lib/combiner.js
function mergeDoctype( elem ) {
		merge( elem, function( old ) {
			utils.replaceElement( old, elem );
			destChildren[ destChildren.indexOf( old ) ] = elem;
		} );
	}
function mergeDoctype( elem ) {
		merge( elem, function( old ) {
			utils.replaceElement( old, elem );
			destChildren[ destChildren.indexOf( old ) ] = elem;
		} );
	}
function mergeDoctype ( elem ) { merge ( elem , function ( old ) { utils . replaceElement ( old , elem ) ; destChildren [ destChildren . indexOf ( old ) ] = elem ; } ) ; }
Merge doctype directives
@param {Object} elem New doctype directive
Merge doctype directives