diff -u b/core/modules/image/css/editors/image.theme.css b/core/modules/image/css/editors/image.theme.css
--- b/core/modules/image/css/editors/image.theme.css
+++ b/core/modules/image/css/editors/image.theme.css
@@ -61,6 +61,7 @@
   color: white;
   font-family: "Droid sans", "Lucida Grande", sans-serif;
   font-size: 16px;
+  user-select: none;
   -webkit-user-select: none;
   -moz-user-select: none;
   -ms-user-select: none;
diff -u b/core/modules/image/js/theme.js b/core/modules/image/js/theme.js
--- b/core/modules/image/js/theme.js
+++ b/core/modules/image/js/theme.js
@@ -18,7 +18,7 @@
    * @return {string}
    *   The corresponding HTML.
    */
-  Drupal.theme.quickeditImageErrors = function(settings) {
+  Drupal.theme.quickeditImageErrors = function (settings) {
     return '<div class="quickedit-image-errors">' + settings.errors + '</div>';
   };
 
@@ -39,7 +39,7 @@
   Drupal.theme.quickeditImageDropzone = function (settings) {
     return '<div class="quickedit-image-dropzone ' + settings.state + '">' +
       '  <i class="quickedit-image-icon"></i>' +
-      '  <span class="quickedit-image-text">' + settings.text +'</span>' +
+      '  <span class="quickedit-image-text">' + settings.text + '</span>' +
       '</div>';
   };
 
@@ -75,10 +75,10 @@
     if (settings.title_field) {
       html += '  <div>' +
         '    <label for="title" class="' + (settings.title_field_required ? 'form-required' : '') + '">' + Drupal.t('Title') + '</label>' +
-        '    <input type="text" placeholder="' + settings.title + '" value="' + settings.title + '" name="title" ' + ( settings.title_field_required ? 'required' : '') + '/>' +
+        '    <input type="text" placeholder="' + settings.title + '" value="' + settings.title + '" name="title" ' + (settings.title_field_required ? 'required' : '') + '/>' +
         '  </div>';
     }
-    html +=  '</form>';
+    html += '</form>';
 
     return html;
   };
diff -u b/core/modules/image/src/Tests/QuickEditImageControllerTest.php b/core/modules/image/src/Tests/QuickEditImageControllerTest.php
--- b/core/modules/image/src/Tests/QuickEditImageControllerTest.php
+++ b/core/modules/image/src/Tests/QuickEditImageControllerTest.php
@@ -154,7 +154,7 @@
    *
    * @param object $image
    *   The image to upload.
-   * @param integer $nid
+   * @param int $nid
    *   The target node ID.
    * @param string $field_name
    *   The target field machine name.
diff -u b/core/modules/image/tests/src/FunctionalJavascript/QuickEditImageTest.php b/core/modules/image/tests/src/FunctionalJavascript/QuickEditImageTest.php
--- b/core/modules/image/tests/src/FunctionalJavascript/QuickEditImageTest.php
+++ b/core/modules/image/tests/src/FunctionalJavascript/QuickEditImageTest.php
@@ -170,2 +170,3 @@
   }
+
 }
diff -u b/core/themes/stable/css/image/editors/image.theme.css b/core/themes/stable/css/image/editors/image.theme.css
--- b/core/themes/stable/css/image/editors/image.theme.css
+++ b/core/themes/stable/css/image/editors/image.theme.css
@@ -61,6 +61,7 @@
   color: white;
   font-family: "Droid sans", "Lucida Grande", sans-serif;
   font-size: 16px;
+  user-select: none;
   -webkit-user-select: none;
   -moz-user-select: none;
   -ms-user-select: none;
@@ -73,13 +74,22 @@
 }
 
 .quickedit-image-field-info div {
-  margin-right: 10px;
+  margin-right: 10px; /* LTR */
 }
 
 .quickedit-image-field-info div:last-child {
+  margin-right: 0; /* LTR */
+}
+
+[dir="rtl"] .quickedit-image-field-info div {
+  margin-left: 10px;
   margin-right: 0;
 }
 
+[dir="rtl"] .quickedit-image-field-info div:last-child {
+  margin-left: 0;
+}
+
 .quickedit-image-errors .messages__wrapper {
   margin: 0;
   padding: 0;