A more useful DocumentType.prototype.toString implementation than present-day browsers provide.

document.doctype.toString.coffee

# With thanks to Stewart Brodie for the reminder: http://goo.gl/IHa4p
# (See old version of this gist for a more roundabout hack I came up with)
window.DocumentType::toString = -> (new XMLSerializer).serializeToString @

document.doctype.toString.js

// With thanks to Stewart Brodie for the reminder: http://goo.gl/IHa4p
// (See old version of this gist for a more roundabout hack I came up with)
window.DocumentType.prototype.toString = function() {
  return (new XMLSerializer).serializeToString(this);
};