code: function loadSync() {
      debug('Loading environment scripts:');
      var a11ySuiteScriptPath = 'web-component-tester/data/a11ySuite.js';
      var scripts = get('environmentScripts');
      var a11ySuiteWillBeLoaded = window.__generatedByWct || scripts.indexOf(a11ySuiteScriptPath) > -1;
      // We can't inject a11ySuite when running the npm version because it is a
      // module-based script that needs `<script type=module>` and compilation
      // for browsers without module support.
      if (!a11ySuiteWillBeLoaded && !window.__wctUseNpm) {
          // wct is running as a bower dependency, load a11ySuite from data/
          scripts.push(a11ySuiteScriptPath);
      }
      scripts.forEach(function (path) {
          var url = expandUrl(path, get('root'));
          debug('Loading environment script:', url);
          // Synchronous load.
          document.write('<script src="' + encodeURI(url) +
              '"></script>'); // jshint ignore:line
      });
      debug('Environment scripts loaded');
      var imports = get('environmentImports');
      imports.forEach(function (path) {
          var url = expandUrl(path, get('root'));
          debug('Loading environment import:', url);
          // Synchronous load.
          document.write('<link rel="import" href="' + encodeURI(url) +
              '">'); // jshint ignore:line
      });
      debug('Environment imports loaded');
  }
docs: Loads all environment scripts ...synchronously ...after us.