diff --git a/platform/platform-resources/src/META-INF/XmlPlugin.xml b/platform/platform-resources/src/META-INF/XmlPlugin.xml
index 87eed975a9bc..dbd7e8ffd2cd 100644
--- a/platform/platform-resources/src/META-INF/XmlPlugin.xml
+++ b/platform/platform-resources/src/META-INF/XmlPlugin.xml
@@ -21,6 +21,11 @@
 
   <extensionPoints>
 
+    <!-- EP to block language injection into script tag-->
+    <extensionPoint name="html.htmlScriptInjectionBlocker" beanClass="com.intellij.lang.LanguageExtensionPoint">
+      <with attribute="implementationClass" implements="com.intellij.psi.impl.source.html.HtmlScriptInjectionBlocker"/>
+    </extensionPoint>
+
     <extensionPoint name="xml.startTagEndToken"
                     interface="com.intellij.psi.xml.StartTagEndTokenProvider"/>
     <extensionPoint name="xml.schemaProvider"
diff --git a/python/testSrc/com/jetbrains/python/fixtures/PyTestCase.java b/python/testSrc/com/jetbrains/python/fixtures/PyTestCase.java
index a44ed7a65d8a..0e6c77e4f6f2 100644
--- a/python/testSrc/com/jetbrains/python/fixtures/PyTestCase.java
+++ b/python/testSrc/com/jetbrains/python/fixtures/PyTestCase.java
@@ -30,16 +30,19 @@ import com.intellij.openapi.actionSystem.DataContext;
 import com.intellij.openapi.actionSystem.IdeActions;
 import com.intellij.openapi.application.ApplicationManager;
 import com.intellij.openapi.command.CommandProcessor;
+import com.intellij.openapi.command.WriteCommandAction;
 import com.intellij.openapi.editor.Editor;
 import com.intellij.openapi.editor.ex.EditorEx;
 import com.intellij.openapi.extensions.Extensions;
 import com.intellij.openapi.module.Module;
 import com.intellij.openapi.roots.impl.FilePropertyPusher;
 import com.intellij.openapi.util.Ref;
+import com.intellij.openapi.util.TextRange;
 import com.intellij.openapi.vfs.LocalFileSystem;
 import com.intellij.openapi.vfs.VirtualFile;
 import com.intellij.platform.DirectoryProjectConfigurator;
 import com.intellij.psi.*;
+import com.intellij.psi.codeStyle.CodeStyleManager;
 import com.intellij.psi.search.searches.ReferencesSearch;
 import com.intellij.refactoring.RefactoringActionHandler;
 import com.intellij.testFramework.LightProjectDescriptor;
@@ -55,6 +58,7 @@ import com.intellij.usageView.UsageInfo;
 import com.intellij.usages.Usage;
 import com.intellij.usages.rules.PsiElementUsage;
 import com.intellij.util.CommonProcessors.CollectProcessor;
+import com.intellij.util.IncorrectOperationException;
 import com.jetbrains.python.PythonHelpersLocator;
 import com.jetbrains.python.PythonTestUtil;
 import com.jetbrains.python.psi.LanguageLevel;
@@ -94,6 +98,24 @@ public abstract class PyTestCase extends UsefulTestCase {
     return null;
   }
 
+  /**
+   * Reformats currently configured file.
+   */
+  protected final void reformatFile() {
+    WriteCommandAction.runWriteCommandAction(null, new Runnable() {
+      @Override
+      public void run() {
+        doPerformFormatting();
+      }
+    });
+  }
+
+  private void doPerformFormatting() throws IncorrectOperationException {
+    final PsiFile file = myFixture.getFile();
+    final TextRange myTextRange = file.getTextRange();
+    CodeStyleManager.getInstance(myFixture.getProject()).reformatText(file, myTextRange.getStartOffset(), myTextRange.getEndOffset());
+  }
+
   @Override
   protected void setUp() throws Exception {
     super.setUp();
diff --git a/xml/impl/src/com/intellij/psi/impl/source/html/HtmlScriptInjectionBlocker.java b/xml/impl/src/com/intellij/psi/impl/source/html/HtmlScriptInjectionBlocker.java
new file mode 100644
index 000000000000..dab20cf50e1e
--- /dev/null
+++ b/xml/impl/src/com/intellij/psi/impl/source/html/HtmlScriptInjectionBlocker.java
@@ -0,0 +1,34 @@
+/*
+ * Copyright 2000-2015 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.intellij.psi.impl.source.html;
+
+import com.intellij.lang.Language;
+import com.intellij.psi.xml.XmlTag;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Interface to be implemented by extension point that wants to prevent some language from injection into script HTML tag
+ *
+ * @author Ilya.Kazakevich
+ */
+public interface HtmlScriptInjectionBlocker {
+  /**
+   * @param scriptTag &lt;script&gt; tag
+   * @param language  language that should be injected according to <pre>type</pre> attribute
+   * @return true if language <strong>should not</strong> be injected
+   */
+  boolean isLanguageInjectionDenied(@NotNull XmlTag scriptTag, @NotNull Language language);
+}
diff --git a/xml/impl/src/com/intellij/psi/impl/source/html/HtmlScriptInjectionBlockerExtension.java b/xml/impl/src/com/intellij/psi/impl/source/html/HtmlScriptInjectionBlockerExtension.java
new file mode 100644
index 000000000000..1a99a5845489
--- /dev/null
+++ b/xml/impl/src/com/intellij/psi/impl/source/html/HtmlScriptInjectionBlockerExtension.java
@@ -0,0 +1,62 @@
+/*
+ * Copyright 2000-2015 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.intellij.psi.impl.source.html;
+
+import com.intellij.lang.Language;
+import com.intellij.lang.LanguageExtension;
+import com.intellij.psi.xml.XmlTag;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.Collection;
+
+/**
+ * Language extension to block script injection into HTML tag &lt;script&gt; when this language exists on file's
+ * {@link com.intellij.psi.FileViewProvider}.
+ *
+ * @author Ilya.Kazakevich
+ */
+public final class HtmlScriptInjectionBlockerExtension extends LanguageExtension<HtmlScriptInjectionBlocker> {
+  private static final HtmlScriptInjectionBlockerExtension INSTANCE = new HtmlScriptInjectionBlockerExtension();
+
+  private HtmlScriptInjectionBlockerExtension() {
+    super("com.intellij.html.htmlScriptInjectionBlocker");
+  }
+
+
+  /**
+   * Checks if language injection to this tag is explicitly denied by one or more @link HtmlScriptInjectionBlocker extension points}
+   *
+   * @param xmlTag   &lt;script&gt; tag
+   * @param language lang user wants to inject (probably obtained via {@link HtmlScriptLanguageInjector}
+   * @return true if injection denied by extension point
+   */
+
+  public static boolean isInjectionBlocked(@NotNull XmlTag xmlTag, @NotNull Language language) {
+
+    Collection<Language> allFileLanguages = xmlTag.getContainingFile().getViewProvider().getLanguages();
+
+    for (Language fileLanguage : allFileLanguages) {
+      for (HtmlScriptInjectionBlocker blocker : INSTANCE.allForLanguage(fileLanguage)) {
+        if (blocker.isLanguageInjectionDenied(xmlTag, language)) {
+          // Language exists, but denied by EP
+          return true;
+        }
+      }
+    }
+    // Language exists and not denied
+    return false;
+  }
+}
diff --git a/xml/impl/src/com/intellij/psi/impl/source/html/HtmlScriptLanguageInjector.java b/xml/impl/src/com/intellij/psi/impl/source/html/HtmlScriptLanguageInjector.java
index d874118395b1..701046da40c3 100644
--- a/xml/impl/src/com/intellij/psi/impl/source/html/HtmlScriptLanguageInjector.java
+++ b/xml/impl/src/com/intellij/psi/impl/source/html/HtmlScriptLanguageInjector.java
@@ -17,7 +17,6 @@ package com.intellij.psi.impl.source.html;
 
 import com.intellij.lang.Language;
 import com.intellij.lang.LanguageUtil;
-import com.intellij.lang.StdLanguages;
 import com.intellij.lang.injection.MultiHostInjector;
 import com.intellij.lang.injection.MultiHostRegistrar;
 import com.intellij.openapi.util.TextRange;
@@ -27,24 +26,47 @@ import com.intellij.psi.xml.XmlTag;
 import com.intellij.psi.xml.XmlText;
 import com.intellij.xml.util.HtmlUtil;
 import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 
 import java.util.Collection;
 import java.util.Collections;
 import java.util.List;
 
 public class HtmlScriptLanguageInjector implements MultiHostInjector {
+
+
+  /**
+   * Finds language to be injected into &lt;script&gt; tag
+   *
+   * @param xmlTag &lt;script&gt; tag
+   * @return language to inject or null if no language found or not a script tag at all
+   */
+  @Nullable
+  public static Language getScriptLanguageToInject(@NotNull XmlTag xmlTag) {
+    if (!HtmlUtil.isScriptTag(xmlTag)) {
+      return null;
+    }
+    String mimeType = xmlTag.getAttributeValue("type");
+    Collection<Language> languages = Language.findInstancesByMimeType(mimeType);
+    return !languages.isEmpty() ? languages.iterator().next() : Language.ANY;
+  }
+
   @Override
   public void getLanguagesToInject(@NotNull MultiHostRegistrar registrar, @NotNull PsiElement host) {
     if (!host.isValid() || !(host instanceof XmlText) || !HtmlUtil.isHtmlTagContainingFile(host)) {
       return;
     }
     XmlTag scriptTag = ((XmlText)host).getParentTag();
-    if (scriptTag == null || !HtmlUtil.isScriptTag(scriptTag)) {
+
+    if (scriptTag == null) {
       return;
     }
-    String mimeType = scriptTag.getAttributeValue("type");
-    Collection<Language> languages = Language.findInstancesByMimeType(mimeType);
-    Language language = !languages.isEmpty() ? languages.iterator().next() : Language.ANY;
+    final Language language = getScriptLanguageToInject(scriptTag);
+
+    if (language == null || HtmlScriptInjectionBlockerExtension.isInjectionBlocked(scriptTag, language)) {
+      return;
+    }
+
     if (LanguageUtil.isInjectableLanguage(language)) {
       registrar
         .startInjecting(language)