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LibWeb: Implement @supports selector(.foo)

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This is defined in
https://www.w3.org/TR/css-conditional-4/#at-supports-ext which just
became a CR. :^)
This commit is contained in:
Sam Atkins 2022-02-19 17:22:05 +00:00 • committed by Andreas Kling
parent c50ea8c1dd
commit 7880718fa8
4 changed files with 93 additions and 9 deletions
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16
Userland/Libraries/LibWeb/CSS/Supports.h
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2021, Sam Atkins <atkinssj@serenityos.org>
* Copyright (c) 2021-2022, Sam Atkins <atkinssj@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -16,16 +16,26 @@
namespace Web::CSS {
// https://www.w3.org/TR/css-conditional-3/#at-supports
// https://www.w3.org/TR/css-conditional-4/#at-supports
class Supports final : public RefCounted<Supports> {
friend class Parser;
public:
struct Feature {
struct Declaration {
String declaration;
bool evaluate() const;
};
struct Selector {
String selector;
bool evaluate() const;
};
struct Feature {
Variant<Declaration, Selector> value;
bool evaluate() const;
};
struct Condition;
struct InParens {
Variant<NonnullOwnPtr<Condition>, Feature, GeneralEnclosed> value;