WP: Search Form in Microdata Format

wp-searchform.php

<?php
/**
 * The search form in Microdata format.
 * 
 * This is used by Google to display a fully functional
 * search bar in the search results for your website,
 * directly below the title.
 * 
 * @link https://developers.google.com/webmasters/structured-data/slsb-overview
 */
?>
<div itemscope itemtype="http://schema.org/WebSite">
  <meta itemprop="url" content="<?php echo home_url('/'); ?>"/>
  <form class="search-form" method="get" action="<?php echo home_url('/'); ?>" role="search" itemprop="potentialAction" itemscope itemtype="http://schema.org/SearchAction">
    <meta itemprop="target" content="<?php echo home_url('/'); ?>?s={s}"/>
    <label class="search-form__label"><?php _e('Search'); ?></label>
    <input class="search-form__input" type="text" name="s" itemprop="query-input" required/>
    <input class="search-form__submit" type="submit"/>
  </form>
</div>