diff --git a/core/build.gradle b/core/build.gradle
index 7385cfa84..4fb98c5f8 100644
--- a/core/build.gradle
+++ b/core/build.gradle
@@ -25,6 +25,7 @@ def screenshotsForGoldensDir = "${project.buildDir}/screenshots_for_goldens"
 def newGoldensDir = "${project.buildDir}/new_golden_images"
 def goldensDir =
   "${javaTestDir}/google/registry/webdriver/goldens/chrome-linux"
+def jsDir = "${project.projectDir}/src/main/javascript"
 
 // Tests that conflict with (mostly unidentified) members of the main test
 // suite. It is unclear if they are offenders (i.e., those that pollute global
@@ -480,7 +481,7 @@ task soyToJS {
 }
 
 task stylesheetsToJavascript {
-  def cssSourceDir = "${javaDir}/google/registry/ui/css"
+  def cssSourceDir = "${jsDir}/google/registry/ui/css"
   def outputDir = "${resourcesDir}/google/registry/ui/css"
   inputs.dir cssSourceDir
   outputs.dir outputDir
@@ -533,8 +534,8 @@ task compileProdJS(type: JavaExec) {
   def outputDir = "${resourcesDir}/google/registry/ui"
   def nodeModulesDir = "${rootDir}/node_modules"
   def cssSourceDir = "${resourcesDir}/google/registry/ui/css"
-  def jsSourceDir = "${javaDir}/google/registry/ui/js"
-  def externsDir = "${javaDir}/google/registry/ui/externs"
+  def jsSourceDir = "${jsDir}/google/registry/ui/js"
+  def externsDir = "${jsDir}/google/registry/ui/externs"
   def soySourceDir = "${generatedDir}/google/registry/ui/soy"
 
   [nodeModulesDir, cssSourceDir, jsSourceDir, externsDir, soySourceDir].each {
diff --git a/core/src/main/java/google/registry/ui/conformance_proto.txt b/core/src/main/java/google/registry/ui/conformance_proto.txt
deleted file mode 100644
index 5d9179e25..000000000
--- a/core/src/main/java/google/registry/ui/conformance_proto.txt
+++ /dev/null
@@ -1,8 +0,0 @@
-# -*-protobuf-*-
-
-requirement: {
-  type: BANNED_PROPERTY_WRITE
-  error_message: 'Assignment to Element.prototype.innerHTML is not allowed. '
-      'Use goog.dom.safe.setInnerHtml instead. '
-  value: 'Element.prototype.innerHTML'
-}
diff --git a/core/src/main/java/google/registry/ui/compile_test.js b/core/src/main/javascript/google/registry/ui/compile_test.js
similarity index 100%
rename from core/src/main/java/google/registry/ui/compile_test.js
rename to core/src/main/javascript/google/registry/ui/compile_test.js
diff --git a/core/src/main/java/google/registry/ui/css/admin-settings.css b/core/src/main/javascript/google/registry/ui/css/admin-settings.css
similarity index 100%
rename from core/src/main/java/google/registry/ui/css/admin-settings.css
rename to core/src/main/javascript/google/registry/ui/css/admin-settings.css
diff --git a/core/src/main/java/google/registry/ui/css/console.css b/core/src/main/javascript/google/registry/ui/css/console.css
similarity index 100%
rename from core/src/main/java/google/registry/ui/css/console.css
rename to core/src/main/javascript/google/registry/ui/css/console.css
diff --git a/core/src/main/java/google/registry/ui/css/contact-settings.css b/core/src/main/javascript/google/registry/ui/css/contact-settings.css
similarity index 100%
rename from core/src/main/java/google/registry/ui/css/contact-settings.css
rename to core/src/main/javascript/google/registry/ui/css/contact-settings.css
diff --git a/core/src/main/java/google/registry/ui/css/contact-us.css b/core/src/main/javascript/google/registry/ui/css/contact-us.css
similarity index 100%
rename from core/src/main/java/google/registry/ui/css/contact-us.css
rename to core/src/main/javascript/google/registry/ui/css/contact-us.css
diff --git a/core/src/main/java/google/registry/ui/css/dashboard.css b/core/src/main/javascript/google/registry/ui/css/dashboard.css
similarity index 100%
rename from core/src/main/java/google/registry/ui/css/dashboard.css
rename to core/src/main/javascript/google/registry/ui/css/dashboard.css
diff --git a/core/src/main/java/google/registry/ui/css/demo_css.css b/core/src/main/javascript/google/registry/ui/css/demo_css.css
similarity index 100%
rename from core/src/main/java/google/registry/ui/css/demo_css.css
rename to core/src/main/javascript/google/registry/ui/css/demo_css.css
diff --git a/core/src/main/java/google/registry/ui/css/epp.css b/core/src/main/javascript/google/registry/ui/css/epp.css
similarity index 100%
rename from core/src/main/java/google/registry/ui/css/epp.css
rename to core/src/main/javascript/google/registry/ui/css/epp.css
diff --git a/core/src/main/java/google/registry/ui/css/forms.css b/core/src/main/javascript/google/registry/ui/css/forms.css
similarity index 100%
rename from core/src/main/java/google/registry/ui/css/forms.css
rename to core/src/main/javascript/google/registry/ui/css/forms.css
diff --git a/core/src/main/java/google/registry/ui/css/kd_components.css b/core/src/main/javascript/google/registry/ui/css/kd_components.css
similarity index 100%
rename from core/src/main/java/google/registry/ui/css/kd_components.css
rename to core/src/main/javascript/google/registry/ui/css/kd_components.css
diff --git a/core/src/main/java/google/registry/ui/css/registrar_imports_raw.css b/core/src/main/javascript/google/registry/ui/css/registrar_imports_raw.css
similarity index 100%
rename from core/src/main/java/google/registry/ui/css/registrar_imports_raw.css
rename to core/src/main/javascript/google/registry/ui/css/registrar_imports_raw.css
diff --git a/core/src/main/java/google/registry/ui/css/registry.css b/core/src/main/javascript/google/registry/ui/css/registry.css
similarity index 100%
rename from core/src/main/java/google/registry/ui/css/registry.css
rename to core/src/main/javascript/google/registry/ui/css/registry.css
diff --git a/core/src/main/java/google/registry/ui/css/resources.css b/core/src/main/javascript/google/registry/ui/css/resources.css
similarity index 100%
rename from core/src/main/java/google/registry/ui/css/resources.css
rename to core/src/main/javascript/google/registry/ui/css/resources.css
diff --git a/core/src/main/java/google/registry/ui/css/security-settings.css b/core/src/main/javascript/google/registry/ui/css/security-settings.css
similarity index 100%
rename from core/src/main/java/google/registry/ui/css/security-settings.css
rename to core/src/main/javascript/google/registry/ui/css/security-settings.css
diff --git a/core/src/main/java/google/registry/ui/externs/json.js b/core/src/main/javascript/google/registry/ui/externs/json.js
similarity index 100%
rename from core/src/main/java/google/registry/ui/externs/json.js
rename to core/src/main/javascript/google/registry/ui/externs/json.js
diff --git a/core/src/main/java/google/registry/ui/js/component.js b/core/src/main/javascript/google/registry/ui/js/component.js
similarity index 100%
rename from core/src/main/java/google/registry/ui/js/component.js
rename to core/src/main/javascript/google/registry/ui/js/component.js
diff --git a/core/src/main/java/google/registry/ui/js/console.js b/core/src/main/javascript/google/registry/ui/js/console.js
similarity index 100%
rename from core/src/main/java/google/registry/ui/js/console.js
rename to core/src/main/javascript/google/registry/ui/js/console.js
diff --git a/core/src/main/java/google/registry/ui/js/edit_item.js b/core/src/main/javascript/google/registry/ui/js/edit_item.js
similarity index 100%
rename from core/src/main/java/google/registry/ui/js/edit_item.js
rename to core/src/main/javascript/google/registry/ui/js/edit_item.js
diff --git a/core/src/main/java/google/registry/ui/js/forms.js b/core/src/main/javascript/google/registry/ui/js/forms.js
similarity index 100%
rename from core/src/main/java/google/registry/ui/js/forms.js
rename to core/src/main/javascript/google/registry/ui/js/forms.js
diff --git a/core/src/main/java/google/registry/ui/js/menu_button.js b/core/src/main/javascript/google/registry/ui/js/menu_button.js
similarity index 100%
rename from core/src/main/java/google/registry/ui/js/menu_button.js
rename to core/src/main/javascript/google/registry/ui/js/menu_button.js
diff --git a/core/src/main/java/google/registry/ui/js/registrar/admin_settings.js b/core/src/main/javascript/google/registry/ui/js/registrar/admin_settings.js
similarity index 100%
rename from core/src/main/java/google/registry/ui/js/registrar/admin_settings.js
rename to core/src/main/javascript/google/registry/ui/js/registrar/admin_settings.js
diff --git a/core/src/main/java/google/registry/ui/js/registrar/console.js b/core/src/main/javascript/google/registry/ui/js/registrar/console.js
similarity index 100%
rename from core/src/main/java/google/registry/ui/js/registrar/console.js
rename to core/src/main/javascript/google/registry/ui/js/registrar/console.js
diff --git a/core/src/main/java/google/registry/ui/js/registrar/contact_settings.js b/core/src/main/javascript/google/registry/ui/js/registrar/contact_settings.js
similarity index 100%
rename from core/src/main/java/google/registry/ui/js/registrar/contact_settings.js
rename to core/src/main/javascript/google/registry/ui/js/registrar/contact_settings.js
diff --git a/core/src/main/java/google/registry/ui/js/registrar/contact_us.js b/core/src/main/javascript/google/registry/ui/js/registrar/contact_us.js
similarity index 100%
rename from core/src/main/java/google/registry/ui/js/registrar/contact_us.js
rename to core/src/main/javascript/google/registry/ui/js/registrar/contact_us.js
diff --git a/core/src/main/java/google/registry/ui/js/registrar/dashboard.js b/core/src/main/javascript/google/registry/ui/js/registrar/dashboard.js
similarity index 100%
rename from core/src/main/java/google/registry/ui/js/registrar/dashboard.js
rename to core/src/main/javascript/google/registry/ui/js/registrar/dashboard.js
diff --git a/core/src/main/java/google/registry/ui/js/registrar/main.js b/core/src/main/javascript/google/registry/ui/js/registrar/main.js
similarity index 100%
rename from core/src/main/java/google/registry/ui/js/registrar/main.js
rename to core/src/main/javascript/google/registry/ui/js/registrar/main.js
diff --git a/core/src/main/java/google/registry/ui/js/registrar/resources.js b/core/src/main/javascript/google/registry/ui/js/registrar/resources.js
similarity index 100%
rename from core/src/main/java/google/registry/ui/js/registrar/resources.js
rename to core/src/main/javascript/google/registry/ui/js/registrar/resources.js
diff --git a/core/src/main/java/google/registry/ui/js/registrar/security_settings.js b/core/src/main/javascript/google/registry/ui/js/registrar/security_settings.js
similarity index 100%
rename from core/src/main/java/google/registry/ui/js/registrar/security_settings.js
rename to core/src/main/javascript/google/registry/ui/js/registrar/security_settings.js
diff --git a/core/src/main/java/google/registry/ui/js/registrar/whois_settings.js b/core/src/main/javascript/google/registry/ui/js/registrar/whois_settings.js
similarity index 100%
rename from core/src/main/java/google/registry/ui/js/registrar/whois_settings.js
rename to core/src/main/javascript/google/registry/ui/js/registrar/whois_settings.js
diff --git a/core/src/main/java/google/registry/ui/js/resource.js b/core/src/main/javascript/google/registry/ui/js/resource.js
similarity index 100%
rename from core/src/main/java/google/registry/ui/js/resource.js
rename to core/src/main/javascript/google/registry/ui/js/resource.js
diff --git a/core/src/main/java/google/registry/ui/js/resource_component.js b/core/src/main/javascript/google/registry/ui/js/resource_component.js
similarity index 100%
rename from core/src/main/java/google/registry/ui/js/resource_component.js
rename to core/src/main/javascript/google/registry/ui/js/resource_component.js
diff --git a/core/src/main/java/google/registry/ui/js/session.js b/core/src/main/javascript/google/registry/ui/js/session.js
similarity index 100%
rename from core/src/main/java/google/registry/ui/js/session.js
rename to core/src/main/javascript/google/registry/ui/js/session.js
diff --git a/core/src/main/java/google/registry/ui/js/util.js b/core/src/main/javascript/google/registry/ui/js/util.js
similarity index 100%
rename from core/src/main/java/google/registry/ui/js/util.js
rename to core/src/main/javascript/google/registry/ui/js/util.js
diff --git a/core/src/test/java/google/registry/ui/js/component_test.js b/core/src/test/javascript/google/registry/ui/js/component_test.js
similarity index 100%
rename from core/src/test/java/google/registry/ui/js/component_test.js
rename to core/src/test/javascript/google/registry/ui/js/component_test.js
diff --git a/core/src/test/java/google/registry/ui/js/registrar/console_test.js b/core/src/test/javascript/google/registry/ui/js/registrar/console_test.js
similarity index 100%
rename from core/src/test/java/google/registry/ui/js/registrar/console_test.js
rename to core/src/test/javascript/google/registry/ui/js/registrar/console_test.js
diff --git a/core/src/test/java/google/registry/ui/js/registrar/console_test_util.js b/core/src/test/javascript/google/registry/ui/js/registrar/console_test_util.js
similarity index 100%
rename from core/src/test/java/google/registry/ui/js/registrar/console_test_util.js
rename to core/src/test/javascript/google/registry/ui/js/registrar/console_test_util.js
diff --git a/core/src/test/java/google/registry/ui/js/registrar/contact_settings_test.js b/core/src/test/javascript/google/registry/ui/js/registrar/contact_settings_test.js
similarity index 100%
rename from core/src/test/java/google/registry/ui/js/registrar/contact_settings_test.js
rename to core/src/test/javascript/google/registry/ui/js/registrar/contact_settings_test.js
diff --git a/core/src/test/java/google/registry/ui/js/registrar/security_settings_test.js b/core/src/test/javascript/google/registry/ui/js/registrar/security_settings_test.js
similarity index 100%
rename from core/src/test/java/google/registry/ui/js/registrar/security_settings_test.js
rename to core/src/test/javascript/google/registry/ui/js/registrar/security_settings_test.js
diff --git a/core/src/test/java/google/registry/ui/js/registrar/whois_settings_test.js b/core/src/test/javascript/google/registry/ui/js/registrar/whois_settings_test.js
similarity index 100%
rename from core/src/test/java/google/registry/ui/js/registrar/whois_settings_test.js
rename to core/src/test/javascript/google/registry/ui/js/registrar/whois_settings_test.js
diff --git a/core/src/test/java/google/registry/ui/js/testing.js b/core/src/test/javascript/google/registry/ui/js/testing.js
similarity index 100%
rename from core/src/test/java/google/registry/ui/js/testing.js
rename to core/src/test/javascript/google/registry/ui/js/testing.js
diff --git a/karma.conf.js b/karma.conf.js
index 34da248ec..f985c3f81 100644
--- a/karma.conf.js
+++ b/karma.conf.js
@@ -28,13 +28,13 @@ module.exports = function(config) {
     autoWatch: false,
     files: [
       'node_modules/google-closure-library/closure/goog/base.js',
-      'core/build/resources/test/**/*_test.js',
+      'core/src/test/javascript/**/*_test.js',
       {
-        pattern: 'core/build/resources/test/**/!(*_test).js',
+        pattern: 'core/src/test/javascript/**/!(*_test).js',
         included: false
       },
       {
-        pattern: 'core/build/resources/main/**/*.js',
+        pattern: 'core/src/main/javascript/**/*.js',
         included: false
       },
       {
@@ -63,9 +63,7 @@ module.exports = function(config) {
       'node_modules/google-closure-library/closure/goog/deps.js': ['closure', 'closure-deps'],
       'node_modules/google-closure-library/closure/goog/base.js': ['closure'],
       'node_modules/google-closure-library/closure/**/*.js': ['closure'],
-      'core/build/resources/test/**/*_test.js': ['closure'],
-      'core/build/resources/test/**/!(*_test).js': ['closure'],
-      'core/build/resources/main/**/*.js': ['closure'],
+      'core/src/*/javascript/**/*.js': ['closure'],
       'core/build/generated/source/custom/main/**/*.soy.js': ['closure'],
       'node_modules/soyutils_usegoog.js': ['closure']
     },