diff --git a/core/misc/ajax.js b/core/misc/ajax.js
index af8a29cc0c6a..8fe1dcf7ab6c 100644
--- a/core/misc/ajax.js
+++ b/core/misc/ajax.js
@@ -436,7 +436,7 @@
     // interaction while the Ajax request is in progress. ajax.ajaxing prevents
     // the element from triggering a new request, but does not prevent the user
     // from changing its value.
-    $(this.element).addClass('progress-disabled').prop('disabled', true);
+    $(this.element).prop('disabled', true);
 
     // Insert progressbar or throbber.
     if (this.progress.type === 'bar') {
@@ -475,7 +475,7 @@
     if (this.progress.object) {
       this.progress.object.stopMonitoring();
     }
-    $(this.element).removeClass('progress-disabled').prop('disabled', false);
+    $(this.element).prop('disabled', false);
 
     for (var i in response) {
       if (response.hasOwnProperty(i) && response[i].command && this.commands[response[i].command]) {
@@ -538,7 +538,7 @@
     // Undo hide.
     $(this.wrapper).show();
     // Re-enable the element.
-    $(this.element).removeClass('progress-disabled').prop('disabled', false);
+    $(this.element).prop('disabled', false);
     // Reattach behaviors, if they were detached in beforeSerialize().
     if (this.$form) {
       var settings = response.settings || this.settings || drupalSettings;
diff --git a/core/modules/field_ui/field_ui.js b/core/modules/field_ui/field_ui.js
index 6394c3e8d4bd..1167fcc1be1e 100644
--- a/core/modules/field_ui/field_ui.js
+++ b/core/modules/field_ui/field_ui.js
@@ -195,10 +195,7 @@
 
       if (rowNames.length) {
         // Add a throbber next each of the ajaxElements.
-        var $throbber = $('<div class="ajax-progress ajax-progress-throbber"><div class="throbber">&nbsp;</div></div>');
-        $(ajaxElements)
-          .addClass('progress-disabled')
-          .after($throbber);
+        $(ajaxElements).after('<div class="ajax-progress ajax-progress-throbber"><div class="throbber">&nbsp;</div></div>');
 
         // Fire the Ajax update.
         $('input[name=refresh_rows]').val(rowNames.join(' '));
diff --git a/core/modules/file/css/file.admin.css b/core/modules/file/css/file.admin.css
index ff87783aec69..ef7f04d518c3 100644
--- a/core/modules/file/css/file.admin.css
+++ b/core/modules/file/css/file.admin.css
@@ -10,10 +10,6 @@
 .form-managed-file .form-submit {
   margin: 0 0.5em;
 }
-.form-managed-file .progress-disabled {
-  display: inline;
-  float: none;
-}
 .form-managed-file div.ajax-progress-bar {
   display: none;
   margin-top: 4px;
diff --git a/core/modules/views/css/views.module.css b/core/modules/views/css/views.module.css
index 707b71262514..da7a3425a442 100644
--- a/core/modules/views/css/views.module.css
+++ b/core/modules/views/css/views.module.css
@@ -8,11 +8,6 @@
 .views-align-center {
   text-align: center;
 }
-
-.view .progress-disabled {
-  float: none;
-}
-
 /* Grid style column align. */
 .views-view-grid .views-col {
   float: left;
diff --git a/core/modules/views_ui/css/views_ui.admin.css b/core/modules/views_ui/css/views_ui.admin.css
index 05b2d9a2b859..ebcacc5c1eac 100644
--- a/core/modules/views_ui/css/views_ui.admin.css
+++ b/core/modules/views_ui/css/views_ui.admin.css
@@ -286,18 +286,6 @@ div.form-item-options-value-all {
 }
 /* @end */
 
-/* @group Drupal overrides */
-
-/* The .progress-disabled class added to the form on submit floats the element
- * left and causes the form width to shrink-wrap to the content. Setting the
- * width to 100% prevents this.
- */
-#views-ajax-body form {
-  width: 100%;
-}
-
-/* @end */
-
 /* @group Javascript dependent styling */
 
 .js-only {
diff --git a/core/modules/views_ui/css/views_ui.admin.theme.css b/core/modules/views_ui/css/views_ui.admin.theme.css
index b5f2a0398069..a4ebe73368cf 100644
--- a/core/modules/views_ui/css/views_ui.admin.theme.css
+++ b/core/modules/views_ui/css/views_ui.admin.theme.css
@@ -306,19 +306,6 @@ th.views-ui-operations {
 
 /* @group Add view */
 
-/**
- * Drupal core forces AJAX triggering elements to float left when they are
- * disabled due to AJAX processing. On the add view page, we have inline
- * containers where we don't want that behavior; it causes the select dropdown
- * which is triggered to jump to the left while the AJAX throbber is active.
- *
- * See also http://drupal.org/node/769936 (Drupal core issue); when that is
- * fixed it may no longer be necessary to do this.
- */
-.views-admin .container-inline .progress-disabled {
-  float: none;
-}
-
 /**
  * I wish this didn't have to be so specific
  */