docs: public CrawlElement click(String tagName) {
  		checkNotRead();
  		Preconditions.checkNotNull(tagName, "Tag name cannot be null");
  		CrawlElement crawlTag = new CrawlElement(EventType.click,
  				tagName.toUpperCase());
  		crawlElements.add(crawlTag);
  		return crawlTag;
  	}