Handling of comments seems to be invalid

[AlgoTrader]

The code:
// create empty document
var parser = new DOMParser;
var xmldoc = parser.parseFromString('');

// serialize document
var serializer = new XMLSerializer;
var doctxt = serializer.serializeToString(xmldoc);
console.log("xml:",doctxt);

The result:

I don't think it's a good way to serialize comments back.

BTW. the questions is to how to create Document for serialization if exported "classes" are DOMParser and XMLSerializer? Without tricks I can only create document by parsing an empty one

[jindw]

fixed
thanks for your report

BTW:
maybe DOMImplementation will help you.
require('xmldom/dom').DOMImplementation