protected function renderHeadline($block) {
		$tag = 'h' . $block['level'];
		$text = $this->renderAbsy($block['content']);
		$slug = strtolower(Inflector::slug($text));

		return sprintf(
			'<%s><a id="%s" class="anchor" href="%s">%s</a></%s>' . "\n",
			$tag,
			$slug,
			'#' . $slug,
			$text,
			$tag
		);
	}