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LibWeb: Add HTMLSelectedContentElement for customizable select

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Introduce the HTMLSelectedContentElement and integrate it into
<select>, <option> and HTMLParser.

See whatwg/html#10548.

There are two bugs with WPT tests which causes the third subtest
in selectedcontent.html and selectedcontent-mutations.html fail.
See whatwg/html#11882, web-platform-tests/wpt#55849.
This commit is contained in:
Feng Yu
2025-12-07 16:37:54 -08:00
committed by Sam Atkins
parent 89d50befb0
commit b58fcaeecf
Notes: github-actions[bot] 2025-12-12 12:07:51 +00:00 
Author: https://github.com/F3n67u
Commit: https://github.com/LadybirdBrowser/ladybird/commit/b58fcaeecf8
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/7024
Reviewed-by: https://github.com/AtkinsSJ ✅
25 changed files with 945 additions and 205 deletions
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43
Libraries/LibWeb/HTML/HTMLSelectedContentElement.h Normal file
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/*
* Copyright (c) 2025, Feng Yu <f3n67u@outlook.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <LibWeb/ARIA/Roles.h>
#include <LibWeb/HTML/HTMLElement.h>
namespace Web::HTML {
// https://html.spec.whatwg.org/multipage/form-elements.html#the-selectedcontent-element
class HTMLSelectedContentElement final : public HTMLElement {
WEB_PLATFORM_OBJECT(HTMLSelectedContentElement, HTMLElement);
GC_DECLARE_ALLOCATOR(HTMLSelectedContentElement);
public:
virtual ~HTMLSelectedContentElement() override;
// https://www.w3.org/TR/html-aria/#el-selectedcontent
virtual Optional<ARIA::Role> default_role() const override { return ARIA::Role::generic; }
// https://html.spec.whatwg.org/multipage/form-elements.html#clear-a-selectedcontent
void clear_selectedcontent();
bool disabled() const { return m_disabled; }
void set_disabled(bool disabled) { m_disabled = disabled; }
private:
HTMLSelectedContentElement(DOM::Document&, DOM::QualifiedName);
virtual void initialize(JS::Realm&) override;
virtual void post_connection() override;
virtual void removed_from(DOM::Node* old_parent, DOM::Node& old_root) override;
// https://html.spec.whatwg.org/multipage/form-elements.html#selectedcontent-disabled
bool m_disabled { false };
};
}