diff --git a/packages/devextreme/js/__internal/ui/html_editor/m_html_editor.ts b/packages/devextreme/js/__internal/ui/html_editor/m_html_editor.ts
index 7dd6fe097f2a..647fde20262a 100644
--- a/packages/devextreme/js/__internal/ui/html_editor/m_html_editor.ts
+++ b/packages/devextreme/js/__internal/ui/html_editor/m_html_editor.ts
@@ -262,6 +262,7 @@ const HtmlEditor = Editor.inherit({
     this._prepareConverters();
 
     this.callBase();
+    this._toggleReadOnlyState();
   },
 
   _prepareQuillRegistrator() {
diff --git a/packages/devextreme/testing/tests/DevExpress.ui.widgets.htmlEditor/htmlEditorParts/markup.tests.js b/packages/devextreme/testing/tests/DevExpress.ui.widgets.htmlEditor/htmlEditorParts/markup.tests.js
index cfb070ee11c4..9512fbd3da58 100644
--- a/packages/devextreme/testing/tests/DevExpress.ui.widgets.htmlEditor/htmlEditorParts/markup.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.ui.widgets.htmlEditor/htmlEditorParts/markup.tests.js
@@ -109,6 +109,32 @@ export default function() {
     });
 
     QUnit.module('Accessibility', () => {
+        test('aria-readonly should be set on initialization', function(assert) {
+            const $element = $('#htmlEditor');
+
+            $element.dxHtmlEditor({
+                readOnly: true
+            });
+
+            const $editorContent = $element.find(`.${HTML_EDITOR_CONTENT_CLASS}`);
+            assert.strictEqual($editorContent.attr('aria-readonly'), 'true', 'aria-readonly is set on initialization');
+        });
+
+        test('aria-readonly should be set during option change in runtime', function(assert) {
+            const $element = $('#htmlEditor');
+
+            $element.dxHtmlEditor({
+                readOnly: false
+            });
+            const instance = $element.dxHtmlEditor('instance');
+
+            const $editorContent = $element.find(`.${HTML_EDITOR_CONTENT_CLASS}`);
+            assert.strictEqual($editorContent.attr('aria-readonly'), undefined, 'aria-readonly is properly set on initialization');
+
+            instance.option('readOnly', true);
+            assert.strictEqual($editorContent.attr('aria-readonly'), 'true', 'aria-readonly is properly set on runtime');
+        });
+
         test('accessibility roles', function(assert) {
             const $element = $('#htmlEditor');