From 65e0f8184d36a79535197d2d0922f542594a29d4 Mon Sep 17 00:00:00 2001
From: Andreas Kling <kling@serenityos.org>
Date: Sun, 26 Sep 2021 02:03:56 +0200
Subject: [PATCH] LibWeb: Make parser <script> elements delay the document load
 event

---
 Userland/Libraries/LibWeb/HTML/HTMLScriptElement.cpp | 5 +++++
 Userland/Libraries/LibWeb/HTML/HTMLScriptElement.h   | 3 +++
 2 files changed, 8 insertions(+)

diff --git a/Userland/Libraries/LibWeb/HTML/HTMLScriptElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLScriptElement.cpp
index 5034660c55..39a017249f 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLScriptElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLScriptElement.cpp
@@ -31,6 +31,10 @@ HTMLScriptElement::~HTMLScriptElement()
 void HTMLScriptElement::set_parser_document(Badge<HTMLParser>, DOM::Document& document)
 {
     m_parser_document = document;
+
+    // https://html.spec.whatwg.org/multipage/scripting.html#concept-script-script
+    // The user agent must delay the load event of the element's node document until the script is ready.
+    m_document_load_event_delayer.emplace(document);
 }
 
 void HTMLScriptElement::set_non_blocking(Badge<HTMLParser>, bool non_blocking)
@@ -437,6 +441,7 @@ void HTMLScriptElement::prepare_script()
 void HTMLScriptElement::script_became_ready()
 {
     m_script_ready = true;
+    m_document_load_event_delayer.clear();
     if (!m_script_ready_callback)
         return;
     m_script_ready_callback();
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLScriptElement.h b/Userland/Libraries/LibWeb/HTML/HTMLScriptElement.h
index 6c8521b5f1..f034c4f0bd 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLScriptElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLScriptElement.h
@@ -7,6 +7,7 @@
 #pragma once
 
 #include <AK/Function.h>
+#include <LibWeb/DOM/DocumentLoadEventDelayer.h>
 #include <LibWeb/HTML/HTMLElement.h>
 #include <LibWeb/HTML/Scripting/Script.h>
 
@@ -63,6 +64,8 @@ private:
     Function<void()> m_script_ready_callback;
 
     RefPtr<Script> m_script;
+
+    Optional<DOM::DocumentLoadEventDelayer> m_document_load_event_delayer;
 };
 
 }