From 0a989d1bfd6627ec453a9a0863508261adcd4884 Mon Sep 17 00:00:00 2001
From: Luke Wilde <lukew@serenityos.org>
Date: Sun, 19 Jun 2022 15:45:09 +0100
Subject: [PATCH] LibWeb: Implement HTMLBaseElement.href

---
 .../Libraries/LibWeb/HTML/HTMLBaseElement.cpp | 30 +++++++++++++++++++
 .../Libraries/LibWeb/HTML/HTMLBaseElement.h   |  3 ++
 .../Libraries/LibWeb/HTML/HTMLBaseElement.idl |  1 +
 3 files changed, 34 insertions(+)

diff --git a/Userland/Libraries/LibWeb/HTML/HTMLBaseElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLBaseElement.cpp
index b5008f41e6..afb6d0e292 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLBaseElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLBaseElement.cpp
@@ -63,4 +63,34 @@ void HTMLBaseElement::set_the_frozen_base_url()
     m_frozen_base_url = move(url_record);
 }
 
+// https://html.spec.whatwg.org/multipage/semantics.html#dom-base-href
+String HTMLBaseElement::href() const
+{
+    // 1. Let document be element's node document.
+    auto& document = this->document();
+
+    // 2. Let url be the value of the href attribute of this element, if it has one, and the empty string otherwise.
+    auto url = String::empty();
+    if (has_attribute(AttributeNames::href))
+        url = attribute(AttributeNames::href);
+
+    // 3. Let urlRecord be the result of parsing url with document's fallback base URL, and document's character encoding. (Thus, the base element isn't affected by other base elements or itself.)
+    // FIXME: Pass in document's character encoding.
+    auto url_record = document.fallback_base_url().complete_url(url);
+
+    // 4. If urlRecord is failure, return url.
+    if (!url_record.is_valid())
+        return url;
+
+    // 5. Return the serialization of urlRecord.
+    return url_record.to_string();
+}
+
+// https://html.spec.whatwg.org/multipage/semantics.html#dom-base-href
+void HTMLBaseElement::set_href(String const& href)
+{
+    // The href IDL attribute, on setting, must set the href content attribute to the given new value.
+    set_attribute(AttributeNames::href, href);
+}
+
 }
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLBaseElement.h b/Userland/Libraries/LibWeb/HTML/HTMLBaseElement.h
index 40d7bd3525..13afb78cfc 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLBaseElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLBaseElement.h
@@ -17,6 +17,9 @@ public:
     HTMLBaseElement(DOM::Document&, DOM::QualifiedName);
     virtual ~HTMLBaseElement() override;
 
+    String href() const;
+    void set_href(String const& href);
+
     AK::URL const& frozen_base_url() const { return m_frozen_base_url; }
 
     virtual void inserted() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLBaseElement.idl b/Userland/Libraries/LibWeb/HTML/HTMLBaseElement.idl
index 6e227d64b9..43c4bc80d9 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLBaseElement.idl
+++ b/Userland/Libraries/LibWeb/HTML/HTMLBaseElement.idl
@@ -2,6 +2,7 @@
 
 interface HTMLBaseElement : HTMLElement {
 
+    [CEReactions] attribute USVString href;
     [Reflect] attribute DOMString target;
 
 };