trait AllowedTagsXssTrait

trait AllowedTagsXssTrait {
    
    /**
     * Filters an HTML string to prevent XSS vulnerabilities.
     *
     * Like \Drupal\Component\Utility\Xss::filterAdmin(), but with a shorter list
     * of allowed tags.
     *
     * Used for items entered by administrators, like field descriptions, allowed
     * values, where some (mainly inline) mark-up may be desired (so
     * \Drupal\Component\Utility\Html::escape() is not acceptable).
     *
     * @param string $string
     *   The string with raw HTML in it.
     *
     * @return \Drupal\Core\Field\FieldFilteredMarkup
     *   An XSS safe version of $string, or an empty string if $string is not
     *   valid UTF-8.
     */
    public function fieldFilterXss($string) {
        @trigger_error(__METHOD__ . ' is deprecated in drupal:8.0.0 and is removed in drupal:9.0.0. Use \\Drupal\\Core\\Field\\FieldFilteredMarkup::create() instead.', E_USER_DEPRECATED);
        return FieldFilteredMarkup::create($string);
    }
    
    /**
     * Returns a list of tags allowed by AllowedTagsXssTrait::fieldFilterXss().
     */
    public function allowedTags() {
        @trigger_error(__METHOD__ . ' is deprecated in drupal:8.0.0 and is removed in drupal:9.0.0. Use \\Drupal\\Core\\Field\\FieldFilteredMarkup::allowedTags() instead.', E_USER_DEPRECATED);
        return FieldFilteredMarkup::allowedTags();
    }
    
    /**
     * Returns a human-readable list of allowed tags for display in help texts.
     */
    public function displayAllowedTags() {
        @trigger_error(__METHOD__ . ' is deprecated in drupal:8.0.0 and is removed in drupal:9.0.0. Use \\Drupal\\Core\\Field\\FieldFilteredMarkup::displayAllowedTags() instead.', E_USER_DEPRECATED);
        return FieldFilteredMarkup::displayAllowedTags();
    }

}