diff --git a/pkg/dev_compiler/bin/devc.dart b/pkg/dev_compiler/bin/devc.dart
index 0e61cead8a00..255a9b936307 100755
--- a/pkg/dev_compiler/bin/devc.dart
+++ b/pkg/dev_compiler/bin/devc.dart
@@ -34,7 +34,7 @@ void main(List<String> args) {
     _showUsageAndExit();
   }
 
-  if (!options.dumpInfo) setupLogger(options.logLevel, print);
+  setupLogger(options.logLevel, print);
 
   if (options.serverMode) {
     new CompilerServer(options).start();
diff --git a/pkg/dev_compiler/lib/devc.dart b/pkg/dev_compiler/lib/devc.dart
index b257410496cc..bfe3d5d43ff0 100644
--- a/pkg/dev_compiler/lib/devc.dart
+++ b/pkg/dev_compiler/lib/devc.dart
@@ -28,6 +28,7 @@ import 'src/dependency_graph.dart';
 import 'src/info.dart' show LibraryInfo, CheckerResults;
 import 'src/options.dart';
 import 'src/report.dart';
+import 'src/utils.dart';
 
 /// Sets up the type checker logger to print a span that highlights error
 /// messages.
@@ -50,6 +51,7 @@ class Compiler {
   final SourceNode _entryNode;
   List<LibraryInfo> _libraries = <LibraryInfo>[];
   final List<CodeGenerator> _generators;
+  final bool _hashing;
   bool _failure = false;
 
   factory Compiler(CompilerOptions options,
@@ -65,7 +67,7 @@ class Compiler {
           ? new SummaryReporter()
           : new LogReporter(options.useColors);
     }
-    var graph = new SourceGraph(resolver.context, reporter);
+    var graph = new SourceGraph(resolver.context, reporter, options);
     var rules = new RestrictedRules(resolver.context.typeProvider, reporter,
         options: options);
     var checker = new CodeChecker(rules, reporter, options);
@@ -87,11 +89,14 @@ class Compiler {
           : new JSGenerator(outputDir, entryNode.uri, rules, options));
     }
     return new Compiler._(options, resolver, reporter, rules, checker, graph,
-        entryNode, generators);
+        entryNode, generators,
+        // TODO(sigmund): refactor to support hashing of the dart output?
+        options.serverMode && generators.length == 1 && !options.outputDart);
   }
 
   Compiler._(this._options, this._resolver, this._reporter, this._rules,
-      this._checker, this._graph, this._entryNode, this._generators);
+      this._checker, this._graph, this._entryNode, this._generators,
+      this._hashing);
 
   bool _buildSource(SourceNode node) {
     if (node is HtmlSourceNode) {
@@ -132,10 +137,12 @@ class Compiler {
     // dev_compiler runtime.
     if (_options.outputDir == null || _options.outputDart) return;
     assert(node.uri.scheme == 'package');
-    var filepath = path.join(_options.outputDir, node.uri.path);
+    var filepath = path.join(_options.outputDir, resourceOutputPath(node.uri));
     var dir = path.dirname(filepath);
     new Directory(dir).createSync(recursive: true);
-    new File(filepath).writeAsStringSync(node.source.contents.data);
+    var text = node.source.contents.data;
+    new File(filepath).writeAsStringSync(text);
+    if (_hashing) node.cachingHash = computeHash(text);
   }
 
   bool _isEntry(DartSourceNode node) {
@@ -177,8 +184,10 @@ class Compiler {
       _failure = true;
       if (!_options.forceCompile) return;
     }
+
     for (var cg in _generators) {
-      cg.generateLibrary(units, current, _reporter);
+      var hash = cg.generateLibrary(units, current, _reporter);
+      if (_hashing) node.cachingHash = hash;
     }
     _reporter.leaveLibrary();
   }
@@ -194,10 +203,8 @@ class Compiler {
     rebuild(_entryNode, _graph, _buildSource);
     _dumpInfoIfRequested();
     clock.stop();
-    if (_options.serverMode) {
-      var time = (clock.elapsedMilliseconds / 1000).toStringAsFixed(2);
-      print('Compiled ${_libraries.length} libraries in ${time} s\n');
-    }
+    var time = (clock.elapsedMilliseconds / 1000).toStringAsFixed(2);
+    _log.fine('Compiled ${_libraries.length} libraries in ${time} s\n');
     return new CheckerResults(
         _libraries, _rules, _failure || _options.forceCompile);
   }
@@ -215,7 +222,7 @@ class Compiler {
     clock.stop();
     if (changed > 0) _dumpInfoIfRequested();
     var time = (clock.elapsedMilliseconds / 1000).toStringAsFixed(2);
-    print("Compiled ${changed} libraries in ${time} s\n");
+    _log.fine("Compiled ${changed} libraries in ${time} s\n");
   }
 
   _dumpInfoIfRequested() {
@@ -251,7 +258,7 @@ class CompilerServer {
       exit(1);
     }
     var port = options.port;
-    print('[dev_compiler]: Serving $entryPath at http://0.0.0.0:$port/');
+    _log.fine('Serving $entryPath at http://0.0.0.0:$port/');
     var compiler = new Compiler(options);
     return new CompilerServer._(compiler, outDir, port, entryPath);
   }
@@ -260,17 +267,40 @@ class CompilerServer {
 
   Future start() async {
     var handler = const shelf.Pipeline()
-        .addMiddleware(shelf.createMiddleware(requestHandler: rebuildIfNeeded))
+        .addMiddleware(rebuildAndCache)
         .addHandler(shelf_static.createStaticHandler(outDir,
             defaultDocument: _entryPath));
     await shelf.serve(handler, '0.0.0.0', port);
     compiler.run();
   }
 
-  rebuildIfNeeded(shelf.Request request) {
-    var filepath = request.url.path;
-    if (filepath == '/$_entryPath' || filepath == '/') compiler._runAgain();
-  }
+  shelf.Handler rebuildAndCache(shelf.Handler handler) => (request) {
+    _log.fine('requested $GREEN_COLOR${request.url}$NO_COLOR');
+    // Trigger recompile only when requesting the HTML page.
+    var segments = request.url.pathSegments;
+    bool isEntryPage = segments.length == 0 || segments[0] == _entryPath;
+    if (isEntryPage) compiler._runAgain();
+
+    // To help browsers cache resources that don't change, we serve these
+    // resources under a path containing their hash:
+    //    /cached/{hash}/{path-to-file.js}
+    bool isCached = segments.length > 1 && segments[0] == 'cached';
+    if (isCached) {
+      // Changing the request lets us record that the hash prefix is handled
+      // here, and that the underlying handler should use the rest of the url to
+      // determine where to find the resource in the file system.
+      request = request.change(path: path.join('cached', segments[1]));
+    }
+    var response = handler(request);
+    var policy = isCached ? 'max-age=${24 * 60 * 60}' : 'no-cache';
+    var headers = {'cache-control': policy};
+    if (isCached) {
+      // Note: the cache-control header should be enough, but this doesn't hurt
+      // and can help renew the policy after it expires.
+      headers['ETag'] = segments[1];
+    }
+    return response.change(headers: headers);
+  };
 }
 
 final _log = new Logger('dev_compiler');
diff --git a/pkg/dev_compiler/lib/src/codegen/code_generator.dart b/pkg/dev_compiler/lib/src/codegen/code_generator.dart
index cda50d156e6d..c2920c49d109 100644
--- a/pkg/dev_compiler/lib/src/codegen/code_generator.dart
+++ b/pkg/dev_compiler/lib/src/codegen/code_generator.dart
@@ -129,6 +129,9 @@ abstract class CodeGenerator {
   CodeGenerator(String outDir, this.root, this.rules)
       : outDir = path.absolute(outDir);
 
-  void generateLibrary(Iterable<CompilationUnit> units, LibraryInfo info,
+  /// Return a hash, if any, that can be used for caching purposes. When two
+  /// invocations to this function return the same hash, the underlying
+  /// code-generator generated the same code.
+  String generateLibrary(Iterable<CompilationUnit> units, LibraryInfo info,
       CheckerReporter reporter);
 }
diff --git a/pkg/dev_compiler/lib/src/codegen/dart_codegen.dart b/pkg/dev_compiler/lib/src/codegen/dart_codegen.dart
index 6ddfc64e6762..3fa931bcf087 100644
--- a/pkg/dev_compiler/lib/src/codegen/dart_codegen.dart
+++ b/pkg/dev_compiler/lib/src/codegen/dart_codegen.dart
@@ -452,13 +452,14 @@ class DartGenerator extends codegenerator.CodeGenerator {
     libs.forEach(doOne);
   }
 
-  void generateLibrary(Iterable<CompilationUnit> units, LibraryInfo info,
+  String generateLibrary(Iterable<CompilationUnit> units, LibraryInfo info,
       CheckerReporter reporter) {
     _vm = new reifier.VariableManager();
     _extraImports = new Set<LibraryElement>();
     _generateLibrary(units, info, reporter);
     _extraImports = null;
     _vm = null;
+    return null;
   }
 }
 
@@ -485,7 +486,7 @@ class EmptyDartGenerator extends codegenerator.CodeGenerator {
   EmptyDartGenerator(String outDir, Uri root, TypeRules rules, this.options)
       : super(outDir, root, rules);
 
-  void generateLibrary(Iterable<CompilationUnit> units, LibraryInfo info,
+  String generateLibrary(Iterable<CompilationUnit> units, LibraryInfo info,
       CheckerReporter reporter) {
     for (var unit in units) {
       var outputDir = makeOutputDirectory(info, unit);
@@ -493,6 +494,7 @@ class EmptyDartGenerator extends codegenerator.CodeGenerator {
       generateUnit(unit, info, outputDir);
       reporter.leaveSource();
     }
+    return null;
   }
 
   void generateUnit(CompilationUnit unit, LibraryInfo info, String libraryDir) {
diff --git a/pkg/dev_compiler/lib/src/codegen/html_codegen.dart b/pkg/dev_compiler/lib/src/codegen/html_codegen.dart
index 80be996f4c77..06fb7c6f43ed 100644
--- a/pkg/dev_compiler/lib/src/codegen/html_codegen.dart
+++ b/pkg/dev_compiler/lib/src/codegen/html_codegen.dart
@@ -7,10 +7,11 @@ library dev_compiler.src.codegen.html_codegen;
 import 'package:html5lib/dom.dart';
 import 'package:html5lib/parser.dart' show parseFragment;
 import 'package:logging/logging.dart' show Logger;
+import 'package:path/path.dart' as path;
 
 import 'package:dev_compiler/src/dependency_graph.dart';
 import 'package:dev_compiler/src/options.dart';
-import 'package:dev_compiler/src/utils.dart' show colorOf;
+import 'package:dev_compiler/src/utils.dart' show colorOf, resourceOutputPath;
 
 import 'js_codegen.dart' show jsLibraryName, jsOutputPath;
 
@@ -42,42 +43,49 @@ String generateEntryHtml(HtmlSourceNode root, CompilerOptions options) {
   if (options.outputDart) return '${document.outerHtml}\n';
 
   var libraries = [];
+  var resources = [];
   visitInPostOrder(root, (n) {
     if (n is DartSourceNode) libraries.add(n);
+    if (n is ResourceSourceNode) resources.add(n);
   }, includeParts: false);
 
   String mainLibraryName;
-  var fragment = _loadRuntimeScripts(options);
+  var fragment = new DocumentFragment();
+  for (var resource in resources) {
+    var resourcePath = resourceOutputPath(resource.uri);
+    if (resource.cachingHash != null) {
+      resourcePath = _addHash(resourcePath, resource.cachingHash);
+    }
+    if (path.extension(resourcePath) == '.css') {
+      fragment.nodes.add(_cssInclude(resourcePath));
+    } else {
+      fragment.nodes.add(_libraryInclude(resourcePath));
+    }
+  }
   if (!options.checkSdk) fragment.nodes.add(_miniMockSdk);
   for (var lib in libraries) {
     var info = lib.info;
     if (info == null) continue;
     if (info.isEntry) mainLibraryName = jsLibraryName(info.library);
-    fragment.nodes.add(_libraryInclude(jsOutputPath(info, root.uri)));
+    var jsPath = jsOutputPath(info, root.uri);
+    if (lib.cachingHash != null) {
+      jsPath = _addHash(jsPath, lib.cachingHash);
+    }
+    fragment.nodes.add(_libraryInclude(jsPath));
   }
   fragment.nodes.add(_invokeMain(mainLibraryName));
   scripts[0].replaceWith(fragment);
   return '${document.outerHtml}\n';
 }
 
-/// A document fragment with scripts that check for harmony features and that
-/// inject our runtime.
-Node _loadRuntimeScripts(options) {
-  // TODO(sigmund): use dev_compiler to generate messages_widget in the future.
-  var widgetCode = options.serverMode
-      ? '<script src="dev_compiler/runtime/messages_widget.js"></script>\n'
-          '<link rel="stylesheet" href="dev_compiler/runtime/messages.css">'
-      : '';
-  return parseFragment(
-      '<script src="dev_compiler/runtime/harmony_feature_check.js"></script>\n'
-      '<script src="dev_compiler/runtime/dart_runtime.js"></script>\n'
-      '$widgetCode');
-}
-
 /// A script tag that loads the .js code for a compiled library.
 Node _libraryInclude(String jsUrl) =>
     parseFragment('<script src="$jsUrl"></script>\n');
 
+/// A tag that loads the .css code.
+Node _cssInclude(String cssUrl) =>
+    parseFragment('<link rel="stylesheet" href="$cssUrl">\n');
+
 /// A script tag that invokes the main function on the entry point library.
 Node _invokeMain(String mainLibraryName) {
   var code = mainLibraryName == null
@@ -86,6 +94,13 @@ Node _invokeMain(String mainLibraryName) {
   return parseFragment('<script>$code</script>\n');
 }
 
+/// Convert the outputPath to include the hash in it. This function is the
+/// reverse of what the server does to determine whether a request needs to have
+/// cache headers added to it.
+_addHash(String outPath, String hash) {
+  return path.join('cached', hash, outPath);
+}
+
 /// A script tag with a tiny mock of the core SDK. This is just used for testing
 /// some small samples.
 // TODO(sigmund,jmesserly): remove.
diff --git a/pkg/dev_compiler/lib/src/codegen/js_codegen.dart b/pkg/dev_compiler/lib/src/codegen/js_codegen.dart
index 028a5152f56f..1c70c19e778f 100644
--- a/pkg/dev_compiler/lib/src/codegen/js_codegen.dart
+++ b/pkg/dev_compiler/lib/src/codegen/js_codegen.dart
@@ -960,9 +960,8 @@ class JSCodegenVisitor extends GeneralizingAstVisitor with ConversionVisitor {
           new JS.VariableDeclaration(last.name.name),
           _visit(lastInitializer.target)));
 
-      var result = <JS.Expression>[
-        new JS.VariableDeclarationList('let', variables)
-      ];
+      var result =
+          <JS.Expression>[new JS.VariableDeclarationList('let', variables)];
       result.addAll(_visitList(lastInitializer.cascadeSections));
       _cascadeTarget = savedCascadeTemp;
       return _statement(result.map((e) => new JS.ExpressionStatement(e)));
@@ -1017,9 +1016,8 @@ class JSCodegenVisitor extends GeneralizingAstVisitor with ConversionVisitor {
 
   void _flushLibraryProperties(List<JS.Statement> body) {
     if (_properties.isEmpty) return;
-    body.add(js.statement('dart.copyProperties($_EXPORTS, { # });', [
-      _properties.map(_emitTopLevelProperty)
-    ]));
+    body.add(js.statement('dart.copyProperties($_EXPORTS, { # });',
+        [_properties.map(_emitTopLevelProperty)]));
     _properties.clear();
   }
 
@@ -1609,9 +1607,8 @@ class JSCodegenVisitor extends GeneralizingAstVisitor with ConversionVisitor {
   @override
   visitListLiteral(ListLiteral node) {
     // TODO(jmesserly): make this faster. We're wasting an array.
-    var list = js.call('new List.from(#)', [
-      new JS.ArrayInitializer(_visitList(node.elements))
-    ]);
+    var list = js.call('new List.from(#)',
+        [new JS.ArrayInitializer(_visitList(node.elements))]);
     if (node.constKeyword != null) {
       list = js.commentExpression('Unimplemented const', list);
     }
@@ -1926,7 +1923,7 @@ class JSGenerator extends CodeGenerator {
   JSGenerator(String outDir, Uri root, TypeRules rules, this.options)
       : super(outDir, root, rules);
 
-  void generateLibrary(Iterable<CompilationUnit> units, LibraryInfo info,
+  String generateLibrary(Iterable<CompilationUnit> units, LibraryInfo info,
       CheckerReporter reporter) {
     JS.Program jsTree =
         new JSCodegenVisitor(info, rules).generateLibrary(units, reporter);
@@ -1937,14 +1934,19 @@ class JSGenerator extends CodeGenerator {
     if (options.emitSourceMaps) {
       var outFilename = path.basename(outputPath);
       var printer = new srcmaps.Printer(outFilename);
-      _writeNode(new SourceMapPrintingContext(
-          printer, path.dirname(outputPath)), jsTree);
+      _writeNode(
+          new SourceMapPrintingContext(printer, path.dirname(outputPath)),
+          jsTree);
       printer.add('//# sourceMappingURL=$outFilename.map');
       // Write output file and source map
-      new File(outputPath).writeAsStringSync(printer.text);
+      var text = printer.text;
+      new File(outputPath).writeAsStringSync(text);
       new File('$outputPath.map').writeAsStringSync(printer.map);
+      return computeHash(text);
     } else {
-      new File(outputPath).writeAsStringSync(jsNodeToString(jsTree));
+      var text = jsNodeToString(jsTree);
+      new File(outputPath).writeAsStringSync(text);
+      return computeHash(text);
     }
   }
 }
diff --git a/pkg/dev_compiler/lib/src/dependency_graph.dart b/pkg/dev_compiler/lib/src/dependency_graph.dart
index 4b2c4c189f07..d7c61199a04f 100644
--- a/pkg/dev_compiler/lib/src/dependency_graph.dart
+++ b/pkg/dev_compiler/lib/src/dependency_graph.dart
@@ -27,6 +27,7 @@ import 'package:path/path.dart' as path;
 import 'package:source_span/source_span.dart' show SourceSpan;
 
 import 'info.dart';
+import 'options.dart';
 import 'report.dart';
 import 'utils.dart';
 
@@ -41,8 +42,9 @@ class SourceGraph {
   /// Analyzer used to resolve source files.
   final AnalysisContext _context;
   final CheckerReporter _reporter;
+  final CompilerOptions _options;
 
-  SourceGraph(this._context, this._reporter);
+  SourceGraph(this._context, this._reporter, this._options);
 
   /// Node associated with a resolved [uri].
   SourceNode nodeFromUri(Uri uri) {
@@ -75,6 +77,10 @@ abstract class SourceNode {
   /// Last stamp read from `source.modificationStamp`.
   int _lastStamp = 0;
 
+  /// A hash used to help browsers cache the output that would be produced from
+  /// building this node.
+  String cachingHash;
+
   /// Whether we need to rebuild this source file.
   bool needsRebuild = false;
 
@@ -128,11 +134,13 @@ class HtmlSourceNode extends SourceNode {
 
   HtmlSourceNode(uri, source, graph) : super(uri, source) {
     var prefix = 'package:dev_compiler/runtime';
-    runtimeDeps
-      ..add(graph.nodeFromUri(Uri.parse('$prefix/dart_runtime.js')))
-      ..add(graph.nodeFromUri(Uri.parse('$prefix/harmony_feature_check.js')))
-      ..add(graph.nodeFromUri(Uri.parse('$prefix/messages_widget.js')))
-      ..add(graph.nodeFromUri(Uri.parse('$prefix/messages.css')));
+    var files = ['harmony_feature_check.js', 'dart_runtime.js'];
+    if (graph._options.serverMode) {
+      files.addAll(const ['messages_widget.js', 'messages.css']);
+    }
+    files.forEach((file) {
+      runtimeDeps.add(graph.nodeFromUri(Uri.parse('$prefix/$file')));
+    });
   }
 
   void update(SourceGraph graph) {
@@ -340,20 +348,22 @@ rebuild(SourceNode start, SourceGraph graph, bool build(SourceNode node)) {
   // of those transitive cases, but is not sufficient. See
   // https://github.com/dart-lang/dev_compiler/issues/76
   var apiChangeDetected = new HashSet<SourceNode>();
-  bool structureHasChanged = false;
+  bool htmlNeedsRebuild = false;
 
   bool shouldBuildNode(SourceNode n) {
     if (n.needsRebuild) return true;
-    if (n is HtmlSourceNode) return structureHasChanged;
+    if (n is HtmlSourceNode) return htmlNeedsRebuild;
     if (n is ResourceSourceNode) return false;
     return (n as DartSourceNode).imports
         .any((i) => apiChangeDetected.contains(i));
   }
 
   visitInPostOrder(start, (n) {
-    if (n.structureChanged) structureHasChanged = true;
+    if (n.structureChanged) htmlNeedsRebuild = true;
     if (shouldBuildNode(n)) {
+      var oldHash = n.cachingHash;
       if (build(n)) apiChangeDetected.add(n);
+      if (oldHash != n.cachingHash) htmlNeedsRebuild = true;
     } else if (n is DartSourceNode &&
         n.exports.any((e) => apiChangeDetected.contains(e))) {
       apiChangeDetected.add(n);
diff --git a/pkg/dev_compiler/lib/src/utils.dart b/pkg/dev_compiler/lib/src/utils.dart
index 211a726a6efa..a30473d5290f 100644
--- a/pkg/dev_compiler/lib/src/utils.dart
+++ b/pkg/dev_compiler/lib/src/utils.dart
@@ -22,6 +22,7 @@ import 'package:analyzer/src/generated/engine.dart'
 import 'package:analyzer/src/generated/source.dart' show Source;
 import 'package:analyzer/src/generated/element.dart';
 import 'package:analyzer/analyzer.dart' show parseDirectives;
+import 'package:crypto/crypto.dart' show CryptoUtils, MD5;
 import 'package:source_span/source_span.dart';
 
 bool isDartPrivateLibrary(LibraryElement library) {
@@ -183,6 +184,8 @@ String colorOf(String levelName) {
 const String _RED_COLOR = '\u001b[31m';
 const String _MAGENTA_COLOR = '\u001b[35m';
 const String _CYAN_COLOR = '\u001b[36m';
+const String GREEN_COLOR = '\u001b[32m';
+const String NO_COLOR = '\u001b[0m';
 
 class OutWriter {
   final String _path;
@@ -256,3 +259,11 @@ SourceSpan spanForNode(CompilationUnit unit, Source source, AstNode node) {
   return new SourceSpan(locationForOffset(unit, uri, begin),
       locationForOffset(unit, uri, end), '$text');
 }
+
+/// Computes a hash for the given contents.
+String computeHash(String contents) {
+  if (contents == null || contents == '') return null;
+  return CryptoUtils.bytesToHex((new MD5()..add(contents.codeUnits)).close());
+}
+
+String resourceOutputPath(Uri resourceUri) => resourceUri.path;
diff --git a/pkg/dev_compiler/pubspec.yaml b/pkg/dev_compiler/pubspec.yaml
index bf1928a34911..ee8e2eff81cd 100644
--- a/pkg/dev_compiler/pubspec.yaml
+++ b/pkg/dev_compiler/pubspec.yaml
@@ -7,6 +7,7 @@ dependencies:
       ref: master
   args: ^0.12.1
   cli_util: ^0.0.1
+  crypto: ^0.9.0
   dart_style:
     git:
       url: git@github.com:dart-lang/dart_style.git
@@ -14,7 +15,7 @@ dependencies:
   html5lib: ^0.12.0
   logging: ^0.9.2
   path: ^1.3.0
-  shelf: ^0.5.7
+  shelf: ^0.6.0
   shelf_static: ^0.2.1
   source_maps: ^0.10.0
   source_span: ^1.0.0
diff --git a/pkg/dev_compiler/test/codegen/expect/server_mode/dev_compiler/runtime/dart_runtime.js b/pkg/dev_compiler/test/codegen/expect/server_mode/dev_compiler/runtime/dart_runtime.js
new file mode 100644
index 000000000000..041ad24ae10f
--- /dev/null
+++ b/pkg/dev_compiler/test/codegen/expect/server_mode/dev_compiler/runtime/dart_runtime.js
@@ -0,0 +1,357 @@
+// Copyright (c) 2015, 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.
+
+var dart;
+(function (dart) {
+  var defineProperty = Object.defineProperty;
+  var getOwnPropertyDescriptor = Object.getOwnPropertyDescriptor;
+  var getOwnPropertyNames = Object.getOwnPropertyNames;
+
+  // Adapted from Angular.js
+  var FN_ARGS = /^function\s*[^\(]*\(\s*([^\)]*)\)/m;
+  var FN_ARG_SPLIT = /,/;
+  var FN_ARG = /^\s*(_?)(\S+?)\1\s*$/;
+  var STRIP_COMMENTS = /((\/\/.*$)|(\/\*[\s\S]*?\*\/))/mg;
+
+  function formalParameterList(fn) {
+    var fnText,argDecl;
+    var args=[];
+    fnText = fn.toString().replace(STRIP_COMMENTS, '');
+    argDecl = fnText.match(FN_ARGS);
+
+    var r = argDecl[1].split(FN_ARG_SPLIT);
+    for(var a in r){
+      var arg = r[a];
+      arg.replace(FN_ARG, function(all, underscore, name){
+        args.push(name);
+      });
+    }
+    return args;
+  }
+
+  function dload(obj, field) {
+    if (!(field in obj)) {
+      throw new core.NoSuchMethodError(obj, field);
+    }
+    return obj[field];
+  }
+  dart.dload = dload;
+
+  // TODO(jmesserly): this should call noSuchMethod, not throw.
+  function throwNoSuchMethod(obj, name, args, opt_func) {
+    if (obj === void 0) obj = opt_func;
+    throw new core.NoSuchMethodError(obj, name, args);
+  }
+
+  function checkAndCall(f, obj, args, name) {
+    if (!(f instanceof Function)) {
+      // Grab the `call` method if it's not a function.
+      if (f !== null) f = f.call;
+      if (!(f instanceof Function)) {
+        throwNoSuchMethod(obj, method, args);
+      }
+    }
+    var formals = formalParameterList(f);
+    // TODO(vsm): Type check args!  We need to encode sufficient type info on f.
+    if (formals.length < args.length) {
+      throwNoSuchMethod(obj, name, args, f);
+    } else if (formals.length > args.length) {
+      for (var i = args.length; i < formals.length; ++i) {
+        if (formals[i].indexOf("opt$") != 0) {
+          throwNoSuchMethod(obj, name, args, f);
+        }
+      }
+    }
+    return f.apply(obj, args);
+  }
+
+  function dinvokef(f/*, ...args*/) {
+    var args = Array.prototype.slice.call(arguments, 1);
+    return checkAndCall(f, void 0, args, 'call');
+  }
+  dart.dinvokef = dinvokef;
+
+  function dinvoke(obj, method/*, ...args*/) {
+    var args = Array.prototype.slice.call(arguments, 2);
+    return checkAndCall(obj[method], obj, args, method);
+  }
+  dart.dinvoke = dinvoke;
+
+  function dindex(obj, index) {
+    return checkAndCall(obj.get, obj, [index], '[]');
+  }
+  dart.dindex = dindex;
+
+  function dsetindex(obj, index, value) {
+    return checkAndCall(obj.set, obj, [index, value], '[]=');
+  }
+  dart.dsetindex = dindex;
+
+  function dbinary(left, op, right) {
+    return checkAndCall(left[op], left, [right], op);
+  }
+  dart.dbinary = dbinary;
+
+  function as_(obj, type) {
+    // TODO(vsm): Implement.
+    // if (obj == null || is(obj, type)) return obj;
+    // throw new core.CastError();
+    return obj;
+  }
+  dart.as = as_;
+
+  function is(obj, type) {
+    // TODO(vsm): Implement.
+    throw new core.UnimplementedError();
+  }
+  dart.is = is;
+
+  function isGroundType(type) {
+    // TODO(vsm): Implement.
+    throw new core.UnimplementedError();
+  }
+  dart.isGroundType = isGroundType;
+
+  function arity(f) {
+    // TODO(vsm): Implement.
+    throw new core.UnimplementedError();
+  }
+  dart.arity = arity;
+
+  function equals(x, y) {
+    if (x === null || y === null) return x === y;
+    var eq = x['=='];
+    return eq ? eq.call(x, y) : x === y;
+  }
+  dart.equals = equals;
+
+  /** Checks that `x` is not null or undefined. */
+  function notNull(x) {
+    if (x == null) throw 'expected not-null value';
+    return x;
+  }
+  dart.notNull = notNull;
+
+  /**
+   * Defines a lazy property.
+   * After initial get or set, it will replace itself with a value property.
+   */
+  // TODO(jmesserly): is this the best implementation for JS engines?
+  // TODO(jmesserly): reusing descriptor objects has been shown to improve
+  // performance in other projects (e.g. webcomponents.js ShadowDOM polyfill).
+  function defineLazyProperty(to, name, desc) {
+    var init = desc.get;
+    var writable = !!desc.set;
+    function lazySetter(value) {
+      defineProperty(to, name, { value: value, writable: writable });
+    }
+    function lazyGetter() {
+      // Clear the init function to detect circular initialization.
+      var f = init;
+      if (f === null) throw 'circular initialization for field ' + name;
+      init = null;
+
+      // Compute and store the value.
+      var value = f();
+      lazySetter(value);
+      return value;
+    }
+    desc.get = lazyGetter;
+    desc.configurable = true;
+    if (writable) desc.set = lazySetter;
+    defineProperty(to, name, desc);
+  }
+
+  function defineLazyProperties(to, from) {
+    var names = getOwnPropertyNames(from);
+    for (var i = 0; i < names.length; i++) {
+      var name = names[i];
+      defineLazyProperty(to, name, getOwnPropertyDescriptor(from, name));
+    }
+  }
+  dart.defineLazyProperties = defineLazyProperties;
+
+  /**
+   * Copy properties from source to destination object.
+   * This operation is commonly called `mixin` in JS.
+   */
+  function copyProperties(to, from) {
+    var names = getOwnPropertyNames(from);
+    for (var i = 0; i < names.length; i++) {
+      var name = names[i];
+      defineProperty(to, name, getOwnPropertyDescriptor(from, name));
+    }
+    return to;
+  }
+  dart.copyProperties = copyProperties;
+
+  /**
+   * Returns a new type that mixes members from base and all mixins.
+   *
+   * Each mixin applies in sequence, with further to the right ones overriding
+   * previous entries.
+   *
+   * For each mixin, we only take its own properties, not anything from its
+   * superclass (prototype).
+   */
+  function mixin(base/*, ...mixins*/) {
+    // Inherit statics from Base to simulate ES6 class inheritance
+    // Conceptually this is: `class Mixin extends base {}`
+    function Mixin() {
+      // TODO(jmesserly): since we're using initializers and not constructors,
+      // we can just skip directly to dart.Object.
+      dart.Object.apply(this, arguments);
+    }
+    Mixin.__proto__ = base;
+    Mixin.prototype = Object.create(base.prototype);
+    Mixin.prototype.constructor = Mixin;
+    // Copy each mixin, with later ones overwriting earlier entries.
+    var mixins = Array.prototype.slice.call(arguments, 1);
+    for (var i = 0; i < mixins.length; i++) {
+      copyProperties(Mixin.prototype, mixins[i].prototype);
+    }
+    // Create an initializer for the mixin, so when derived constructor calls
+    // super, we can correctly initialize base and mixins.
+    var baseCtor = base.prototype[base.name];
+    Mixin.prototype[base.name] = function() {
+      // Run mixin initializers. They cannot have arguments.
+      // Run them backwards so most-derived mixin is initialized first.
+      for (var i = mixins.length - 1; i >= 0; i--) {
+        var mixin = mixins[i];
+        mixin.prototype[mixin.name].call(this);
+      }
+      // Run base initializer.
+      baseCtor.apply(this, arguments);
+    }
+    return Mixin;
+  }
+  dart.mixin = mixin;
+
+  /**
+   * Creates a dart:collection LinkedHashMap.
+   *
+   * For a map with string keys an object literal can be used, for example
+   * `map({'hi': 1, 'there': 2})`.
+   *
+   * Otherwise an array should be used, for example `map([1, 2, 3, 4])` will
+   * create a map with keys [1, 3] and values [2, 4]. Each key-value pair
+   * should be adjacent entries in the array.
+   *
+   * For a map with no keys the function can be called with no arguments, for
+   * example `map()`.
+   */
+  // TODO(jmesserly): this could be faster
+  function map(values) {
+    var map = new collection.LinkedHashMap();
+    if (Array.isArray(values)) {
+      for (var i = 0, end = values.length - 1; i < end; i += 2) {
+        var key = values[i];
+        var value = values[i + 1];
+        map.set(key, value);
+      }
+    } else if (typeof values === 'object') {
+      var keys = Object.getOwnPropertyNames(values);
+      for (var i = 0; i < keys.length; i++) {
+        var key = keys[i];
+        var value = values[key];
+        map.set(key, value);
+      }
+    }
+    return map;
+  }
+
+  function assert(condition) {
+    // TODO(jmesserly): throw assertion error.
+    if (!condition) throw 'assertion failed';
+  }
+  dart.assert = assert;
+
+  function throw_(obj) { throw obj; }
+  dart.throw_ = throw_;
+
+  /**
+   * Given a class and an initializer method name, creates a constructor
+   * function with the same name. For example `new SomeClass.name(args)`.
+   */
+  function defineNamedConstructor(clazz, name) {
+    var proto = clazz.prototype;
+    var initMethod = proto[clazz.name + '$' + name];
+    var ctor = function() { return initMethod.apply(this, arguments); }
+    ctor.prototype = proto;
+    clazz[name] = ctor;
+  }
+  dart.defineNamedConstructor = defineNamedConstructor;
+
+  function stackTrace(exception) {
+    throw new core.UnimplementedError();
+  }
+  dart.stackTrace = stackTrace;
+
+  /** The Symbol for storing type arguments on a specialized generic type. */
+  dart.typeSignature = Symbol('typeSignature');
+
+  /** Memoize a generic type constructor function. */
+  function generic(typeConstructor) {
+    var length = typeConstructor.length;
+    if (length < 1) throw 'must have at least one generic type argument';
+
+    var resultMap = new Map();
+    function makeGenericType(/*...arguments*/) {
+      if (arguments.length != length) {
+        throw 'requires ' + length + ' type arguments';
+      }
+
+      var value = resultMap;
+      for (var i = 0; i < length; i++) {
+        var arg = arguments[i];
+        // TODO(jmesserly): assume `dynamic` here?
+        if (arg === void 0) throw 'undefined is not allowed as a type argument';
+
+        var map = value;
+        value = map.get(arg);
+        if (value === void 0) {
+          if (i + 1 == length) {
+            value = typeConstructor.apply(null, arguments);
+            // Save the type constructor and arguments for reflection.
+            if (value) {
+              var args = Array.prototype.slice.call(arguments);
+              value[dart.typeSignature] = [makeGenericType].concat(args);
+            }
+          } else {
+            value = new Map();
+          }
+          map.set(arg, value);
+        }
+      }
+      return value;
+    }
+    return makeGenericType;
+  }
+  dart.generic = generic;
+
+
+  /**
+   * Implements Dart constructor behavior. Because of V8 `super` [constructor
+   * restrictions](https://code.google.com/p/v8/issues/detail?id=3330#c65) we
+   * cannot currently emit actual ES6 constructors with super calls. Instead
+   * we use the same trick as named constructors, and do them as instance
+   * methods that perform initialization.
+   */
+  // TODO(jmesserly): we'll need to rethink this once the ES6 spec and V8
+  // settles. See <https://github.com/dart-lang/dart-dev-compiler/issues/51>.
+  // Performance of this pattern is likely to be bad.
+  dart.Object = function Object() {
+    // Get the class name for this instance.
+    var name = this.constructor.name;
+    // Call the default constructor.
+    var init = this[name];
+    var result = void 0;
+    if (init) result = init.apply(this, arguments);
+    return result === void 0 ? this : result;
+  };
+  // The initializer for dart.Object
+  dart.Object.prototype.Object = function() {};
+  dart.Object.prototype.constructor = dart.Object;
+
+})(dart || (dart = {}));
diff --git a/pkg/dev_compiler/test/codegen/expect/server_mode/dev_compiler/runtime/harmony_feature_check.js b/pkg/dev_compiler/test/codegen/expect/server_mode/dev_compiler/runtime/harmony_feature_check.js
new file mode 100644
index 000000000000..9007bc75d6f8
--- /dev/null
+++ b/pkg/dev_compiler/test/codegen/expect/server_mode/dev_compiler/runtime/harmony_feature_check.js
@@ -0,0 +1,28 @@
+// Copyright (c) 2015, 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.
+
+// Feature test for harmony support, alert if not present.
+(function () {
+  try {
+    var f = new Function(
+      '"use strict";'+
+      'class C {' +
+        'constructor(x) { this.x = x; };' +
+        // TODO(jmesserly): arrow functions on V8 don't have lexical this yet.
+        // https://code.google.com/p/v8/issues/detail?id=2700
+        '["foo"]() { var self = this; return x => self.x + x; };' +
+      '};' +
+      'return new C(42).foo()(100);');
+    if (f() == 142) return; // supported!
+  } catch (e) {
+  }
+
+  var message = 'This script needs EcmaScript 6 features ' +
+      'like `class` and `=>`. Please run in a browser with support, ' +
+      'for example: chrome --js-flags="--harmony-arrow-functions' +
+      ' --harmony-classes --harmony-computed-property-names"';
+  console.error(message);
+  alert(message);
+
+})();
diff --git a/pkg/dev_compiler/test/codegen/expect/server_mode/dev_compiler/runtime/messages.css b/pkg/dev_compiler/test/codegen/expect/server_mode/dev_compiler/runtime/messages.css
new file mode 100644
index 000000000000..0f99a9017823
--- /dev/null
+++ b/pkg/dev_compiler/test/codegen/expect/server_mode/dev_compiler/runtime/messages.css
@@ -0,0 +1,78 @@
+/** Copyright (c) 2015, 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. **/
+.dev-compiler-messages {
+  position: fixed;
+  bottom: 0;
+  right: 0;
+  max-width: 80vw;
+  z-index: 10000;
+  font-family: sans-serif !important;
+}
+.dev-compiler-messages .message {
+  padding: 0.6em;
+  background: black;
+  color: white;
+  border: solid 1px #666;
+  border-bottom: 0px;
+  text-overflow: ellipsis;
+  overflow-x: hidden;
+}
+.dev-compiler-messages .fine {
+  color: green;
+}
+.dev-compiler-messages .info {
+  color: yellow;
+}
+.dev-compiler-messages .warning {
+  color: orange;
+}
+.dev-compiler-messages .severe {
+  color: red;
+}
+.dev-compiler-messages div.text {
+  white-space: nowrap;
+  cursor: pointer;
+}
+.dev-compiler-messages div.text.expanded {
+  white-space: normal;
+}
+.dev-compiler-messages div.text a {
+  color: #CCF;
+  text-decoration: bold;
+}
+.dev-compiler-messages div.menu {
+  text-align: right;
+}
+.dev-compiler-messages .menu div {
+  display: inline-block;
+  background: #666;
+  font-weight: bold;
+  cursor: pointer;
+  border: solid 1px black;
+  padding: 0.6em 1em;
+}
+.dev-compiler-messages .menu div.active {
+  background: black;
+}
+.dev-compiler-messages .menu div .num {
+  color: white;
+}
+.dev-compiler-messages .content {
+  max-height: 75vh;
+  font-size: 1em;
+  overflow-y: auto;
+}
+.dev-compiler-messages .content > div {
+  display: none;
+}
+.dev-compiler-messages .content > div.active {
+  display: block;
+}
+
+.dev-compiler-messages .content span.text {
+  padding: 0.4em 0.2em 0.2em 2em;
+  white-space: pre;
+  display: block;
+  font-family: monospace !important;
+}
diff --git a/pkg/dev_compiler/test/codegen/expect/server_mode/dev_compiler/runtime/messages_widget.js b/pkg/dev_compiler/test/codegen/expect/server_mode/dev_compiler/runtime/messages_widget.js
new file mode 100644
index 000000000000..e8330020774f
--- /dev/null
+++ b/pkg/dev_compiler/test/codegen/expect/server_mode/dev_compiler/runtime/messages_widget.js
@@ -0,0 +1,6377 @@
+// Generated by dart2js, the Dart to JavaScript compiler version: 1.9.0-dev.10.3.
+(function($){
+function map(a){a=Object.create(null)
+a.x=0
+delete a.x
+return a}var A=map()
+var B=map()
+var C=map()
+var D=map()
+var E=map()
+var F=map()
+var G=map()
+var H=map()
+var J=map()
+var K=map()
+var L=map()
+var M=map()
+var N=map()
+var O=map()
+var P=map()
+var Q=map()
+var R=map()
+var S=map()
+var T=map()
+var U=map()
+var V=map()
+var W=map()
+var X=map()
+var Y=map()
+var Z=map()
+function I(){}
+init()
+$=I.p
+$.HU=function(){}
+function parseReflectionData(a){"use strict"
+function generateAccessor(a8,a9,b0){var g=a8.split("-")
+var f=g[0]
+var e=f.length
+var d=f.charCodeAt(e-1)
+var c
+if(g.length>1)c=true
+else c=false
+d=d>=60&&d<=64?d-59:d>=123&&d<=126?d-117:d>=37&&d<=43?d-27:0
+if(d){var b=d&3
+var a0=d>>2
+var a1=f=f.substring(0,e-1)
+var a2=f.indexOf(":")
+if(a2>0){a1=f.substring(0,a2)
+f=f.substring(a2+1)}if(b){var a3=b&2?"r":""
+var a4=b&1?"this":"r"
+var a5="return "+a4+"."+f
+var a6=b0+".prototype.g"+a1+"="
+var a7="function("+a3+"){"+a5+"}"
+if(c)a9.push(a6+"$reflectable("+a7+");\n")
+else a9.push(a6+a7+";\n")}if(a0){var a3=a0&2?"r,v":"v"
+var a4=a0&1?"this":"r"
+var a5=a4+"."+f+"=v"
+var a6=b0+".prototype.s"+a1+"="
+var a7="function("+a3+"){"+a5+"}"
+if(c)a9.push(a6+"$reflectable("+a7+");\n")
+else a9.push(a6+a7+";\n")}}return f}function defineClass(a1,a2){var g=[]
+var f="function "+a1+"("
+var e=""
+var d=""
+for(var c=0;c<a2.length;c++){if(c!=0)f+=", "
+var b=generateAccessor(a2[c],g,a1)
+d+="'"+b+"',"
+var a0="parameter_"+b
+f+=a0
+e+="this."+b+" = "+a0+";\n"}f+=") {\n"+e+"}\n"
+f+=a1+".builtin$cls=\""+a1+"\";\n"
+f+="$desc=$collectedClasses."+a1+";\n"
+f+="if($desc instanceof Array) $desc = \$desc[1];\n"
+f+=a1+".prototype = $desc;\n"
+if(typeof defineClass.name!="string")f+=a1+".name=\""+a1+"\";\n"
+f+=a1+"."+"$__fields__"+"=["+d+"];\n"
+f+=g.join("")
+return f}init.createNewIsolate=function(){return new I()}
+init.classIdExtractor=function(b){return b.constructor.name}
+init.classFieldsExtractor=function(b){var g=b.constructor.$__fields__
+if(!g)return[]
+var f=[]
+f.length=g.length
+for(var e=0;e<g.length;e++)f[e]=b[g[e]]
+return f}
+init.instanceFromClassId=function(b){return new init.allClasses[b]()}
+init.initializeEmptyInstance=function(b,c,d){init.allClasses[b].apply(c,d)
+return c}
+var z=function(){function tmp(){}return function(a0,a1){if(a1==null){var g=a0.prototype
+g.constructor=a0
+g.$isa=a0
+return g}tmp.prototype=a1.prototype
+var f=new tmp()
+var e=a0.prototype
+var d=Object.keys(e)
+for(var c=0;c<d.length;c++){var b=d[c]
+f[b]=e[b]}f["$is"+a0.name]=a0
+f.constructor=a0
+a0.prototype=f
+return f}}()
+function finishClasses(a3){var g=init.allClasses
+a3.combinedConstructorFunction+="return [\n"+a3.constructorsList.join(",\n  ")+"\n]"
+var f=new Function("$collectedClasses",a3.combinedConstructorFunction)(a3.collected)
+a3.combinedConstructorFunction=null
+for(var e=0;e<f.length;e++){var d=f[e]
+var c=d.name
+var b=a3.collected[c]
+var a0=$
+if(b instanceof Array){a0=b[0]||$
+b=b[1]}g[c]=d
+a0[c]=d}f=null
+var a1=init.finishedClasses
+function finishClass(c0){if(a1[c0])return
+a1[c0]=true
+var a4=a3.pending[c0]
+if(a4&&a4.indexOf("+")>0){var a5=a4.split("+")
+a4=a5[0]
+var a6=a5[1]
+finishClass(a6)
+var a7=g[a6]
+var a8=a7.prototype
+var a9=g[c0].prototype
+var b0=Object.keys(a8)
+for(var b1=0;b1<b0.length;b1++){var b2=b0[b1]
+if(!u.call(a9,b2))a9[b2]=a8[b2]}}if(!a4||typeof a4!="string"){z(g[c0],null)
+return}finishClass(a4)
+var b3=g[a4]
+if(!b3)b3=existingIsolateProperties[a4]
+var b4=g[c0]
+var b5=z(b4,b3)
+if(Object.prototype.hasOwnProperty.call(b5,"%")){var b6=b5["%"].split(";")
+if(b6[0]){var b7=b6[0].split("|")
+for(var b1=0;b1<b7.length;b1++){init.interceptorsByTag[b7[b1]]=b4
+init.leafTags[b7[b1]]=true}}if(b6[1]){b7=b6[1].split("|")
+if(b6[2]){var b8=b6[2].split("|")
+for(var b1=0;b1<b8.length;b1++){var b9=g[b8[b1]]
+b9.$nativeSuperclassTag=b7[0]}}for(b1=0;b1<b7.length;b1++){init.interceptorsByTag[b7[b1]]=b4
+init.leafTags[b7[b1]]=false}}}}var a2=Object.keys(a3.pending)
+for(var e=0;e<a2.length;e++)finishClass(a2[e])}function processClassData(a9,b0,b1){var g={}
+var f
+var e=Object.keys(b0)
+for(var d=0;d<e.length;d++){var c=e[d]
+var b=c.substring(0,1)
+if(c==="static")processStatics(init.statics[a9]=b0[c],b1)
+else if(b==="+"){w[f]=c.substring(1)
+var a0=b0[c]
+if(a0>0)b0[f].$reflectable=a0}else if(b==="*"){g[f].$defaultValues=b0[c]
+var a1=g.$methodsWithOptionalArguments
+if(!a1)g.$methodsWithOptionalArguments=a1={}
+a1[c]=f}else{var a2=b0[c]
+if(c!=="^"&&a2!=null&&a2.constructor===Array&&c!=="<>")addStubs(g,a2,c,false,b0,[])
+else g[f=c]=a2}}var a3=g["^"],a4,a5,a6=a3
+var a7=a6.split(";")
+a6=a7[1]==""?[]:a7[1].split(",")
+a5=a7[0]
+a4=a5.split(":")
+if(a4.length==2){a5=a4[0]
+var a8=a4[1]
+if(a8)g.$signature=function(b2){return function(){return init.metadata[b2]}}(a8)}if(a5)b1.pending[a9]=a5
+b1.combinedConstructorFunction+=defineClass(a9,a6)
+b1.constructorsList.push(a9)
+b1.collected[a9]=[m,g]
+i.push(a9)}function processStatics(a2,a3){var g=Object.keys(a2)
+for(var f=0;f<g.length;f++){var e=g[f]
+if(e==="^")continue
+var d=a2[e]
+var c=e.substring(0,1)
+var b
+if(c==="+"){v[b]=e.substring(1)
+var a0=a2[e]
+if(a0>0)a2[b].$reflectable=a0
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+init.globalState.e.Q.B7(new H.IY(n,new H.jl(w,v,u,t,s,r),"worker-start"))
+init.globalState.c=n
+init.globalState.e.bL()
+break
+case"spawn-worker":break
+case"message":if(y.p(z,"port")!=null)J.jV(y.p(z,"port"),y.p(z,"msg"))
+init.globalState.e.bL()
+break
+case"close":init.globalState.ch.Rz(0,$.p6().p(0,a))
+a.terminate()
+init.globalState.e.bL()
+break
+case"log":H.VL(y.p(z,"msg"))
+break
+case"print":if(init.globalState.r===!0){y=init.globalState.z
+q=P.B(["command","print","msg",z],null,null)
+q=new H.jP(!0,P.Q9(null,P.KN)).a3(q)
+y.toString
+self.postMessage(q)}else P.JS(y.p(z,"msg"))
+break
+case"error":throw H.b(y.p(z,"msg"))}},
+VL:function(a){var z,y,x,w
+if(init.globalState.r===!0){y=init.globalState.z
+x=P.B(["command","log","msg",a],null,null)
+x=new H.jP(!0,P.Q9(null,P.KN)).a3(x)
+y.toString
+self.postMessage(x)}else try{self.console.log(a)}catch(w){H.Ru(w)
+z=H.ts(w)
+throw H.b(P.FM(z))}},
+Cr:function(a){return init.globalFunctions[a]()},
+Z7:function(a,b,c,d,e,f){var z,y,x,w
+z=init.globalState.c
+y=z.Q
+$.te=$.te+("_"+y)
+$.eb=$.eb+("_"+y)
+y=z.d
+x=init.globalState.c.Q
+w=z.e
+J.jV(f,["spawned",new H.JM(y,x),w,z.f])
+x=new H.vK(a,b,c,d,z)
+if(e===!0){z.v8(w,w)
+init.globalState.e.Q.B7(new H.IY(z,x,"start isolate"))}else x.$0()},
+Gx:function(a){return new H.fP(!0,[]).QS(new H.jP(!1,P.Q9(null,P.KN)).a3(a))},
+PK:{
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+$0:function(){this.a.$1(this.Q.a)}},
+JO:{
+"^":"r:0;Q,a",
+$0:function(){this.a.$2(this.Q.a,null)}},
+O2:{
+"^":"a;Q,a,b,c,d,e,f,r,x,y,z,ch,cx",
+N8:function(a){var z,y,x
+z=self.window==null
+y=self.Worker
+x=z&&!!self.postMessage
+this.r=x
+if(!x)y=y!=null&&$.Rs()!=null
+else y=!0
+this.x=y
+this.f=z&&!x
+this.e=new H.cC(P.NZ(null,H.IY),0)
+this.y=P.L5(null,null,null,P.KN,H.aX)
+this.ch=P.L5(null,null,null,P.KN,null)
+if(this.r===!0){z=new H.JH()
+this.z=z
+self.onmessage=function(b,c){return function(d){b(c,d)}}(H.Mg,z)
+self.dartPrint=self.dartPrint||function(b){return function(c){if(self.console&&self.console.log)self.console.log(c)
+else self.postMessage(b(c))}}(H.wI)}},
+static:{wI:function(a){var z=P.B(["command","print","msg",a],null,null)
+return new H.jP(!0,P.Q9(null,P.KN)).a3(z)}}},
+aX:{
+"^":"a;Q,a,b,En:c<,EE:d<,e,f,r,x,y,z,ch,cx,cy,db,dx",
+v8:function(a,b){if(!this.e.m(0,a))return
+if(this.z.h(0,b)&&!this.x)this.x=!0
+this.Wp()},
+cK:function(a){var z,y,x,w,v,u
+if(!this.x)return
+z=this.z
+z.Rz(0,a)
+if(z.Q===0){for(z=this.y;y=z.length,y!==0;){if(0>=y)return H.e(z,0)
+x=z.pop()
+y=init.globalState.e.Q
+w=y.a
+v=y.Q
+u=v.length
+w=(w-1&u-1)>>>0
+y.a=w
+if(w<0||w>=u)return H.e(v,w)
+v[w]=x
+if(w===y.b)y.wL();++y.c}this.x=!1}this.Wp()},
+Ma:function(a){var z=this.ch
+if(z==null){z=[]
+this.ch=z}if(J.kE(z,a))return
+this.ch.push(a)},
+Hh:function(a){var z=this.ch
+if(z==null)return
+J.V1(z,a)},
+MZ:function(a,b){if(!this.f.m(0,a))return
+this.db=b},
+Wq:function(a,b){var z,y
+z=J.t(b)
+if(!z.m(b,0))y=z.m(b,1)&&!this.cy
+else y=!0
+if(y){J.jV(a,null)
+return}y=new H.NY(a)
+if(z.m(b,2)){init.globalState.e.Q.B7(new H.IY(this,y,"ping"))
+return}z=this.cx
+if(z==null){z=P.NZ(null,null)
+this.cx=z}z.B7(y)},
+bc:function(a,b){var z,y
+if(!this.f.m(0,a))return
+z=J.t(b)
+if(!z.m(b,0))y=z.m(b,1)&&!this.cy
+else y=!0
+if(y){this.Dm()
+return}if(z.m(b,2)){z=init.globalState.e
+y=this.gIm()
+z.Q.B7(new H.IY(this,y,"kill"))
+return}z=this.cx
+if(z==null){z=P.NZ(null,null)
+this.cx=z}z.B7(this.gIm())},
+hk:function(a,b){var z,y
+z=this.dx
+if(z.Q===0){if(this.db===!0&&this===init.globalState.d)return
+if(self.console&&self.console.error)self.console.error(a,b)
+else{P.JS(a)
+if(b!=null)P.JS(b)}return}y=Array(2)
+y.fixed$length=Array
+y[0]=J.Lz(a)
+y[1]=b==null?null:J.Lz(b)
+for(z=H.J(new P.zQ(z,z.f,null,null),[null]),z.b=z.Q.d;z.D();)J.jV(z.c,y)},
+vV:function(a){var z,y,x,w,v,u,t
+z=init.globalState.c
+init.globalState.c=this
+$=this.c
+y=null
+x=this.cy
+this.cy=!0
+try{y=a.$0()}catch(u){t=H.Ru(u)
+w=t
+v=H.ts(u)
+this.hk(w,v)
+if(this.db===!0){this.Dm()
+if(this===init.globalState.d)throw u}}finally{this.cy=x
+init.globalState.c=z
+if(z!=null)$=z.gEn()
+if(this.cx!=null)for(;t=this.cx,!t.gl0(t);)this.cx.Ux().$0()}return y},
+Zt:function(a){return this.a.p(0,a)},
+ac:function(a,b){var z=this.a
+if(z.x4(a))throw H.b(P.FM("Registry: ports must be registered only once."))
+z.q(0,a,b)},
+Wp:function(){if(this.a.Q-this.b.Q>0||this.x||!this.r)init.globalState.y.q(0,this.Q,this)
+else this.Dm()},
+Dm:[function(){var z,y
+z=this.cx
+if(z!=null)z.V1(0)
+for(z=this.a,y=z.gUQ(z),y=H.J(new H.MH(null,J.Nx(y.Q),y.a),[H.Kp(y,0),H.Kp(y,1)]);y.D();)y.Q.pr()
+z.V1(0)
+this.b.V1(0)
+init.globalState.y.Rz(0,this.Q)
+this.dx.V1(0)
+z=this.ch
+if(z!=null){for(z=H.J(new H.a7(z,z.length,0,null),[H.Kp(z,0)]);z.D();)J.jV(z.c,null)
+this.ch=null}},"$0","gIm",0,0,1]},
+NY:{
+"^":"r:1;Q",
+$0:function(){J.jV(this.Q,null)}},
+cC:{
+"^":"a;Q,a",
+Jc:function(){var z=this.Q
+if(z.a===z.b)return
+return z.Ux()},
+xB:function(){var z,y,x
+z=this.Jc()
+if(z==null){if(init.globalState.d!=null&&init.globalState.y.x4(init.globalState.d.Q)&&init.globalState.f===!0&&init.globalState.d.a.Q===0)H.vh(P.FM("Program exited with open ReceivePorts."))
+y=init.globalState
+if(y.r===!0&&y.y.Q===0&&y.e.a===0){y=y.z
+x=P.B(["command","close"],null,null)
+x=new H.jP(!0,P.Q9(null,P.KN)).a3(x)
+y.toString
+self.postMessage(x)}return!1}z.oH()
+return!0},
+Ex:function(){if(self.window!=null)new H.RA(this).$0()
+else for(;this.xB(););},
+bL:function(){var z,y,x,w,v
+if(init.globalState.r!==!0)this.Ex()
+else try{this.Ex()}catch(x){w=H.Ru(x)
+z=w
+y=H.ts(x)
+w=init.globalState.z
+v=P.B(["command","error","msg",H.d(z)+"\n"+H.d(y)],null,null)
+v=new H.jP(!0,P.Q9(null,P.KN)).a3(v)
+w.toString
+self.postMessage(v)}}},
+RA:{
+"^":"r:1;Q",
+$0:function(){if(!this.Q.xB())return
+P.rT(C.RT,this)}},
+IY:{
+"^":"a;Q,a,G1:b>",
+oH:function(){var z=this.Q
+if(z.x){z.y.push(this)
+return}z.vV(this.a)}},
+JH:{
+"^":"a;"},
+jl:{
+"^":"r:0;Q,a,b,c,d,e",
+$0:function(){H.Z7(this.Q,this.a,this.b,this.c,this.d,this.e)}},
+vK:{
+"^":"r:1;Q,a,b,c,d",
+$0:function(){var z,y,x
+this.d.r=!0
+if(this.c!==!0)this.Q.$1(this.b)
+else{z=this.Q
+y=H.N7()
+x=H.KT(y,[y,y]).Zg(z)
+if(x)z.$2(this.a,this.b)
+else{y=H.KT(y,[y]).Zg(z)
+if(y)z.$1(this.a)
+else z.$0()}}}},
+Iy:{
+"^":"a;"},
+JM:{
+"^":"Iy;a,Q",
+wR:function(a,b){var z,y,x,w
+z=init.globalState.y.p(0,this.Q)
+if(z==null)return
+y=this.a
+if(y.gGl())return
+x=H.Gx(b)
+if(z.gEE()===y){y=J.U6(x)
+switch(y.p(x,0)){case"pause":z.v8(y.p(x,1),y.p(x,2))
+break
+case"resume":z.cK(y.p(x,1))
+break
+case"add-ondone":z.Ma(y.p(x,1))
+break
+case"remove-ondone":z.Hh(y.p(x,1))
+break
+case"set-errors-fatal":z.MZ(y.p(x,1),y.p(x,2))
+break
+case"ping":z.Wq(y.p(x,1),y.p(x,2))
+break
+case"kill":z.bc(y.p(x,1),y.p(x,2))
+break
+case"getErrors":y=y.p(x,1)
+z.dx.h(0,y)
+break
+case"stopErrors":y=y.p(x,1)
+z.dx.Rz(0,y)
+break}return}y=init.globalState.e
+w="receive "+H.d(b)
+y.Q.B7(new H.IY(z,new H.Ua(this,x),w))},
+m:function(a,b){if(b==null)return!1
+return b instanceof H.JM&&J.mG(this.a,b.a)},
+giO:function(a){return this.a.gTU()}},
+Ua:{
+"^":"r:0;Q,a",
+$0:function(){var z=this.Q.a
+if(!z.gGl())z.FL(this.a)}},
+ns:{
+"^":"Iy;a,b,Q",
+wR:function(a,b){var z,y,x
+z=P.B(["command","message","port",this,"msg",b],null,null)
+y=new H.jP(!0,P.Q9(null,P.KN)).a3(z)
+if(init.globalState.r===!0){init.globalState.z.toString
+self.postMessage(y)}else{x=init.globalState.ch.p(0,this.a)
+if(x!=null)x.postMessage(y)}},
+m:function(a,b){if(b==null)return!1
+return b instanceof H.ns&&J.mG(this.a,b.a)&&J.mG(this.Q,b.Q)&&J.mG(this.b,b.b)},
+giO:function(a){var z,y,x
+z=this.a
+if(typeof z!=="number")return z.L()
+y=this.Q
+if(typeof y!=="number")return y.L()
+x=this.b
+if(typeof x!=="number")return H.o(x)
+return(z<<16^y<<8^x)>>>0}},
+yo:{
+"^":"a;TU:Q<,a,Gl:b<",
+pr:function(){this.b=!0
+this.a=null},
+FL:function(a){if(this.b)return
+this.mY(a)},
+mY:function(a){return this.a.$1(a)},
+$isSF:1},
+yH:{
+"^":"a;Q,a,b",
+Qa:function(a,b){var z,y
+if(a===0)z=self.setTimeout==null||init.globalState.r===!0
+else z=!1
+if(z){this.b=1
+z=init.globalState.e
+y=init.globalState.c
+z.Q.B7(new H.IY(y,new H.FA(this,b),"timer"))
+this.a=!0}else if(self.setTimeout!=null){++init.globalState.e.a
+this.b=self.setTimeout(H.tR(new H.Av(this,b),0),a)}else throw H.b(P.f("Timer greater than 0."))},
+static:{cy:function(a,b){var z=new H.yH(!0,!1,null)
+z.Qa(a,b)
+return z}}},
+FA:{
+"^":"r:1;Q,a",
+$0:function(){this.Q.b=null
+this.a.$0()}},
+Av:{
+"^":"r:1;Q,a",
+$0:function(){this.Q.b=null
+H.ox()
+this.a.$0()}},
+ku:{
+"^":"a;TU:Q<",
+giO:function(a){var z=this.Q
+z=C.jn.wG(z,0)^C.jn.BU(z,4294967296)
+z=(~z>>>0)+(z<<15>>>0)&4294967295
+z=((z^z>>>12)>>>0)*5&4294967295
+z=((z^z>>>4)>>>0)*2057&4294967295
+return(z^z>>>16)>>>0},
+m:function(a,b){if(b==null)return!1
+if(b===this)return!0
+if(b instanceof H.ku)return this.Q===b.Q
+return!1}},
+jP:{
+"^":"a;Q,a",
+a3:[function(a){var z,y,x,w,v
+if(a==null||typeof a==="string"||typeof a==="number"||typeof a==="boolean")return a
+z=this.a
+y=z.p(0,a)
+if(y!=null)return["ref",y]
+z.q(0,a,z.Q)
+z=J.t(a)
+if(!!z.$isWZ)return["buffer",a]
+if(!!z.$isET)return["typed",a]
+if(!!z.$isDD)return this.BE(a)
+if(!!z.$isym){x=this.gpC()
+w=a.gvc()
+w=H.K1(w,x,H.W8(w,"mW",0),null)
+w=P.z(w,!0,H.W8(w,"mW",0))
+z=z.gUQ(a)
+z=H.K1(z,x,H.W8(z,"mW",0),null)
+return["map",w,P.z(z,!0,H.W8(z,"mW",0))]}if(!!z.$isvm)return this.OD(a)
+if(!!z.$isGv)this.jf(a)
+if(!!z.$isSF)this.kz(a,"RawReceivePorts can't be transmitted:")
+if(!!z.$isJM)return this.PE(a)
+if(!!z.$isns)return this.ff(a)
+if(!!z.$isr){v=a.$name
+if(v==null)this.kz(a,"Closures can't be transmitted:")
+return["function",v]}return["dart",init.classIdExtractor(a),this.jG(init.classFieldsExtractor(a))]},"$1","gpC",2,0,2],
+kz:function(a,b){throw H.b(P.f(H.d(b==null?"Can't transmit:":b)+" "+H.d(a)))},
+jf:function(a){return this.kz(a,null)},
+BE:function(a){var z=this.dY(a)
+if(!!a.fixed$length)return["fixed",z]
+if(!a.fixed$length)return["extendable",z]
+if(!a.immutable$list)return["mutable",z]
+if(a.constructor===Array)return["const",z]
+this.kz(a,"Can't serialize indexable: ")},
+dY:function(a){var z,y,x
+z=[]
+C.Nm.sv(z,a.length)
+for(y=0;y<a.length;++y){x=this.a3(a[y])
+if(y>=z.length)return H.e(z,y)
+z[y]=x}return z},
+jG:function(a){var z
+for(z=0;z<a.length;++z)C.Nm.q(a,z,this.a3(a[z]))
+return a},
+OD:function(a){var z,y,x,w
+if(!!a.constructor&&a.constructor!==Object)this.kz(a,"Only plain JS Objects are supported:")
+z=Object.keys(a)
+y=[]
+C.Nm.sv(y,z.length)
+for(x=0;x<z.length;++x){w=this.a3(a[z[x]])
+if(x>=y.length)return H.e(y,x)
+y[x]=w}return["js-object",z,y]},
+ff:function(a){if(this.Q)return["sendport",a.a,a.Q,a.b]
+return["raw sendport",a]},
+PE:function(a){if(this.Q)return["sendport",init.globalState.a,a.Q,a.a.gTU()]
+return["raw sendport",a]}},
+fP:{
+"^":"a;Q,a",
+QS:[function(a){var z,y,x,w,v,u
+if(a==null||typeof a==="string"||typeof a==="number"||typeof a==="boolean")return a
+if(typeof a!=="object"||a===null||a.constructor!==Array)throw H.b(P.p("Bad serialized message: "+H.d(a)))
+switch(C.Nm.gFV(a)){case"ref":if(1>=a.length)return H.e(a,1)
+z=a[1]
+y=this.a
+if(z>>>0!==z||z>=y.length)return H.e(y,z)
+return y[z]
+case"buffer":if(1>=a.length)return H.e(a,1)
+x=a[1]
+this.a.push(x)
+return x
+case"typed":if(1>=a.length)return H.e(a,1)
+x=a[1]
+this.a.push(x)
+return x
+case"fixed":if(1>=a.length)return H.e(a,1)
+x=a[1]
+this.a.push(x)
+y=this.NB(x)
+y.$builtinTypeInfo=[null]
+y.fixed$length=Array
+return y
+case"extendable":if(1>=a.length)return H.e(a,1)
+x=a[1]
+this.a.push(x)
+y=this.NB(x)
+y.$builtinTypeInfo=[null]
+return y
+case"mutable":if(1>=a.length)return H.e(a,1)
+x=a[1]
+this.a.push(x)
+return this.NB(x)
+case"const":if(1>=a.length)return H.e(a,1)
+x=a[1]
+this.a.push(x)
+y=this.NB(x)
+y.$builtinTypeInfo=[null]
+y.fixed$length=Array
+return y
+case"map":return this.di(a)
+case"sendport":return this.Vf(a)
+case"raw sendport":if(1>=a.length)return H.e(a,1)
+x=a[1]
+this.a.push(x)
+return x
+case"js-object":return this.ZQ(a)
+case"function":if(1>=a.length)return H.e(a,1)
+x=init.globalFunctions[a[1]]()
+this.a.push(x)
+return x
+case"dart":y=a.length
+if(1>=y)return H.e(a,1)
+w=a[1]
+if(2>=y)return H.e(a,2)
+v=a[2]
+u=init.instanceFromClassId(w)
+this.a.push(u)
+this.NB(v)
+return init.initializeEmptyInstance(w,u,v)
+default:throw H.b("couldn't deserialize: "+H.d(a))}},"$1","gia",2,0,2],
+NB:function(a){var z,y,x
+z=J.U6(a)
+y=0
+while(!0){x=z.gv(a)
+if(typeof x!=="number")return H.o(x)
+if(!(y<x))break
+z.q(a,y,this.QS(z.p(a,y)));++y}return a},
+di:function(a){var z,y,x,w,v,u
+z=a.length
+if(1>=z)return H.e(a,1)
+y=a[1]
+if(2>=z)return H.e(a,2)
+x=a[2]
+w=P.A(null,null)
+this.a.push(w)
+y=J.kl(y,this.gia()).br(0)
+for(z=J.U6(y),v=J.U6(x),u=0;u<z.gv(y);++u){if(u>=y.length)return H.e(y,u)
+w.q(0,y[u],this.QS(v.p(x,u)))}return w},
+Vf:function(a){var z,y,x,w,v,u,t
+z=a.length
+if(1>=z)return H.e(a,1)
+y=a[1]
+if(2>=z)return H.e(a,2)
+x=a[2]
+if(3>=z)return H.e(a,3)
+w=a[3]
+if(J.mG(y,init.globalState.a)){v=init.globalState.y.p(0,x)
+if(v==null)return
+u=v.Zt(w)
+if(u==null)return
+t=new H.JM(u,x)}else t=new H.ns(y,w,x)
+this.a.push(t)
+return t},
+ZQ:function(a){var z,y,x,w,v,u,t
+z=a.length
+if(1>=z)return H.e(a,1)
+y=a[1]
+if(2>=z)return H.e(a,2)
+x=a[2]
+w={}
+this.a.push(w)
+z=J.U6(y)
+v=J.U6(x)
+u=0
+while(!0){t=z.gv(y)
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+init.getTypeFromName=function(a){return init.allClasses[a]}
+init.interceptorsByTag=Object.create(null)
+init.leafTags=Object.create(null)
+init.finishedClasses=Object.create(null)
+I.$lazy=function(a,b,c,d,e){if(!init.lazies)init.lazies=Object.create(null)
+init.lazies[c]=d
+var z={}
+var y={}
+a[c]=z
+a[d]=function(){var x=$[c]
+try{if(x===z){$[c]=y
+try{x=$[c]=e()}finally{if(x===z)$[c]=null}}else if(x===y)H.ag(b)
+return x}finally{$[d]=function(){return this[c]}}}}
+I.$finishIsolateConstructor=function(a){var z=a.p
+function Isolate(){var y=Object.keys(z)
+for(var x=0;x<y.length;x++){var w=y[x]
+this[w]=z[w]}var v=init.lazies
+var u=v?Object.keys(v):[]
+for(var x=0;x<u.length;x++)this[v[u[x]]]=null
+function ForceEfficientMap(){}ForceEfficientMap.prototype=this
+new ForceEfficientMap()
+for(var x=0;x<u.length;x++){var t=v[u[x]]
+this[t]=z[t]}}Isolate.prototype=a.prototype
+Isolate.prototype.constructor=Isolate
+Isolate.p=z
+Isolate.uL=a.uL
+return Isolate}}
+!function(){function intern(a){var u={}
+u[a]=1
+return Object.keys(convertToFastObject(u))[0]}init.getIsolateTag=function(a){return intern("___dart_"+a+init.isolateTag)}
+var z="___dart_isolate_tags_"
+var y=Object[z]||(Object[z]=Object.create(null))
+var x="_ZxYxX"
+for(var w=0;;w++){var v=intern(x+"_"+w+"_")
+if(!(v in y)){y[v]=1
+init.isolateTag=v
+break}}init.dispatchPropertyName=init.getIsolateTag("dispatch_record")}();(function(a){if(typeof document==="undefined"){a(null)
+return}if(document.currentScript){a(document.currentScript)
+return}var z=document.scripts
+function onLoad(b){for(var x=0;x<z.length;++x)z[x].removeEventListener("load",onLoad,false)
+a(b.target)}for(var y=0;y<z.length;++y)z[y].addEventListener("load",onLoad,false)})(function(a){init.currentScript=a
+if(typeof dartMainRunner==="function")dartMainRunner(function(b){H.Rq(F.f8(),b)},[])
+else (function(b){H.Rq(F.f8(),b)})([])})
+})()
diff --git a/pkg/dev_compiler/test/codegen/expect/server_mode/dir/html_input_a.js b/pkg/dev_compiler/test/codegen/expect/server_mode/dir/html_input_a.js
new file mode 100644
index 000000000000..d78eb67030a9
--- /dev/null
+++ b/pkg/dev_compiler/test/codegen/expect/server_mode/dir/html_input_a.js
@@ -0,0 +1,11 @@
+var html_input_a;
+(function(exports) {
+  'use strict';
+  // Function main: () → dynamic
+  function main() {
+    core.print(`fib(${html_input_b.x} + ${html_input_c.y}) = `);
+    core.print(`  ... ${html_input_d.fib(dart.notNull(html_input_b.x) + dart.notNull(html_input_c.y))}`);
+  }
+  // Exports:
+  exports.main = main;
+})(html_input_a || (html_input_a = {}));
diff --git a/pkg/dev_compiler/test/codegen/expect/server_mode/dir/html_input_b.js b/pkg/dev_compiler/test/codegen/expect/server_mode/dir/html_input_b.js
new file mode 100644
index 000000000000..5d2efcd8cf83
--- /dev/null
+++ b/pkg/dev_compiler/test/codegen/expect/server_mode/dir/html_input_b.js
@@ -0,0 +1,5 @@
+var html_input_b;
+(function(exports) {
+  'use strict';
+  exports.x = 3;
+})(html_input_b || (html_input_b = {}));
diff --git a/pkg/dev_compiler/test/codegen/expect/server_mode/dir/html_input_c.js b/pkg/dev_compiler/test/codegen/expect/server_mode/dir/html_input_c.js
new file mode 100644
index 000000000000..5dc4609ebb2f
--- /dev/null
+++ b/pkg/dev_compiler/test/codegen/expect/server_mode/dir/html_input_c.js
@@ -0,0 +1,10 @@
+var html_input_c;
+(function(exports) {
+  'use strict';
+  dart.defineLazyProperties(exports, {
+    get y() {
+      return 3 + dart.notNull(html_input_e.w);
+    },
+    set y(_) {}
+  });
+})(html_input_c || (html_input_c = {}));
diff --git a/pkg/dev_compiler/test/codegen/expect/server_mode/dir/html_input_d.js b/pkg/dev_compiler/test/codegen/expect/server_mode/dir/html_input_d.js
new file mode 100644
index 000000000000..cecfc8fb81b4
--- /dev/null
+++ b/pkg/dev_compiler/test/codegen/expect/server_mode/dir/html_input_d.js
@@ -0,0 +1,10 @@
+var html_input_d;
+(function(exports) {
+  'use strict';
+  // Function fib: (int) → int
+  function fib(n) {
+    return n === 0 || n === 1 ? 1 : dart.notNull(fib(dart.notNull(n) - 1)) + dart.notNull(fib(dart.notNull(n) - 2));
+  }
+  // Exports:
+  exports.fib = fib;
+})(html_input_d || (html_input_d = {}));
diff --git a/pkg/dev_compiler/test/codegen/expect/server_mode/dir/html_input_e.js b/pkg/dev_compiler/test/codegen/expect/server_mode/dir/html_input_e.js
new file mode 100644
index 000000000000..1824c522a1f9
--- /dev/null
+++ b/pkg/dev_compiler/test/codegen/expect/server_mode/dir/html_input_e.js
@@ -0,0 +1,5 @@
+var html_input_e;
+(function(exports) {
+  'use strict';
+  exports.w = 9;
+})(html_input_e || (html_input_e = {}));
diff --git a/pkg/dev_compiler/test/codegen/expect/server_mode/html_input.html b/pkg/dev_compiler/test/codegen/expect/server_mode/html_input.html
new file mode 100644
index 000000000000..94d52cf94748
--- /dev/null
+++ b/pkg/dev_compiler/test/codegen/expect/server_mode/html_input.html
@@ -0,0 +1,19 @@
+<html><head></head><body>
+<script src="cached/c947f9f732203b97dd2882e63da78dbe/dev_compiler/runtime/harmony_feature_check.js"></script>
+<script src="cached/e0c88ce05fb3615397b4fd408c68cf8a/dev_compiler/runtime/dart_runtime.js"></script>
+<script src="cached/fa4d5796ad409e1bbdbd3c64354488c4/dev_compiler/runtime/messages_widget.js"></script>
+<link rel="stylesheet" href="cached/307a7ef1e0cd0544d55c6f768f5e3886/dev_compiler/runtime/messages.css">
+<script>
+  /* placehorder for unimplemented code libraries */
+  var math = Math;
+  var core = { int: { parse: Number }, print: e => console.log(e) };
+  var dom = { document: document };
+</script><script src="cached/e0fe26da0f62b92461fd9b150facff7e/dir/html_input_d.js"></script>
+<script src="cached/fa9de9a33d7351e5d3e8cc73cf72dc6c/dir/html_input_b.js"></script>
+<script src="cached/2df704f47bff6d0c0c7056a29f2df0af/dir/html_input_e.js"></script>
+<script src="cached/23292ca0509f6bfd409afc158b5eeae2/dir/html_input_c.js"></script>
+<script src="cached/af96cf335000b6882f811a6008fb051f/dir/html_input_a.js"></script>
+<script>html_input_a.main();</script>
+
+
+</body></html>
diff --git a/pkg/dev_compiler/test/codegen/expect/server_mode/html_input.txt b/pkg/dev_compiler/test/codegen/expect/server_mode/html_input.txt
new file mode 100644
index 000000000000..6552e292f7b4
--- /dev/null
+++ b/pkg/dev_compiler/test/codegen/expect/server_mode/html_input.txt
@@ -0,0 +1 @@
+// Messages from compiling html_input.html
diff --git a/pkg/dev_compiler/test/codegen_test.dart b/pkg/dev_compiler/test/codegen_test.dart
index ee89b60e199b..e80dcbdc5b23 100644
--- a/pkg/dev_compiler/test/codegen_test.dart
+++ b/pkg/dev_compiler/test/codegen_test.dart
@@ -21,8 +21,8 @@ import 'package:unittest/unittest.dart';
 
 final ArgParser argParser = new ArgParser()
   ..addOption('dart-sdk', help: 'Dart SDK Path', defaultsTo: null)
-  ..addFlag(
-      'dart-gen', abbr: 'd', help: 'Generate dart output', defaultsTo: false);
+  ..addFlag('dart-gen',
+      abbr: 'd', help: 'Generate dart output', defaultsTo: false);
 
 main(arguments) {
   if (arguments == null) arguments = [];
@@ -56,9 +56,10 @@ main(arguments) {
       .map((f) => f.path)
       .where((p) => p.endsWith('.dart') && filePattern.hasMatch(p));
 
-  compile(String entryPoint, String sdkPath, [bool checkSdk = false]) {
+  compile(String entryPoint, String sdkPath,
+      {bool checkSdk: false, bool serverMode: false}) {
     var options = new CompilerOptions(
-        outputDir: actualDir,
+        outputDir: serverMode ? path.join(actualDir, 'server_mode') : actualDir,
         useColors: false,
         outputDart: dartGen,
         formatOutput: dartGen,
@@ -67,7 +68,8 @@ main(arguments) {
         cheapTestFormat: checkSdk,
         checkSdk: checkSdk,
         entryPointFile: entryPoint,
-        dartSdkPath: sdkPath);
+        dartSdkPath: sdkPath,
+        serverMode: serverMode);
     return new Compiler(options).run();
   }
   var realSdk = getSdkDir(arguments).path;
@@ -127,7 +129,7 @@ main(arguments) {
       var testSdk = dartGen
           ? path.join(testDir, '..', 'tool', 'input_sdk')
           : path.join(testDir, 'generated_sdk');
-      var result = compile('dart:core', testSdk, true);
+      var result = compile('dart:core', testSdk, checkSdk: true);
       var outputDir = new Directory(path.join(actualDir, 'core'));
       var outFile = dartGen
           ? new File(path.join(actualDir, 'core/core'))
@@ -153,6 +155,23 @@ main(arguments) {
       expect(outFile.existsSync(), success,
           reason: '${outFile.path} was created iff compilation succeeds');
     });
+
+    test('devc jscodegen html_input.html server mode', () {
+      var filePath = path.join(inputDir, 'html_input.html');
+      compilerMessages.writeln('// Messages from compiling html_input.html');
+
+      var result = compile(filePath, realSdk, serverMode: true);
+      var success = !result.failure;
+
+      // Write compiler messages to disk.
+      new File(path.join(actualDir, 'server_mode', 'html_input.txt'))
+          .writeAsStringSync(compilerMessages.toString());
+
+      var outFile =
+          new File(path.join(actualDir, 'server_mode', 'html_input.html'));
+      expect(outFile.existsSync(), success,
+          reason: '${outFile.path} was created iff compilation succeeds');
+    });
   }
 }
 
diff --git a/pkg/dev_compiler/test/dependency_graph_test.dart b/pkg/dev_compiler/test/dependency_graph_test.dart
index d52f9db79f54..c34dd450cfa4 100644
--- a/pkg/dev_compiler/test/dependency_graph_test.dart
+++ b/pkg/dev_compiler/test/dependency_graph_test.dart
@@ -64,7 +64,7 @@ main() {
     testUriResolver = new TestUriResolver(testFiles);
     context = new TypeResolver.fromMock(mockSdkSources, options,
         otherResolvers: [testUriResolver]).context;
-    graph = new SourceGraph(context, new LogReporter());
+    graph = new SourceGraph(context, new LogReporter(), options);
   });
 
   group('HTML deps', () {
@@ -553,10 +553,8 @@ main() {
       var node = nodeOf('/index3.html');
       expectGraph(node, '''
           index3.html
-          |-- dart_runtime.js
           |-- harmony_feature_check.js
-          |-- messages_widget.js
-          |-- messages.css
+          |-- dart_runtime.js
           ''');
       refreshStructureAndMarks(node, graph);
       expectGraph(node, '''
@@ -567,10 +565,8 @@ main() {
           |    |    |-- a10.dart [needs-rebuild]
           |    |-- a5.dart [needs-rebuild]
           |    |-- a6.dart (part) [needs-rebuild]
-          |-- dart_runtime.js [needs-rebuild]
           |-- harmony_feature_check.js [needs-rebuild]
-          |-- messages_widget.js [needs-rebuild]
-          |-- messages.css [needs-rebuild]
+          |-- dart_runtime.js [needs-rebuild]
           ''');
     });
 
@@ -585,10 +581,8 @@ main() {
           |    |    |-- a10.dart [needs-rebuild]
           |    |-- a5.dart [needs-rebuild]
           |    |-- a6.dart (part) [needs-rebuild]
-          |-- dart_runtime.js [needs-rebuild]
           |-- harmony_feature_check.js [needs-rebuild]
-          |-- messages_widget.js [needs-rebuild]
-          |-- messages.css [needs-rebuild]
+          |-- dart_runtime.js [needs-rebuild]
           ''');
       clearMarks(node);
       expectGraph(node, '''
@@ -599,10 +593,8 @@ main() {
           |    |    |-- a10.dart
           |    |-- a5.dart
           |    |-- a6.dart (part)
-          |-- dart_runtime.js
           |-- harmony_feature_check.js
-          |-- messages_widget.js
-          |-- messages.css
+          |-- dart_runtime.js
           ''');
 
       refreshStructureAndMarks(node, graph);
@@ -614,10 +606,8 @@ main() {
           |    |    |-- a10.dart
           |    |-- a5.dart
           |    |-- a6.dart (part)
-          |-- dart_runtime.js
           |-- harmony_feature_check.js
-          |-- messages_widget.js
-          |-- messages.css
+          |-- dart_runtime.js
           ''');
     });
 
@@ -637,10 +627,8 @@ main() {
           |    |    |-- a10.dart
           |    |-- a5.dart
           |    |-- a6.dart (part)
-          |-- dart_runtime.js
           |-- harmony_feature_check.js
-          |-- messages_widget.js
-          |-- messages.css
+          |-- dart_runtime.js
           ''');
     });
 
@@ -663,11 +651,43 @@ main() {
           |    |    |-- a8.dart [needs-rebuild] [structure-changed]
           |    |    |    |-- a8.dart...
           |    |-- a6.dart (part)
+          |-- harmony_feature_check.js
           |-- dart_runtime.js
+          ''');
+    });
+  });
+
+  group('server-mode', () {
+    setUp(() {
+      var options2 = new CompilerOptions(serverMode: true);
+      context = new TypeResolver.fromMock(mockSdkSources, options2,
+          otherResolvers: [testUriResolver]).context;
+      graph = new SourceGraph(context, new LogReporter(), options2);
+    });
+
+    test('messages widget is automatically included', () {
+      var node = nodeOf('/index3.html');
+      expectGraph(node, '''
+          index3.html
           |-- harmony_feature_check.js
+          |-- dart_runtime.js
           |-- messages_widget.js
           |-- messages.css
           ''');
+      refreshStructureAndMarks(node, graph);
+      expectGraph(node, '''
+          index3.html [needs-rebuild] [structure-changed]
+          |-- a2.dart [needs-rebuild] [structure-changed]
+          |    |-- a3.dart [needs-rebuild]
+          |    |-- a4.dart [needs-rebuild] [structure-changed]
+          |    |    |-- a10.dart [needs-rebuild]
+          |    |-- a5.dart [needs-rebuild]
+          |    |-- a6.dart (part) [needs-rebuild]
+          |-- harmony_feature_check.js [needs-rebuild]
+          |-- dart_runtime.js [needs-rebuild]
+          |-- messages_widget.js [needs-rebuild]
+          |-- messages.css [needs-rebuild]
+          ''');
     });
   });
 
@@ -699,10 +719,8 @@ main() {
         'a4.dart',
         'a5.dart',
         'a2.dart',
-        'dart_runtime.js',
         'harmony_feature_check.js',
-        'messages_widget.js',
-        'messages.css',
+        'dart_runtime.js',
         'index3.html',
       ]);
 
@@ -715,10 +733,8 @@ main() {
           |    |    |-- a10.dart
           |    |-- a5.dart
           |    |-- a6.dart (part)
-          |-- dart_runtime.js
           |-- harmony_feature_check.js
-          |-- messages_widget.js
-          |-- messages.css
+          |-- dart_runtime.js
           ''');
     });
 
@@ -869,10 +885,8 @@ main() {
             |    |    |-- a10.dart
             |    |-- a5.dart
             |    |-- a6.dart (part)
-            |-- dart_runtime.js
             |-- harmony_feature_check.js
-            |-- messages_widget.js
-            |-- messages.css
+            |-- dart_runtime.js
             ''');
 
         // Modify the file first:
@@ -893,10 +907,8 @@ main() {
             |    |    |-- a10.dart
             |    |-- a5.dart
             |    |-- a6.dart (part)
-            |-- dart_runtime.js
             |-- harmony_feature_check.js
-            |-- messages_widget.js
-            |-- messages.css
+            |-- dart_runtime.js
             ''');
 
         a2.source.contents.modificationTime++;
@@ -927,10 +939,8 @@ main() {
             |    |-- a6.dart
             |    |    |-- a5.dart
             |    |-- a5.dart...
-            |-- dart_runtime.js
             |-- harmony_feature_check.js
-            |-- messages_widget.js
-            |-- messages.css
+            |-- dart_runtime.js
             ''');
       });
 
@@ -948,10 +958,8 @@ main() {
             |    |    |-- a10.dart
             |    |-- a5.dart
             |    |-- a6.dart (part)
-            |-- dart_runtime.js
             |-- harmony_feature_check.js
-            |-- messages_widget.js
-            |-- messages.css
+            |-- dart_runtime.js
             ''');
 
         a2.source.contents.modificationTime++;
@@ -973,10 +981,8 @@ main() {
             |    |    |-- a10.dart
             |    |-- a6.dart
             |    |-- a5.dart
-            |-- dart_runtime.js
             |-- harmony_feature_check.js
-            |-- messages_widget.js
-            |-- messages.css
+            |-- dart_runtime.js
             ''');
 
         a6.source.contents.modificationTime++;
@@ -993,10 +999,8 @@ main() {
             |    |-- a6.dart
             |    |    |-- a5.dart
             |    |-- a5.dart...
-            |-- dart_runtime.js
             |-- harmony_feature_check.js
-            |-- messages_widget.js
-            |-- messages.css
+            |-- dart_runtime.js
             ''');
       });
 
@@ -1014,10 +1018,8 @@ main() {
             |    |    |-- a10.dart
             |    |-- a5.dart
             |    |-- a6.dart (part)
-            |-- dart_runtime.js
             |-- harmony_feature_check.js
-            |-- messages_widget.js
-            |-- messages.css
+            |-- dart_runtime.js
             ''');
 
         a2.source.contents.modificationTime++;
@@ -1040,10 +1042,8 @@ main() {
             |    |-- a4.dart
             |    |    |-- a10.dart
             |    |-- a5.dart
-            |-- dart_runtime.js
             |-- harmony_feature_check.js
-            |-- messages_widget.js
-            |-- messages.css
+            |-- dart_runtime.js
             ''');
       });
 
@@ -1061,10 +1061,8 @@ main() {
             |    |    |-- a10.dart
             |    |-- a5.dart
             |    |-- a6.dart (part)
-            |-- dart_runtime.js
             |-- harmony_feature_check.js
-            |-- messages_widget.js
-            |-- messages.css
+            |-- dart_runtime.js
             ''');
 
         a2.source.contents.modificationTime++;
@@ -1086,10 +1084,8 @@ main() {
             |    |    |-- a10.dart
             |    |-- a5.dart (part)
             |    |-- a6.dart (part)
-            |-- dart_runtime.js
             |-- harmony_feature_check.js
-            |-- messages_widget.js
-            |-- messages.css
+            |-- dart_runtime.js
             ''');
 
         a5.source.contents.modificationTime++;
@@ -1105,10 +1101,8 @@ main() {
             |    |    |-- a10.dart
             |    |-- a5.dart (part)
             |    |-- a6.dart (part)
-            |-- dart_runtime.js
             |-- harmony_feature_check.js
-            |-- messages_widget.js
-            |-- messages.css
+            |-- dart_runtime.js
             ''');
       });
     });