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<?php function fn(string $content): string { $dom = new DOMDocument(); $dom->loadHTML($content, LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD); return $dom->saveHTML($dom->documentElement); } echo fn("<table><h1>Je Suis Une Pizza</h1></table>"); echo "\n"; echo fn("<table>\n<h1>Je Suis Une Pizza</h1></table>"); echo "\n";