code: public function getElementsByClassName(string $names):HTMLCollection {
  		$namesArray = explode(" ", $names);
  		$dots = "." . implode(".", $namesArray);
  
  		return $this->css($dots);
  	}
docs: Returns a live HTMLCollection containing all child elements which have all
  of the given class names. When called on the document object, the complete
  document is searched, including the root node.
  @param string $names a string representing the list of class names to
  match; class names are separated by whitespace
  @return HTMLCollection