I acknowledge the original wording could have been clearer, and the narrative better organized.  There have been a few other incorporated ballot-comment changes which have improved upon the original wording, and I propose that this is now sufficiently clearer. See the current wording of section 1.2 SMART Web Messaging builds on  HTML5’s Web Messaging  specification, which allows web pages to communicate across domains. In JavaScript, calls to  window.postMessage  pass  MessageEvent  objects between windows. A  window.postMessage -based messaging approach allows flexible, standards-based integration that works across windows, frames and domains, and should be readily supportable in browser controls for any EHR capable of embedding a web application.