LibWeb: Implement BarProp properties for Window

Author: https://github.com/Totto16
Commit: b66e7ac1ba
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/3810
Reviewed-by: https://github.com/ADKaster
Reviewed-by: https://github.com/AtkinsSJ
Reviewed-by: https://github.com/tcl3 ✅

Libraries/LibWeb/HTML/BarProp.h

@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) 2025, the Ladybird developers.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <LibGC/CellAllocator.h>
+#include <LibWeb/Bindings/PlatformObject.h>
+#include <LibWeb/Forward.h>
+#include <LibWeb/WebIDL/Types.h>
+
+namespace Web::HTML {
+
+// https://html.spec.whatwg.org/multipage/nav-history-apis.html#barprop
+class BarProp : public Bindings::PlatformObject {
+    WEB_PLATFORM_OBJECT(BarProp, Bindings::PlatformObject);
+    GC_DECLARE_ALLOCATOR(BarProp);
+
+public:
+    BarProp(JS::Realm&);
+    static GC::Ref<BarProp> create(JS::Realm&);
+
+    [[nodiscard]] bool visible() const;
+
+private:
+    virtual void initialize(JS::Realm&) override;
+};
+}