#include <AK/Optional.h>
#include <AK/String.h>
#include <AK/TypeCasts.h>
#include <AK/Utf16FlyString.h>
#include <LibGC/Ptr.h>
#include <LibJS/Runtime/AbstractOperations.h>
#include <LibJS/Runtime/Error.h>
#include <LibJS/Runtime/Realm.h>
#include <LibJS/Runtime/Value.h>
#include <LibJS/Runtime/ValueInlines.h>
#include <LibWeb/Bindings/ExceptionOrUtils.h>
#include <LibWeb/Bindings/HTMLElement.h>
#include <LibWeb/Bindings/HTMLMarqueeElement.h>
#include <LibWeb/Bindings/Intrinsics.h>
#include <LibWeb/Bindings/MainThreadVM.h>
#include <LibWeb/DOM/Document.h>
#include <LibWeb/DOM/Element.h>
#include <LibWeb/DOM/ElementFactory.h>
#include <LibWeb/HTML/CustomElements/CustomElementDefinition.h>
#include <LibWeb/HTML/CustomElements/CustomElementRegistry.h>
#include <LibWeb/HTML/HTMLMarqueeElement.h>
#include <LibWeb/HTML/Numbers.h>
#include <LibWeb/HTML/Scripting/SimilarOriginWindowAgent.h>
#include <LibWeb/HTML/Window.h>
#include <LibWeb/WebIDL/AbstractOperations.h>
#include <LibWeb/WebIDL/Tracing.h>
#include <LibWeb/WebIDL/Types.h>

namespace Web::Bindings {

void HTMLMarqueeElementConstructor::initialize(JS::Realm& realm, JS::NativeFunction& object)
{
    auto& vm = realm.vm();
    [[maybe_unused]] u8 default_attributes = JS::Attribute::Enumerable;

    object.set_prototype(&ensure_web_constructor<HTMLElementPrototype>(realm, "HTMLElement"_fly_string));
    object.define_direct_property(vm.names.length, JS::Value(0), JS::Attribute::Configurable);
    object.define_direct_property(vm.names.name, JS::PrimitiveString::create(vm, "HTMLMarqueeElement"_utf16), JS::Attribute::Configurable);
    object.define_direct_property(vm.names.prototype, &ensure_web_prototype<HTMLMarqueeElementPrototype>(realm, "HTMLMarqueeElement"_fly_string), 0);
}

JS::ThrowCompletionOr<GC::Ref<JS::Object>> HTMLMarqueeElementConstructor::construct([[maybe_unused]] InterfaceConstructor& constructor, [[maybe_unused]] JS::FunctionObject& new_target)
{
    WebIDL::log_trace(constructor.vm(), "HTMLMarqueeElementConstructor::construct");
    auto& vm = constructor.vm();
    auto& realm = *vm.current_realm();
    auto& window = as<HTML::Window>(HTML::current_global_object());

    // 1. If NewTarget is equal to the active function object, then throw a TypeError.
    if (&new_target == vm.active_function_object())
        return vm.throw_completion<JS::TypeError>("Cannot directly construct an HTML element, it must be inherited"_utf16);

    // 2. Let registry be null.
    GC::Ptr<HTML::CustomElementRegistry> registry;

    // 3. If the surrounding agent's active custom element constructor map[NewTarget] exists:
    auto& surrounding_agent = HTML::relevant_similar_origin_window_agent(window);
    if (auto registry_for_constructor = surrounding_agent.active_custom_element_constructor_map.get(GC::Ref { new_target }); registry_for_constructor.has_value() && !registry_for_constructor->is_null()) {
        // 1. Set registry to the surrounding agent's active custom element constructor map[NewTarget].
        registry = registry_for_constructor.value();

        // 2. Remove the surrounding agent's active custom element constructor map[NewTarget].
        surrounding_agent.active_custom_element_constructor_map.remove(GC::Ref { new_target });
    }
    // 4. Otherwise, set registry to current global object's associated Document's custom element registry.
    else {
        registry = window.associated_document().custom_element_registry();
    }

    // 5. Let definition be the item in registry's custom element definition set with constructor equal to NewTarget.
    //    If there is no such item, then throw a TypeError.
    auto definition = registry->get_definition_from_new_target(new_target);
    if (!definition)
        return vm.throw_completion<JS::TypeError>("There is no custom element definition assigned to the given constructor"_utf16);

    // 6. Let isValue be null.
    Optional<Utf16FlyString> is_value;

    // 7. If definition's local name is equal to definition's name (i.e., definition is for an autonomous custom element):
    if (definition->local_name() == definition->name()) {
        // 1. If the active function object is not HTMLElement, then throw a TypeError.
        return vm.throw_completion<JS::TypeError>("Autonomous custom elements can only inherit from HTMLElement"_utf16);
    }
    // 8. Otherwise (i.e., if definition is for a customized built-in element):
    else {
        // 1. Let valid local names be the list of local names for elements defined in this specification or in other applicable specifications that use the active function object as their element interface.
        static auto const& valid_local_names = *new auto(MUST(DOM::valid_local_names_for_given_html_element_interface("HTMLMarqueeElement"sv)));

        // 2. If valid local names does not contain definition's local name, then throw a TypeError.
        if (!valid_local_names.contains_slow(definition->local_name()))
            return vm.throw_completion<JS::TypeError>(Utf16String::formatted("Local name '{}' of customized built-in element is not a valid local name for HTMLMarqueeElement", definition->local_name()));

        // 3. Set isValue to definition's name.
        is_value = definition->name();
    }

    // 9. If definition's construction stack is empty:
    if (definition->construction_stack().is_empty()) {
        // 1. Let element be the result of internally creating a new object implementing the interface to which the active function object corresponds, given the current Realm Record and NewTarget.
        // 2. Set element's node document to the current global object's associated Document.
        // 3. Set element's namespace to the HTML namespace.
        // 4. Set element's namespace prefix to null.
        // 5. Set element's local name to definition's local name.
        auto element = realm.create<HTML::HTMLMarqueeElement>(window.associated_document(), DOM::QualifiedName { definition->local_name(), {}, Namespace::HTML });

        // https://webidl.spec.whatwg.org/#internally-create-a-new-object-implementing-the-interface
        TRY(WebIDL::set_prototype_from_new_target<HTMLMarqueeElementPrototype>(vm, new_target, "HTMLMarqueeElement"_fly_string, *element));

        // 6. Set element's custom element registry to registry.
        element->set_custom_element_registry(registry);

        // 7. Set element's custom element state to "custom".
        // 8. Set element's custom element definition to definition.
        // 9. Set element's is value to isValue.
        element->setup_custom_element_from_constructor(*definition, is_value);

        // 10. Return element.
        return *element;
    }

    // 10. Let prototype be ? Get(NewTarget, "prototype").
    auto prototype = TRY(new_target.get(vm.names.prototype));

    // 11. If Type(prototype) is not Object, then:
    if (!prototype.is_object()) {
        // 1. Let realm be ? GetFunctionRealm(NewTarget).
        auto* function_realm = TRY(JS::get_function_realm(vm, new_target));

        // 2. Set prototype to the interface prototype object of realm whose interface is the same as the interface of the active function object.
        VERIFY(function_realm);
        prototype = &Bindings::ensure_web_prototype<HTMLMarqueeElementPrototype>(*function_realm, "HTMLMarqueeElement"_fly_string);
    }

    VERIFY(prototype.is_object());

    // 12. Let element be the last entry in definition's construction stack.
    auto& element = definition->construction_stack().last();

    // 13. If element is an already constructed marker, then throw a TypeError.
    if (element.has<HTML::AlreadyConstructedCustomElementMarker>())
        return vm.throw_completion<JS::TypeError>("Custom element has already been constructed"_utf16);

    // 14. Perform ? element.[[SetPrototypeOf]](prototype).
    auto actual_element = element.get<GC::Ref<DOM::Element>>();
    TRY(actual_element->internal_set_prototype_of(&prototype.as_object()));

    // 15. Replace the last entry in definition's construction stack with an already constructed marker.
    definition->construction_stack().last() = HTML::AlreadyConstructedCustomElementMarker {};

    // 16. Return element.
    return *actual_element;
}

void HTMLMarqueeElementPrototype::initialize(JS::Realm& realm, JS::Object& object)
{
    [[maybe_unused]] auto& vm = realm.vm();
    [[maybe_unused]] u8 default_attributes = JS::Attribute::Enumerable | JS::Attribute::Configurable | JS::Attribute::Writable;

    object.set_prototype(GC::Ref { ensure_web_prototype<HTMLElementPrototype>(realm, "HTMLElement"_fly_string) });

    auto behavior_id = "behavior"_utf16_fly_string;
    auto native_behavior_getter = JS::NativeFunction::create(realm, behavior_getter, 0, behavior_id, &realm, "get"sv);
    auto native_behavior_setter = JS::NativeFunction::create(realm, behavior_setter, 1, behavior_id, &realm, "set"sv);

    // 4. Let configurable be false if attr is unforgeable and true otherwise.
    auto behavior_attributes = default_attributes;

    // 5. Let desc be the PropertyDescriptor{[[Get]]: getter, [[Set]]: setter, [[Enumerable]]: true, [[Configurable]]: configurable}.

    // 7. Perform ! DefinePropertyOrThrow(target, id, desc).
    object.define_direct_accessor(behavior_id, native_behavior_getter, native_behavior_setter, behavior_attributes);

    // 8. FIXME: If attr’s type is an observable array type with type argument T, then set target’s backing observable array exotic object for attr to the result of creating an observable array exotic object in realm, given T, attr’s set an indexed value algorithm, and attr’s delete an indexed value algorithm.
    auto bg_color_id = "bgColor"_utf16_fly_string;
    auto native_bg_color_getter = JS::NativeFunction::create(realm, bg_color_getter, 0, bg_color_id, &realm, "get"sv);
    auto native_bg_color_setter = JS::NativeFunction::create(realm, bg_color_setter, 1, bg_color_id, &realm, "set"sv);

    // 4. Let configurable be false if attr is unforgeable and true otherwise.
    auto bg_color_attributes = default_attributes;

    // 5. Let desc be the PropertyDescriptor{[[Get]]: getter, [[Set]]: setter, [[Enumerable]]: true, [[Configurable]]: configurable}.

    // 7. Perform ! DefinePropertyOrThrow(target, id, desc).
    object.define_direct_accessor(bg_color_id, native_bg_color_getter, native_bg_color_setter, bg_color_attributes);

    // 8. FIXME: If attr’s type is an observable array type with type argument T, then set target’s backing observable array exotic object for attr to the result of creating an observable array exotic object in realm, given T, attr’s set an indexed value algorithm, and attr’s delete an indexed value algorithm.
    auto direction_id = "direction"_utf16_fly_string;
    auto native_direction_getter = JS::NativeFunction::create(realm, direction_getter, 0, direction_id, &realm, "get"sv);
    auto native_direction_setter = JS::NativeFunction::create(realm, direction_setter, 1, direction_id, &realm, "set"sv);

    // 4. Let configurable be false if attr is unforgeable and true otherwise.
    auto direction_attributes = default_attributes;

    // 5. Let desc be the PropertyDescriptor{[[Get]]: getter, [[Set]]: setter, [[Enumerable]]: true, [[Configurable]]: configurable}.

    // 7. Perform ! DefinePropertyOrThrow(target, id, desc).
    object.define_direct_accessor(direction_id, native_direction_getter, native_direction_setter, direction_attributes);

    // 8. FIXME: If attr’s type is an observable array type with type argument T, then set target’s backing observable array exotic object for attr to the result of creating an observable array exotic object in realm, given T, attr’s set an indexed value algorithm, and attr’s delete an indexed value algorithm.
    auto height_id = "height"_utf16_fly_string;
    auto native_height_getter = JS::NativeFunction::create(realm, height_getter, 0, height_id, &realm, "get"sv);
    auto native_height_setter = JS::NativeFunction::create(realm, height_setter, 1, height_id, &realm, "set"sv);

    // 4. Let configurable be false if attr is unforgeable and true otherwise.
    auto height_attributes = default_attributes;

    // 5. Let desc be the PropertyDescriptor{[[Get]]: getter, [[Set]]: setter, [[Enumerable]]: true, [[Configurable]]: configurable}.

    // 7. Perform ! DefinePropertyOrThrow(target, id, desc).
    object.define_direct_accessor(height_id, native_height_getter, native_height_setter, height_attributes);

    // 8. FIXME: If attr’s type is an observable array type with type argument T, then set target’s backing observable array exotic object for attr to the result of creating an observable array exotic object in realm, given T, attr’s set an indexed value algorithm, and attr’s delete an indexed value algorithm.
    auto hspace_id = "hspace"_utf16_fly_string;
    auto native_hspace_getter = JS::NativeFunction::create(realm, hspace_getter, 0, hspace_id, &realm, "get"sv);
    auto native_hspace_setter = JS::NativeFunction::create(realm, hspace_setter, 1, hspace_id, &realm, "set"sv);

    // 4. Let configurable be false if attr is unforgeable and true otherwise.
    auto hspace_attributes = default_attributes;

    // 5. Let desc be the PropertyDescriptor{[[Get]]: getter, [[Set]]: setter, [[Enumerable]]: true, [[Configurable]]: configurable}.

    // 7. Perform ! DefinePropertyOrThrow(target, id, desc).
    object.define_direct_accessor(hspace_id, native_hspace_getter, native_hspace_setter, hspace_attributes);

    // 8. FIXME: If attr’s type is an observable array type with type argument T, then set target’s backing observable array exotic object for attr to the result of creating an observable array exotic object in realm, given T, attr’s set an indexed value algorithm, and attr’s delete an indexed value algorithm.
    auto scroll_amount_id = "scrollAmount"_utf16_fly_string;
    auto native_scroll_amount_getter = JS::NativeFunction::create(realm, scroll_amount_getter, 0, scroll_amount_id, &realm, "get"sv);
    auto native_scroll_amount_setter = JS::NativeFunction::create(realm, scroll_amount_setter, 1, scroll_amount_id, &realm, "set"sv);

    // 4. Let configurable be false if attr is unforgeable and true otherwise.
    auto scroll_amount_attributes = default_attributes;

    // 5. Let desc be the PropertyDescriptor{[[Get]]: getter, [[Set]]: setter, [[Enumerable]]: true, [[Configurable]]: configurable}.

    // 7. Perform ! DefinePropertyOrThrow(target, id, desc).
    object.define_direct_accessor(scroll_amount_id, native_scroll_amount_getter, native_scroll_amount_setter, scroll_amount_attributes);

    // 8. FIXME: If attr’s type is an observable array type with type argument T, then set target’s backing observable array exotic object for attr to the result of creating an observable array exotic object in realm, given T, attr’s set an indexed value algorithm, and attr’s delete an indexed value algorithm.
    auto scroll_delay_id = "scrollDelay"_utf16_fly_string;
    auto native_scroll_delay_getter = JS::NativeFunction::create(realm, scroll_delay_getter, 0, scroll_delay_id, &realm, "get"sv);
    auto native_scroll_delay_setter = JS::NativeFunction::create(realm, scroll_delay_setter, 1, scroll_delay_id, &realm, "set"sv);

    // 4. Let configurable be false if attr is unforgeable and true otherwise.
    auto scroll_delay_attributes = default_attributes;

    // 5. Let desc be the PropertyDescriptor{[[Get]]: getter, [[Set]]: setter, [[Enumerable]]: true, [[Configurable]]: configurable}.

    // 7. Perform ! DefinePropertyOrThrow(target, id, desc).
    object.define_direct_accessor(scroll_delay_id, native_scroll_delay_getter, native_scroll_delay_setter, scroll_delay_attributes);

    // 8. FIXME: If attr’s type is an observable array type with type argument T, then set target’s backing observable array exotic object for attr to the result of creating an observable array exotic object in realm, given T, attr’s set an indexed value algorithm, and attr’s delete an indexed value algorithm.
    auto true_speed_id = "trueSpeed"_utf16_fly_string;
    auto native_true_speed_getter = JS::NativeFunction::create(realm, true_speed_getter, 0, true_speed_id, &realm, "get"sv);
    auto native_true_speed_setter = JS::NativeFunction::create(realm, true_speed_setter, 1, true_speed_id, &realm, "set"sv);

    // 4. Let configurable be false if attr is unforgeable and true otherwise.
    auto true_speed_attributes = default_attributes;

    // 5. Let desc be the PropertyDescriptor{[[Get]]: getter, [[Set]]: setter, [[Enumerable]]: true, [[Configurable]]: configurable}.

    // 7. Perform ! DefinePropertyOrThrow(target, id, desc).
    object.define_direct_accessor(true_speed_id, native_true_speed_getter, native_true_speed_setter, true_speed_attributes);

    // 8. FIXME: If attr’s type is an observable array type with type argument T, then set target’s backing observable array exotic object for attr to the result of creating an observable array exotic object in realm, given T, attr’s set an indexed value algorithm, and attr’s delete an indexed value algorithm.
    auto vspace_id = "vspace"_utf16_fly_string;
    auto native_vspace_getter = JS::NativeFunction::create(realm, vspace_getter, 0, vspace_id, &realm, "get"sv);
    auto native_vspace_setter = JS::NativeFunction::create(realm, vspace_setter, 1, vspace_id, &realm, "set"sv);

    // 4. Let configurable be false if attr is unforgeable and true otherwise.
    auto vspace_attributes = default_attributes;

    // 5. Let desc be the PropertyDescriptor{[[Get]]: getter, [[Set]]: setter, [[Enumerable]]: true, [[Configurable]]: configurable}.

    // 7. Perform ! DefinePropertyOrThrow(target, id, desc).
    object.define_direct_accessor(vspace_id, native_vspace_getter, native_vspace_setter, vspace_attributes);

    // 8. FIXME: If attr’s type is an observable array type with type argument T, then set target’s backing observable array exotic object for attr to the result of creating an observable array exotic object in realm, given T, attr’s set an indexed value algorithm, and attr’s delete an indexed value algorithm.
    auto width_id = "width"_utf16_fly_string;
    auto native_width_getter = JS::NativeFunction::create(realm, width_getter, 0, width_id, &realm, "get"sv);
    auto native_width_setter = JS::NativeFunction::create(realm, width_setter, 1, width_id, &realm, "set"sv);

    // 4. Let configurable be false if attr is unforgeable and true otherwise.
    auto width_attributes = default_attributes;

    // 5. Let desc be the PropertyDescriptor{[[Get]]: getter, [[Set]]: setter, [[Enumerable]]: true, [[Configurable]]: configurable}.

    // 7. Perform ! DefinePropertyOrThrow(target, id, desc).
    object.define_direct_accessor(width_id, native_width_getter, native_width_setter, width_attributes);

    // 8. FIXME: If attr’s type is an observable array type with type argument T, then set target’s backing observable array exotic object for attr to the result of creating an observable array exotic object in realm, given T, attr’s set an indexed value algorithm, and attr’s delete an indexed value algorithm.
    object.define_direct_property("start"_utf16_fly_string, JS::js_undefined(), default_attributes | JS::Attribute::Unimplemented);

    object.define_direct_property("stop"_utf16_fly_string, JS::js_undefined(), default_attributes | JS::Attribute::Unimplemented);

    object.define_direct_property(vm.well_known_symbol_to_string_tag(), JS::PrimitiveString::create(vm, "HTMLMarqueeElement"_utf16), JS::Attribute::Configurable);
}

void HTMLMarqueeElementPrototype::define_unforgeable_attributes(JS::Realm& realm, [[maybe_unused]] JS::Object& object)
{
    [[maybe_unused]] auto& vm = realm.vm();
    [[maybe_unused]] u8 default_attributes = JS::Attribute::Enumerable;
}

[[maybe_unused]] static JS::ThrowCompletionOr<HTML::HTMLMarqueeElement*> impl_from(JS::VM& vm, JS::Value js_value)
{

    if (auto impl = js_value.as_if<HTML::HTMLMarqueeElement>())
        return impl.ptr();
    return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "HTMLMarqueeElement");
}

[[maybe_unused]] static JS::ThrowCompletionOr<HTML::HTMLMarqueeElement*> impl_from(JS::VM& vm)
{
    auto this_value = vm.this_value();
    if (this_value.is_nullish())
        this_value = &vm.current_realm()->global_object();
    return impl_from(vm, this_value);
}

JS_DEFINE_NATIVE_FUNCTION(HTMLMarqueeElementPrototype::behavior_getter)
{
    WebIDL::log_trace(vm, "HTMLMarqueeElementPrototype::behavior_getter");
    [[maybe_unused]] auto& realm = *vm.current_realm();

    auto* idl_object = TRY(impl_from(vm));


    // If a reflected IDL attribute has the type DOMString:
    // 1. Let element be the result of running this's get the element.
    // 2. Let contentAttributeValue be the result of running this's get the content attribute.
    // 5. If contentAttributeValue is null, then return the empty string.
    // 6. Return contentAttributeValue.
    auto R = idl_object->get_attribute_value("behavior"_utf16_fly_string);

    return WebIDL::primitive_string_from_string(vm, R);
}

JS_DEFINE_NATIVE_FUNCTION(HTMLMarqueeElementPrototype::bg_color_getter)
{
    WebIDL::log_trace(vm, "HTMLMarqueeElementPrototype::bg_color_getter");
    [[maybe_unused]] auto& realm = *vm.current_realm();

    auto* idl_object = TRY(impl_from(vm));


    // If a reflected IDL attribute has the type DOMString:
    // 1. Let element be the result of running this's get the element.
    // 2. Let contentAttributeValue be the result of running this's get the content attribute.
    // 5. If contentAttributeValue is null, then return the empty string.
    // 6. Return contentAttributeValue.
    auto R = idl_object->get_attribute_value("bgcolor"_utf16_fly_string);

    return WebIDL::primitive_string_from_string(vm, R);
}

JS_DEFINE_NATIVE_FUNCTION(HTMLMarqueeElementPrototype::direction_getter)
{
    WebIDL::log_trace(vm, "HTMLMarqueeElementPrototype::direction_getter");
    [[maybe_unused]] auto& realm = *vm.current_realm();

    auto* idl_object = TRY(impl_from(vm));


    // If a reflected IDL attribute has the type DOMString:
    // 1. Let element be the result of running this's get the element.
    // 2. Let contentAttributeValue be the result of running this's get the content attribute.
    // 5. If contentAttributeValue is null, then return the empty string.
    // 6. Return contentAttributeValue.
    auto R = idl_object->get_attribute_value("direction"_utf16_fly_string);

    return WebIDL::primitive_string_from_string(vm, R);
}

JS_DEFINE_NATIVE_FUNCTION(HTMLMarqueeElementPrototype::height_getter)
{
    WebIDL::log_trace(vm, "HTMLMarqueeElementPrototype::height_getter");
    [[maybe_unused]] auto& realm = *vm.current_realm();

    auto* idl_object = TRY(impl_from(vm));


    // If a reflected IDL attribute has the type DOMString:
    // 1. Let element be the result of running this's get the element.
    // 2. Let contentAttributeValue be the result of running this's get the content attribute.
    // 5. If contentAttributeValue is null, then return the empty string.
    // 6. Return contentAttributeValue.
    auto R = idl_object->get_attribute_value("height"_utf16_fly_string);

    return WebIDL::primitive_string_from_string(vm, R);
}

JS_DEFINE_NATIVE_FUNCTION(HTMLMarqueeElementPrototype::hspace_getter)
{
    WebIDL::log_trace(vm, "HTMLMarqueeElementPrototype::hspace_getter");
    [[maybe_unused]] auto& realm = *vm.current_realm();

    auto* idl_object = TRY(impl_from(vm));


    // If a reflected IDL attribute has the type unsigned long:
    // 1. Let contentAttributeValue be the result of running this's get the content attribute.
    // 2. Let minimum be 0.
    // FIXME: 3. If the reflected IDL attribute is limited to only positive numbers or limited to only positive numbers with fallback, then set minimum to 1.
    // FIXME: 4. If the reflected IDL attribute is clamped to the range, then set minimum to clampedMin.
    // 5. Let maximum be 2147483647 if the reflected IDL attribute is not clamped to the range; otherwise clampedMax.
    // 6. If contentAttributeValue is not null:
    //    1. Let parsedValue be the result of non-negative integer parsing contentAttributeValue.
    //    2. If parsedValue is not an error and is in the range minimum to maximum, inclusive, then return parsedValue.
    u32 R = 0;
    auto content_attribute_value = idl_object->get_attribute("hspace"_utf16_fly_string);
    u32 minimum = 0;
    u32 maximum = 2147483647;
    if (content_attribute_value.has_value()) {
        auto parsed_value = Web::HTML::parse_non_negative_integer(*content_attribute_value);
        if (parsed_value.has_value()) {
            if (*parsed_value >= minimum && *parsed_value <= maximum)
                R = *parsed_value;
        }
    }

    return JS::Value(static_cast<WebIDL::UnsignedLong>(R));
}

JS_DEFINE_NATIVE_FUNCTION(HTMLMarqueeElementPrototype::scroll_amount_getter)
{
    WebIDL::log_trace(vm, "HTMLMarqueeElementPrototype::scroll_amount_getter");
    [[maybe_unused]] auto& realm = *vm.current_realm();

    auto* idl_object = TRY(impl_from(vm));


    auto R = TRY(throw_dom_exception_if_needed(vm, [&] { return idl_object->scroll_amount(); }));

    return JS::Value(static_cast<WebIDL::UnsignedLong>(R));
}

JS_DEFINE_NATIVE_FUNCTION(HTMLMarqueeElementPrototype::scroll_delay_getter)
{
    WebIDL::log_trace(vm, "HTMLMarqueeElementPrototype::scroll_delay_getter");
    [[maybe_unused]] auto& realm = *vm.current_realm();

    auto* idl_object = TRY(impl_from(vm));


    auto R = TRY(throw_dom_exception_if_needed(vm, [&] { return idl_object->scroll_delay(); }));

    return JS::Value(static_cast<WebIDL::UnsignedLong>(R));
}

JS_DEFINE_NATIVE_FUNCTION(HTMLMarqueeElementPrototype::true_speed_getter)
{
    WebIDL::log_trace(vm, "HTMLMarqueeElementPrototype::true_speed_getter");
    [[maybe_unused]] auto& realm = *vm.current_realm();

    auto* idl_object = TRY(impl_from(vm));


    // If a reflected IDL attribute has the type boolean:
    // 1. Let contentAttributeValue be the result of running this's get the content attribute.
    // 2. If contentAttributeValue is null, then return false.
    auto R = idl_object->has_attribute("truespeed"_utf16_fly_string);

    return JS::Value(R);
}

JS_DEFINE_NATIVE_FUNCTION(HTMLMarqueeElementPrototype::vspace_getter)
{
    WebIDL::log_trace(vm, "HTMLMarqueeElementPrototype::vspace_getter");
    [[maybe_unused]] auto& realm = *vm.current_realm();

    auto* idl_object = TRY(impl_from(vm));


    // If a reflected IDL attribute has the type unsigned long:
    // 1. Let contentAttributeValue be the result of running this's get the content attribute.
    // 2. Let minimum be 0.
    // FIXME: 3. If the reflected IDL attribute is limited to only positive numbers or limited to only positive numbers with fallback, then set minimum to 1.
    // FIXME: 4. If the reflected IDL attribute is clamped to the range, then set minimum to clampedMin.
    // 5. Let maximum be 2147483647 if the reflected IDL attribute is not clamped to the range; otherwise clampedMax.
    // 6. If contentAttributeValue is not null:
    //    1. Let parsedValue be the result of non-negative integer parsing contentAttributeValue.
    //    2. If parsedValue is not an error and is in the range minimum to maximum, inclusive, then return parsedValue.
    u32 R = 0;
    auto content_attribute_value = idl_object->get_attribute("vspace"_utf16_fly_string);
    u32 minimum = 0;
    u32 maximum = 2147483647;
    if (content_attribute_value.has_value()) {
        auto parsed_value = Web::HTML::parse_non_negative_integer(*content_attribute_value);
        if (parsed_value.has_value()) {
            if (*parsed_value >= minimum && *parsed_value <= maximum)
                R = *parsed_value;
        }
    }

    return JS::Value(static_cast<WebIDL::UnsignedLong>(R));
}

JS_DEFINE_NATIVE_FUNCTION(HTMLMarqueeElementPrototype::width_getter)
{
    WebIDL::log_trace(vm, "HTMLMarqueeElementPrototype::width_getter");
    [[maybe_unused]] auto& realm = *vm.current_realm();

    auto* idl_object = TRY(impl_from(vm));


    // If a reflected IDL attribute has the type DOMString:
    // 1. Let element be the result of running this's get the element.
    // 2. Let contentAttributeValue be the result of running this's get the content attribute.
    // 5. If contentAttributeValue is null, then return the empty string.
    // 6. Return contentAttributeValue.
    auto R = idl_object->get_attribute_value("width"_utf16_fly_string);

    return WebIDL::primitive_string_from_string(vm, R);
}

JS_DEFINE_NATIVE_FUNCTION(HTMLMarqueeElementPrototype::behavior_setter)
{
    WebIDL::log_trace(vm, "HTMLMarqueeElementPrototype::behavior_setter");
    [[maybe_unused]] auto& realm = *vm.current_realm();

    // 1. Let V be undefined.
    auto V = JS::js_undefined();

    // 2. If any arguments were passed, then set V to the value of the first argument passed.
    if (vm.argument_count() > 0)
        V = vm.argument(0);

    // 3. Let id be attribute’s identifier.

    // 4. Let idlObject be null.
    [[maybe_unused]] HTML::HTMLMarqueeElement* idl_object = nullptr;

    // 5. If attribute is a regular attribute:

    // 1. Let jsValue be the this value, if it is not null or undefined, or realm’s global object otherwise. (This will subsequently cause a TypeError in a few steps, if the global object does not implement target and [LegacyLenientThis] is not specified.)
    auto js_value = vm.this_value();
    if (js_value.is_nullish())
        js_value = &realm.global_object();

    // 2. FIXME: If jsValue is a platform object, then perform a security check, passing jsValue, attribute’s identifier, and "setter".

    // 3. Let validThis be true if jsValue implements target, or false otherwise.
    auto maybe_idl_object = impl_from(vm, js_value);

    // 4. If validThis is false and attribute was not specified with the [LegacyLenientThis] extended attribute, then throw a TypeError.
    idl_object = TRY(maybe_idl_object);

    auto original_steps = [&]() -> JS::ThrowCompletionOr<JS::Value> {
        // 6. Let idlValue be determined as follows:
        // -> Otherwise, idlValue is the result of converting V to an IDL value of attribute’s type.
        auto idl_value = TRY(throw_dom_exception_if_needed(vm, [&] { return [&]() -> JS::ThrowCompletionOr<String> {
        return TRY(WebIDL::to_string(vm, V));
    }(); }));

        // 7. Run the setter steps of attribute with idlObject as this and idlValue as the value.
        auto setter_result = [&]() -> JS::ThrowCompletionOr<void> {
            idl_object->set_attribute_value("behavior"_utf16_fly_string, attribute_value_to_utf16(idl_value));
    return {};
        }();

        if (setter_result.is_error())
            return setter_result.release_error();

        return JS::js_undefined();
    };

    // 8. Return undefined.
    return TRY([&]() -> decltype(original_steps()) {
        // For [CEReactions]: https://html.spec.whatwg.org/multipage/custom-elements.html#cereactions

        // 1. Push a new element queue onto this object's relevant agent's custom element reactions stack.
        auto& reactions_stack = HTML::relevant_similar_origin_window_agent(*idl_object).custom_element_reactions_stack;
        reactions_stack.element_queue_stack.append({});

        // 2. Run the originally-specified steps for this construct, catching any exceptions. If the steps return a value, let value be the returned value. If they throw an exception, let exception be the thrown exception.
        auto value_or_exception = original_steps();

        // 3. Let queue be the result of popping from this object's relevant agent's custom element reactions stack.
        // 4. Invoke custom element reactions in queue.
        auto queue = reactions_stack.element_queue_stack.take_last();
        Bindings::invoke_custom_element_reactions(queue);

        // 5. If an exception exception was thrown by the original steps, rethrow exception.
        if (value_or_exception.is_error())
            return value_or_exception.release_error();

        // 6. If a value value was returned from the original steps, return value.
        return value_or_exception.release_value();
    }());
}

JS_DEFINE_NATIVE_FUNCTION(HTMLMarqueeElementPrototype::bg_color_setter)
{
    WebIDL::log_trace(vm, "HTMLMarqueeElementPrototype::bg_color_setter");
    [[maybe_unused]] auto& realm = *vm.current_realm();

    // 1. Let V be undefined.
    auto V = JS::js_undefined();

    // 2. If any arguments were passed, then set V to the value of the first argument passed.
    if (vm.argument_count() > 0)
        V = vm.argument(0);

    // 3. Let id be attribute’s identifier.

    // 4. Let idlObject be null.
    [[maybe_unused]] HTML::HTMLMarqueeElement* idl_object = nullptr;

    // 5. If attribute is a regular attribute:

    // 1. Let jsValue be the this value, if it is not null or undefined, or realm’s global object otherwise. (This will subsequently cause a TypeError in a few steps, if the global object does not implement target and [LegacyLenientThis] is not specified.)
    auto js_value = vm.this_value();
    if (js_value.is_nullish())
        js_value = &realm.global_object();

    // 2. FIXME: If jsValue is a platform object, then perform a security check, passing jsValue, attribute’s identifier, and "setter".

    // 3. Let validThis be true if jsValue implements target, or false otherwise.
    auto maybe_idl_object = impl_from(vm, js_value);

    // 4. If validThis is false and attribute was not specified with the [LegacyLenientThis] extended attribute, then throw a TypeError.
    idl_object = TRY(maybe_idl_object);

    auto original_steps = [&]() -> JS::ThrowCompletionOr<JS::Value> {
        // 6. Let idlValue be determined as follows:
        // -> Otherwise, idlValue is the result of converting V to an IDL value of attribute’s type.
        auto idl_value = TRY(throw_dom_exception_if_needed(vm, [&] { return [&]() -> JS::ThrowCompletionOr<String> {
        return TRY(WebIDL::to_string(vm, V));
    }(); }));

        // 7. Run the setter steps of attribute with idlObject as this and idlValue as the value.
        auto setter_result = [&]() -> JS::ThrowCompletionOr<void> {
            idl_object->set_attribute_value("bgcolor"_utf16_fly_string, attribute_value_to_utf16(idl_value));
    return {};
        }();

        if (setter_result.is_error())
            return setter_result.release_error();

        return JS::js_undefined();
    };

    // 8. Return undefined.
    return TRY([&]() -> decltype(original_steps()) {
        // For [CEReactions]: https://html.spec.whatwg.org/multipage/custom-elements.html#cereactions

        // 1. Push a new element queue onto this object's relevant agent's custom element reactions stack.
        auto& reactions_stack = HTML::relevant_similar_origin_window_agent(*idl_object).custom_element_reactions_stack;
        reactions_stack.element_queue_stack.append({});

        // 2. Run the originally-specified steps for this construct, catching any exceptions. If the steps return a value, let value be the returned value. If they throw an exception, let exception be the thrown exception.
        auto value_or_exception = original_steps();

        // 3. Let queue be the result of popping from this object's relevant agent's custom element reactions stack.
        // 4. Invoke custom element reactions in queue.
        auto queue = reactions_stack.element_queue_stack.take_last();
        Bindings::invoke_custom_element_reactions(queue);

        // 5. If an exception exception was thrown by the original steps, rethrow exception.
        if (value_or_exception.is_error())
            return value_or_exception.release_error();

        // 6. If a value value was returned from the original steps, return value.
        return value_or_exception.release_value();
    }());
}

JS_DEFINE_NATIVE_FUNCTION(HTMLMarqueeElementPrototype::direction_setter)
{
    WebIDL::log_trace(vm, "HTMLMarqueeElementPrototype::direction_setter");
    [[maybe_unused]] auto& realm = *vm.current_realm();

    // 1. Let V be undefined.
    auto V = JS::js_undefined();

    // 2. If any arguments were passed, then set V to the value of the first argument passed.
    if (vm.argument_count() > 0)
        V = vm.argument(0);

    // 3. Let id be attribute’s identifier.

    // 4. Let idlObject be null.
    [[maybe_unused]] HTML::HTMLMarqueeElement* idl_object = nullptr;

    // 5. If attribute is a regular attribute:

    // 1. Let jsValue be the this value, if it is not null or undefined, or realm’s global object otherwise. (This will subsequently cause a TypeError in a few steps, if the global object does not implement target and [LegacyLenientThis] is not specified.)
    auto js_value = vm.this_value();
    if (js_value.is_nullish())
        js_value = &realm.global_object();

    // 2. FIXME: If jsValue is a platform object, then perform a security check, passing jsValue, attribute’s identifier, and "setter".

    // 3. Let validThis be true if jsValue implements target, or false otherwise.
    auto maybe_idl_object = impl_from(vm, js_value);

    // 4. If validThis is false and attribute was not specified with the [LegacyLenientThis] extended attribute, then throw a TypeError.
    idl_object = TRY(maybe_idl_object);

    auto original_steps = [&]() -> JS::ThrowCompletionOr<JS::Value> {
        // 6. Let idlValue be determined as follows:
        // -> Otherwise, idlValue is the result of converting V to an IDL value of attribute’s type.
        auto idl_value = TRY(throw_dom_exception_if_needed(vm, [&] { return [&]() -> JS::ThrowCompletionOr<String> {
        return TRY(WebIDL::to_string(vm, V));
    }(); }));

        // 7. Run the setter steps of attribute with idlObject as this and idlValue as the value.
        auto setter_result = [&]() -> JS::ThrowCompletionOr<void> {
            idl_object->set_attribute_value("direction"_utf16_fly_string, attribute_value_to_utf16(idl_value));
    return {};
        }();

        if (setter_result.is_error())
            return setter_result.release_error();

        return JS::js_undefined();
    };

    // 8. Return undefined.
    return TRY([&]() -> decltype(original_steps()) {
        // For [CEReactions]: https://html.spec.whatwg.org/multipage/custom-elements.html#cereactions

        // 1. Push a new element queue onto this object's relevant agent's custom element reactions stack.
        auto& reactions_stack = HTML::relevant_similar_origin_window_agent(*idl_object).custom_element_reactions_stack;
        reactions_stack.element_queue_stack.append({});

        // 2. Run the originally-specified steps for this construct, catching any exceptions. If the steps return a value, let value be the returned value. If they throw an exception, let exception be the thrown exception.
        auto value_or_exception = original_steps();

        // 3. Let queue be the result of popping from this object's relevant agent's custom element reactions stack.
        // 4. Invoke custom element reactions in queue.
        auto queue = reactions_stack.element_queue_stack.take_last();
        Bindings::invoke_custom_element_reactions(queue);

        // 5. If an exception exception was thrown by the original steps, rethrow exception.
        if (value_or_exception.is_error())
            return value_or_exception.release_error();

        // 6. If a value value was returned from the original steps, return value.
        return value_or_exception.release_value();
    }());
}

JS_DEFINE_NATIVE_FUNCTION(HTMLMarqueeElementPrototype::height_setter)
{
    WebIDL::log_trace(vm, "HTMLMarqueeElementPrototype::height_setter");
    [[maybe_unused]] auto& realm = *vm.current_realm();

    // 1. Let V be undefined.
    auto V = JS::js_undefined();

    // 2. If any arguments were passed, then set V to the value of the first argument passed.
    if (vm.argument_count() > 0)
        V = vm.argument(0);

    // 3. Let id be attribute’s identifier.

    // 4. Let idlObject be null.
    [[maybe_unused]] HTML::HTMLMarqueeElement* idl_object = nullptr;

    // 5. If attribute is a regular attribute:

    // 1. Let jsValue be the this value, if it is not null or undefined, or realm’s global object otherwise. (This will subsequently cause a TypeError in a few steps, if the global object does not implement target and [LegacyLenientThis] is not specified.)
    auto js_value = vm.this_value();
    if (js_value.is_nullish())
        js_value = &realm.global_object();

    // 2. FIXME: If jsValue is a platform object, then perform a security check, passing jsValue, attribute’s identifier, and "setter".

    // 3. Let validThis be true if jsValue implements target, or false otherwise.
    auto maybe_idl_object = impl_from(vm, js_value);

    // 4. If validThis is false and attribute was not specified with the [LegacyLenientThis] extended attribute, then throw a TypeError.
    idl_object = TRY(maybe_idl_object);

    auto original_steps = [&]() -> JS::ThrowCompletionOr<JS::Value> {
        // 6. Let idlValue be determined as follows:
        // -> Otherwise, idlValue is the result of converting V to an IDL value of attribute’s type.
        auto idl_value = TRY(throw_dom_exception_if_needed(vm, [&] { return [&]() -> JS::ThrowCompletionOr<String> {
        return TRY(WebIDL::to_string(vm, V));
    }(); }));

        // 7. Run the setter steps of attribute with idlObject as this and idlValue as the value.
        auto setter_result = [&]() -> JS::ThrowCompletionOr<void> {
            idl_object->set_attribute_value("height"_utf16_fly_string, attribute_value_to_utf16(idl_value));
    return {};
        }();

        if (setter_result.is_error())
            return setter_result.release_error();

        return JS::js_undefined();
    };

    // 8. Return undefined.
    return TRY([&]() -> decltype(original_steps()) {
        // For [CEReactions]: https://html.spec.whatwg.org/multipage/custom-elements.html#cereactions

        // 1. Push a new element queue onto this object's relevant agent's custom element reactions stack.
        auto& reactions_stack = HTML::relevant_similar_origin_window_agent(*idl_object).custom_element_reactions_stack;
        reactions_stack.element_queue_stack.append({});

        // 2. Run the originally-specified steps for this construct, catching any exceptions. If the steps return a value, let value be the returned value. If they throw an exception, let exception be the thrown exception.
        auto value_or_exception = original_steps();

        // 3. Let queue be the result of popping from this object's relevant agent's custom element reactions stack.
        // 4. Invoke custom element reactions in queue.
        auto queue = reactions_stack.element_queue_stack.take_last();
        Bindings::invoke_custom_element_reactions(queue);

        // 5. If an exception exception was thrown by the original steps, rethrow exception.
        if (value_or_exception.is_error())
            return value_or_exception.release_error();

        // 6. If a value value was returned from the original steps, return value.
        return value_or_exception.release_value();
    }());
}

JS_DEFINE_NATIVE_FUNCTION(HTMLMarqueeElementPrototype::hspace_setter)
{
    WebIDL::log_trace(vm, "HTMLMarqueeElementPrototype::hspace_setter");
    [[maybe_unused]] auto& realm = *vm.current_realm();

    // 1. Let V be undefined.
    auto V = JS::js_undefined();

    // 2. If any arguments were passed, then set V to the value of the first argument passed.
    if (vm.argument_count() > 0)
        V = vm.argument(0);

    // 3. Let id be attribute’s identifier.

    // 4. Let idlObject be null.
    [[maybe_unused]] HTML::HTMLMarqueeElement* idl_object = nullptr;

    // 5. If attribute is a regular attribute:

    // 1. Let jsValue be the this value, if it is not null or undefined, or realm’s global object otherwise. (This will subsequently cause a TypeError in a few steps, if the global object does not implement target and [LegacyLenientThis] is not specified.)
    auto js_value = vm.this_value();
    if (js_value.is_nullish())
        js_value = &realm.global_object();

    // 2. FIXME: If jsValue is a platform object, then perform a security check, passing jsValue, attribute’s identifier, and "setter".

    // 3. Let validThis be true if jsValue implements target, or false otherwise.
    auto maybe_idl_object = impl_from(vm, js_value);

    // 4. If validThis is false and attribute was not specified with the [LegacyLenientThis] extended attribute, then throw a TypeError.
    idl_object = TRY(maybe_idl_object);

    auto original_steps = [&]() -> JS::ThrowCompletionOr<JS::Value> {
        // 6. Let idlValue be determined as follows:
        // -> Otherwise, idlValue is the result of converting V to an IDL value of attribute’s type.
        auto idl_value = TRY(throw_dom_exception_if_needed(vm, [&] { return WebIDL::convert_to_int<WebIDL::UnsignedLong>(vm, V, WebIDL::EnforceRange::No, WebIDL::Clamp::No); }));

        // 7. Run the setter steps of attribute with idlObject as this and idlValue as the value.
        auto setter_result = [&]() -> JS::ThrowCompletionOr<void> {
            u32 minimum = 0;
    u32 new_value = minimum;
    if (idl_value >= minimum && idl_value <= 2147483647)
        new_value = idl_value;
    idl_object->set_attribute_value("hspace"_utf16_fly_string, Utf16String::number(new_value));
    return {};
        }();

        if (setter_result.is_error())
            return setter_result.release_error();

        return JS::js_undefined();
    };

    // 8. Return undefined.
    return TRY([&]() -> decltype(original_steps()) {
        // For [CEReactions]: https://html.spec.whatwg.org/multipage/custom-elements.html#cereactions

        // 1. Push a new element queue onto this object's relevant agent's custom element reactions stack.
        auto& reactions_stack = HTML::relevant_similar_origin_window_agent(*idl_object).custom_element_reactions_stack;
        reactions_stack.element_queue_stack.append({});

        // 2. Run the originally-specified steps for this construct, catching any exceptions. If the steps return a value, let value be the returned value. If they throw an exception, let exception be the thrown exception.
        auto value_or_exception = original_steps();

        // 3. Let queue be the result of popping from this object's relevant agent's custom element reactions stack.
        // 4. Invoke custom element reactions in queue.
        auto queue = reactions_stack.element_queue_stack.take_last();
        Bindings::invoke_custom_element_reactions(queue);

        // 5. If an exception exception was thrown by the original steps, rethrow exception.
        if (value_or_exception.is_error())
            return value_or_exception.release_error();

        // 6. If a value value was returned from the original steps, return value.
        return value_or_exception.release_value();
    }());
}

JS_DEFINE_NATIVE_FUNCTION(HTMLMarqueeElementPrototype::scroll_amount_setter)
{
    WebIDL::log_trace(vm, "HTMLMarqueeElementPrototype::scroll_amount_setter");
    [[maybe_unused]] auto& realm = *vm.current_realm();

    // 1. Let V be undefined.
    auto V = JS::js_undefined();

    // 2. If any arguments were passed, then set V to the value of the first argument passed.
    if (vm.argument_count() > 0)
        V = vm.argument(0);

    // 3. Let id be attribute’s identifier.

    // 4. Let idlObject be null.
    [[maybe_unused]] HTML::HTMLMarqueeElement* idl_object = nullptr;

    // 5. If attribute is a regular attribute:

    // 1. Let jsValue be the this value, if it is not null or undefined, or realm’s global object otherwise. (This will subsequently cause a TypeError in a few steps, if the global object does not implement target and [LegacyLenientThis] is not specified.)
    auto js_value = vm.this_value();
    if (js_value.is_nullish())
        js_value = &realm.global_object();

    // 2. FIXME: If jsValue is a platform object, then perform a security check, passing jsValue, attribute’s identifier, and "setter".

    // 3. Let validThis be true if jsValue implements target, or false otherwise.
    auto maybe_idl_object = impl_from(vm, js_value);

    // 4. If validThis is false and attribute was not specified with the [LegacyLenientThis] extended attribute, then throw a TypeError.
    idl_object = TRY(maybe_idl_object);

    auto original_steps = [&]() -> JS::ThrowCompletionOr<JS::Value> {
        // 6. Let idlValue be determined as follows:
        // -> Otherwise, idlValue is the result of converting V to an IDL value of attribute’s type.
        auto idl_value = TRY(throw_dom_exception_if_needed(vm, [&] { return WebIDL::convert_to_int<WebIDL::UnsignedLong>(vm, V, WebIDL::EnforceRange::No, WebIDL::Clamp::No); }));

        // 7. Run the setter steps of attribute with idlObject as this and idlValue as the value.
        auto setter_result = [&]() -> JS::ThrowCompletionOr<void> {
            TRY(throw_dom_exception_if_needed(vm, [&] { return idl_object->set_scroll_amount(idl_value); }));
    return {};
        }();

        if (setter_result.is_error())
            return setter_result.release_error();

        return JS::js_undefined();
    };

    // 8. Return undefined.
    return TRY([&]() -> decltype(original_steps()) {
        // For [CEReactions]: https://html.spec.whatwg.org/multipage/custom-elements.html#cereactions

        // 1. Push a new element queue onto this object's relevant agent's custom element reactions stack.
        auto& reactions_stack = HTML::relevant_similar_origin_window_agent(*idl_object).custom_element_reactions_stack;
        reactions_stack.element_queue_stack.append({});

        // 2. Run the originally-specified steps for this construct, catching any exceptions. If the steps return a value, let value be the returned value. If they throw an exception, let exception be the thrown exception.
        auto value_or_exception = original_steps();

        // 3. Let queue be the result of popping from this object's relevant agent's custom element reactions stack.
        // 4. Invoke custom element reactions in queue.
        auto queue = reactions_stack.element_queue_stack.take_last();
        Bindings::invoke_custom_element_reactions(queue);

        // 5. If an exception exception was thrown by the original steps, rethrow exception.
        if (value_or_exception.is_error())
            return value_or_exception.release_error();

        // 6. If a value value was returned from the original steps, return value.
        return value_or_exception.release_value();
    }());
}

JS_DEFINE_NATIVE_FUNCTION(HTMLMarqueeElementPrototype::scroll_delay_setter)
{
    WebIDL::log_trace(vm, "HTMLMarqueeElementPrototype::scroll_delay_setter");
    [[maybe_unused]] auto& realm = *vm.current_realm();

    // 1. Let V be undefined.
    auto V = JS::js_undefined();

    // 2. If any arguments were passed, then set V to the value of the first argument passed.
    if (vm.argument_count() > 0)
        V = vm.argument(0);

    // 3. Let id be attribute’s identifier.

    // 4. Let idlObject be null.
    [[maybe_unused]] HTML::HTMLMarqueeElement* idl_object = nullptr;

    // 5. If attribute is a regular attribute:

    // 1. Let jsValue be the this value, if it is not null or undefined, or realm’s global object otherwise. (This will subsequently cause a TypeError in a few steps, if the global object does not implement target and [LegacyLenientThis] is not specified.)
    auto js_value = vm.this_value();
    if (js_value.is_nullish())
        js_value = &realm.global_object();

    // 2. FIXME: If jsValue is a platform object, then perform a security check, passing jsValue, attribute’s identifier, and "setter".

    // 3. Let validThis be true if jsValue implements target, or false otherwise.
    auto maybe_idl_object = impl_from(vm, js_value);

    // 4. If validThis is false and attribute was not specified with the [LegacyLenientThis] extended attribute, then throw a TypeError.
    idl_object = TRY(maybe_idl_object);

    auto original_steps = [&]() -> JS::ThrowCompletionOr<JS::Value> {
        // 6. Let idlValue be determined as follows:
        // -> Otherwise, idlValue is the result of converting V to an IDL value of attribute’s type.
        auto idl_value = TRY(throw_dom_exception_if_needed(vm, [&] { return WebIDL::convert_to_int<WebIDL::UnsignedLong>(vm, V, WebIDL::EnforceRange::No, WebIDL::Clamp::No); }));

        // 7. Run the setter steps of attribute with idlObject as this and idlValue as the value.
        auto setter_result = [&]() -> JS::ThrowCompletionOr<void> {
            TRY(throw_dom_exception_if_needed(vm, [&] { return idl_object->set_scroll_delay(idl_value); }));
    return {};
        }();

        if (setter_result.is_error())
            return setter_result.release_error();

        return JS::js_undefined();
    };

    // 8. Return undefined.
    return TRY([&]() -> decltype(original_steps()) {
        // For [CEReactions]: https://html.spec.whatwg.org/multipage/custom-elements.html#cereactions

        // 1. Push a new element queue onto this object's relevant agent's custom element reactions stack.
        auto& reactions_stack = HTML::relevant_similar_origin_window_agent(*idl_object).custom_element_reactions_stack;
        reactions_stack.element_queue_stack.append({});

        // 2. Run the originally-specified steps for this construct, catching any exceptions. If the steps return a value, let value be the returned value. If they throw an exception, let exception be the thrown exception.
        auto value_or_exception = original_steps();

        // 3. Let queue be the result of popping from this object's relevant agent's custom element reactions stack.
        // 4. Invoke custom element reactions in queue.
        auto queue = reactions_stack.element_queue_stack.take_last();
        Bindings::invoke_custom_element_reactions(queue);

        // 5. If an exception exception was thrown by the original steps, rethrow exception.
        if (value_or_exception.is_error())
            return value_or_exception.release_error();

        // 6. If a value value was returned from the original steps, return value.
        return value_or_exception.release_value();
    }());
}

JS_DEFINE_NATIVE_FUNCTION(HTMLMarqueeElementPrototype::true_speed_setter)
{
    WebIDL::log_trace(vm, "HTMLMarqueeElementPrototype::true_speed_setter");
    [[maybe_unused]] auto& realm = *vm.current_realm();

    // 1. Let V be undefined.
    auto V = JS::js_undefined();

    // 2. If any arguments were passed, then set V to the value of the first argument passed.
    if (vm.argument_count() > 0)
        V = vm.argument(0);

    // 3. Let id be attribute’s identifier.

    // 4. Let idlObject be null.
    [[maybe_unused]] HTML::HTMLMarqueeElement* idl_object = nullptr;

    // 5. If attribute is a regular attribute:

    // 1. Let jsValue be the this value, if it is not null or undefined, or realm’s global object otherwise. (This will subsequently cause a TypeError in a few steps, if the global object does not implement target and [LegacyLenientThis] is not specified.)
    auto js_value = vm.this_value();
    if (js_value.is_nullish())
        js_value = &realm.global_object();

    // 2. FIXME: If jsValue is a platform object, then perform a security check, passing jsValue, attribute’s identifier, and "setter".

    // 3. Let validThis be true if jsValue implements target, or false otherwise.
    auto maybe_idl_object = impl_from(vm, js_value);

    // 4. If validThis is false and attribute was not specified with the [LegacyLenientThis] extended attribute, then throw a TypeError.
    idl_object = TRY(maybe_idl_object);

    auto original_steps = [&]() -> JS::ThrowCompletionOr<JS::Value> {
        // 6. Let idlValue be determined as follows:
        // -> Otherwise, idlValue is the result of converting V to an IDL value of attribute’s type.
        auto idl_value = TRY(throw_dom_exception_if_needed(vm, [&] { return V.to_boolean(); }));

        // 7. Run the setter steps of attribute with idlObject as this and idlValue as the value.
        auto setter_result = [&]() -> JS::ThrowCompletionOr<void> {
            if (!idl_value)
        idl_object->remove_attribute("truespeed"_utf16_fly_string);
    else
        idl_object->set_attribute_value("truespeed"_utf16_fly_string, Utf16String {});
    return {};
        }();

        if (setter_result.is_error())
            return setter_result.release_error();

        return JS::js_undefined();
    };

    // 8. Return undefined.
    return TRY([&]() -> decltype(original_steps()) {
        // For [CEReactions]: https://html.spec.whatwg.org/multipage/custom-elements.html#cereactions

        // 1. Push a new element queue onto this object's relevant agent's custom element reactions stack.
        auto& reactions_stack = HTML::relevant_similar_origin_window_agent(*idl_object).custom_element_reactions_stack;
        reactions_stack.element_queue_stack.append({});

        // 2. Run the originally-specified steps for this construct, catching any exceptions. If the steps return a value, let value be the returned value. If they throw an exception, let exception be the thrown exception.
        auto value_or_exception = original_steps();

        // 3. Let queue be the result of popping from this object's relevant agent's custom element reactions stack.
        // 4. Invoke custom element reactions in queue.
        auto queue = reactions_stack.element_queue_stack.take_last();
        Bindings::invoke_custom_element_reactions(queue);

        // 5. If an exception exception was thrown by the original steps, rethrow exception.
        if (value_or_exception.is_error())
            return value_or_exception.release_error();

        // 6. If a value value was returned from the original steps, return value.
        return value_or_exception.release_value();
    }());
}

JS_DEFINE_NATIVE_FUNCTION(HTMLMarqueeElementPrototype::vspace_setter)
{
    WebIDL::log_trace(vm, "HTMLMarqueeElementPrototype::vspace_setter");
    [[maybe_unused]] auto& realm = *vm.current_realm();

    // 1. Let V be undefined.
    auto V = JS::js_undefined();

    // 2. If any arguments were passed, then set V to the value of the first argument passed.
    if (vm.argument_count() > 0)
        V = vm.argument(0);

    // 3. Let id be attribute’s identifier.

    // 4. Let idlObject be null.
    [[maybe_unused]] HTML::HTMLMarqueeElement* idl_object = nullptr;

    // 5. If attribute is a regular attribute:

    // 1. Let jsValue be the this value, if it is not null or undefined, or realm’s global object otherwise. (This will subsequently cause a TypeError in a few steps, if the global object does not implement target and [LegacyLenientThis] is not specified.)
    auto js_value = vm.this_value();
    if (js_value.is_nullish())
        js_value = &realm.global_object();

    // 2. FIXME: If jsValue is a platform object, then perform a security check, passing jsValue, attribute’s identifier, and "setter".

    // 3. Let validThis be true if jsValue implements target, or false otherwise.
    auto maybe_idl_object = impl_from(vm, js_value);

    // 4. If validThis is false and attribute was not specified with the [LegacyLenientThis] extended attribute, then throw a TypeError.
    idl_object = TRY(maybe_idl_object);

    auto original_steps = [&]() -> JS::ThrowCompletionOr<JS::Value> {
        // 6. Let idlValue be determined as follows:
        // -> Otherwise, idlValue is the result of converting V to an IDL value of attribute’s type.
        auto idl_value = TRY(throw_dom_exception_if_needed(vm, [&] { return WebIDL::convert_to_int<WebIDL::UnsignedLong>(vm, V, WebIDL::EnforceRange::No, WebIDL::Clamp::No); }));

        // 7. Run the setter steps of attribute with idlObject as this and idlValue as the value.
        auto setter_result = [&]() -> JS::ThrowCompletionOr<void> {
            u32 minimum = 0;
    u32 new_value = minimum;
    if (idl_value >= minimum && idl_value <= 2147483647)
        new_value = idl_value;
    idl_object->set_attribute_value("vspace"_utf16_fly_string, Utf16String::number(new_value));
    return {};
        }();

        if (setter_result.is_error())
            return setter_result.release_error();

        return JS::js_undefined();
    };

    // 8. Return undefined.
    return TRY([&]() -> decltype(original_steps()) {
        // For [CEReactions]: https://html.spec.whatwg.org/multipage/custom-elements.html#cereactions

        // 1. Push a new element queue onto this object's relevant agent's custom element reactions stack.
        auto& reactions_stack = HTML::relevant_similar_origin_window_agent(*idl_object).custom_element_reactions_stack;
        reactions_stack.element_queue_stack.append({});

        // 2. Run the originally-specified steps for this construct, catching any exceptions. If the steps return a value, let value be the returned value. If they throw an exception, let exception be the thrown exception.
        auto value_or_exception = original_steps();

        // 3. Let queue be the result of popping from this object's relevant agent's custom element reactions stack.
        // 4. Invoke custom element reactions in queue.
        auto queue = reactions_stack.element_queue_stack.take_last();
        Bindings::invoke_custom_element_reactions(queue);

        // 5. If an exception exception was thrown by the original steps, rethrow exception.
        if (value_or_exception.is_error())
            return value_or_exception.release_error();

        // 6. If a value value was returned from the original steps, return value.
        return value_or_exception.release_value();
    }());
}

JS_DEFINE_NATIVE_FUNCTION(HTMLMarqueeElementPrototype::width_setter)
{
    WebIDL::log_trace(vm, "HTMLMarqueeElementPrototype::width_setter");
    [[maybe_unused]] auto& realm = *vm.current_realm();

    // 1. Let V be undefined.
    auto V = JS::js_undefined();

    // 2. If any arguments were passed, then set V to the value of the first argument passed.
    if (vm.argument_count() > 0)
        V = vm.argument(0);

    // 3. Let id be attribute’s identifier.

    // 4. Let idlObject be null.
    [[maybe_unused]] HTML::HTMLMarqueeElement* idl_object = nullptr;

    // 5. If attribute is a regular attribute:

    // 1. Let jsValue be the this value, if it is not null or undefined, or realm’s global object otherwise. (This will subsequently cause a TypeError in a few steps, if the global object does not implement target and [LegacyLenientThis] is not specified.)
    auto js_value = vm.this_value();
    if (js_value.is_nullish())
        js_value = &realm.global_object();

    // 2. FIXME: If jsValue is a platform object, then perform a security check, passing jsValue, attribute’s identifier, and "setter".

    // 3. Let validThis be true if jsValue implements target, or false otherwise.
    auto maybe_idl_object = impl_from(vm, js_value);

    // 4. If validThis is false and attribute was not specified with the [LegacyLenientThis] extended attribute, then throw a TypeError.
    idl_object = TRY(maybe_idl_object);

    auto original_steps = [&]() -> JS::ThrowCompletionOr<JS::Value> {
        // 6. Let idlValue be determined as follows:
        // -> Otherwise, idlValue is the result of converting V to an IDL value of attribute’s type.
        auto idl_value = TRY(throw_dom_exception_if_needed(vm, [&] { return [&]() -> JS::ThrowCompletionOr<String> {
        return TRY(WebIDL::to_string(vm, V));
    }(); }));

        // 7. Run the setter steps of attribute with idlObject as this and idlValue as the value.
        auto setter_result = [&]() -> JS::ThrowCompletionOr<void> {
            idl_object->set_attribute_value("width"_utf16_fly_string, attribute_value_to_utf16(idl_value));
    return {};
        }();

        if (setter_result.is_error())
            return setter_result.release_error();

        return JS::js_undefined();
    };

    // 8. Return undefined.
    return TRY([&]() -> decltype(original_steps()) {
        // For [CEReactions]: https://html.spec.whatwg.org/multipage/custom-elements.html#cereactions

        // 1. Push a new element queue onto this object's relevant agent's custom element reactions stack.
        auto& reactions_stack = HTML::relevant_similar_origin_window_agent(*idl_object).custom_element_reactions_stack;
        reactions_stack.element_queue_stack.append({});

        // 2. Run the originally-specified steps for this construct, catching any exceptions. If the steps return a value, let value be the returned value. If they throw an exception, let exception be the thrown exception.
        auto value_or_exception = original_steps();

        // 3. Let queue be the result of popping from this object's relevant agent's custom element reactions stack.
        // 4. Invoke custom element reactions in queue.
        auto queue = reactions_stack.element_queue_stack.take_last();
        Bindings::invoke_custom_element_reactions(queue);

        // 5. If an exception exception was thrown by the original steps, rethrow exception.
        if (value_or_exception.is_error())
            return value_or_exception.release_error();

        // 6. If a value value was returned from the original steps, return value.
        return value_or_exception.release_value();
    }());
}

} // namespace Web::Bindings