Page::addHeaderData() 

\nn\t3::Page()->addHeaderData($html = ''); 

HTML code in ```` inject See \nn\t3::Page()->addHeader() for simpler version.

\nn\t3::Page()->addHeaderData( '' );
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| @return void

Source Code 

public function addHeaderData( $html = '' ) {
	$this->getPageRenderer()->addHeaderData( $html );
}
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