Viewport metatag

Viewport metatag

/**
 * Implements hook_preprocess_htm().
 */
function HOOK_preprocess_html(&$variables) {
    $viewport = array(
        '#tag' => 'meta',
        '#attributes' => array(
            'name' => 'viewport',
            'content' => 'width=device-width, initial-scale=1, maximum-scale=1'));
    drupal_add_html_head($viewport, 'viewport');
}