public function setHashtagButton($hashtag = null): void
	{
		$this->element->addClass('twitter-hashtag-button');

		// Build URL
		$url = new Url(self::TWITTER_TWEET_URL);
		$url->setQueryParameter('button_hashtag', $hashtag);
		$this->href = (string) $url;

		if ($hashtag) {
			$this->elementText = 'Tweet #' . $hashtag;
		}
	}