diff --git a/Userland/Libraries/LibWeb/DOM/Document.cpp b/Userland/Libraries/LibWeb/DOM/Document.cpp
index 237efce65c0..b55d3564aac 100644
--- a/Userland/Libraries/LibWeb/DOM/Document.cpp
+++ b/Userland/Libraries/LibWeb/DOM/Document.cpp
@@ -323,6 +323,7 @@ void Document::visit_edges(Cell::Visitor& visitor)
     visitor.visit(m_links);
     visitor.visit(m_forms);
     visitor.visit(m_scripts);
+    visitor.visit(m_all);
 
     for (auto& script : m_scripts_to_execute_when_parsing_has_finished)
         visitor.visit(script.ptr());
@@ -1041,6 +1042,17 @@ JS::NonnullGCPtr<HTMLCollection> Document::scripts()
     return *m_scripts;
 }
 
+// https://html.spec.whatwg.org/multipage/dom.html#dom-document-all
+JS::NonnullGCPtr<HTMLCollection> Document::all()
+{
+    if (!m_all) {
+        m_all = HTMLCollection::create(*this, [](Element const&) {
+            return true;
+        });
+    }
+    return *m_all;
+}
+
 Color Document::link_color() const
 {
     if (m_link_color.has_value())
diff --git a/Userland/Libraries/LibWeb/DOM/Document.h b/Userland/Libraries/LibWeb/DOM/Document.h
index 6f5b1496a1d..d7ae5324781 100644
--- a/Userland/Libraries/LibWeb/DOM/Document.h
+++ b/Userland/Libraries/LibWeb/DOM/Document.h
@@ -183,6 +183,7 @@ public:
     JS::NonnullGCPtr<HTMLCollection> links();
     JS::NonnullGCPtr<HTMLCollection> forms();
     JS::NonnullGCPtr<HTMLCollection> scripts();
+    JS::NonnullGCPtr<HTMLCollection> all();
 
     String const& source() const { return m_source; }
     void set_source(String const& source) { m_source = source; }
@@ -494,6 +495,7 @@ private:
     JS::GCPtr<HTMLCollection> m_links;
     JS::GCPtr<HTMLCollection> m_forms;
     JS::GCPtr<HTMLCollection> m_scripts;
+    JS::GCPtr<HTMLCollection> m_all;
 };
 
 }
diff --git a/Userland/Libraries/LibWeb/DOM/Document.idl b/Userland/Libraries/LibWeb/DOM/Document.idl
index a7d979c220b..f4790688728 100644
--- a/Userland/Libraries/LibWeb/DOM/Document.idl
+++ b/Userland/Libraries/LibWeb/DOM/Document.idl
@@ -69,6 +69,9 @@ interface Document : Node {
     readonly attribute HTMLCollection forms;
     readonly attribute HTMLCollection scripts;
 
+    // FIXME: Should return an HTMLAllCollection
+    readonly attribute HTMLCollection all;
+
     Element createElement(DOMString tagName);
     Element createElementNS(DOMString? namespace, DOMString qualifiedName);
     DocumentFragment createDocumentFragment();