created'] = '<span class="date-time permalink">' . l($vars['created'], $uri['path'], $uri['options']) . '</span>';
  $vars['datetime'] = format_date($vars['comment']->created, 'custom', 'c');
  $vars['unpublished'] = '';
  if ($vars['status'] == 'comment-unpublished') {
    $vars['unpublished'] = '<div class="unpublished">' . t('Unpublished') . '</div>';
  }
}

// Preprocess variables for comment_wrapper.tpl.php
function html5_boilerplate_preprocess_comment_wrapper(&$vars) {
  if ($vars['node']->type == 'forum') {
    $vars['title_attributes_array']['class'][] = 'element-invisible';
  }
}

// Preprocess variables for block.tpl.php.
function html5_boilerplate_preprocess_block(&$vars) {
  if ($vars['block']->region == 'menu_bar') {
    $vars['title_attributes_array']['class'][] = 'element-invisible';
  }
  $nav_blocks = array('navigation', 'main-menu', 'management', 'user-menu');
  if (in_array($vars['block']->delta, $nav_blocks)) {
    $vars['theme_hook_suggestions'][] = 'block__menu';
  }
}

// Process variables for aggregator-item.tpl.php.
function html5_boilerplate_preprocess_aggregator_item(&$vars) {
  $item = $vars['item'];
  $vars['datetime'] = format_date($item->timestamp, 'custom', 'c');
}

// Changes the search form to use the "search" input element of HTML5
function html5_boilerplate_preprocess_search_block_form(&$vars) {
  $vars['search_form'] = str_replace('type="text"', 'type="search"', $vars['search_form']);
}

// Improve the accessibility of the advanced search form by wrapping everything in fieldsets
function html5_boilerplate_form_search_form_alter(&$form, $form_state) {
  if (isset($form['module']) && $form['module']['#value'] == 'node' && user_access('use advanced search')) {
    // Keywords
    $form['advanced'] = array(
      '#type' => 'fieldset',
      '#title' => t('Advanced search'),
      '#collapsible' => TRUE,
      '#collapsed' => TRUE,
      '#attributes' => array('class' => array('search-advanced')),
    );
    $form['advanced']['keywords-fieldset'] = array(
      '#type' => 'fieldset',
      '#title' => t('Keywords'),
      '#collapsible' => FALSE,
    );
    $form['advanced']['keywords-fieldset']['keywords'] = array(
      '#prefix' => '<div class="criterion">',
      '#suffix' => '</div>',
    );
    $form['advanced']['keywords-fieldset']['keywords']['or'] = array(
      '#type' => 'textfield',
      '#title' => t('Containing any of the words'),
      '#size' => 30,
      '#maxlength' => 255,
    );
    $form['advanced']['keywords-fieldset']['keywords']['phrase'] = array(
      '#type' => 'textfield',
      '#title' => t('Containing the phrase'),
      '#size' => 30,
      '#maxlength' => 255,
    );
    $form['advanced']['keywords-fieldset']['keywords']['negative'] = array(
      '#type' => 'textfield',
      '#title' => t('Containing none of the words'),
      '#size' => 30,
      '#maxlength' => 255,
    );
    // Node types
    $types = array_map('check_plain', node_type_get_names());
    $form['advanced']['types-fieldset'] = array(
      '#type' => 'fieldset',
      '#title' => t('Types'),
      '#collapsible' => FALSE,
    );
    $form['advanced']['types-fieldset']['type'] = array(
      '#type' => 'checkboxes',
      '#prefix' => '<div class="criterion">',
      '#suffix' => '</div>',
      '#options' => $types,
    );
    $form['advanced']['submit'] = array(
      '#type' => 'submit',
      '#value' => t('Advanced search'),
      '#prefix' => '<div class="action advanced-search-submit">',
      '#suffix' => '</div>',
      '#weight' => 99,
    );
    // Languages
    $language_options = array();
    foreach (language_list('language') as $key => $entity) {
      $language_options[$key] = $entity->name;
    }
    if (count($language_options) > 1) {
      $form['advanced']['lang-fieldset'] = array(
        '#type' => 'fieldset',
        '#title' => t('Languages'),
        '#collapsible' => FALSE,
        '#collapsed' => FALSE,
      );
      $form['advanced']['lang-fieldset']['language'] = array(
        '#type' => 'checkboxes',
        '#prefix' => '<div class="criterion">',
        '#suffix' => '</div>',
        '#options' => $language_options,
      );
    }
    $form['#validate'][] = 'node_search_validate';
  }
}