diff --git a/Tests/LibWeb/Text/expected/Element-offsetParent-of-iframe.txt b/Tests/LibWeb/Text/expected/Element-offsetParent-of-iframe.txt
new file mode 100644
index 00000000000..4c43e847960
--- /dev/null
+++ b/Tests/LibWeb/Text/expected/Element-offsetParent-of-iframe.txt
@@ -0,0 +1 @@
+iframe offsetParent value: null
diff --git a/Tests/LibWeb/Text/input/Element-offsetParent-of-iframe.html b/Tests/LibWeb/Text/input/Element-offsetParent-of-iframe.html
new file mode 100644
index 00000000000..5bd23ec53a1
--- /dev/null
+++ b/Tests/LibWeb/Text/input/Element-offsetParent-of-iframe.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<script src="include.js"></script>
+<script>
+    function offsetParentOfChildDocument() {
+        const frameDocument = document.querySelector("iframe").contentDocument;
+        const frameRoot = frameDocument.documentElement;
+        document.documentElement.append(frameRoot);
+        document.dispatchEvent(new CustomEvent("offsetParentCalled", { detail: { iframeOffsetParent: frameRoot.offsetParent }}));
+    }
+
+    asyncTest(done => {
+        document.addEventListener("offsetParentCalled", event => {
+            println(`iframe offsetParent value: ${event.detail.iframeOffsetParent}`);
+            done();
+        });
+    });
+</script>
+<iframe srcdoc="
+<script>
+    window.parent.offsetParentOfChildDocument();
+</script>
+">
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLElement.cpp
index 690ed956d51..839e4e838c9 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLElement.cpp
@@ -205,7 +205,8 @@ JS::GCPtr<DOM::Element> HTMLElement::offset_parent() const
             return const_cast<Element*>(ancestor);
     }
 
-    VERIFY_NOT_REACHED();
+    // 3. Return null.
+    return nullptr;
 }
 
 // https://www.w3.org/TR/cssom-view-1/#dom-htmlelement-offsettop
