diff --git a/Userland/Libraries/LibWeb/DOM/Document.cpp b/Userland/Libraries/LibWeb/DOM/Document.cpp
index 0a7abe12b0..68d49fe134 100644
--- a/Userland/Libraries/LibWeb/DOM/Document.cpp
+++ b/Userland/Libraries/LibWeb/DOM/Document.cpp
@@ -16,6 +16,7 @@
 #include <LibJS/Runtime/Array.h>
 #include <LibJS/Runtime/FunctionObject.h>
 #include <LibJS/Runtime/NativeFunction.h>
+#include <LibWeb/Animations/DocumentTimeline.h>
 #include <LibWeb/Bindings/MainThreadVM.h>
 #include <LibWeb/CSS/MediaQueryList.h>
 #include <LibWeb/CSS/MediaQueryListEvent.h>
@@ -383,6 +384,8 @@ void Document::visit_edges(Cell::Visitor& visitor)
     visitor.visit(m_lazy_load_intersection_observer);
     visitor.visit(m_visual_viewport);
 
+    visitor.visit(m_default_timeline);
+
     for (auto& script : m_scripts_to_execute_when_parsing_has_finished)
         visitor.visit(script);
     for (auto& script : m_scripts_to_execute_as_soon_as_possible)
@@ -3560,4 +3563,13 @@ HashMap<AK::URL, HTML::SharedImageRequest*>& Document::shared_image_requests()
     return m_shared_image_requests;
 }
 
+// https://www.w3.org/TR/web-animations-1/#dom-document-timeline
+JS::NonnullGCPtr<Animations::DocumentTimeline> Document::timeline()
+{
+    // The DocumentTimeline object representing the default document timeline.
+    if (!m_default_timeline)
+        m_default_timeline = Animations::DocumentTimeline::create(realm(), *this, static_cast<double>(MonotonicTime::now().milliseconds()));
+    return *m_default_timeline;
+}
+
 }
diff --git a/Userland/Libraries/LibWeb/DOM/Document.h b/Userland/Libraries/LibWeb/DOM/Document.h
index 311514f5ca..f04482aa5e 100644
--- a/Userland/Libraries/LibWeb/DOM/Document.h
+++ b/Userland/Libraries/LibWeb/DOM/Document.h
@@ -534,6 +534,8 @@ public:
 
     HashMap<AK::URL, HTML::SharedImageRequest*>& shared_image_requests();
 
+    JS::NonnullGCPtr<Animations::DocumentTimeline> timeline();
+
 protected:
     virtual void initialize(JS::Realm&) override;
     virtual void visit_edges(Cell::Visitor&) override;
@@ -740,6 +742,9 @@ private:
     JS::GCPtr<HTML::SessionHistoryEntry> m_latest_entry;
 
     HashMap<AK::URL, HTML::SharedImageRequest*> m_shared_image_requests;
+
+    // https://www.w3.org/TR/web-animations-1/#document-default-document-timeline
+    JS::GCPtr<Animations::DocumentTimeline> m_default_timeline;
 };
 
 template<>
diff --git a/Userland/Libraries/LibWeb/DOM/Document.idl b/Userland/Libraries/LibWeb/DOM/Document.idl
index a2d285b1c4..322f29e245 100644
--- a/Userland/Libraries/LibWeb/DOM/Document.idl
+++ b/Userland/Libraries/LibWeb/DOM/Document.idl
@@ -1,3 +1,4 @@
+#import <Animations/DocumentTimeline.idl>
 #import <CSS/StyleSheetList.idl>
 #import <DOM/Comment.idl>
 #import <DOM/DOMImplementation.idl>
@@ -112,6 +113,9 @@ interface Document : Node {
     [NewObject] TreeWalker createTreeWalker(Node root, optional unsigned long whatToShow = 0xFFFFFFFF, optional NodeFilter? filter = null);
 
     Selection? getSelection();
+
+    // https://www.w3.org/TR/web-animations-1/#extensions-to-the-document-interface
+    readonly attribute DocumentTimeline timeline;
 };
 
 dictionary ElementCreationOptions {