diff --git a/core/misc/autocomplete.js b/core/misc/autocomplete.js
index 5e85be44fc5..5e3785f3665 100644
--- a/core/misc/autocomplete.js
+++ b/core/misc/autocomplete.js
@@ -32,7 +32,7 @@ Drupal.behaviors.autocomplete = {
 Drupal.autocompleteSubmit = function () {
   return $('#autocomplete').each(function () {
     this.owner.hidePopup();
-  }).size() == 0;
+  }).length == 0;
 };
 
 /**
@@ -123,7 +123,7 @@ Drupal.jsAC.prototype.selectDown = function () {
   }
   else if (this.popup) {
     var lis = $('li', this.popup);
-    if (lis.size() > 0) {
+    if (lis.length > 0) {
       this.highlight(lis.get(0));
     }
   }
@@ -227,7 +227,7 @@ Drupal.jsAC.prototype.found = function (matches) {
 
   // Show popup with matches, if any.
   if (this.popup) {
-    if (ul.children().size()) {
+    if (ul.children().length) {
       $(this.popup).empty().append(ul).show();
       $(this.ariaLive).html(Drupal.t('Autocomplete popup'));
     }
diff --git a/core/misc/tabledrag.js b/core/misc/tabledrag.js
index 925b4a0dbe6..62b48d9a9d6 100644
--- a/core/misc/tabledrag.js
+++ b/core/misc/tabledrag.js
@@ -123,7 +123,7 @@ Drupal.tableDrag.prototype.initColumns = function () {
     // Find the first field in this group.
     for (var d in this.tableSettings[group]) {
       var field = $('.' + this.tableSettings[group][d].target + ':first', this.table);
-      if (field.size() && this.tableSettings[group][d].hidden) {
+      if (field.length && this.tableSettings[group][d].hidden) {
         var hidden = this.tableSettings[group][d].hidden;
         var cell = field.closest('td');
         break;
@@ -256,7 +256,7 @@ Drupal.tableDrag.prototype.makeDraggable = function (item) {
   if ($('td:first .indentation:last', item).length) {
     $('td:first .indentation:last', item).after(handle);
     // Update the total width of indentation in this entire table.
-    self.indentCount = Math.max($('.indentation', item).size(), self.indentCount);
+    self.indentCount = Math.max($('.indentation', item).length, self.indentCount);
   }
   else {
     $('td:first', item).prepend(handle);
@@ -357,7 +357,7 @@ Drupal.tableDrag.prototype.makeDraggable = function (item) {
           if ($(item).is('.tabledrag-root')) {
             // Swap with the previous top-level row.
             var groupHeight = 0;
-            while (previousRow && $('.indentation', previousRow).size()) {
+            while (previousRow && $('.indentation', previousRow).length) {
               previousRow = $(previousRow).prev('tr').get(0);
               groupHeight += $(previousRow).is(':hidden') ? 0 : previousRow.offsetHeight;
             }
@@ -678,7 +678,7 @@ Drupal.tableDrag.prototype.updateField = function (changedRow, group) {
     var sourceRow = changedRow;
     if ($(previousRow).is('.draggable') && $('.' + group, previousRow).length) {
       if (this.indentEnabled) {
-        if ($('.indentations', previousRow).size() == $('.indentations', changedRow)) {
+        if ($('.indentations', previousRow).length == $('.indentations', changedRow)) {
           sourceRow = previousRow;
         }
       }
@@ -688,7 +688,7 @@ Drupal.tableDrag.prototype.updateField = function (changedRow, group) {
     }
     else if ($(nextRow).is('.draggable') && $('.' + group, nextRow).length) {
       if (this.indentEnabled) {
-        if ($('.indentations', nextRow).size() == $('.indentations', changedRow)) {
+        if ($('.indentations', nextRow).length == $('.indentations', changedRow)) {
           sourceRow = nextRow;
         }
       }
@@ -744,7 +744,7 @@ Drupal.tableDrag.prototype.updateField = function (changedRow, group) {
     switch (rowSettings.action) {
       case 'depth':
         // Get the depth of the target row.
-        targetElement.value = $('.indentation', $(sourceElement).closest('tr')).size();
+        targetElement.value = $('.indentation', $(sourceElement).closest('tr')).length;
         break;
       case 'match':
         // Update the value.
@@ -874,7 +874,7 @@ Drupal.tableDrag.prototype.row = function (tableRow, method, indentEnabled, maxD
   this.element = tableRow;
   this.method = method;
   this.group = [tableRow];
-  this.groupDepth = $('.indentation', tableRow).size();
+  this.groupDepth = $('.indentation', tableRow).length;
   this.changed = false;
   this.table = $(tableRow).closest('table').get(0);
   this.indentEnabled = indentEnabled;
@@ -882,12 +882,12 @@ Drupal.tableDrag.prototype.row = function (tableRow, method, indentEnabled, maxD
   this.direction = ''; // Direction the row is being moved.
 
   if (this.indentEnabled) {
-    this.indents = $('.indentation', tableRow).size();
+    this.indents = $('.indentation', tableRow).length;
     this.children = this.findChildren(addClasses);
     this.group = $.merge(this.group, this.children);
     // Find the depth of this entire group.
     for (var n = 0; n < this.group.length; n++) {
-      this.groupDepth = Math.max($('.indentation', this.group[n]).size(), this.groupDepth);
+      this.groupDepth = Math.max($('.indentation', this.group[n]).length, this.groupDepth);
     }
   }
 };
@@ -999,7 +999,7 @@ Drupal.tableDrag.prototype.row.prototype.validIndentInterval = function (prevRow
 
   // Minimum indentation:
   // Do not orphan the next row.
-  minIndent = nextRow ? $('.indentation', nextRow).size() : 0;
+  minIndent = nextRow ? $('.indentation', nextRow).length : 0;
 
   // Maximum indentation:
   if (!prevRow || $(prevRow).is(':not(.draggable)') || $(this.element).is('.tabledrag-root')) {
@@ -1011,7 +1011,7 @@ Drupal.tableDrag.prototype.row.prototype.validIndentInterval = function (prevRow
   }
   else {
     // Do not go deeper than as a child of the previous row.
-    maxIndent = $('.indentation', prevRow).size() + ($(prevRow).is('.tabledrag-leaf') ? 0 : 1);
+    maxIndent = $('.indentation', prevRow).length + ($(prevRow).is('.tabledrag-leaf') ? 0 : 1);
     // Limit by the maximum allowed depth for the table.
     if (this.maxDepth) {
       maxIndent = Math.min(maxIndent, this.maxDepth - (this.groupDepth - this.indents));
diff --git a/core/misc/tableselect.js b/core/misc/tableselect.js
index d83da2c1e9a..904adb9dfba 100644
--- a/core/misc/tableselect.js
+++ b/core/misc/tableselect.js
@@ -8,7 +8,7 @@ Drupal.behaviors.tableSelect = {
 
 Drupal.tableSelect = function () {
   // Do not add a "Select all" checkbox if there are no rows with checkboxes in the table
-  if ($('td input:checkbox', this).size() == 0) {
+  if ($('td input:checkbox', this).length == 0) {
     return;
   }
 
diff --git a/core/modules/block/block.js b/core/modules/block/block.js
index 6d2c33fd6b1..72b56733a95 100644
--- a/core/modules/block/block.js
+++ b/core/modules/block/block.js
@@ -153,7 +153,7 @@ Drupal.behaviors.blockDrag = {
           }
         }
         // This region has become empty.
-        if ($(this).next('tr').is(':not(.draggable)') || $(this).next('tr').size() == 0) {
+        if ($(this).next('tr').is(':not(.draggable)') || $(this).next('tr').length == 0) {
           $(this).removeClass('region-populated').addClass('region-empty');
         }
         // This region has become populated.
diff --git a/core/modules/file/file.js b/core/modules/file/file.js
index 37419fdf19d..8113170e9dd 100644
--- a/core/modules/file/file.js
+++ b/core/modules/file/file.js
@@ -96,7 +96,7 @@ Drupal.file = Drupal.file || {
 
     // Check if we're working with an "Upload" button.
     var $enabledFields = [];
-    if ($(this).closest('div.form-managed-file').size() > 0) {
+    if ($(this).closest('div.form-managed-file').length > 0) {
       $enabledFields = $(this).closest('div.form-managed-file').find('input.form-file');
     }
 
@@ -120,7 +120,7 @@ Drupal.file = Drupal.file || {
   progressBar: function (event) {
     var clickedButton = this;
     var $progressId = $(clickedButton).closest('div.form-managed-file').find('input.file-progress');
-    if ($progressId.size()) {
+    if ($progressId.length) {
       var originalName = $progressId.attr('name');
 
       // Replace the name with the required identifier.
diff --git a/core/modules/openid/openid.js b/core/modules/openid/openid.js
index fdc97fa06be..4a09e5a4900 100644
--- a/core/modules/openid/openid.js
+++ b/core/modules/openid/openid.js
@@ -7,7 +7,7 @@ Drupal.behaviors.openid = {
     var cookie = $.cookie('Drupal.visitor.openid_identifier');
 
     // This behavior attaches by ID, so is only valid once on a page.
-    if (!$('#edit-openid-identifier.openid-processed').size()) {
+    if (!$('#edit-openid-identifier.openid-processed').length) {
       if (cookie) {
         $('#edit-openid-identifier').val(cookie);
       }
diff --git a/core/modules/simpletest/simpletest.js b/core/modules/simpletest/simpletest.js
index 49334520029..9cab26101a8 100644
--- a/core/modules/simpletest/simpletest.js
+++ b/core/modules/simpletest/simpletest.js
@@ -16,7 +16,7 @@ Drupal.behaviors.simpleTestMenuCollapse = {
     $('div.simpletest-image').click(function () {
       var trs = $(this).closest('tbody').children('.' + settings.simpleTest[this.id].testClass);
       var direction = settings.simpleTest[this.id].imageDirection;
-      var row = direction ? trs.size() - 1 : 0;
+      var row = direction ? trs.length - 1 : 0;
 
       // If clicked in the middle of expanding a group, stop so we can switch directions.
       if (timeout) {
@@ -35,7 +35,7 @@ Drupal.behaviors.simpleTestMenuCollapse = {
           }
         }
         else {
-          if (row < trs.size()) {
+          if (row < trs.length) {
             $(trs[row]).removeClass('js-hide').show();
             row++;
             timeout = setTimeout(rowToggle, 20);
diff --git a/core/modules/taxonomy/taxonomy.js b/core/modules/taxonomy/taxonomy.js
index cc9cdf7a61c..1a0c7908a56 100644
--- a/core/modules/taxonomy/taxonomy.js
+++ b/core/modules/taxonomy/taxonomy.js
@@ -10,7 +10,7 @@ Drupal.behaviors.termDrag = {
   attach: function (context, settings) {
     var table = $('#taxonomy', context);
     var tableDrag = Drupal.tableDrag.taxonomy; // Get the blocks tableDrag object.
-    var rows = $('tr', table).size();
+    var rows = $('tr', table).length;
 
     // When a row is swapped, keep previous and next page classes set.
     tableDrag.row.prototype.onSwap = function (swappedRow) {
diff --git a/core/modules/user/user.js b/core/modules/user/user.js
index 73af27e5d96..042668d8159 100644
--- a/core/modules/user/user.js
+++ b/core/modules/user/user.js
@@ -180,7 +180,7 @@ Drupal.behaviors.fieldUserRegistration = {
   attach: function (context, settings) {
     var $checkbox = $('form#field-ui-field-edit-form input#edit-instance-settings-user-register-form');
 
-    if ($checkbox.size()) {
+    if ($checkbox.length) {
       $('input#edit-instance-required', context).once('user-register-form-checkbox', function () {
         $(this).bind('change', function (e) {
           if ($(this).attr('checked')) {