diff --git a/core/misc/dropbutton/dropbutton.base-rtl.css b/core/misc/dropbutton/dropbutton.base-rtl.css
index 64684f5..be6fd6c 100644
--- a/core/misc/dropbutton/dropbutton.base-rtl.css
+++ b/core/misc/dropbutton/dropbutton.base-rtl.css
@@ -1,12 +1,11 @@
+
 /**
- * @file dropbutton.base-rtl.css
+ * @file
+ * Base RTL styles for dropbuttons.
  */
 
 /**
  * The dropbutton arrow.
- *
- * The arrow is created using border on a zero-width, zero-height span.
- * The arrow inherits the link color, but can be overridden with border colors.
  */
 .dropbutton-link {
   left: 0;
@@ -18,9 +17,7 @@
 }
 .dropbutton-multiple .dropbutton-widget {
   left: auto;
-  right: 0;
-}
-.dropbutton-multiple .dropbutton-widget {
   padding-left: 2em;
   padding-right: 0;
+  right: 0;
 }
diff --git a/core/misc/dropbutton/dropbutton.base.css b/core/misc/dropbutton/dropbutton.base.css
index 326c015..8eca580 100644
--- a/core/misc/dropbutton/dropbutton.base.css
+++ b/core/misc/dropbutton/dropbutton.base.css
@@ -1,6 +1,10 @@
+
+/**
+ * @file
+ * Base styles for dropbuttons.
+ */
+
 /**
- * @file dropbutton.base.css
- *
  * When a dropbutton has only one option, it is simply a button.
  */
 .dropbutton-wrapper,
@@ -19,7 +23,7 @@
 .dropbutton-widget {
   display: inline-block;
 }
-/* ul styles are over-scoped in core, so this selector needs weight parity */
+/* UL styles are over-scoped in core, so this selector needs weight parity. */
 .dropbutton-widget .dropbutton-content {
   list-style-image: none;
   list-style-type: none;
diff --git a/core/misc/dropbutton/dropbutton.js b/core/misc/dropbutton/dropbutton.js
index 58ebbc1..ec62757 100644
--- a/core/misc/dropbutton/dropbutton.js
+++ b/core/misc/dropbutton/dropbutton.js
@@ -1,9 +1,3 @@
-/**
- * @file dropbutton.js
- *
- * See dropbutton.theme.inc for primary documentation.
- */
-
 (function ($, Drupal, window) {
 
 "use strict";
@@ -24,13 +18,13 @@
 /**
  * A DropButton presents an HTML list as a button with a primary action.
  *
- * Secondary actions - all actions beyond the first in the list - are presented
- * in a dropdown list accessible through a toggle arrow associated with the
- * button.
- *
- * @dropbutton {DOMElement}: An HTMLListElement.
+ * All secondary actions beyond the first in the list are presented in a
+ * dropdown list accessible through a toggle arrow associated with the button.
  *
- * @options {Object}: A list of options including:
+ * @param {DOMElement} dropbutton
+ *   An HTMLListElement.
+ * @param {Object} options
+ *   A list of options including:
  *    - title: The text inside the toggle link element. This text is hidden from
  *      visual UAs.
  */
@@ -70,12 +64,12 @@ function DropButton (dropbutton, settings) {
    * Render the dropbutton view.
    */
   build: function (options) {
-    // Save the id and class attributes so that they can be applied to the
+    // Save the ID and class attributes so that they can be applied to the
     // widget wrapper below.
     options.id = this.$list.attr('id') || '';
     options['class'] = this.$list.attr('class').split(' ') || [];
     options['class'].push('dropbutton-wrapper');
-    // Remove the class and id attributes. The values of these attributes
+    // Remove the class and ID attributes. The values of these attributes
     // will be applied to the dropbutton wrapper.
     this.$list.removeAttr('class id');
     // Mark-up the list with dropbutton structure.
@@ -109,6 +103,7 @@ function DropButton (dropbutton, settings) {
         'click.dropbutton': $.proxy(this, 'toggleClickHandler')
       }, '.dropbutton-link');
   },
+
   hoverIn: function () {
     // Clear any previous timer we were using.
     if (this.timerID) {
@@ -116,20 +111,24 @@ function DropButton (dropbutton, settings) {
     }
     this.isHovered = true;
   },
+
   hoverOut: function () {
     this.isHovered = false;
     this.toggle();
   },
+
   toggleClickHandler: function (event) {
     event.preventDefault();
     var closeIt = (this.isOpen) ? true : false;
     this.toggle(closeIt);
   },
+
   /**
    * Toggle the dropbutton open and closed.
    *
-   * @param closeIt {Boolean}: (optional) Force the dropbutton to close by
-   *    passing true or to close by passing false.
+   * @param {Boolean} closeIt
+   *   (optional) Force the dropbutton to close by passing true or to close by
+   *   passing false.
    */
   toggle: function (closeIt) {
     // Open or close the dropbutton immediately if closeIt is defined.
@@ -144,10 +143,12 @@ function DropButton (dropbutton, settings) {
       this.timerID = window.setTimeout($.proxy(this, 'close'), 500);
     }
   },
+
   close: function () {
     this.isOpen = false;
     this.$dropbutton.removeClass('open');
   },
+
   open: function () {
     this.isOpen = true;
     this.$dropbutton.addClass('open');
@@ -157,7 +158,7 @@ function DropButton (dropbutton, settings) {
 /**
  * A toggle is an interactive element often bound to a click handler.
  *
- * @param Object options:
+ * @param Object options
  *   - String title: (optional) The HTML anchor title attribute and text for the
  *     inner span element.
  *
@@ -167,12 +168,13 @@ function DropButton (dropbutton, settings) {
 Drupal.theme.toggle = function (options) {
   return '<a href="#" class="dropbutton-link" title="' + options.title + '"><span class="dropbutton-arrow"><span class="element-invisible">' + options.title + '</span></span></a>';
 };
+
 /**
  * A wrapping DOM fragment representing a dropbutton widget.
  *
- * @param Object options:
- *   - String id: (optional) An id to be applied to the outer wrapping div.
- *   - Array class: (optional) Classes to be applied to the outer wrapping div.
+ * @param Object options
+ *   - String id: (optional) An ID to apply to the outer wrapping div.
+ *   - Array class: (optional) Classes to apply to the outer wrapping div.
  *
  * @return String
  *   A string representing a DOM fragment.
diff --git a/core/misc/dropbutton/dropbutton.theme-rtl.css b/core/misc/dropbutton/dropbutton.theme-rtl.css
index 27eb994..a5c6c4e 100644
--- a/core/misc/dropbutton/dropbutton.theme-rtl.css
+++ b/core/misc/dropbutton/dropbutton.theme-rtl.css
@@ -1,5 +1,7 @@
+
 /**
- * @file dropbutton.theme-rtl.css
+ * @file
+ * General RTL styles for dropbuttons.
  */
 
 .dropbutton-multiple .dropbutton-content {
diff --git a/core/misc/dropbutton/dropbutton.theme.css b/core/misc/dropbutton/dropbutton.theme.css
index 1360a90..2e52c1c 100644
--- a/core/misc/dropbutton/dropbutton.theme.css
+++ b/core/misc/dropbutton/dropbutton.theme.css
@@ -1,6 +1,9 @@
+
 /**
- * @file dropbutton.theme.css
+ * @file
+ * General styles for dropbuttons.
  */
+
 .dropbutton-wrapper {
   cursor: pointer;
   min-height: 2em;
diff --git a/core/modules/system/tests/modules/theme_test/theme_test.module b/core/modules/system/tests/modules/theme_test/theme_test.module
index 6187361..91a22c1 100644
--- a/core/modules/system/tests/modules/theme_test/theme_test.module
+++ b/core/modules/system/tests/modules/theme_test/theme_test.module
@@ -58,6 +58,19 @@ function theme_test_menu() {
     'access callback' => TRUE,
     'type' => MENU_CALLBACK,
   );
+
+  $items['theme-test'] = array(
+    'title' => 'Theme test',
+    'page callback' => 'system_admin_menu_block_page',
+    'access callback' => TRUE,
+    'file path' => drupal_get_path('module', 'system'),
+    'file' => 'system.admin.inc',
+  );
+  $items['theme-test/list/operations'] = array(
+    'title' => 'Operations',
+    'page callback' => '_theme_test_list_operations',
+    'access callback' => TRUE,
+  );
   return $items;
 }
 
@@ -146,3 +159,78 @@ function theme_test_preprocess_html(&$variables) {
 function theme_theme_test_foo($variables) {
   return $variables['foo'];
 }
+
+/**
+ * Page callback for manual testing of operation links.
+ */
+function _theme_test_list_operations() {
+  $build = array(
+    '#theme' => 'table',
+    '#header' => array('Label', 'Created', 'Operations'),
+    '#rows' => array(),
+  );
+  // Add an item with a very long label, using common operations.
+  $build['#rows']['long']['label'] = l('An item with a very insanely long label, which offers quite a couple of common operations', 'item/long');
+  $build['#rows']['long']['created'] = format_interval(3200);
+  $build['#rows']['long']['operations'] = array(
+    'data' => array(
+      '#theme' => 'dropbutton__node_operations',
+      '#links' => array(
+        'edit' => array(
+          'title' => 'edit',
+          'href' => 'item/long/edit',
+        ),
+        'disable' => array(
+          'title' => 'disable',
+          'href' => 'item/long/disable',
+        ),
+        'clone' => array(
+          'title' => 'clone',
+          'href' => 'item/long/clone',
+        ),
+        'delete' => array(
+          'title' => 'delete',
+          'href' => 'item/long/delete',
+        ),
+      ),
+    ),
+  );
+
+  // Add another item, using common operations.
+  $build['#rows']['another']['label'] = l('Another item, using common operations', 'item/another');
+  $build['#rows']['another']['created'] = format_interval(8600);
+  $build['#rows']['another']['operations'] = $build['#rows']['long']['operations'];
+
+  // Add an item with only one operation.
+  $build['#rows']['one']['label'] = l('An item with only one operation', 'item/one');
+  $build['#rows']['one']['created'] = format_interval(12400);
+  $build['#rows']['one']['operations'] = array(
+    'data' => array(
+      '#theme' => 'dropbutton__node_operations',
+      '#links' => array(
+        'edit' => array(
+          'title' => 'edit',
+          'href' => 'item/long/edit',
+        ),
+      ),
+    ),
+  );
+
+  // Add an item that can only be viewed.
+  $build['#rows']['view']['label'] = l('An item that can only be viewed', 'item/view');
+  $build['#rows']['view']['created'] = format_interval(12400);
+  $build['#rows']['view']['operations'] = array(
+    'data' => array(
+      '#theme' => 'dropbutton__node_operations',
+      '#links' => array(),
+    ),
+  );
+
+  // Add an item for which the default operation is denied.
+  $build['#rows']['denied']['label'] = l('An item for which the default operation is denied', 'item/denied');
+  $build['#rows']['denied']['created'] = format_interval(18600);
+  $build['#rows']['denied']['operations'] = $build['#rows']['long']['operations'];
+  unset($build['#rows']['denied']['operations']['data']['#links']['edit']);
+
+  return $build;
+}