+ /**
+ * Return the HTML for a message box.
+ * @since 1.31
+ * @param string $html of contents of box
+ * @param string $className corresponding to box
+ * @param string $heading (optional)
+ * @return string of HTML representing a box.
+ */
+ private static function messageBox( $html, $className, $heading = '' ) {
+ if ( $heading ) {
+ $html = self::element( 'h2', [], $heading ) . $html;
+ }
+ return self::rawElement( 'div', [ 'class' => $className ], $html );
+ }
+
+ /**
+ * Return a warning box.
+ * @since 1.31
+ * @param string $html of contents of box
+ * @return string of HTML representing a warning box.
+ */
+ public static function warningBox( $html ) {
+ return self::messageBox( $html, 'warningbox' );
+ }
+
+ /**
+ * Return an error box.
+ * @since 1.31
+ * @param string $html of contents of error box
+ * @param string $heading (optional)
+ * @return string of HTML representing an error box.
+ */
+ public static function errorBox( $html, $heading = '' ) {
+ return self::messageBox( $html, 'errorbox', $heading );
+ }
+
+ /**
+ * Return a success box.
+ * @since 1.31
+ * @param string $html of contents of box
+ * @return string of HTML representing a success box.
+ */
+ public static function successBox( $html ) {
+ return self::messageBox( $html, 'successbox' );
+ }
+