diff --git a/Tests/LibWeb/Text/expected/all-window-properties.txt b/Tests/LibWeb/Text/expected/all-window-properties.txt
index b377c043e14..d48e72a3729 100644
--- a/Tests/LibWeb/Text/expected/all-window-properties.txt
+++ b/Tests/LibWeb/Text/expected/all-window-properties.txt
@@ -383,12 +383,14 @@ XMLHttpRequest
 XMLHttpRequestEventTarget
 XMLHttpRequestUpload
 XMLSerializer
+__finishTest
 __preventMultipleTestFunctions
 animationFrame
 asyncTest
 printElement
 println
 promiseTest
+spoofCurrentURL
 test
 timeout
 webkitURL
diff --git a/Tests/LibWeb/Text/input/include.js b/Tests/LibWeb/Text/input/include.js
index 9bf5927da12..92a3820b0a4 100644
--- a/Tests/LibWeb/Text/input/include.js
+++ b/Tests/LibWeb/Text/input/include.js
@@ -1,5 +1,6 @@
 var __outputElement = null;
 let __alreadyCalledTest = false;
+let __originalURL = null;
 function __preventMultipleTestFunctions() {
     if (__alreadyCalledTest) {
         throw new Error("You must only call test() or asyncTest() once per page");
@@ -10,9 +11,24 @@ function __preventMultipleTestFunctions() {
 if (globalThis.internals === undefined) {
     internals = {
         signalTextTestIsDone: function () {},
+        spoofCurrentURL: function (url) {},
     };
 }
 
+function __finishTest() {
+    if (__originalURL) {
+        internals.spoofCurrentURL(__originalURL);
+    }
+    internals.signalTextTestIsDone();
+}
+
+function spoofCurrentURL(url) {
+    if (__originalURL === null) {
+        __originalURL = document.location.href;
+    }
+    internals.spoofCurrentURL(url);
+}
+
 function println(s) {
     __outputElement.appendChild(document.createTextNode(s + "\n"));
 }
@@ -46,14 +62,14 @@ function test(f) {
     __preventMultipleTestFunctions();
     document.addEventListener("DOMContentLoaded", f);
     window.addEventListener("load", () => {
-        internals.signalTextTestIsDone();
+        __finishTest();
     });
 }
 
 function asyncTest(f) {
     const done = () => {
         __preventMultipleTestFunctions();
-        internals.signalTextTestIsDone();
+        __finishTest();
     };
     document.addEventListener("DOMContentLoaded", () => {
         f(done);
@@ -64,7 +80,7 @@ function promiseTest(f) {
     document.addEventListener("DOMContentLoaded", () => {
         f().then(() => {
             __preventMultipleTestFunctions();
-            internals.signalTextTestIsDone();
+            __finishTest();
         });
     });
 }
diff --git a/Userland/Libraries/LibWeb/Internals/Internals.cpp b/Userland/Libraries/LibWeb/Internals/Internals.cpp
index 9e7cc2fb5f3..a765a5bcf65 100644
--- a/Userland/Libraries/LibWeb/Internals/Internals.cpp
+++ b/Userland/Libraries/LibWeb/Internals/Internals.cpp
@@ -10,6 +10,7 @@
 #include <LibWeb/DOM/Document.h>
 #include <LibWeb/DOM/Event.h>
 #include <LibWeb/DOM/EventTarget.h>
+#include <LibWeb/DOMURL/DOMURL.h>
 #include <LibWeb/HTML/BrowsingContext.h>
 #include <LibWeb/HTML/HTMLElement.h>
 #include <LibWeb/HTML/Window.h>
@@ -136,6 +137,19 @@ WebIDL::ExceptionOr<bool> Internals::dispatch_user_activated_event(DOM::EventTar
     return target.dispatch_event(event);
 }
 
+void Internals::spoof_current_url(String const& url_string)
+{
+    auto url = DOMURL::parse(url_string);
+
+    VERIFY(url.is_valid());
+
+    auto origin = DOMURL::url_origin(url);
+
+    auto& window = internals_window();
+    window.associated_document().set_url(url);
+    window.associated_document().set_origin(origin);
+}
+
 JS::NonnullGCPtr<InternalAnimationTimeline> Internals::create_internal_animation_timeline()
 {
     auto& realm = this->realm();
diff --git a/Userland/Libraries/LibWeb/Internals/Internals.h b/Userland/Libraries/LibWeb/Internals/Internals.h
index 03a338c4839..c814c1491ca 100644
--- a/Userland/Libraries/LibWeb/Internals/Internals.h
+++ b/Userland/Libraries/LibWeb/Internals/Internals.h
@@ -35,6 +35,8 @@ public:
 
     WebIDL::ExceptionOr<bool> dispatch_user_activated_event(DOM::EventTarget&, DOM::Event& event);
 
+    void spoof_current_url(String const& url);
+
     JS::NonnullGCPtr<InternalAnimationTimeline> create_internal_animation_timeline();
 
     void simulate_drag_start(double x, double y, String const& name, String const& contents);
diff --git a/Userland/Libraries/LibWeb/Internals/Internals.idl b/Userland/Libraries/LibWeb/Internals/Internals.idl
index 959a34bf093..c851c7937d2 100644
--- a/Userland/Libraries/LibWeb/Internals/Internals.idl
+++ b/Userland/Libraries/LibWeb/Internals/Internals.idl
@@ -19,6 +19,7 @@ interface Internals {
     undefined wheel(double x, double y, double deltaX, double deltaY);
 
     boolean dispatchUserActivatedEvent(EventTarget target, Event event);
+    undefined spoofCurrentURL(USVString url);
 
     InternalAnimationTimeline createInternalAnimationTimeline();