diff --git a/Tests/LibWeb/Text/expected/IntersectionObserver/implicit-root-after-originating-iframe-is-removed-from-dom.txt b/Tests/LibWeb/Text/expected/IntersectionObserver/implicit-root-after-originating-iframe-is-removed-from-dom.txt
new file mode 100644
index 0000000000..af663e86b6
--- /dev/null
+++ b/Tests/LibWeb/Text/expected/IntersectionObserver/implicit-root-after-originating-iframe-is-removed-from-dom.txt
@@ -0,0 +1 @@
+    PASS if we didn't crash!
diff --git a/Tests/LibWeb/Text/input/IntersectionObserver/implicit-root-after-originating-iframe-is-removed-from-dom.html b/Tests/LibWeb/Text/input/IntersectionObserver/implicit-root-after-originating-iframe-is-removed-from-dom.html
new file mode 100644
index 0000000000..417a1d3136
--- /dev/null
+++ b/Tests/LibWeb/Text/input/IntersectionObserver/implicit-root-after-originating-iframe-is-removed-from-dom.html
@@ -0,0 +1,17 @@
+<body>
+<iframe></iframe>
+<script src="../include.js"></script>
+<script>
+    asyncTest(done => {
+        let iframe = document.querySelector("iframe");
+        iframe.src =
+            "data:text/html," +
+            encodeURI("<script>new IntersectionObserver(function() { }, { })<" + "/script>");
+        iframe.onload = function () {
+            iframe.remove();
+            done();
+            println("PASS if we didn't crash!");
+        };
+    });
+</script>
+</body>
diff --git a/Userland/Libraries/LibWeb/IntersectionObserver/IntersectionObserver.cpp b/Userland/Libraries/LibWeb/IntersectionObserver/IntersectionObserver.cpp
index 29d29c6f0d..28e4c73367 100644
--- a/Userland/Libraries/LibWeb/IntersectionObserver/IntersectionObserver.cpp
+++ b/Userland/Libraries/LibWeb/IntersectionObserver/IntersectionObserver.cpp
@@ -11,6 +11,7 @@
 #include <LibWeb/HTML/TraversableNavigable.h>
 #include <LibWeb/HTML/Window.h>
 #include <LibWeb/IntersectionObserver/IntersectionObserver.h>
+#include <LibWeb/Page/Page.h>
 
 namespace Web::IntersectionObserver {
 
@@ -156,11 +157,16 @@ Variant<JS::Handle<DOM::Element>, JS::Handle<DOM::Document>, Empty> Intersection
     return m_root.value();
 }
 
+// https://www.w3.org/TR/intersection-observer/#intersectionobserver-intersection-root
 Variant<JS::Handle<DOM::Element>, JS::Handle<DOM::Document>> IntersectionObserver::intersection_root() const
 {
-    if (!m_root.has_value())
-        return JS::make_handle(global_object().navigable()->traversable_navigable()->active_document());
-    return m_root.value();
+    // The intersection root for an IntersectionObserver is the value of its root attribute
+    // if the attribute is non-null;
+    if (m_root.has_value())
+        return m_root.value();
+
+    // otherwise, it is the top-level browsing context’s document node, referred to as the implicit root.
+    return JS::make_handle(global_object().page().top_level_browsing_context().active_document());
 }
 
 // https://www.w3.org/TR/intersection-observer/#intersectionobserver-root-intersection-rectangle
