diff --git a/packages/overlayscrollbars/src/observers/domObserver.ts b/packages/overlayscrollbars/src/observers/domObserver.ts
index ad3f842..6685fa4 100644
--- a/packages/overlayscrollbars/src/observers/domObserver.ts
+++ b/packages/overlayscrollbars/src/observers/domObserver.ts
@@ -15,7 +15,7 @@ import {
   runEachAndClear,
 } from 'support';
 
-type DOMContentObserverCallback = (contentChangedTroughEvent: boolean) => any;
+type DOMContentObserverCallback = (contentChangedThroughEvent: boolean) => any;
 
 type DOMTargetObserverCallback = (targetChangedAttrs: string[], targetStyleChanged: boolean) => any;
 
diff --git a/packages/overlayscrollbars/src/setups/structureSetup/structureSetup.elements.ts b/packages/overlayscrollbars/src/setups/structureSetup/structureSetup.elements.ts
index 12dc3af..b50e856 100644
--- a/packages/overlayscrollbars/src/setups/structureSetup/structureSetup.elements.ts
+++ b/packages/overlayscrollbars/src/setups/structureSetup/structureSetup.elements.ts
@@ -33,11 +33,11 @@ import {
 } from 'classnames';
 import { getEnvironment } from 'environment';
 import { getPlugins, scrollbarsHidingPluginName } from 'plugins';
-import type { ScrollbarsHidingPluginInstance } from 'plugins/scrollbarsHidingPlugin';
 import {
   staticInitializationElement as generalStaticInitializationElement,
   dynamicInitializationElement as generalDynamicInitializationElement,
 } from 'initialization';
+import type { ScrollbarsHidingPluginInstance } from 'plugins/scrollbarsHidingPlugin';
 import type {
   InitializationTarget,
   InitializationTargetElement,
diff --git a/packages/overlayscrollbars/src/setups/structureSetup/structureSetup.observers.ts b/packages/overlayscrollbars/src/setups/structureSetup/structureSetup.observers.ts
index e8e518f..8e0da50 100644
--- a/packages/overlayscrollbars/src/setups/structureSetup/structureSetup.observers.ts
+++ b/packages/overlayscrollbars/src/setups/structureSetup/structureSetup.observers.ts
@@ -186,13 +186,13 @@ export const createStructureSetupObservers = (
 
     updateFn({ _sizeChanged, _directionChanged: directionChanged });
   };
-  const onContentMutation = (contentChangedTroughEvent: boolean, fromRecords?: true) => {
+  const onContentMutation = (contentChangedThroughEvent: boolean, fromRecords?: true) => {
     const [, contentSizeChanged] = updateContentSizeCache();
     const updateHints: Partial<StructureSetupUpdateHints> = {
       _contentMutation: contentSizeChanged,
     };
-    // if contentChangedTroughEvent is true its already debounced
-    const updateFn = contentChangedTroughEvent
+    // if contentChangedThroughEvent is true its already debounced
+    const updateFn = contentChangedThroughEvent
       ? structureSetupUpdate
       : structureSetupUpdateWithDebouncedAdaptiveUpdateHints;
 
diff --git a/packages/overlayscrollbars/tests/jest-jsdom/setups/structureSetup/structureSetup.elements.test.ts b/packages/overlayscrollbars/tests/jest-jsdom/setups/structureSetup/structureSetup.elements.test.ts
index 19af797..558f75f 100644
--- a/packages/overlayscrollbars/tests/jest-jsdom/setups/structureSetup/structureSetup.elements.test.ts
+++ b/packages/overlayscrollbars/tests/jest-jsdom/setups/structureSetup/structureSetup.elements.test.ts
@@ -130,9 +130,14 @@ const assertCorrectDOMStructure = (targetType: TargetType, viewportIsTarget: boo
 };
 
 const createStructureSetupElementsProxy = (
-  target: InitializationTarget
+  target: InitializationTarget,
+  tabindex?: boolean
 ): StructureSetupElementsProxy => {
   const [elements, appendElements, destroy] = createStructureSetupElements(target);
+  // simulate tabindex inheritance from host via mutation observer
+  if (tabindex) {
+    elements._viewport.setAttribute('tabindex', elements._target.getAttribute('tabindex')!);
+  }
   appendElements();
   return {
     input: target,
@@ -1117,13 +1122,13 @@ describe('structureSetup.elements', () => {
         const target = document.body.firstElementChild as HTMLElement;
         target.focus();
 
-        const { elements } = createStructureSetupElementsProxy(target);
+        const { elements } = createStructureSetupElementsProxy(target, true);
         expect(elements._viewport.getAttribute('tabindex')).toBe('-1');
         expect(document.activeElement).toBe(elements._viewport);
 
         elements._documentElm.dispatchEvent(new Event('keydown'));
 
-        expect(elements._viewport.getAttribute('tabindex')).toBe(null);
+        expect(elements._viewport.getAttribute('tabindex')).toBe('123');
       });
     });