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LibWeb: Make namespace attributes writable and configurable by default

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This matches the prototype attributes.

Used by https://chatgpt.com/, where it runs this code:
```js
CSS.supports('animation-timeline: --works')
```
If this returns false, it will attempt to polyfill Animation Timeline
and override CSS.supports to support Animation Timeline properties.
This commit is contained in:
Luke Wilde 2025-02-06 19:45:52 +00:00 • committed by Andreas Kling
commit f1801fb1d2
Notes: github-actions[bot] 2025-02-07 14:37:03 +00:00
3 changed files with 102 additions and 2 deletions
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4
Meta/Lagom/Tools/CodeGenerators/LibWeb/BindingsGenerator/IDLGenerators.cpp
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@ -1,7 +1,7 @@
/* /*
* Copyright (c) 2020-2023, Andreas Kling <andreas@ladybird.org> * Copyright (c) 2020-2023, Andreas Kling <andreas@ladybird.org>
* Copyright (c) 2021-2023, Linus Groh <linusg@serenityos.org> * Copyright (c) 2021-2023, Linus Groh <linusg@serenityos.org>
* Copyright (c) 2021-2023, Luke Wilde <lukew@serenityos.org> * Copyright (c) 2021-2025, Luke Wilde <luke@ladybird.org>
* Copyright (c) 2022, Ali Mohammad Pur <mpfard@serenityos.org> * Copyright (c) 2022, Ali Mohammad Pur <mpfard@serenityos.org>
* Copyright (c) 2023-2024, Kenneth Myhra <kennethmyhra@serenityos.org> * Copyright (c) 2023-2024, Kenneth Myhra <kennethmyhra@serenityos.org>
* Copyright (c) 2023-2025, Shannon Booth <shannon@serenityos.org> * Copyright (c) 2023-2025, Shannon Booth <shannon@serenityos.org>
@ -4523,7 +4523,7 @@ GC_DEFINE_ALLOCATOR(@namespace_class@);
void @namespace_class@::initialize(JS::Realm& realm) void @namespace_class@::initialize(JS::Realm& realm)
{ {
[[maybe_unused]] auto& vm = this->vm(); [[maybe_unused]] auto& vm = this->vm();
[[maybe_unused]] u8 default_attributes = JS::Attribute::Enumerable; [[maybe_unused]] u8 default_attributes = JS::Attribute::Enumerable | JS::Attribute::Configurable | JS::Attribute::Writable;
Base::initialize(realm); Base::initialize(realm);

62
Tests/LibWeb/Text/expected/namespace-objects-default-property-attributes.txt Normal file
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@ -0,0 +1,62 @@
== CSS property descriptors
supports writable: true
supports configurable: true
supports enumerable: true
supports value before: function supports() { [native code] }
supports value after: replaced
escape writable: true
escape configurable: true
escape enumerable: true
escape value before: function escape() { [native code] }
escape value after: replaced
== WebAssembly property descriptors
compile writable: true
compile configurable: true
compile enumerable: true
compile value before: function compile() { [native code] }
compile value after: replaced
instantiate writable: true
instantiate configurable: true
instantiate enumerable: true
instantiate value before: function instantiate() { [native code] }
instantiate value after: replaced
compileStreaming writable: true
compileStreaming configurable: true
compileStreaming enumerable: true
compileStreaming value before: function compileStreaming() { [native code] }
compileStreaming value after: replaced
instantiateStreaming writable: true
instantiateStreaming configurable: true
instantiateStreaming enumerable: true
instantiateStreaming value before: function instantiateStreaming() { [native code] }
instantiateStreaming value after: replaced
validate writable: true
validate configurable: true
validate enumerable: true
validate value before: function validate() { [native code] }
validate value after: replaced
Global writable: true
Global configurable: true
Global enumerable: false
Global value before: function Global() { [native code] }
Global value after: replaced
Instance writable: true
Instance configurable: true
Instance enumerable: false
Instance value before: function Instance() { [native code] }
Instance value after: replaced
Memory writable: true
Memory configurable: true
Memory enumerable: false
Memory value before: function Memory() { [native code] }
Memory value after: replaced
Module writable: true
Module configurable: true
Module enumerable: false
Module value before: function Module() { [native code] }
Module value after: replaced
Table writable: true
Table configurable: true
Table enumerable: false
Table value before: function Table() { [native code] }
Table value after: replaced

38
Tests/LibWeb/Text/input/namespace-objects-default-property-attributes.html Normal file
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@ -0,0 +1,38 @@
<!DOCTYPE html>
<script src="include.js"></script>
<script>
test(() => {
"use strict";
println("== CSS property descriptors");
const cssNamespaceDescriptors = Object.getOwnPropertyDescriptors(CSS);
const cssNamespaceKeys = Object.keys(cssNamespaceDescriptors);
for (const key of cssNamespaceKeys) {
const descriptor = cssNamespaceDescriptors[key];
println(`${key} writable: ${descriptor.writable}`);
println(`${key} configurable: ${descriptor.configurable}`);
println(`${key} enumerable: ${descriptor.enumerable}`);
if (descriptor.writable) {
println(`${key} value before: ${CSS[key]}`);
CSS[key] = "replaced";
println(`${key} value after: ${CSS[key]}`);
}
}
println("== WebAssembly property descriptors");
const wasmNamespaceDescriptors = Object.getOwnPropertyDescriptors(WebAssembly);
const wasmNamespaceKeys = Object.keys(wasmNamespaceDescriptors);
for (const key of wasmNamespaceKeys) {
const descriptor = wasmNamespaceDescriptors[key];
println(`${key} writable: ${descriptor.writable}`);
println(`${key} configurable: ${descriptor.configurable}`);
println(`${key} enumerable: ${descriptor.enumerable}`);
if (descriptor.writable) {
println(`${key} value before: ${WebAssembly[key]}`);
WebAssembly[key] = "replaced";
println(`${key} value after: ${WebAssembly[key]}`);
}
}
});
</script>