diff --git a/packages/docusaurus-theme-classic/package.json b/packages/docusaurus-theme-classic/package.json
index 0eb68a49b41d..6602523d71ef 100644
--- a/packages/docusaurus-theme-classic/package.json
+++ b/packages/docusaurus-theme-classic/package.json
@@ -27,6 +27,7 @@
     "prop-types": "^15.7.2",
     "react-router-dom": "^5.1.2",
     "react-toggle": "^4.1.1",
+    "use-onclickoutside": "^0.3.1",
     "@docusaurus/utils-validation": "^2.0.0-alpha.61"
   },
   "devDependencies": {
diff --git a/packages/docusaurus-theme-classic/src/theme/NavbarItem/DefaultNavbarItem.tsx b/packages/docusaurus-theme-classic/src/theme/NavbarItem/DefaultNavbarItem.tsx
index 80659c6d0e3e..e1bbe0e822a1 100644
--- a/packages/docusaurus-theme-classic/src/theme/NavbarItem/DefaultNavbarItem.tsx
+++ b/packages/docusaurus-theme-classic/src/theme/NavbarItem/DefaultNavbarItem.tsx
@@ -5,10 +5,11 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-import React, {ComponentProps, ComponentType} from 'react';
+import React, {ComponentProps, ComponentType, useState} from 'react';
 import clsx from 'clsx';
 import Link from '@docusaurus/Link';
 import useBaseUrl from '@docusaurus/useBaseUrl';
+import useOnClickOutside from 'use-onclickoutside';
 
 function NavLink({
   activeBasePath,
@@ -33,6 +34,7 @@ function NavLink({
   const toUrl = useBaseUrl(to);
   const activeBaseUrl = useBaseUrl(activeBasePath);
   const normalizedHref = useBaseUrl(href, {forcePrependBaseUrl: true});
+
   return (
     <Link
       {...(href
@@ -61,6 +63,21 @@ function NavLink({
 }
 
 function NavItemDesktop({items, position, className, ...props}) {
+  const dropDownRef = React.useRef<HTMLDivElement>(null);
+  const dropDownMenuRef = React.useRef<HTMLUListElement>(null);
+  const [showDropDown, setShowDropDown] = useState(false);
+  useOnClickOutside(dropDownRef, () => toggle(false));
+  function toggle(state: boolean) {
+    if (state) {
+      const firstNavLinkOfULElement =
+        dropDownMenuRef?.current?.firstChild?.firstChild;
+
+      if (firstNavLinkOfULElement) {
+        (firstNavLinkOfULElement as HTMLElement).focus();
+      }
+    }
+    setShowDropDown(state);
+  }
   const navLinkClassNames = (extraClassName, isDropdownItem = false) =>
     clsx(
       {
@@ -76,32 +93,34 @@ function NavItemDesktop({items, position, className, ...props}) {
 
   return (
     <div
+      ref={dropDownRef}
       className={clsx('navbar__item', 'dropdown', 'dropdown--hoverable', {
         'dropdown--left': position === 'left',
         'dropdown--right': position === 'right',
+        'dropdown--show': showDropDown,
       })}>
       <NavLink
         className={navLinkClassNames(className)}
         {...props}
         onClick={props.to ? undefined : (e) => e.preventDefault()}
         onKeyDown={(e) => {
-          function toggle() {
-            ((e.target as HTMLElement)
-              .parentNode as HTMLElement).classList.toggle('dropdown--show');
-          }
-          if (e.key === 'Enter' && !props.to) {
-            toggle();
-          }
-          if (e.key === 'Tab') {
-            toggle();
+          if ((e.key === 'Enter' && !props.to) || e.key === 'Tab') {
+            e.preventDefault();
+            toggle(true);
           }
         }}>
         {props.label}
       </NavLink>
-      <ul className="dropdown__menu">
+      <ul ref={dropDownMenuRef} className="dropdown__menu">
         {items.map(({className: childItemClassName, ...childItemProps}, i) => (
           <li key={i}>
             <NavLink
+              onKeyDown={(e) => {
+                if (i === items.length - 1 && e.key === 'Tab') {
+                  e.preventDefault();
+                  toggle(false);
+                }
+              }}
               activeClassName="dropdown__link--active"
               className={navLinkClassNames(childItemClassName, true)}
               {...childItemProps}
diff --git a/yarn.lock b/yarn.lock
index 4cdfbdeae7de..3a4f32a547e6 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -4947,6 +4947,11 @@ archiver@^4.0.0:
     tar-stream "^2.1.2"
     zip-stream "^3.0.1"
 
+are-passive-events-supported@^1.1.0:
+  version "1.1.1"
+  resolved "https://registry.yarnpkg.com/are-passive-events-supported/-/are-passive-events-supported-1.1.1.tgz#3db180a1753a2186a2de50a32cded3ac0979f5dc"
+  integrity sha512-5wnvlvB/dTbfrCvJ027Y4L4gW/6Mwoy1uFSavney0YO++GU+0e/flnjiBBwH+1kh7xNCgCOGvmJC3s32joYbww==
+
 are-we-there-yet@~1.1.2:
   version "1.1.5"
   resolved "https://registry.yarnpkg.com/are-we-there-yet/-/are-we-there-yet-1.1.5.tgz#4b35c2944f062a8bfcda66410760350fe9ddfc21"
@@ -21105,6 +21110,26 @@ url@^0.11.0:
     punycode "1.3.2"
     querystring "0.2.0"
 
+use-isomorphic-layout-effect@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/use-isomorphic-layout-effect/-/use-isomorphic-layout-effect-1.0.0.tgz#f56b4ed633e1c21cd9fc76fe249002a1c28989fb"
+  integrity sha512-JMwJ7Vd86NwAt1jH7q+OIozZSIxA4ND0fx6AsOe2q1H8ooBUp5aN6DvVCqZiIaYU6JaMRJGyR0FO7EBCIsb/Rg==
+
+use-latest@^1.0.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/use-latest/-/use-latest-1.1.0.tgz#7bf9684555869c3f5f37e10d0884c8accf4d3aa6"
+  integrity sha512-gF04d0ZMV3AMB8Q7HtfkAWe+oq1tFXP6dZKwBHQF5nVXtGsh2oAYeeqma5ZzxtlpOcW8Ro/tLcfmEodjDeqtuw==
+  dependencies:
+    use-isomorphic-layout-effect "^1.0.0"
+
+use-onclickoutside@^0.3.1:
+  version "0.3.1"
+  resolved "https://registry.yarnpkg.com/use-onclickoutside/-/use-onclickoutside-0.3.1.tgz#fdd723a6a499046b6bc761e4a03af432eee5917b"
+  integrity sha512-aahvbW5+G0XJfzj31FJeLsvc6qdKbzeTsQ8EtkHHq5qTg6bm/qkJeKLcgrpnYeHDDbd7uyhImLGdkbM9BRzOHQ==
+  dependencies:
+    are-passive-events-supported "^1.1.0"
+    use-latest "^1.0.0"
+
 use@^3.1.0:
   version "3.1.1"
   resolved "https://registry.yarnpkg.com/use/-/use-3.1.1.tgz#d50c8cac79a19fbc20f2911f56eb973f4e10070f"