diff --git a/core/modules/ckeditor5/ckeditor5.libraries.yml b/core/modules/ckeditor5/ckeditor5.libraries.yml
index cff3acc4efb..57a5a0b472a 100644
--- a/core/modules/ckeditor5/ckeditor5.libraries.yml
+++ b/core/modules/ckeditor5/ckeditor5.libraries.yml
@@ -90,7 +90,6 @@ ie11.user.warnings:
     - core/drupal
     - core/drupal.message
     - editor/drupal.editor
-    - core/modernizr
 
 ie11.filter.warnings:
   js:
@@ -99,7 +98,6 @@ ie11.filter.warnings:
     - core/drupal
     - core/drupal.message
     - core/once
-    - core/modernizr
 
 drupal.ckeditor5.filter.admin:
   js:
diff --git a/core/modules/ckeditor5/js/ie11.filter.warnings.es6.js b/core/modules/ckeditor5/js/ie11.filter.warnings.es6.js
index 8d92b66f48b..5ca4c4d9e52 100644
--- a/core/modules/ckeditor5/js/ie11.filter.warnings.es6.js
+++ b/core/modules/ckeditor5/js/ie11.filter.warnings.es6.js
@@ -3,7 +3,7 @@
  * Provides IE11 compatibility warnings when choosing a text editor.
  */
 
-((Drupal, once, Modernizr) => {
+((Drupal, once) => {
   /**
    * Presents a warning when selecting CKEditor 5 as a text format's text editor.
    *
@@ -11,9 +11,7 @@
    */
   Drupal.behaviors.ckEditor5warn = {
     attach: function attach() {
-      const isIE11 = Modernizr.mq(
-        '(-ms-high-contrast: active), (-ms-high-contrast: none)',
-      );
+      const isIE11 = !!document.documentMode;
       const editorSelect = once(
         'editor-ie11-warning',
         '[data-drupal-selector="filter-format-edit-form"] [data-drupal-selector="edit-editor-editor"], [data-drupal-selector="filter-format-add-form"] [data-drupal-selector="edit-editor-editor"]',
@@ -120,4 +118,4 @@
       }
     },
   };
-})(Drupal, once, Modernizr);
+})(Drupal, once);
diff --git a/core/modules/ckeditor5/js/ie11.filter.warnings.js b/core/modules/ckeditor5/js/ie11.filter.warnings.js
index 6723e2bb983..61ca106cefb 100644
--- a/core/modules/ckeditor5/js/ie11.filter.warnings.js
+++ b/core/modules/ckeditor5/js/ie11.filter.warnings.js
@@ -5,10 +5,10 @@
 * @preserve
 **/
 
-(function (Drupal, once, Modernizr) {
+(function (Drupal, once) {
   Drupal.behaviors.ckEditor5warn = {
     attach: function attach() {
-      var isIE11 = Modernizr.mq('(-ms-high-contrast: active), (-ms-high-contrast: none)');
+      var isIE11 = !!document.documentMode;
       var editorSelect = once('editor-ie11-warning', '[data-drupal-selector="filter-format-edit-form"] [data-drupal-selector="edit-editor-editor"], [data-drupal-selector="filter-format-add-form"] [data-drupal-selector="edit-editor-editor"]');
 
       if (typeof editorSelect[0] !== 'undefined') {
@@ -66,4 +66,4 @@
       }
     }
   };
-})(Drupal, once, Modernizr);
\ No newline at end of file
+})(Drupal, once);
\ No newline at end of file
diff --git a/core/modules/ckeditor5/js/ie11.user.warnings.es6.js b/core/modules/ckeditor5/js/ie11.user.warnings.es6.js
index 6879f077a03..d71502f17a0 100644
--- a/core/modules/ckeditor5/js/ie11.user.warnings.es6.js
+++ b/core/modules/ckeditor5/js/ie11.user.warnings.es6.js
@@ -3,10 +3,8 @@
  * Provide warnings when attempting to load CKEditor 5 on IE11.
  */
 
-((Drupal, Modernizr) => {
-  const isIE11 = Modernizr.mq(
-    '(-ms-high-contrast: active), (-ms-high-contrast: none)',
-  );
+((Drupal) => {
+  const isIE11 = !!document.documentMode;
 
   // If the browser is IE11, create an alternate version of
   // Drupal.editors.ckeditor5 that provides warnings. In IE11, the incompatible
@@ -143,4 +141,4 @@
       },
     };
   }
-})(Drupal, Modernizr);
+})(Drupal);
diff --git a/core/modules/ckeditor5/js/ie11.user.warnings.js b/core/modules/ckeditor5/js/ie11.user.warnings.js
index ad8988ffc0f..0356cc95ccc 100644
--- a/core/modules/ckeditor5/js/ie11.user.warnings.js
+++ b/core/modules/ckeditor5/js/ie11.user.warnings.js
@@ -5,8 +5,8 @@
 * @preserve
 **/
 
-(function (Drupal, Modernizr) {
-  var isIE11 = Modernizr.mq('(-ms-high-contrast: active), (-ms-high-contrast: none)');
+(function (Drupal) {
+  var isIE11 = !!document.documentMode;
 
   if (isIE11) {
     window.CKEditor5 = null;
@@ -64,4 +64,4 @@
       }
     };
   }
-})(Drupal, Modernizr);
\ No newline at end of file
+})(Drupal);
\ No newline at end of file