From 40f7cab21ea542828f17a798c73d937bb31aac39 Mon Sep 17 00:00:00 2001
From: Sam Atkins <atkinssj@serenityos.org>
Date: Mon, 18 Dec 2023 14:00:30 +0000
Subject: [PATCH] LibWeb: Implement
 Document::populate_with_html_head_and_body()

---
 Userland/Libraries/LibWeb/DOM/Document.cpp | 24 ++++++++++++++++++++++
 Userland/Libraries/LibWeb/DOM/Document.h   |  2 ++
 2 files changed, 26 insertions(+)

diff --git a/Userland/Libraries/LibWeb/DOM/Document.cpp b/Userland/Libraries/LibWeb/DOM/Document.cpp
index 7d6b85e201..ae3711f799 100644
--- a/Userland/Libraries/LibWeb/DOM/Document.cpp
+++ b/Userland/Libraries/LibWeb/DOM/Document.cpp
@@ -352,6 +352,30 @@ void Document::initialize(JS::Realm& realm)
     m_list_of_available_images = heap().allocate<HTML::ListOfAvailableImages>(realm);
 }
 
+// https://html.spec.whatwg.org/multipage/document-lifecycle.html#populate-with-html/head/body
+WebIDL::ExceptionOr<void> Document::populate_with_html_head_and_body()
+{
+    // 1. Let html be the result of creating an element given document, html, and the HTML namespace.
+    auto html = TRY(DOM::create_element(*this, HTML::TagNames::html, Namespace::HTML));
+
+    // 2. Let head be the result of creating an element given document, head, and the HTML namespace.
+    auto head = TRY(DOM::create_element(*this, HTML::TagNames::head, Namespace::HTML));
+
+    // 3. Let body be the result of creating an element given document, body, and the HTML namespace.
+    auto body = TRY(DOM::create_element(*this, HTML::TagNames::body, Namespace::HTML));
+
+    // 4. Append html to document.
+    TRY(append_child(html));
+
+    // 5. Append head to html.
+    TRY(html->append_child(head));
+
+    // 6. Append body to html.
+    TRY(html->append_child(body));
+
+    return {};
+}
+
 void Document::visit_edges(Cell::Visitor& visitor)
 {
     Base::visit_edges(visitor);
diff --git a/Userland/Libraries/LibWeb/DOM/Document.h b/Userland/Libraries/LibWeb/DOM/Document.h
index 97126d384e..fb93147bcb 100644
--- a/Userland/Libraries/LibWeb/DOM/Document.h
+++ b/Userland/Libraries/LibWeb/DOM/Document.h
@@ -96,6 +96,8 @@ public:
     static WebIDL::ExceptionOr<JS::NonnullGCPtr<Document>> construct_impl(JS::Realm&);
     virtual ~Document() override;
 
+    WebIDL::ExceptionOr<void> populate_with_html_head_and_body();
+
     JS::GCPtr<Selection::Selection> get_selection() const;
 
     String cookie(Cookie::Source = Cookie::Source::NonHttp);