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<?php $test = <<<EOT <!DOCTYPE html> <html> <body> <audio src="foo.ogg"> <track kind="captions" src="foo.en.vtt" srclang="en" label="English"> <track kind="captions" src="foo.sv.vtt" srclang="sv" label="Svenska"> </audio> </body> </html> EOT; $dom = new DOMDocument(); $dom->loadHTML($test); print $dom->saveHTML();
Output for git.master, git.master_jit, rfc.property-hooks
Warning: DOMDocument::loadHTML(): Tag audio invalid in Entity, line: 4 in /in/bk8F6 on line 16 Warning: DOMDocument::loadHTML(): Tag track invalid in Entity, line: 5 in /in/bk8F6 on line 16 Warning: DOMDocument::loadHTML(): Tag track invalid in Entity, line: 6 in /in/bk8F6 on line 16 <!DOCTYPE html> <html><body> <audio src="foo.ogg"><track kind="captions" src="foo.en.vtt" srclang="en" label="English"><track kind="captions" src="foo.sv.vtt" srclang="sv" label="Svenska"></track></track></audio></body></html>

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