Try Dart! end-to-end test.

dart/site/try/src/compilation.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library trydart.compilation;
 
 import 'dart:html' show
     Blob,
     Element,
     ErrorEvent,
@@ skipping 273 matching lines @@
     int end = diagnostic['end'];
     if (begin == null) return;
     addDiagnostic(kind, message, begin, end);
   }
 
   onCrash(data) {
     consolePrint(data);
   }
 
   void consolePrint(message) {
+    if (window.parent != window) {
+      // Test support.
+      window.parent.postMessage('$message\n', '/');
+    }
     console.appendText('$message\n');
   }
 }
 
 void compilerIsolate(SendPort port) {
   // TODO(ahe): Restore when restoring deferred loading.
   // lazy.load().then((_) => port.listen(compile));
   ReceivePort replyTo = new ReceivePort();
   port.send(replyTo.sendPort);
   replyTo.listen((message) {
     List list = message as List;
     try {
       compile(list[0], list[1]);
     } catch (exception, stack) {
       port.send('$exception\n$stack');
     }
   });
   var notTrue = false; // Confuse the analyzer.
   if (notTrue) {
     cacheCompiler.compilerFor(null);
   }
 }