From 802af5ad9da86a78a231a7ba251ac53256622025 Mon Sep 17 00:00:00 2001
From: Andreas Kling <kling@serenityos.org>
Date: Mon, 27 May 2024 13:51:02 +0200
Subject: [PATCH] LibWeb: Allow Element.insertAdjacentHTML on the document
 element

This fixes wpt/domparsing/insert_adjacent_html.html
---
 .../HTML/Element-insertAdjacentHTML-documentElement.txt    | 1 +
 .../HTML/Element-insertAdjacentHTML-documentElement.html   | 7 +++++++
 Userland/Libraries/LibWeb/DOM/Element.cpp                  | 3 +--
 3 files changed, 9 insertions(+), 2 deletions(-)
 create mode 100644 Tests/LibWeb/Text/expected/HTML/Element-insertAdjacentHTML-documentElement.txt
 create mode 100644 Tests/LibWeb/Text/input/HTML/Element-insertAdjacentHTML-documentElement.html

diff --git a/Tests/LibWeb/Text/expected/HTML/Element-insertAdjacentHTML-documentElement.txt b/Tests/LibWeb/Text/expected/HTML/Element-insertAdjacentHTML-documentElement.txt
new file mode 100644
index 00000000000..aaecaf93c4a
--- /dev/null
+++ b/Tests/LibWeb/Text/expected/HTML/Element-insertAdjacentHTML-documentElement.txt
@@ -0,0 +1 @@
+PASS (didn't crash)
diff --git a/Tests/LibWeb/Text/input/HTML/Element-insertAdjacentHTML-documentElement.html b/Tests/LibWeb/Text/input/HTML/Element-insertAdjacentHTML-documentElement.html
new file mode 100644
index 00000000000..66de31038f9
--- /dev/null
+++ b/Tests/LibWeb/Text/input/HTML/Element-insertAdjacentHTML-documentElement.html
@@ -0,0 +1,7 @@
+<script src="../include.js"></script>
+<script>
+    test(() => {
+        document.documentElement.insertAdjacentHTML("afterbegin", "hello");
+        println("PASS (didn't crash)");
+    });
+</script>
diff --git a/Userland/Libraries/LibWeb/DOM/Element.cpp b/Userland/Libraries/LibWeb/DOM/Element.cpp
index ebb3793e93c..6174f6d57eb 100644
--- a/Userland/Libraries/LibWeb/DOM/Element.cpp
+++ b/Userland/Libraries/LibWeb/DOM/Element.cpp
@@ -1489,8 +1489,7 @@ WebIDL::ExceptionOr<void> Element::insert_adjacent_html(String const& position,
         || (context->document().document_type() == Document::Type::HTML
             && static_cast<Element const&>(*context).local_name() == "html"sv
             && static_cast<Element const&>(*context).namespace_uri() == Namespace::HTML)) {
-        // FIXME: set context to the result of creating an element given this's node document, body, and the HTML namespace.
-        TODO();
+        context = TRY(create_element(document(), HTML::TagNames::body, Namespace::HTML));
     }
 
     // 4. Let fragment be the result of invoking the fragment parsing algorithm steps with context and string.