diff -r 48c4eec2b7e6 -r 8c2e4d02f4ef wp/wp-includes/js/dist/vendor/wp-polyfill-inert.js
--- a/wp/wp-includes/js/dist/vendor/wp-polyfill-inert.js	Fri Sep 05 18:40:08 2025 +0200
+++ b/wp/wp-includes/js/dist/vendor/wp-polyfill-inert.js	Fri Sep 05 18:52:52 2025 +0200
@@ -15,7 +15,7 @@
 
   (function () {
     // Return early if we're not running inside of the browser.
-    if (typeof window === 'undefined') {
+    if (typeof window === 'undefined' || typeof Element === 'undefined') {
       return;
     }
 
@@ -30,7 +30,7 @@
     var matches = Element.prototype.matches || Element.prototype.msMatchesSelector;
 
     /** @type {string} */
-    var _focusableElementsString = ['a[href]', 'area[href]', 'input:not([disabled])', 'select:not([disabled])', 'textarea:not([disabled])', 'button:not([disabled])', 'details', 'summary', 'iframe', 'object', 'embed', '[contenteditable]'].join(',');
+    var _focusableElementsString = ['a[href]', 'area[href]', 'input:not([disabled])', 'select:not([disabled])', 'textarea:not([disabled])', 'button:not([disabled])', 'details', 'summary', 'iframe', 'object', 'embed', 'video', '[contenteditable]'].join(',');
 
     /**
      * `InertRoot` manages a single inert subtree, i.e. a DOM subtree whose root element has an `inert`