diff --git a/core/misc/dropbutton/dropbutton.js b/core/misc/dropbutton/dropbutton.js
index 7bcd17c..d660395 100644
--- a/core/misc/dropbutton/dropbutton.js
+++ b/core/misc/dropbutton/dropbutton.js
@@ -8,7 +8,7 @@
   "use strict";
 
   /**
-   * Process elements with the .dropbutton class on page load.
+   * Process elements with the .js-dropbutton class on page load.
    *
    * @type {Drupal~behavior}
    */
diff --git a/core/modules/book/src/Tests/BookTest.php b/core/modules/book/src/Tests/BookTest.php
index db7f670..bac8143 100644
--- a/core/modules/book/src/Tests/BookTest.php
+++ b/core/modules/book/src/Tests/BookTest.php
@@ -733,7 +733,7 @@ public function testAdminBookNodeListing() {
     $this->drupalGet('admin/structure/book/' . $this->book->id());
     $this->assertText($this->book->label(), 'The book title is displayed on the administrative book listing page.');
 
-    $elements = $this->xpath('//table//div[@class="dropbutton"]//a');
+    $elements = $this->xpath('//table//div[@class="js-dropbutton"]//a');
     $this->assertEqual((string) $elements[0], 'View', 'View link is found from the list.');
   }
 
diff --git a/core/modules/content_translation/src/Tests/ContentTranslationUITestBase.php b/core/modules/content_translation/src/Tests/ContentTranslationUITestBase.php
index ac15fcf..a800fdd 100644
--- a/core/modules/content_translation/src/Tests/ContentTranslationUITestBase.php
+++ b/core/modules/content_translation/src/Tests/ContentTranslationUITestBase.php
@@ -215,7 +215,7 @@ protected function doTestTranslationOverview() {
         $elements = $this->xpath('//table//a[@href=:href]', array(':href' => $view_path));
         $this->assertEqual((string) $elements[0], $entity->getTranslation($langcode)->label(), format_string('Label correctly shown for %language translation.', array('%language' => $langcode)));
         $edit_path = $entity->url('edit-form', array('language' => $language));
-        $elements = $this->xpath('//table//div[@class="dropbutton"]//a[@href=:href]', array(':href' => $edit_path));
+        $elements = $this->xpath('//table//div[@class="js-dropbutton"]//a[@href=:href]', array(':href' => $edit_path));
         $this->assertEqual((string) $elements[0], t('Edit'), format_string('Edit link correct for %language translation.', array('%language' => $langcode)));
       }
     }
diff --git a/core/modules/field_ui/src/Tests/ManageFieldsTest.php b/core/modules/field_ui/src/Tests/ManageFieldsTest.php
index 7d06cb3..652279a 100644
--- a/core/modules/field_ui/src/Tests/ManageFieldsTest.php
+++ b/core/modules/field_ui/src/Tests/ManageFieldsTest.php
@@ -153,7 +153,7 @@ function manageFieldsPage($type = '') {
     // Assert entity operations for all fields.
     $number_of_links = 3;
     $number_of_links_found = 0;
-    $operation_links = $this->xpath('//div[@class = "dropbutton"]//a');
+    $operation_links = $this->xpath('//div[@class = "js-dropbutton"]//a');
     $url = base_path() . "admin/structure/types/manage/$type/fields/node.$type.body";
 
     foreach ($operation_links as $link) {
diff --git a/core/modules/language/config/optional/tour.tour.language.yml b/core/modules/language/config/optional/tour.tour.language.yml
index 75ae846..e0775d1 100644
--- a/core/modules/language/config/optional/tour.tour.language.yml
+++ b/core/modules/language/config/optional/tour.tour.language.yml
@@ -44,7 +44,7 @@ tips:
     body: '<p>Operations are provided for editing and deleting your languages.</p><p>You can edit the name and the direction of the language.</p><p>Deleted languages can be added back at a later time. Deleting a language will remove all interface translations associated with it, and content in this language will be set to be language neutral. Note that you cannot delete the default language of the site.</p>'
     weight: 5
     attributes:
-      data-class: dropbutton
+      data-class: js-dropbutton
   language-continue:
     id: language-continue
     plugin: text
diff --git a/core/modules/views/src/Tests/Plugin/RowRenderCacheTest.php b/core/modules/views/src/Tests/Plugin/RowRenderCacheTest.php
index 828d5f1..e17cd57 100644
--- a/core/modules/views/src/Tests/Plugin/RowRenderCacheTest.php
+++ b/core/modules/views/src/Tests/Plugin/RowRenderCacheTest.php
@@ -157,7 +157,7 @@ protected function doTestRenderedOutput(AccountInterface $account, $check_cache
       $output = $view->style_plugin->getField($index, 'delete_node');
       $this->assertEqual($output, $expected);
 
-      $expected = $access ? "  <div class=\"dropbutton\"><ul class=\"dropbutton__menu js-dropbutton__menu\">" .
+      $expected = $access ? "  <div class=\"js-dropbutton\"><ul class=\"dropbutton__menu js-dropbutton__menu\">" .
           "<li class=\"edit\"><a href=\"$node_url/edit?destination=/\" hreflang=\"en\">Edit</a></li>" .
           "<li class=\"delete\"><a href=\"$node_url/delete?destination=/\" hreflang=\"en\">Delete</a></li>" .
           "</ul></div>" : "";