nl example

return $this;
    }

    public function document($dom)
    {
        $this->doctype();
        if ($dom->documentElement) {
            foreach ($dom->childNodes as $node) {
                $this->traverser->node($node);
            }
            $this->nl();
        }
    }

    protected function doctype()
    {
        $this->wr(static::DOCTYPE);
        $this->nl();
    }

    public function element($ele)
    {
        
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