code: protected HeadElement getHead() {
  		if (this.head == null) {
  			Element elt = Document.get().getElementsByTagName("head").getItem(0);
  			assert elt != null : "The host HTML page does not have a <head> element" + " which is required by this injector";
  			this.head = HeadElement.as(elt);
  		}
  		return this.head;
  	}
docs: Gets the head tag element.
  
  @return the head tag element