How to saveHTML of DOMDocument without HTML wrapper?

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All of these answers are now wrong, because as of PHP 5.4 and Libxml 2.6 loadHTML now has a $option parameter which instructs Libxml about how it should parse the content.

Therefore, if we load the HTML with these options

$html->loadHTML($content, LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD);

when doing saveHTML() there will be no doctype, no <html>, and no <body>.

LIBXML_HTML_NOIMPLIED turns off the automatic adding of implied html/body elements
LIBXML_HTML_NODEFDTD prevents a default doctype being added when one is not found.

Full documentation about Libxml parameters is here

(Note that loadHTML docs say that Libxml 2.6 is needed, but LIBXML_HTML_NODEFDTD is only available in Libxml 2.7.8 and LIBXML_HTML_NOIMPLIED is available in Libxml 2.7.7)

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