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<?php $x = '<?xml version="1.0" encoding="utf-8"><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd"><div> </div> <div> <h1>headline</h1> </div>'; $doc = new DOMDocument('1.0', 'UTF-8'); $doc->preserveWhiteSpace = false; $doc->formatOutput = false; $doc->loadHTML($x); print $doc->saveHtml();
Output for git.master, git.master_jit, rfc.property-hooks
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd"> <?xml version="1.0" encoding="utf-8"><html><body><div> </div> <div> <h1>headline</h1> </div></body></html>

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