code: public static String openTagClassHtmlContent(String tag, String clazz, String... content) {
  		return openTagHtmlContent(tag, clazz, null, content);
  	}
docs: Build a String containing a HTML opening tag with given CSS class and concatenates the given HTML content.
  
  @param tag String name of HTML tag
  @param clazz CSS class of the tag
  @param content content string
  @return HTML tag element as string