docs: public static Tag valueOf(String tagName, ParseSettings settings) {
          Validate.notNull(tagName);
          Tag tag = tags.get(tagName);
  
          if (tag == null) {
              tagName = settings.normalizeTag(tagName);
              Validate.notEmpty(tagName);
              tag = tags.get(tagName);
  
              if (tag == null) {
                  // not defined: create default; go anywhere, do anything! (incl be inside a <p>)
                  tag = new Tag(tagName);
                  tag.isBlock = false;
              }
          }
          return tag;
      }