buren

const CrossOriginLocalStorage = function(currentWindow, iframe, allowedOrigins, onMessage) {
  this.allowedOrigins = allowedOrigins;

  let childWindow;
  // some browser (don't remember which one) throw exception when you try to access
  // contentWindow for the first time, it works when you do that second time
  try {
      childWindow = iframe.contentWindow;
  } catch(e) {
      childWindow = iframe.contentWindow;