diff --git a/core/misc/ajax.es6.js b/core/misc/ajax.es6.js
index 418926004a..628ad427d6 100644
--- a/core/misc/ajax.es6.js
+++ b/core/misc/ajax.es6.js
@@ -1036,24 +1036,8 @@
       // Apply any settings from the returned JSON if available.
       const settings = response.settings || ajax.settings || drupalSettings;
 
-      // Store SVG elements
-      const svgStorage = {};
-
       // Parse response.data into an element collection.
-      const $newContent = $($.parseHTML(response.data, true).map((element) => {
-        // If the response contains an SVG, replace it with a placeholder.
-        if (element.nodeName && element.nodeName === 'svg') {
-          // Create an ID to reference later.
-          const hash = `svg-${Math.random().toString(36).substring(7)}`;
-          svgStorage[hash] = element.outerHTML;
-
-          // Create a plceholder DIV that will be replaced with the SVG.
-          const svgPlaceHolder = document.createElement('div');
-          svgPlaceHolder.id = hash;
-          return svgPlaceHolder;
-        }
-        return element;
-      }));
+      const $newContent = $($.parseHTML(response.data, true));
 
       // If removing content from the wrapper, detach behaviors first.
       switch (method) {
@@ -1071,14 +1055,6 @@
       // Add the new content to the page.
       $wrapper[method]($newContent);
 
-      // If there is any SVG data, start replacing them.
-      if (Object.keys(svgStorage).length) {
-        Object.keys(svgStorage).forEach((key) => {
-          // Replace each placeholder DIV with the saved SVG data.
-          $(`#${key}`).replaceWith(svgStorage[key]);
-        });
-      }
-
       // Immediately hide the new content if we're using any effects.
       if (effect.showEffect !== 'show') {
         $newContent.hide();
diff --git a/core/misc/ajax.js b/core/misc/ajax.js
index 7977ee5d31..062fb10b59 100644
--- a/core/misc/ajax.js
+++ b/core/misc/ajax.js
@@ -487,19 +487,7 @@ function _toConsumableArray(arr) { if (Array.isArray(arr)) { for (var i = 0, arr
 
       var settings = response.settings || ajax.settings || drupalSettings;
 
-      var svgStorage = {};
-
-      var $newContent = $($.parseHTML(response.data, true).map(function (element) {
-        if (element.nodeName && element.nodeName === 'svg') {
-          var hash = 'svg-' + Math.random().toString(36).substring(7);
-          svgStorage[hash] = element.outerHTML;
-
-          var svgPlaceHolder = document.createElement('div');
-          svgPlaceHolder.id = hash;
-          return svgPlaceHolder;
-        }
-        return element;
-      }));
+      var $newContent = $($.parseHTML(response.data, true));
 
       switch (method) {
         case 'html':
@@ -515,12 +503,6 @@ function _toConsumableArray(arr) { if (Array.isArray(arr)) { for (var i = 0, arr
 
       $wrapper[method]($newContent);
 
-      if (Object.keys(svgStorage).length) {
-        Object.keys(svgStorage).forEach(function (key) {
-          $('#' + key).replaceWith(svgStorage[key]);
-        });
-      }
-
       if (effect.showEffect !== 'show') {
         $newContent.hide();
       }
@@ -614,4 +596,4 @@ function _toConsumableArray(arr) { if (Array.isArray(arr)) { for (var i = 0, arr
       }
     }
   };
-})(jQuery, window, Drupal, drupalSettings);
\ No newline at end of file
+})(jQuery, window, Drupal, drupalSettings);
diff --git a/core/modules/system/tests/modules/ajax_test/js/insert-ajax.es6.js b/core/modules/system/tests/modules/ajax_test/js/insert-ajax.es6.js
deleted file mode 100644
index e7fb3f212b..0000000000
--- a/core/modules/system/tests/modules/ajax_test/js/insert-ajax.es6.js
+++ /dev/null
@@ -1,39 +0,0 @@
-/**
- * @file
- * Drupal behavior to attach click event handlers to ajax-insert and
- * ajax-insert-inline links for testing ajax requests.
- */
-
-(function ($, window, Drupal) {
-  Drupal.behaviors.insertTest = {
-    attach(context) {
-      $('.ajax-insert').once('ajax-insert').on('click', (event) => {
-        event.preventDefault();
-        const ajaxSettings = {
-          url: event.currentTarget.getAttribute('href'),
-          wrapper: 'ajax-target',
-          base: false,
-          element: false,
-          method: event.currentTarget.getAttribute('data-method'),
-        };
-        const myAjaxObject = Drupal.ajax(ajaxSettings);
-        myAjaxObject.execute();
-      });
-
-      $('.ajax-insert-inline').once('ajax-insert').on('click', (event) => {
-        event.preventDefault();
-        const ajaxSettings = {
-          url: event.currentTarget.getAttribute('href'),
-          wrapper: 'ajax-target-inline',
-          base: false,
-          element: false,
-          method: event.currentTarget.getAttribute('data-method'),
-        };
-        const myAjaxObject = Drupal.ajax(ajaxSettings);
-        myAjaxObject.execute();
-      });
-
-      $(context).addClass('processed');
-    },
-  };
-}(jQuery, window, Drupal));
diff --git a/core/modules/system/tests/modules/ajax_test/js/insert-ajax.js b/core/modules/system/tests/modules/ajax_test/js/insert-ajax.js
deleted file mode 100644
index c261bca80a..0000000000
--- a/core/modules/system/tests/modules/ajax_test/js/insert-ajax.js
+++ /dev/null
@@ -1,40 +0,0 @@
-/**
-* DO NOT EDIT THIS FILE.
-* See the following change record for more information,
-* https://www.drupal.org/node/2815083
-* @preserve
-**/
-
-(function ($, window, Drupal) {
-  Drupal.behaviors.insertTest = {
-    attach: function attach(context) {
-      $('.ajax-insert').once('ajax-insert').on('click', function (event) {
-        event.preventDefault();
-        var ajaxSettings = {
-          url: event.currentTarget.getAttribute('href'),
-          wrapper: 'ajax-target',
-          base: false,
-          element: false,
-          method: event.currentTarget.getAttribute('data-method')
-        };
-        var myAjaxObject = Drupal.ajax(ajaxSettings);
-        myAjaxObject.execute();
-      });
-
-      $('.ajax-insert-inline').once('ajax-insert').on('click', function (event) {
-        event.preventDefault();
-        var ajaxSettings = {
-          url: event.currentTarget.getAttribute('href'),
-          wrapper: 'ajax-target-inline',
-          base: false,
-          element: false,
-          method: event.currentTarget.getAttribute('data-method')
-        };
-        var myAjaxObject = Drupal.ajax(ajaxSettings);
-        myAjaxObject.execute();
-      });
-
-      $(context).addClass('processed');
-    }
-  };
-})(jQuery, window, Drupal);
\ No newline at end of file
diff --git a/core/tests/Drupal/FunctionalJavascriptTests/Ajax/AjaxTest.php b/core/tests/Drupal/FunctionalJavascriptTests/Ajax/AjaxTest.php
index 7a8895c9f6..c76f7136f5 100644
--- a/core/tests/Drupal/FunctionalJavascriptTests/Ajax/AjaxTest.php
+++ b/core/tests/Drupal/FunctionalJavascriptTests/Ajax/AjaxTest.php
@@ -73,7 +73,7 @@ public function testDrupalSettingsCachingRegression() {
 
     // Insert a fake library into the already loaded library settings.
     $fake_library = 'fakeLibrary/fakeLibrary';
-    $session->evaluateScript("drupalSettings.ajaxPageState.libraries = drupalSettings.ajaxPageState.libraries + ',$fake_library';");
+    $session->evaluateScript("drupalSettings.ajaxPageState.libraries = drupalSettings.ajaxPageState.libraries  ',$fake_library';");
 
     $libraries = $session->evaluateScript('drupalSettings.ajaxPageState.libraries');
     // Test that the fake library is set.
@@ -101,7 +101,7 @@ public function testDrupalSettingsCachingRegression() {
     $this->assertNotContains($fake_library, $libraries);
   }
 
-  /**
+/**
    * Tests that various AJAX responses with DOM elements are correctly inserted.
    *
    * After inserting DOM elements, Drupal JavaScript behaviors should be