LibWeb: Implement getting "inclusive ancestor navigables" of a document

Userland/Libraries/LibWeb/DOM/Document.cpp

@@ -2584,6 +2584,19 @@ Vector<JS::Handle<HTML::Navigable>> Document::ancestor_navigables()
     return ancestors;
 }
 
+// https://html.spec.whatwg.org/multipage/document-sequences.html#inclusive-ancestor-navigables
+Vector<JS::Handle<HTML::Navigable>> Document::inclusive_ancestor_navigables()
+{
+    // 1. Let navigables be document's ancestor navigables.
+    auto navigables = ancestor_navigables();
+
+    // 2. Append document's node navigable to navigables.
+    navigables.append(*navigable());
+
+    // 3. Return navigables.
+    return navigables;
+}
+
 // https://html.spec.whatwg.org/multipage/browsers.html#list-of-the-descendant-browsing-contexts
 Vector<JS::Handle<HTML::BrowsingContext>> Document::list_of_descendant_browsing_contexts() const
 {

Userland/Libraries/LibWeb/DOM/Document.h

@@ -463,6 +463,7 @@ public:
     Vector<JS::Handle<HTML::Navigable>> descendant_navigables();
     Vector<JS::Handle<HTML::Navigable>> inclusive_descendant_navigables();
     Vector<JS::Handle<HTML::Navigable>> ancestor_navigables();
+    Vector<JS::Handle<HTML::Navigable>> inclusive_ancestor_navigables();
 
     void destroy();