runtime/bin/vmservice/observatory/deployed/web/packages/html_import/src/boot.js

/*
 * Copyright 2013 The Polymer Authors. All rights reserved.
 * Use of this source code is governed by a BSD-style
 * license that can be found in the LICENSE file.
 */
(function(){

// bootstrap

// IE shim for CustomEvent
if (typeof window.CustomEvent !== 'function') {
  window.CustomEvent = function(inType) {
     var e = document.createEvent('HTMLEvents');
     e.initEvent(inType, true, true);
     return e;
  };
}

function bootstrap() {
  // preload document resource trees
  HTMLImports.importer.load(document, function() {
    HTMLImports.parser.parse(document);
    HTMLImports.readyTime = new Date().getTime();
    // send HTMLImportsLoaded when finished
    document.dispatchEvent(
      new CustomEvent('HTMLImportsLoaded', {bubbles: true})
    );
  });
};

if (document.readyState === 'complete') {
  bootstrap();
} else {
  window.addEventListener('DOMContentLoaded', bootstrap);
}

})();