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<?php $doc = new DOMDocument(); $doc->loadHTML('<p> asd asd '); echo $doc->validate();
Output for git.master, git.master_jit, rfc.property-hooks
Warning: DOMDocument::validate(): php_network_getaddresses: getaddrinfo for www.w3.org failed: System error in /in/DBSda on line 6 Warning: DOMDocument::validate(http://www.w3.org/TR/REC-html40/loose.dtd): Failed to open stream: php_network_getaddresses: getaddrinfo for www.w3.org failed: System error in /in/DBSda on line 6 Warning: DOMDocument::validate(): I/O warning : failed to load external entity "http://www.w3.org/TR/REC-html40/loose.dtd" in /in/DBSda on line 6 Warning: DOMDocument::validate(): Could not load the external subset "http://www.w3.org/TR/REC-html40/loose.dtd" in /in/DBSda on line 6

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