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ladybird/Libraries/LibWeb/HTML/HTMLMarqueeElement.h

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LibWeb: Add all HTML elements between L and Q
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/*
Everywhere: Use "the SerenityOS developers." in copyright headers We had some inconsistencies before: - Sometimes "The", sometimes "the" - Sometimes trailing ".", sometimes no trailing "." I picked the most common one (lowecase "the", trailing ".") and applied it to all copyright headers. By using the exact same string everywhere we can ensure nothing gets missed during a global search (and replace), and that these inconsistencies are not spread any further (as copyright headers are commonly copied to new files).
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* Copyright (c) 2020, the SerenityOS developers.
LibWeb: Implement HTMLMarqueeElement.scrollAmount
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* Copyright (c) 2024, Jamie Mansfield <jmansfield@cadixdev.org>
LibWeb: Add all HTML elements between L and Q
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*
Everything: Move to SPDX license identifiers in all files. SPDX License Identifiers are a more compact / standardized way of representing file license information. See: https://spdx.dev/resources/use/#identifiers This was done with the `ambr` search and replace tool. ambr --no-parent-ignore --key-from-file --rep-from-file key.txt rep.txt *
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* SPDX-License-Identifier: BSD-2-Clause
LibWeb: Add all HTML elements between L and Q
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*/
#pragma once
#include <LibWeb/HTML/HTMLElement.h>
LibWeb: Implement HTMLMarqueeElement.scrollAmount
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#include <LibWeb/WebIDL/Types.h>
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namespace Web::HTML {
// NOTE: This element is marked as obsolete, but is still listed as required by the specification.
class HTMLMarqueeElement final : public HTMLElement {
LibWeb+LibJS: Make the EventTarget hierarchy (incl. DOM) GC-allocated This is a monster patch that turns all EventTargets into GC-allocated PlatformObjects. Their C++ wrapper classes are removed, and the LibJS garbage collector is now responsible for their lifetimes. There's a fair amount of hacks and band-aids in this patch, and we'll have a lot of cleanup to do after this.
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WEB_PLATFORM_OBJECT(HTMLMarqueeElement, HTMLElement);
LibGC+Everywhere: Factor out a LibGC from LibJS Resulting in a massive rename across almost everywhere! Alongside the namespace change, we now have the following names: * JS::NonnullGCPtr -> GC::Ref * JS::GCPtr -> GC::Ptr * JS::HeapFunction -> GC::Function * JS::CellImpl -> GC::Cell * JS::Handle -> GC::Root
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GC_DECLARE_ALLOCATOR(HTMLMarqueeElement);
LibWeb: Add all HTML elements between L and Q
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LibWeb+LibJS: Make the EventTarget hierarchy (incl. DOM) GC-allocated This is a monster patch that turns all EventTargets into GC-allocated PlatformObjects. Their C++ wrapper classes are removed, and the LibJS garbage collector is now responsible for their lifetimes. There's a fair amount of hacks and band-aids in this patch, and we'll have a lot of cleanup to do after this.
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public:
LibWeb: Add all HTML elements between L and Q
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virtual ~HTMLMarqueeElement() override;
LibWeb: Respect the bgcolor attribute on <marquee> elements We don't yet animate marquees, but we can at least fill them with the right background color.
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LibWeb: Implement HTMLMarqueeElement.scrollAmount
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WebIDL::UnsignedLong scroll_amount();
LibWeb: Avoid invoking Trusted Types where avoidable Prevents observably calling Trusted Types, which can run arbitrary JS, cause crashes due to use of MUST and allow arbitrary JS to modify internal elements.
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void set_scroll_amount(WebIDL::UnsignedLong);
LibWeb: Implement HTMLMarqueeElement.scrollAmount
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LibWeb: Implement HTMLMarqueeElement.scrollDelay
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WebIDL::UnsignedLong scroll_delay();
LibWeb: Avoid invoking Trusted Types where avoidable Prevents observably calling Trusted Types, which can run arbitrary JS, cause crashes due to use of MUST and allow arbitrary JS to modify internal elements.
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void set_scroll_delay(WebIDL::UnsignedLong);
LibWeb: Implement HTMLMarqueeElement.scrollDelay
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LibWeb: Respect the bgcolor attribute on <marquee> elements We don't yet animate marquees, but we can at least fill them with the right background color.
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private:
LibWeb+LibJS: Make the EventTarget hierarchy (incl. DOM) GC-allocated This is a monster patch that turns all EventTargets into GC-allocated PlatformObjects. Their C++ wrapper classes are removed, and the LibJS garbage collector is now responsible for their lifetimes. There's a fair amount of hacks and band-aids in this patch, and we'll have a lot of cleanup to do after this.
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HTMLMarqueeElement(DOM::Document&, DOM::QualifiedName);
LibWeb: Move setting of Web object prototypes to initialize() This needs to happen before prototype/constructor intitialization can be made lazy. Otherwise, GC could run during the C++ constructor and try to collect the object currently being created.
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LibJS: Make Cell::initialize() return void Stop worrying about tiny OOMs. Work towards #20405
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virtual void initialize(JS::Realm&) override;
LibWeb: Avoid many style invalidations on DOM attribute mutation Many times, attribute mutation doesn't necessitate a full style invalidation on the element. However, the conditions are pretty elaborate, so this first version has a lot of false positives. We only need to invalidate style when any of these things apply: 1. The change may affect the match state of a selector somewhere. 2. The change may affect presentational hints applied to the element. For (1) in this first version, we have a fixed list of attribute names that may affect selectors. We also collect all names referenced by attribute selectors anywhere in the document. For (2), we add a new Element::is_presentational_hint() virtual that tells us whether a given attribute name is a presentational hint. This drastically reduces style work on many websites. As an example, https://cnn.com/ is once again browseable.
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virtual bool is_presentational_hint(FlyString const&) const override;
LibWeb: Route presentational hints through the CSS cascade Previously, presentational hints bypassed the regular cascade pipeline and wrote directly into `CascadedProperties` under `CascadeOrigin::Author`. That meant `var()` substitution and the invalid-at-computed-value-time fallback had to be duplicated in a separate per-element pass, which in practice missed the IACVT step and could leave a `GuaranteedInvalidStyleValue` in the cascaded properties. This caused a crash in downstream code that assumed the value had been resolved. This introduces an `AuthorPresentationalHint` cascade origin and feeds them through the cascade as normal declarations. This means that `var()` resolution now happens in only one place.
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virtual void apply_presentational_hints(Vector<CSS::StyleProperty>&) const override;
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};
}
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