code: public static String openTag(String tag, String clazz, String style, String... content) {
  		return openTag(tag, clazz, style, false, content);
  	}
docs: Build a String containing a HTML opening tag with given CSS class and/or style and concatenates the given
  content. 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 style style for tag (plain CSS)
  @param content content string
  @return HTML tag element as string