diff --git a/README.md b/README.md
index bb4bc448..7bd5ea4f 100644
--- a/README.md
+++ b/README.md
@@ -87,7 +87,7 @@ JavaScriptTraining リポジトリを fork します。
 なお、トレーニング中はこのコマンドを  
 終了しないでください。
 
-	npm run serve
+	npm start
 
 
 
diff --git a/gulp/serve.js b/gulp/serve.js
index cc532f28..0f8bf2cc 100644
--- a/gulp/serve.js
+++ b/gulp/serve.js
@@ -46,6 +46,6 @@ var serve = function() {
 };
 
 
-serve.PORT = 8000;
+serve.PORT = process.env.PORT || 8000;
 
 module.exports = serve;
diff --git a/package.json b/package.json
index e75d2089..0fa65628 100644
--- a/package.json
+++ b/package.json
@@ -6,7 +6,7 @@
   "scripts": {
     "postinstall": "bower install",
     "help": "gulp help",
-    "serve": "gulp serve",
+    "start": "gulp serve",
     "presentation": "reveal-md README.md --theme solarized --separator '^\\n\\n\\n' --verticalSeparator '^\\n\\n'",
     "lint-stage-1": "gulp lint-stage-1",
     "lint-stage-2": "gulp lint-stage-2",
diff --git a/public/stage1/analytics.js b/public/stage1/analytics.js
index d2e4b2d1..1a139d43 100644
--- a/public/stage1/analytics.js
+++ b/public/stage1/analytics.js
@@ -11,11 +11,11 @@
 
     style.position = 'absolute';
     style.fontSize = '100px';
-    style.webkitAnimationName = 'moveHorizontal';
-    style.webkitAnimationDuration = '1s';
-    style.webkitAnimationIterationCount = 'infinite';
-    style.webkitAnimationDirection = 'alternate-reverse';
-    style.webkitAnimationFillMode = 'forwards';
+    style.animationName = 'moveHorizontal';
+    style.animationDuration = '1s';
+    style.animationIterationCount = 'infinite';
+    style.animationDirection = 'alternate-reverse';
+    style.animationFillMode = 'forwards';
   };
 
   var XFlyingSushiMonster = document.registerElement('x-flying-sushi-monster', {
diff --git a/public/stage4/tests.js b/public/stage4/tests.js
index 599536b6..848bc074 100644
--- a/public/stage4/tests.js
+++ b/public/stage4/tests.js
@@ -103,8 +103,7 @@ describe('ステージ4（意図通りにイベントを利用できる）', fun
 
 function createClickEvent() {
   var event = document.createEvent('MouseEvents');
-  event.initMouseEvent('click', true, true, window,
-                       0, 0, 0, 80, 20, false, false, false, false, 0, null);
+  event.initEvent('click', false, true);
   return event;
 }