= array(
        'activity' => 'activity',
        'block' => 'block',
        'css_element' => 'css_element',
        'dialogue' => 'dialogue',
        'fieldset' => 'fieldset',
        'icon' => 'icon',
        'list_item' => 'list_item',
        'question' => 'question',
        'region' => 'region',
        'section' => 'section',
        'table' => 'table',
        'table_row' => 'table_row',
        'xpath_element' => 'xpath_element',
        'form_row' => 'form_row',
        'group_message_header' => 'group_message_header',
        'group_message' => 'group_message',
        'autocomplete' => 'autocomplete',
        'iframe' => 'iframe',
    )
 
Allowed types when using text selectors arguments.