diff --git a/Libraries/LibWeb/DOM/Document.cpp b/Libraries/LibWeb/DOM/Document.cpp
index 8f5e387a71b..c274b06d646 100644
--- a/Libraries/LibWeb/DOM/Document.cpp
+++ b/Libraries/LibWeb/DOM/Document.cpp
@@ -840,7 +840,7 @@ GC::Ptr<HTML::WindowProxy const> Document::default_view() const
 
 URL::Origin const& Document::origin() const
 {
-    return m_origin;
+    return m_origin.value();
 }
 
 void Document::set_origin(URL::Origin const& origin)
diff --git a/Libraries/LibWeb/DOM/Document.h b/Libraries/LibWeb/DOM/Document.h
index 1c030d453aa..c704c5d80f7 100644
--- a/Libraries/LibWeb/DOM/Document.h
+++ b/Libraries/LibWeb/DOM/Document.h
@@ -1103,7 +1103,7 @@ private:
     String m_referrer;
 
     // https://dom.spec.whatwg.org/#concept-document-origin
-    URL::Origin m_origin;
+    Optional<URL::Origin> m_origin;
 
     GC::Ptr<HTMLCollection> m_applets;
     GC::Ptr<HTMLCollection> m_anchors;
diff --git a/Libraries/LibWeb/HTML/Parser/HTMLParser.cpp b/Libraries/LibWeb/HTML/Parser/HTMLParser.cpp
index 325d461c176..ffedc4cf340 100644
--- a/Libraries/LibWeb/HTML/Parser/HTMLParser.cpp
+++ b/Libraries/LibWeb/HTML/Parser/HTMLParser.cpp
@@ -4570,6 +4570,11 @@ Vector<GC::Root<DOM::Node>> HTMLParser::parse_html_fragment(DOM::Element& contex
     //         This is required for Document::parse_url() to work inside iframe srcdoc documents.
     temp_document->set_about_base_url(context_element.document().about_base_url());
 
+    // AD-HOC: The origin is not otherwise set for the document, but it may be accessed during parsing
+    //         script. For now, let's just use an opaque origin, but it is likely that the spec is
+    //         missing setting this origin.
+    temp_document->set_origin(URL::Origin {});
+
     // 2. If context's node document is in quirks mode, then set document's mode to "quirks".
     if (context_element.document().in_quirks_mode())
         temp_document->set_quirks_mode(DOM::QuirksMode::Yes);