code: public static String tagClass(String tag, String clazz, String... content) {
  		return openTagClass(tag, clazz, content) + closeTag(tag);
  	}
docs: Build a String containing a HTML opening tag with given CSS class, content and closing tag.
  Content should contain no HTML, because it is prepared with {@link #htmlEncode(String)}.
  
  @param tag String name of HTML tag
  @param clazz CSS class of the tag
  @param content content string
  @return HTML tag element as string